JP6236277B2 - Plastic lens molding adhesive tape and plastic lens molding product molding method - Google Patents

Description

  The present invention relates to a pressure-sensitive adhesive tape for molding a plastic lens and a method for molding the plastic lens used when manufacturing a standard molded product having the same thickness and curvature as a final product as a plastic lens such as a plastic eyeglass lens or an optical lens. About.

  As a conventional method for producing a plastic lens, there is known a method of molding by a casting polymerization method using a pair of glass molds (molds) and an adhesive tape for sealing (for example, Patent Document 1 and Patent Document 2). reference). In this method, a pair of glass molds are arranged to face each other at a predetermined interval. Next, a pressure-sensitive adhesive tape is attached along the circumferential direction over the entire circumference of the pair of glass molds to produce a polymerization cell. Thereby, the space between the glass molds is sealed with the adhesive tape. Next, a resin injection nozzle is inserted into the adhesive tape, and a liquid resin (polymerizable monomer) is injected and filled into the space between the glass molds. Thereafter, the resin is polymerized and cured by heating or light irradiation to obtain a plastic lens molded article.

  In the molding of a resin (polymerizable monomer), as the temperature of the resin rises, thermal expansion first occurs and the volume increases (expands). At this time, if a pressure-sensitive adhesive tape with a cohesive force greater than necessary is used, the adhesive volume between the pressure-sensitive adhesive tape and the mold and the pressure-sensitive adhesive tape will wrap. A gap is generated in the part where the resin flows, and resin leakage occurs. Therefore, there is a possibility that chipping may occur in the molded lens. For this reason, as described above, a method for molding a plastic lens using a sealing adhesive tape having a cohesive force larger than necessary is not suitable for the production of a standard molded product. Patent Documents 2 and 3 propose techniques for suppressing the occurrence of chipping, white turbidity, bubbles and the like in the plastic lens as described above. However, even in these techniques, depending on the type of lens resin (polymerizable monomer) and lens molding conditions, there are those that cannot sufficiently suppress the occurrence of chipping due to resin leakage due to the adhesive. there were.

  When the temperature of the resin is further increased, polymerization and curing is started, and this time, the volume is reduced by curing shrinkage. At this time, as the pressure-sensitive adhesive tape for sealing, if the pressure-sensitive adhesive has a cohesive force smaller than necessary, the pressure-sensitive adhesive layer (not shown) of the pressure-sensitive adhesive tape 100 becomes the outer periphery of the mold 30 as shown in FIG. The surface cannot be sufficiently fixed, and the mold 30 is displaced in the shrinking direction of the resin. For this reason, the space | interval of a pair of mold 30 becomes narrow rather than the time of resin injection | pouring. Therefore, there is a possibility that the thickness of the molded lens becomes thinner than the desired thickness (thickness change). As described above, the method of molding a plastic lens using an adhesive tape having a smaller cohesive force than necessary as a sealing pressure-sensitive adhesive tape is not suitable for the production of standard molded products. For these reasons, the plastic lens molding method described above is greatly affected by the adhesive properties of the adhesive tape used, and in particular the same thickness as the final product as a plastic lens such as a plastic spectacle lens or optical lens. In addition, it has been difficult to stably produce a standard molded product having curvature and curvature with a high yield.

  Further, after completion of the resin curing reaction, the polymerization cell is cooled to about 20 ° C. to 50 ° C., and the molded plastic lens is removed from the mold 30. At this time, if the cohesive force of the pressure-sensitive adhesive tape in this temperature range is smaller than necessary, the adhesiveness between the pressure-sensitive adhesive tape and the mold increases, and the pressure-sensitive adhesive of the pressure-sensitive adhesive tape remains on the mold, and the used mold is washed separately. However, there is a possibility that a processing step for regeneration is required. For these reasons, depending on the type of mold and lens molding conditions, there are some that cannot sufficiently suppress the occurrence of adhesive residue on the mold due to the adhesive.

  Since the adhesive for the plastic lens molding adhesive tape as described above is required to have flexibility and excellent solvent resistance, a silicone adhesive is often used rather than an acrylic adhesive or a rubber adhesive. This silicone-based pressure-sensitive adhesive is roughly classified into two types depending on the curing mechanism. One of them is a silicone pressure-sensitive adhesive that cures by radical reaction using an organic peroxide as a curing agent, and the other one is an alkenyl group of polyorganosiloxane gum and a polyorganohydrogensiloxane (crosslinking agent). ) Is a silicone-based pressure-sensitive adhesive that cures by an addition reaction with hydrogen directly bonded to silicon atoms.

  In radical reaction type silicone pressure sensitive adhesive (peroxide reaction type silicone pressure sensitive adhesive), the crosslinking density is adjusted by the amount of organic peroxide that is an effective curing agent for this reaction. Temperature dependence is large, which becomes an unstable factor, and it is difficult to stably obtain a desired crosslinking density. On the other hand, in addition-reaction type silicone pressure-sensitive adhesives, the crosslinking density is adjusted by the amount of the crosslinking agent. However, since the reaction rate is slower than the radical reaction, the crosslinking density varies greatly depending on the content of alkenyl groups, and depending on the time. There is a possibility that the crosslinking density increases, and it is difficult to stably obtain a desired crosslinking density.

  In addition, low molecular weight siloxane (mainly 3-20 mer cyclic or linear dimethylpolysiloxane) is an impurity in silicone adhesives that are commonly used as adhesives for plastic lens molding adhesive tapes. However, during the polymerization of the lens monomer resin, these impurities are eluted from the pressure-sensitive adhesive layer and mixed into the resin. There was a risk of such cloudiness.

  As described above, a standard molded product having the same thickness and curvature as the final product as a plastic lens is accurately molded, and the outer peripheral surface of the molded standard molded product is chipped or whitened, and adheres to the mold. When the purpose is to provide an adhesive tape for molding plastic lenses and a molding method for plastic lenses that can suppress the generation of residual chemicals and can be used stably even after long-term storage, The proper design and molding method of the silicone-based pressure-sensitive adhesive to obtain has not yet been fully elucidated and studied.

JP-A-1-257016 JP 2003-193004 A JP 2001-316645 A

  Therefore, the present invention has been made in view of the above-described problems, and enables a standard molded product having the same thickness and curvature as the final product as a plastic lens to be accurately molded, and further, Plastic lens molding pressure-sensitive adhesive tape and plastic lens that can suppress chipping or whitening of the outer peripheral surface of the molded standard molded product and the occurrence of adhesive residue on the mold and can be used stably even after long-term storage An object of the present invention is to provide a molding method.

In order to solve the above-described problems and achieve the object, an aspect of the present invention is formed between a pair of molds attached along the outer peripheral surface of a pair of molds arranged to face each other at a predetermined interval. In a pressure-sensitive adhesive tape for molding plastic lenses used to seal a space and form a cavity filled with a polymerizable monomer for a plastic lens, the pressure-sensitive adhesive tape is composed of a belt-shaped base material and an outer peripheral surface of the mold. The pressure-sensitive adhesive layer is composed of a pressure-sensitive adhesive mainly composed of a silicone pressure-sensitive adhesive. (1) The silicone pressure-sensitive adhesive contains a silicone pressure-sensitive adhesive containing alkenyl groups and an alkenyl group. The composition ratio of the polyorganosiloxane gum (G) and the silicone range (R) in the silicone adhesive is (2) Polyorgan (4) Polyorganosiloxane gum (G) containing 36 to 44 parts by weight of nosiloxane gum (G) and (3) 56 to 64 parts by weight of silicone resin (R). The amount of the polyorganosiloxane gum containing alkenyl groups contained is 18 to 29 parts by weight based on the total amount of the polyorganosiloxane gum, and (5) the crosslinking agent and the catalyst are based on the silicone adhesive containing alkenyl groups. It is comprised with the adhesive mix | blended so that it may become 0.5-1.5 weight part, (6) 70 degreeC retention strength of an adhesive tape is 50 minutes or more and 500 minutes or less, (7) Adhesive strength is 2 It is 0.0N / 10mm or more and 6.0N / 10mm or less.

  As said aspect, it is that the total amount of the 3-10 mer low molecular siloxane (cyclic or linear polyorganosiloxane) contained in the silicone adhesive which is a main component of an adhesive layer is 165 microgram / g or less. preferable.

(Retention force after storage)
As said aspect, it is preferable that the retention strength in 70 degreeC after leaving for 3 months at 40 degreeC according to JISZ0237 (ISO29862) of an adhesive tape is 50 minutes or more and 500 minutes or less. By maintaining the holding power at 70 ° C. after standing at 40 ° C. for 3 months in the same range as the initial 70 ° C. holding power of 50 minutes or more and 500 minutes or less, it is sufficient for curing shrinkage of the monomer resin of the lens even after storage. Secure fixing force and followability to thermal expansion of the lens monomer can be ensured.

  As said aspect, dimethylpolysiloxane content of the trimer or more and 20-mer or less contained in the silicone pressure-sensitive adhesive which is the main component of the pressure-sensitive adhesive layer is 4850 μg or less per 1 g of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer. Is preferred.

  As said aspect, dimethylpolysiloxane content of the trimer contained in the silicone adhesive which is a main component of an adhesive layer and 10-mer or less is 165 micrograms or less per 1 g of adhesive which comprises this adhesive layer. It is preferable.

  As said aspect, dimethylpolysiloxane content of the trimer contained in the silicone adhesive which is a main component of an adhesive layer and 10-mer or less is 50 micrograms or less per 1 g of adhesive which comprises this adhesive layer. More preferably.

  Another aspect of the present invention is a method for molding a plastic lens molded article using the above-mentioned adhesive tape for molding a plastic lens, wherein a pair of molds are arranged to face each other at a predetermined interval, and an outer periphery of the pair of molds A plastic lens molding adhesive tape is applied to the surface, the space formed between the pair of molds is sealed, and a cavity forming step for forming a cavity filled with the polymerizable monomer, and the polymerizable monomer in the cavity And a monomer filling step for filling, and a polymerization step for polymerizing the polymerizable monomer filled in the cavity.

  According to the method for molding a plastic lens molding adhesive tape and a plastic lens molding product according to the present invention, it is possible to accurately mold a standard molding product having the same thickness and curvature as the final product as a plastic lens. Further, chipping or whitening of the outer peripheral surface of the molded standard molded product, and generation of adhesive residue on the mold can be suppressed. In addition, since the change in the cohesive force of the pressure-sensitive adhesive during storage over time is small, even when a pressure-sensitive adhesive tape after long-term storage is used, a plastic lens can be accurately molded as described above.

FIG. 1 is a cross-sectional view of an adhesive tape for molding a plastic lens according to an embodiment of the present invention. FIG. 2 is an explanatory view showing a molding method of a plastic lens molded product according to the embodiment of the present invention. FIG. 3 is a diagram showing the relationship between the cohesive force, the resin temperature, and the resin volume of the plastic lens molding adhesive tape. FIG. 4 is an explanatory view showing the variation of the thickness of the molded product accompanying the monomer shrinkage at the time of molding the plastic lens.

  Hereinafter, details of a molding method of a plastic lens molding adhesive tape (hereinafter also referred to as an adhesive tape) and a plastic lens molded product (finish lens) according to an embodiment of the present invention will be described with reference to the drawings. However, it should be noted that the drawings are schematic, and the dimensions and ratios of the members are different from actual ones. Moreover, the part from which the relationship and ratio of a mutual dimension differ also in between drawings is contained.

[Configuration of adhesive tape for molding plastic lenses]
FIG. 1 is a cross-sectional view showing a state in which a plastic lens molding pressure-sensitive adhesive tape according to the present embodiment is cut in the width direction, and FIG. 2 illustrates a method for molding a plastic lens molded product according to the present embodiment. FIG. The plastic lens molded product is a molded product having the thickness and curvature of a plastic lens as a final product in a molded state, and refers to a semi-finished product that is subjected to final processing to become a plastic lens.

  As shown in FIG. 2, the adhesive tape 1 for molding plastic lenses according to the present embodiment is attached along the outer peripheral surface of a pair of molds 30 arranged to face each other at a predetermined interval. The space formed between 30 is sealed and used to form a cavity C filled with the polymerizable monomer of the plastic lens. As shown in FIG. 1, a plastic lens molding pressure-sensitive adhesive tape 1 according to the present embodiment includes a strip-shaped tape base material 2, and a pressure-sensitive adhesive layer 3 provided on almost the entire surface of one side of the tape base material 2, have.

The pressure-sensitive adhesive layer 3 is composed of a pressure-sensitive adhesive mainly composed of a silicone pressure-sensitive adhesive. (1) The silicone pressure-sensitive adhesive includes a silicone pressure-sensitive adhesive containing an alkenyl group and a silicone pressure-sensitive adhesive not containing an alkenyl group. (2) The compounding ratio of the silicone pressure-sensitive adhesive containing alkenyl groups is 50 to 70 parts by weight, whereas (3) the compounding ratio of the silicone pressure-sensitive adhesive not containing alkenyl groups is 30 to 50 parts by weight. . (4) The crosslinking agent and the catalyst are blended so as to be 0.5 to 1.5 parts by weight based on (2) the silicone pressure-sensitive adhesive containing an alkenyl group. The composition ratio of the polyorganosiloxane gum (G) and the silicone resin (R) in the silicone pressure-sensitive adhesive is 36 to 44 parts by weight of (5) polyorganosiloxane gum (G). ) The silicone resin (R) is blended so as to be 56 to 64 parts by weight.
That is, (1) the silicone pressure-sensitive adhesive includes a silicone pressure-sensitive adhesive containing an alkenyl group and a silicone pressure-sensitive adhesive not containing an alkenyl group, and the composition of the polyorganosiloxane gum (G) and the silicone range (R) in the silicone pressure-sensitive adhesive. The pressure-sensitive adhesive was formulated so that the ratio was (2) 36 to 44 parts by weight of the polyorganosiloxane gum (G), and (3) 56 to 64 parts by weight of the silicone resin (R), (4) The amount of the polyorganosiloxane gum containing an alkenyl group contained in the polyorganosiloxane gum (G) is 18 to 29 parts by weight based on the total amount of the polyorganosiloxane gum, and (5) the alkenyl group is added to the crosslinking agent and catalyst. It is comprised with the adhesive mix | blended so that it might become 0.5-1.5 weight part with respect to the said silicone adhesive contained. .
The pressure-sensitive adhesive has (7) 70 ° C. holding power of the pressure-sensitive adhesive tape of 50 minutes or more and 500 minutes or less, and (8) pressure-sensitive adhesive strength of 2.0 N / 10 mm or more and 6.0 N / 10 mm or less. It is characterized by.

  Generally, a silicone adhesive consists of a polyorganosiloxane gum (G) and a silicone resin (R) that is a tackifier. The polyorganosiloxane gum (G) is a high molecular weight oil having a skeleton structure composed of D units. Silicone resin (R) is a low molecular weight resin in which a skeleton structure forms a three-dimensional crosslinked structure composed of M units and Q units. Moreover, the presence or absence of the alkenyl group in a silicone adhesive is as follows. That is, the alkenyl group is on the side chain of the polyorganosiloxane gum (G), and becomes a crosslinking point that reacts with the hydrosilyl group of the crosslinking agent described later. For this reason, the silicone adhesive which does not contain an alkenyl group is a silicone adhesive which does not have a crosslinking point in polyorganosiloxane gum (G). Therefore, the silicone pressure-sensitive adhesive containing an alkenyl group is a silicone pressure-sensitive adhesive comprising a polyorganosiloxane gum (G) having a crosslinking point and a silicone resin (R). And the silicone adhesive which does not contain an alkenyl group is a silicone adhesive which consists of polyorganosiloxane gum (G) and silicone resin (R) which do not have a crosslinking point.

[Plastic lens molding method]
Next, a method for molding a plastic lens molded product using such a plastic lens molding adhesive tape 1 will be described. The method for molding a plastic lens molded article according to the present embodiment includes a cavity forming step, a monomer filling step, and a polymerization step. The molding method of the plastic lens molded article according to the present invention is not limited to these processes, and may include other processes as appropriate according to the purpose.

(Cavity formation process)
First, as shown in FIG. 2, for example, a pair of molds 30, 30 formed of glass having a substantially disk shape are disposed to face each other with a predetermined interval (an interval corresponding to the thickness of a plastic lens molded product). Thereafter, the adhesive tape 1 is attached to the outer peripheral surfaces of the pair of molds 30 and 30 made of glass so as to be wound along the circumferential direction. As a result, the pair of molds 30, 30 seals the space formed between the pair of molds 30, 30 while maintaining the above interval. As shown in FIG. 2, the molds 30 and 30 are thereby connected in a substantially parallel manner, and a flat or cylindrical cavity C is defined between the molds 30, thereby producing a polymerization cell.

(Monomer filling process)
Then, as shown in FIG. 2, one end of the adhesive tape 1 is peeled into the cavity C of the polymerization cell to open a gap, and a nozzle (not shown) is inserted into the cavity C from the gap. Then, after filling and filling a liquid resin (polymerizable monomer) into the cavity C from the nozzle, the gap is closed again with the adhesive tape 1. Here, as the resin (polymerizable monomer), a mixture of m-xylylene diisocyanate and pentaerythritol tetrakis mercaptopropionate, or a mixture of m-xylylene diisocyanate and bis (mercaptoethyl) trithioglycerin. However, it is not particularly limited to these.

(Polymerization process)
Thereafter, the resin in the cavity is heated and polymerized to be cured. After the resin (polymerizable monomer) is sufficiently cured by the polymerization step, the pressure-sensitive adhesive tape 1 is completely peeled off and the molds 30 and 30 are removed. In this way, a plastic lens molded product is obtained.

  Next, the plastic lens molding pressure-sensitive adhesive tape 1 according to the present embodiment, the mold 30 used in the molding method of the plastic lens molded product, and the resin (polymerizable monomer) used as the raw material of the plastic lens will be described in detail.

(mold)
In the present embodiment, the mold 30 is made of disk-shaped glass (silicon dioxide) formed so that the surfaces facing each other have a desired curvature on both surfaces of the plastic lens. In addition, as the mold 30, a metal or other material may be used.

(resin)
The resin (polymerizable monomer) that is a raw material for the plastic lens is not particularly limited, but conventionally known materials are used in the case of a lens. For example, when an eyeglass lens having an ultrahigh refractive index (refractive index Ne: ≧ 1.65) is obtained, an episulfide resin (MR-174 manufactured by Mitsui Chemicals, IU-20 manufactured by Mitsubishi Gas Chemical Co., Ltd.) or thiol is used. A monomer of urethane resin (MR-7 manufactured by Mitsui Chemicals, Inc.) is used.

  Moreover, when obtaining a spectacle lens having a high refractive index (1.58 ≦ Ne <1.65), a thiourethane resin (MR-6 manufactured by Mitsui Chemicals, MR-8 manufactured by Mitsui Chemicals), polyester methacrylate (Tokuyama TS-26), polycarbonate (Teijin Chemicals Corporation Panlite) monomers, etc. are used. When obtaining a spectacle lens having a medium refractive index (1.55 ≦ Ne <1.58), urethane methacrylate (K-23 manufactured by Kureha Co., Ltd.), epoxy methacrylate (MCR-50 manufactured by Mitsubishi Rayon Co., Ltd.), diallyl Monomers such as carbonate (HIRI manufactured by PPG Industries) and diallyl phthalate resin (NK-55 manufactured by NOF Corporation) are used.

  Furthermore, when obtaining a spectacle lens having a low refractive index (Ne: <1.55), urethane resin (TRIVEX manufactured by PPG Industries), urethane methacrylate (MCR-10 manufactured by Mitsubishi Rayon Co., Ltd.), methacrylate (Kureha Corporation) Monomers such as K-55), allyl diglycol carbonate (CR-39 manufactured by PPG Industries), diallyl carbonate (CR-607 manufactured by PPG Industries), and polymethyl methacrylate (methyl polymethacrylate) can be used.

  Next, the base material 2, the pressure-sensitive adhesive layer 3, and the silicone pressure-sensitive adhesive that is a raw material of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive tape 1 according to the present embodiment will be described.

(Tape substrate)
The material of the tape substrate 2 is not particularly limited, but a material mainly composed of polyethylene terephthalate is optimal. However, the material of the tape substrate 2 is not limited to polyethylene terephthalate, and other materials can also be used. Specific examples of the material of the tape substrate 2 include metal foil such as stainless steel and soft aluminum, polybutylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, biaxially oriented polypropylene, polyimide, aramid, polycycloolefin, fluorine. A resin film such as a resin can be used. In addition, as a base material with a reduced water vapor transmission rate, a composite film obtained by laminating an aluminum foil and a resin film, a film in which a metal oxide thin film such as alumina or silicon dioxide is formed on the surface of the resin film, or a resin film It is also possible to use a composite film or the like laminated.

  For example, when polyethylene terephthalate is used as the tape substrate 2, the thickness is preferably in the range of 20 μm to 75 μm. If it is less than 20 μm, the rigidity of the base material 2 is low, and therefore there is a possibility that the interval between the two molds 30, 30 cannot be maintained. Further, the resin (polymerizable monomer) may not resist the expanding force and may crack, cut, etc., and air may enter the cavity C. On the other hand, if it exceeds 75 μm, the base material 2 has a high rigidity, so that the stretchability may be lowered. Further, a gap is generated in the wrap portion of the plastic lens molding pressure-sensitive adhesive tape 1, and there is a possibility that liquid leakage of the resin (polymerizable monomer) may occur.

(Adhesive layer)
The pressure-sensitive adhesive layer 3 is composed of a pressure-sensitive adhesive mainly composed of a peroxide curable silicone pressure-sensitive adhesive or an addition reaction type silicone pressure-sensitive adhesive.

<Peroxide curable silicone adhesive>
The peroxide curable silicone pressure-sensitive adhesive is not particularly limited. For example, KR100, KR101-10 manufactured by Shin-Etsu Chemical Co., Ltd., YR3340, YR3286, PSA610- manufactured by Momentive Performance Materials. SM, XR37-B6722 and SH4280 manufactured by Toray Dow Corning Co., Ltd. may be mentioned.

<Crosslinking agent>
An organic peroxide-based crosslinking agent is used for the peroxide-curable silicone pressure-sensitive adhesive. An effective crosslinking agent for the pressure-sensitive adhesive is not particularly limited. Examples of the organic peroxide include benzoyl peroxide, dicumyl peroxide, and 2,5-dimethyl-2,5-di (t -Butylperoxy) hexane, 1,1'-di-t-butylperoxy-3,3,5-trimethylenecyclohexane, 1,3-di- (t-butylperoxy) -diisopropylbenzene, and the like.

<Addition reaction type silicone adhesive>
Although it does not specifically limit as an addition reaction type silicone adhesive, For example, Shin-Etsu Chemical Co., Ltd. KR3700, KR3701, X-40-3237-1, X-40-3240, X-40-3291 -1, X-40-3229, X-40-3270, X-40-3306, TSR1512, TSR1516, XR37-B9204 manufactured by Momentive Performance Materials, SD4584 manufactured by Toray Dow Corning Co., Ltd. SD4585, SD4586, SD4587, SD4560, SD4570, SD4600PFC, SD4593, DC7651ADHESIVE, etc. are mentioned.

<Crosslinking agent>
In the addition reaction type silicone pressure-sensitive adhesive, polyorganohydrogensiloxane containing a hydrosilyl group at the terminal or side chain is used as a crosslinking agent. Although the effective crosslinking agent with respect to this adhesive is not specifically limited, For example, X-92-122 by Shin-Etsu Chemical Co., Ltd. and BY24-741 by Toray Dow Corning Co., Ltd. are mentioned.

<Catalyst>
For the addition reaction type silicone pressure-sensitive adhesive, a catalyst such as a reaction product of chloroplatinic acid or the like and a vinyl group-containing siloxane is used. An effective catalyst for the pressure-sensitive adhesive is not particularly limited, and examples thereof include CAT-PL-50T manufactured by Shin-Etsu Chemical Co., Ltd. and SRX-212Cat, NC-25 manufactured by Toray Dow Corning Co., Ltd.

<Reaction control agent>
For the addition reaction type silicone pressure-sensitive adhesive, a reaction control agent such as 1,3-divinyldisiloxane is used in order to suppress the rapid progress of the reaction. An effective reaction control agent for the pressure-sensitive adhesive is not particularly limited, and examples thereof include CAT-PLR-2 manufactured by Shin-Etsu Chemical Co., Ltd. and BY24-808 manufactured by Toray Dow Corning Co., Ltd.

<Lack of lens>
As an aspect of suppressing the occurrence of lens chipping, the pressure-sensitive adhesive layer comprises maintaining the state in which the pressure-sensitive adhesive layer can follow the outer peripheral surface of the mold during thermal expansion of the polymerizable monomer below the polymerization reaction start temperature. Specifically, it is necessary to set the time until dropping in measuring the holding force at 70 ° C. according to JISZ 0237 (ISO 29862) to 500 minutes or less. When the drop time of the 70 ° C. holding force exceeds 500 minutes, the followability to the thermal expansion of the monomer resin of the lens is poor, and a gap is generated on the adhesive surface between the adhesive tape 1 and the mold 30 and the wrap portion between the adhesive tapes 1, This is because liquid leakage of the resin occurs, and as a result, the lens may be chipped.

<Adhesive residue>
As an aspect for suppressing the generation of adhesive residue, the pressure-sensitive adhesive layer 3 needs to have a state in which the pressure-sensitive adhesive layer 3 does not remain in the mold 30 after polymerization cooling. Specifically, JISZ 0237 It is preferable that the adhesive strength using an adherend according to (ISO 29862) as a glass plate is 6.0 N / 10 mm or less. If the adhesive strength to the glass plate exceeds 6.0 N / 10 mm, the adhesiveness between the adhesive layer 3 and the mold 30 exceeds the cohesive force of the adhesive layer 3, and as a result, the adhesive layer 3 cohesively breaks down, and the mold 30 This is because there is a risk that glue may remain on the surface.

<Tape peeling>
As an aspect of suppressing tape peeling, the pressure-sensitive adhesive layer 3 preferably has an adhesive strength of 2.0 N / 10 mm or more with an adherend as a glass plate. When the adhesive strength to this glass plate is less than 2.0 N / 10 mm, it is impossible to follow the thermal stress (expansion and contraction) of the monomer resin of the lens, and the tape is peeled off from the mold, making it impossible to mold the lens. Because there is a fear.

<Change thickness>
As an aspect for suppressing the thickness change, the pressure-sensitive adhesive layer 3 needs to have a state in which the outer peripheral surface of the mold is held on the surface of the pressure-sensitive adhesive layer when the polymerizable monomer is cured and contracted at the polymerization reaction start temperature or higher. Yes, specifically, it is necessary to set the time until dropping in the measurement of holding force at 70 ° C. according to JISZ 0237 (ISO 29862) to 50 minutes or more. When the pressure-sensitive adhesive layer 3 has a holding power of 70 ° C. for less than 50 minutes, the lens does not have sufficient fixing force against the curing and shrinkage of the monomer resin, and the distance between the molds is shifted. This is because there is a risk of change.

  Therefore, in order to suppress the occurrence of lens chipping, adhesive residue, and thickness change, the pressure-sensitive adhesive layer 3 needs to have a holding power drop time of at least 50 to 500 minutes at 70 ° C., and glass. It is necessary to set the adhesive strength to the plate to 2.0 to 6.0 N / 10 mm.

<Whitening>
In addition, the pressure-sensitive adhesive is subjected to a high-temperature heat treatment at 160 ° C. to 200 ° C., for example, in the pressure-sensitive adhesive drying / curing process step, so that the total amount of tri- to 10-mer low molecular siloxane in 1 g of the pressure-sensitive adhesive is 165 μg. / G or less, or the total amount of low molecular siloxanes of 3 to 20 mer is preferably 4850 μg / g or less. If the total amount of the low molecular siloxane of 3 to 10 mer exceeds 165 μg / g, or the total amount of the low molecular siloxane of 3 to 20 mer exceeds 4850 μg / g, the outer periphery of the lens may be whitened as a result. There is. It is preferable that the amount of low molecular siloxane of 3 to 10 mer or 3 to 20 mer is small, and that of low molecular siloxane of 3 to 10 mer is most preferably 0 μg / g. The heat treatment temperature is not particularly limited, but it is preferable to perform heat treatment at 160 to 200 ° C. as a guide. If heat treatment is performed at a temperature exceeding 200 ° C for a long time, the main chain of the polyorganosiloxane may be cleaved and low molecular siloxane may increase. If heat treatment is performed at a temperature below 160 ° C, the temperature is too low, Since it becomes difficult to evaporate and the remaining area increases, as a result, whitening of the outer periphery of the lens may occur. Therefore, it is necessary to appropriately adjust the heat treatment conditions (temperature and time) with caution.

<Stability>
In order to produce a pressure sensitive adhesive such as the pressure sensitive adhesive layer 3, it is necessary to reduce the cohesive force of the pressure sensitive adhesive itself. As this method, there is a method of reducing the amount of the crosslinking agent or catalyst added to the pressure-sensitive adhesive. However, in this method, the crosslinking density of the pressure-sensitive adhesive is affected by the amount of reactive groups in the pressure-sensitive adhesive and the ambient temperature. In addition, it is difficult to stably obtain a desired holding force, and the addition reaction type silicone pressure-sensitive adhesive having a slow reaction rate shows a remarkable increase in holding power due to storage over time, and the pressure-sensitive adhesive has poor stability. The problem of becoming is not completely resolved. In order to improve this stability and to produce an adhesive having high followability like the adhesive layer, for example, a method of reducing the number of alkenyl groups in the entire silicone adhesive, that is, not containing an alkenyl group A method of reducing the crosslinking density by adding a predetermined amount of silicone adhesive, and reducing the content of silicone resin (MQ resin) with a low molecular weight but three-dimensional crosslinked structure, Examples include a method of shifting the loss tangent (tan δ) of the dynamic viscoelasticity to the low temperature side and reducing the holding force, but are not particularly limited to these methods.

  In the method of reducing the number of alkenyl groups in the entire silicone-based pressure-sensitive adhesive, that is, the method of decreasing the crosslinking density by adding a predetermined amount of a silicone pressure-sensitive adhesive not containing alkenyl groups, the pressure-sensitive adhesive layer 3 contains at least alkenyl 50 to 70 parts by weight of a silicone adhesive containing a group, 30 to 50 parts by weight of a silicone adhesive not containing an alkenyl group, and 0.5 to 0.5 parts of a crosslinking agent and a catalyst with respect to the silicone adhesive containing an alkenyl group. It is preferable to use a pressure-sensitive adhesive that is blended so as to be ˜1.5 parts by weight.

  If the content of the silicone pressure-sensitive adhesive not containing an alkenyl group is less than 30 parts by weight, the holding power increases, the above characteristics cannot be satisfied, and as a result, the lens may be chipped. In addition, when the content of the silicone pressure-sensitive adhesive not containing alkenyl groups exceeds 50 parts by weight, the holding power is reduced and the above characteristics cannot be satisfied. As a result, adhesive residue of the pressure-sensitive adhesive and lens thickness change are caused. May occur. On the other hand, when the silicone pressure-sensitive adhesive containing an alkenyl group is less than 50 parts by weight, the holding power is lowered, the above characteristics cannot be satisfied, and as a result, adhesive residue or lens thickness change may occur. On the other hand, when the content of the silicone pressure-sensitive adhesive containing an alkenyl group is 70 parts by weight or more, the holding power increases and the above characteristics cannot be satisfied, and as a result, the lens may be chipped. Furthermore, when the addition amount of the crosslinking agent and the catalyst exceeds 1.5 parts by weight, unreacted low-molecular components may dissolve into the resin and cause whitening. Moreover, when the addition amount of the crosslinking agent is less than 0.5 parts by weight, the holding power varies greatly depending on the number of reactive groups in the pressure-sensitive adhesive, and the holding power may change with time.

  In addition, the content of the silicone resin (MQ resin) having a low molecular weight but a three-dimensional crosslinked structure is reduced, and the loss tangent (tan δ) of the dynamic viscoelasticity of the entire silicone adhesive is shifted to a low temperature side. When reducing the holding power, the composition ratio of the polyorganosiloxane gum (G) and the silicone resin (R) in the silicone adhesive (mixture of silicone adhesive containing alkenyl groups and silicone adhesive not containing alkenyl groups) However, it is preferable to use a pressure-sensitive adhesive formulated so that the polyorganosiloxane gum is 36 to 44 parts by weight and the silicone resin is 56 to 64 parts by weight.

  When the ratio of the silicone resin in the silicone adhesive is less than 56 parts by weight, the holding power and adhesive strength are lowered, the above characteristics cannot be satisfied, and as a result, the tape may be peeled off and the lens thickness may be changed. On the other hand, when the ratio of the silicone resin exceeds 64 parts by weight, the holding power and the adhesive strength increase, and the above characteristics cannot be satisfied. As a result, adhesive residue or lens chipping may occur. The followability with respect to the thermal expansion of the monomer resin of the lens is poor, a gap is formed on the adhesive surface between the adhesive tape 1 and the mold 30 and the lap portion between the adhesive tapes 1, resin leakage occurs, and the lens is chipped as a result. This is because it may occur.

  By using the silicone adhesive adjusted in this way, there are no problems such as chipping of the lens, thickness change, adhesive residue, etc. during lens molding, and it is possible to suppress changes in holding force, and a stable adhesive. Can be obtained.

  FIG. 3 shows the relationship between the adhesive force of the pressure-sensitive adhesive tape 1, the temperature change of the monomer resin of the lens due to the polymerization reaction, and the volume change of the resin in the molding process of the plastic lens molded product.

  In FIG. 3, the solid line indicates the monomer resin temperature of the lens. The resin temperature is about room temperature before the polymerization reaction, but when the polymerization reaction starts, the temperature of the resin gradually increases due to the heat of reaction, and when the polymerization reaction ends, the heat of reaction disappears and the temperature of the resin gradually increases. Decrease to room temperature. The maximum temperature of the resin due to this polymerization reaction varies depending on the ambient temperature and the type of the resin, but in general, there are many that are about 120 ° C to 130 ° C. The polymerization reaction start temperature varies depending on the type of the monomer resin of the lens to be used. In the present invention, the temperature lower than the polymerization reaction start temperature generally means a temperature range of 40 to 70 ° C. The above generally indicates a temperature range of 60 to 100 ° C.

  In FIG. 3, the alternate long and short dash line indicates the monomer resin volume of the lens. When the resin volume is based on the vicinity of the initial room temperature (about 15 ° C. to 25 ° C.) when the resin (polymerizable monomer) is injected, the temperature of the resin further increases due to heating or light irradiation. From around 0 ° C., the volume gradually increases (thermal expansion). Then, when the temperature exceeds 60 to 70 ° C., the resin volume starts to become smaller than the initial reference volume (curing shrinkage). Thereafter, the volume becomes the lowest when the polymerization reaction is completed and the resin becomes a polymer. The volume shrinkage of the resin due to this polymerization reaction also varies depending on the type of resin, etc., but generally there are many that are about 80 to 98% of the volume of the monomer state.

  In FIG. 3, the broken line indicates the adhesive force. The pressure-sensitive adhesive tape 1 according to the present embodiment exhibits the highest adhesive force and cohesive force near room temperature (about 15 ° C. to 25 ° C.), but has a characteristic that the cohesive force gradually decreases as the temperature rises. Have.

  The monomer resin of the lens filled in the cavity C undergoes thermal expansion (generally 40 ° C. to 70 ° C.) by heating or reaction heat, and the volume increases from the initial reference volume. Thereafter, when the polymerization temperature is reached (generally 60 ° C. to 100 ° C.), the polymerization reaction proceeds and shrinks from the initial reference volume. Conventional pressure-sensitive adhesive tapes with high cohesive force have poor followability to thermal expansion, gaps are formed on the adhesive surface between the pressure-sensitive adhesive tape 1 and the mold 30 and the lap portion between the pressure-sensitive adhesive tapes 1, and the resin leaks, resulting in a lens. Chipping occurs. On the other hand, in the conventional adhesive tape with low cohesive force, as shown in FIG. 4, the fixing force of the adhesive tape 100 to the molds 30, 30 is small. The surface of the pressure-sensitive adhesive layer is moved against the cohesive force, and moves closer to each other, resulting in a change in thickness.

  However, in the pressure-sensitive adhesive tape 1 according to the present embodiment, since the holding power at 70 ° C. is 50 to 500 minutes, in the temperature range of 40 ° C. to 70 ° C. where the thermal expansion of the monomer resin of the lens occurs, the tape No gap is observed on the adhesive surface of the mold and the wrap portion of the tape, so that the occurrence of liquid leakage can be suppressed and the occurrence of lens chipping can be prevented. Further, even in the temperature range of 60 ° C. to 100 ° C. where the resin shrinks and cures, sufficient cohesive force can be obtained to fix the molds 30, 30, and the molds 30, 30 can follow the surface of the pressure-sensitive adhesive layer 3. Without stopping. Thereby, by using the adhesive tape 1 of this Embodiment, it can prevent that the thickness and curvature which are the basic performances of a molded product fluctuate.

  In the case where the holding force at 70 ° C. according to JIS Z 0237 (ISO29862) of the pressure-sensitive adhesive tape 1 of this embodiment is less than 50 minutes, a sufficient fixing force against the curing shrinkage of the monomer resin of the lens cannot be obtained, and the mold 30 , 30 follow the surface of the pressure-sensitive adhesive layer 3 and the distance between the molds is shifted, so that the thickness of the lens after molding may change. On the other hand, when the holding power at 70 ° C. of the pressure-sensitive adhesive tape 1 of this embodiment exceeds 500 minutes, the followability to the thermal expansion of the lens monomer is poor, and the adhesive surface between the pressure-sensitive adhesive tape 1 and the mold 30 and the pressure-sensitive adhesive tapes 1 to each other There is a possibility that a gap is formed in the wrap portion of the resin and liquid leakage of the resin occurs, resulting in chipping of the lens. The holding power at 70 ° C. is more preferably 80 minutes or more and 300 minutes or less.

  When the pressure-sensitive adhesive force of the pressure-sensitive adhesive tape 1 to glass is 2.0 N / 10 mm or less, the adhesion between the pressure-sensitive adhesive tape and the mold is lowered, the thermal response of the lens monomer cannot be followed, and the tape peels off. There is a risk that. On the other hand, when the pressure-sensitive adhesive force of the pressure-sensitive adhesive tape 1 to glass exceeds 6.0 N / 10 mm, the adhesion between the pressure-sensitive adhesive tape and the mold increases, and the adhesive remains on the mold when the pressure-sensitive adhesive tape is peeled off. May occur.

(Example)
Examples of the adhesive tape for molding a plastic lens according to the present invention and comparative examples are shown below. However, the adhesive tape for molding a plastic lens of the present invention is not limited to this.

  Examples of the index of the cohesive force and elastic modulus of the pressure-sensitive adhesive in the present invention generally include storage elastic modulus, loss tangent tan δ, shear force, and holding force, but are not particularly limited. The storage elastic modulus and loss tangent tan δ are measured and evaluated using a dynamic viscoelasticity measuring device while continuously changing the temperature under the condition of a predetermined frequency. For example, the adhesive force of the adhesive tape with a width of 25 mm and a length of 50 mm is applied to two stainless steel plates so that the shear force is 25 mm × 25 mm, and a 19.6 N roller is pressed for 5 reciprocating pressures. After standing for a predetermined time under conditions, using a tensile tester, measurement and evaluation are performed by fixing one of the stainless steel plates and pulling the other at a predetermined speed in accordance with JIS Z 0237. The holding force conforms to JISZ 0237 (ISO 29863), and a 50 mm × 100 mm stainless steel plate is pasted with an adhesive tape having a width of 25 mm and a length of 25 mm. Measure and evaluate the deviation or drop time after 24 hours of application with a load of .8N.

  Moreover, as an index of the adhesive residue on the mold of the adhesive, the adhesive strength was evaluated, but it is not particularly limited. This adhesive strength conforms to JISZ 0237 (ISO 29862), and an adhesive tape having a width of 25 mm and a length of 125 mm is attached to a glass plate as an adherend, and a 19.6 N roller is pressed to 10 ± 0.5 mm / Adhering by reciprocating twice at a speed of s, peeling off in 180 ° direction with a tensile tester within 1 minute, and measuring and evaluating the adhesive strength with the adherend at that time.

  Moreover, the low molecular weight siloxane determination of the adhesive tape for plastic lens molding was performed under [1] pretreatment conditions and [2] analysis conditions. The conditions of [1] are shown below. 0.25 g of the chopped sample was immersed in 10 mL of acetone (containing 20 μg / mL of n-tetradecane as an internal standard), and allowed to stand at room temperature for 24 hours after sealing. Gas chromatographic analysis was performed using the obtained immersion liquid as a test liquid. The relative sensitivity with n-tetradecane was 2.62.

  The analysis conditions of the gas chromatograph with a flame ionization detector (GC / FID) of [2] are shown below. Apparatus: 7890A manufactured by Agilent Technologies, column: DB-5 manufactured by J & W (length 30 m, inner diameter 0.25 mm, film thickness 0.25 μm), column temperature: 50 ° C. (5 minutes) − (10 ° C./minute)→300° C. (60 minutes), inlet temperature: 300 ° C., detector temperature: 300 ° C., carrier gas: He, injection method: pulsed splitless, injection amount: 1 μL, detector: flame ionization detector (FID).

The polyorganosiloxane gum (G) of the pressure-sensitive adhesive used in the present examples and comparative examples is free of alkenyl groups and polyorganosiloxane gums containing an alkenyl group at the side chain and terminal having a polymerization average molecular weight of about 500,000. The containing polyorganosiloxane gum was used. The silicone resin (R) used was an MQ resin having a polymerization average molecular weight of about 5000 and comprising a monofunctional (M unit) and a tetrafunctional (Q unit) siloxane unit. The pressure-sensitive adhesives (A) to (D) in which the blending ratio of these polyorganosiloxane gum and MQ resin was changed were used.
(A) Adhesive A: alkenyl group-containing polyorganosiloxane gum G / R = 30/70
(B) Adhesive B: alkenyl group-containing polyorganosiloxane gum G / R = 70/30
(C) Adhesive C: alkenyl group-free polyorganosiloxane gum G / R = 30/70
(D) Adhesive D: alkenyl group-free polyorganosiloxane gum G / R = 70/30

Table 1 below shows a blending example of the pressure-sensitive adhesive and the crosslinking agent in each Example and each Comparative Example.
Table 2 below shows the heat treatment temperature, adhesion to glass, holding power, amount of low molecular siloxane, and test results in each Example and Comparative Example. Table 3 below shows the results of the presence or absence of tape peeling, the presence or absence of mold glue residue, the presence or absence of lens chipping, the presence or absence of thickness change, and the presence or absence of whitening in the initial tape and the tape after 3 months.

Example 1
Prepare a toluene solution containing 60 parts by weight of adhesive A, 15 parts by weight of adhesive C, and 25 parts by weight of adhesive D, and use an effective crosslinking agent for the adhesive (Toray Dow Corning Co., Ltd.) BY24-741 manufactured by Co., Ltd. 0.60 part by weight (1.0 part by weight with respect to the alkenyl group-containing adhesive), 0.50 part by weight of catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) in toluene uniformly The mixture was stirred and mixed, and added to the toluene solution and stirred to prepare an adhesive solution. This pressure-sensitive adhesive solution is applied to a polyester (PET) film substrate (thickness 50 μm) manufactured by Toray Industries, Inc. so that the thickness of the pressure-sensitive adhesive layer is 20 μm, and the maximum temperature of heat treatment (drying) is 180 ° C. Cured to obtain an adhesive tape for molding a plastic lens having a total thickness of 70 μm (hereinafter sometimes referred to as an adhesive tape).

  As shown in Table 1, this pressure-sensitive adhesive comprises 40 parts by weight of polyorganosiloxane gum (G) and 60 parts by weight of silicone resin (R), 60 parts by weight of silicone pressure-sensitive adhesive containing alkenyl groups, The silicone adhesive containing no group is composed of 40 parts by weight. The pressure-sensitive adhesive tape 1 using this pressure-sensitive adhesive has an adhesive strength to a glass plate of 4.5 N / 10 mm, a 70 ° C. holding power of 172 minutes as shown in Table 2, and a low molecular weight siloxane of 3 to 10 mer. The total amount was 64 μg / g, and the total amount of the low-molecular siloxane of 3 to 20 mer was 2600 μg / g.

  As shown in Table 3, the plastic lens produced using this adhesive tape 1 was a non-defective lens without tape peeling, adhesive residue on the mold, chipping of the lens, thickness change, and whitening. . Therefore, it can be said that the pressure-sensitive adhesive tape 1 has characteristics necessary for lens molding. In addition, the adhesive tape 1 obtained in Example 1 had a 70 ° C. holding power of 185 minutes after being stored at 40 ° C. for 3 months, and hardly changed from the initial value. When the lens was molded, a non-defective lens that did not require polishing of the lens periphery or cutting of the lens surface was obtained. Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding even after long-term storage.

The meanings of the evaluation items for the plastic lens are as follows.
<Tape peeling>
The tape peeling means that the adhesive strength between the adhesive tape and the mode is low, and the tape is peeled off from the mold due to the thermal stress of the resin, making it impossible to mold the lens.
<Lack of lens>
Lens chipping means that resin before curing leaks from the cavity during lens molding.
<Change thickness>
The thickness change means that a lens having a thickness smaller than that of a plastic lens to be originally obtained can be obtained by shrinkage in the thickness direction of the resin accompanying the polymerization reaction.
<Remaining glue on mold>
The adhesive residue on the mold means that the adhesive of the tape coheses and breaks when the lens is removed, and the adhesive remains on the mold.
<Whitening>
Whitening means that the low molecular weight siloxane in the pressure-sensitive adhesive is eluted in the resin, and whitening occurs on the outer peripheral edge of the lens.

(Example 2)
Prepare a toluene solution containing 60 parts by weight of adhesive A, 15 parts by weight of adhesive C, and 25 parts by weight of adhesive D, and use an effective crosslinking agent for the adhesive (Toray Dow Corning Co., Ltd.) BY24-741 manufactured by 0.3 parts by weight (0.5 parts by weight with respect to the alkenyl group-containing adhesive) and 0.50 parts by weight of the catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) in toluene. The mixture was stirred and mixed, and added to the toluene solution and stirred to prepare an adhesive solution. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1.

  As shown in Table 2, the adhesive tape 1 using this adhesive has an adhesive strength to a glass plate of 5.0 N / 10 mm, a 70 ° C. holding force drops in 132 minutes, and is a low molecular siloxane of 3-10 mer. The total amount was 120 μg / g, and the total amount of the low-molecular siloxane of 3 to 20 mer was 3521 μg / g.

  As shown in Table 3, the plastic lens produced using this adhesive tape 1 was a non-defective lens without tape peeling, adhesive residue on the mold, chipping of the lens, thickness change, and whitening. . Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding.

  In addition, the adhesive tape 1 obtained in Example 2 had a 70 ° C. holding force dropped to 162 minutes after storage at 40 ° C. for 3 months, and hardly changed from the initial value. When the lens was molded, a non-defective lens that did not require polishing of the lens periphery or cutting of the lens surface was obtained. Therefore, it can be said that the pressure-sensitive adhesive tape 1 has characteristics necessary for lens molding even after long-term storage.

(Example 3)
Prepare a toluene solution containing 60 parts by weight of adhesive A, 15 parts by weight of adhesive C, and 25 parts by weight of adhesive D, and use an effective crosslinking agent for the adhesive (Toray Dow Corning Co., Ltd.) BY24-741 manufactured by 0.9) 0.9 parts by weight (1.5 parts by weight with respect to the alkenyl group-containing pressure-sensitive adhesive) and 0.50 parts by weight of the catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) in toluene The mixture was stirred and mixed, and added to the toluene solution and stirred to prepare an adhesive solution. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1.

  The pressure-sensitive adhesive tape 1 using this pressure-sensitive adhesive has an adhesive strength to a glass plate of 4.0 N / 10 mm, a 70 ° C. holding force drops in 247 minutes as shown in Table 2, and is a low molecular siloxane of 3 to 10 mer. The total amount was 55 μg / g, and the total amount of 3 to 20-mer low-molecular siloxane was 2722 μg / g.

  As shown in Table 3, the plastic lens produced using this adhesive tape 1 was a non-defective lens without tape peeling, adhesive residue on the mold, chipping of the lens, thickness change, and whitening. . Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding. In addition, the adhesive tape 1 obtained in Example 3 had a 70 ° C. holding force of 229 minutes after being stored at 40 ° C. for 3 months, and hardly changed from the initial value. When the lens was molded, a non-defective lens that did not require polishing of the lens periphery or cutting of the lens surface was obtained. Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding even after long-term storage.

Example 4
Prepare a toluene solution containing 50 parts by weight of adhesive A, 20 parts by weight of adhesive B, 15 parts by weight of adhesive C, and 15 parts by weight of adhesive D, and effectively crosslink the adhesive. Agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) 0.8 part by weight (1.1 parts by weight with respect to the alkenyl group-containing adhesive), catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) 0.50 A weight part was uniformly stirred and mixed in toluene, and added to the toluene solution and stirred to prepare an adhesive solution. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1.

  As shown in Table 1, this pressure-sensitive adhesive comprises 44 parts by weight of polyorganosiloxane gum, 56 parts by weight of silicone resin, 70 parts by weight of silicone pressure-sensitive adhesive containing alkenyl groups, and no silicone containing alkenyl groups. The pressure-sensitive adhesive is composed of 30 parts by weight. The pressure-sensitive adhesive tape 1 using this pressure-sensitive adhesive drops as shown in Table 2 in an amount of 3.5 N / 10 mm for the glass plate and 70 ° C. holding power of 378 (corresponding to the values in Table 2). The total amount of 10-mer low-molecular siloxane was 55 μg / g, and the total amount of 3-20-mer low-molecular siloxane was 3211 μg / g.

  As shown in Table 3, the plastic lens produced using this adhesive tape 1 was a non-defective lens without tape peeling, adhesive residue on the mold, chipping of the lens, thickness change, and whitening. . Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding. In addition, the adhesive tape 1 obtained in Example 4 dropped at an amount of 70 ° C. holding power of 355 (corresponding to the value in Table 2) even after being stored at 40 ° C. for 3 months, and the initial value changed. A plastic lens was molded in the same manner, and a good lens that did not require polishing of the lens periphery or cutting of the lens surface was obtained. Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding even after long-term storage.

(Example 5)
Prepare a toluene solution containing 50 parts by weight of adhesive A, 35 parts by weight of adhesive C, and 15 parts by weight of adhesive D, and use an effective crosslinking agent for the above adhesive (Toray Dow Corning Co., Ltd.) BY24-741 made by BY) 0.4 parts by weight (0.8 parts by weight with respect to the alkenyl group-containing pressure-sensitive adhesive) and 0.50 parts by weight of the catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) in toluene The mixture was stirred and mixed, and added to the toluene solution and stirred to prepare an adhesive solution. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1.

  As shown in Table 1, this pressure-sensitive adhesive comprises 36 parts by weight of polyorganosiloxane gum, 64 parts by weight of silicone resin, 50 parts by weight of silicone pressure-sensitive adhesive containing alkenyl groups, and silicone containing no alkenyl groups. The pressure-sensitive adhesive is composed of 50 parts by weight. The pressure-sensitive adhesive tape 1 using this pressure-sensitive adhesive has an adhesive strength to a glass plate of 6.0 N / 10 mm as shown in Table 2, a 70 ° C. holding power drops in 122 minutes, and is a low molecular siloxane composed of 3 to 10 mers. The total amount was 47 μg / g, and the total amount of low-molecular siloxane of 3 to 20 mer was 2824 μg / g.

As shown in Table 3, the plastic lens produced using this adhesive tape 1 was a non-defective lens without tape peeling, adhesive residue on the mold, chipping of the lens, thickness change, and whitening. . Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding.
In addition, the adhesive tape 1 obtained in Example 5 had a 70 ° C. holding force that dropped in 138 minutes after being stored at 40 ° C. for 3 months. When the lens was molded, a non-defective lens that did not require polishing of the lens periphery or cutting of the lens surface was obtained. Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding even after long-term storage.

(Example 6)
As shown in Table 1, the pressure-sensitive adhesive in Example 6 is prepared as a toluene solution containing 50 parts by weight of pressure-sensitive adhesive A, 15 parts by weight of pressure-sensitive adhesive C, and 35 parts by weight of pressure-sensitive adhesive D. The cross-linking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) and the catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) are 0.4 parts by weight (based on the alkenyl group-containing pressure-sensitive adhesive). 0.8 parts by weight) is blended. As shown in Table 1, this pressure-sensitive adhesive comprises 44 parts by weight of polyorganosiloxane gum, 56 parts by weight of silicone resin, 50 parts by weight of silicone pressure-sensitive adhesive containing alkenyl groups, and silicone containing no alkenyl groups. The pressure-sensitive adhesive is composed of 50 parts by weight.

  The pressure-sensitive adhesive tape 1 using this pressure-sensitive adhesive has an adhesive strength to a glass plate of 3.5 N / 10 mm as shown in Table 2, a 70 ° C. holding power drops in 51 minutes, and is a low molecular siloxane of 3-10 mer. The total amount was 96 μg / g, and the total amount of low-molecular siloxane of 3 to 20 mer was 4110 μg / g. As shown in Table 3, the plastic lens produced using this adhesive tape 1 was a non-defective lens without tape peeling, adhesive residue on the mold, chipping of the lens, thickness change, and whitening. . Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding.

  In addition, the adhesive tape 1 obtained in Example 6 had a 70 ° C. holding power of 53 minutes after storage at 40 ° C. for 3 months, and showed little change from the initial value. When the lens was molded, a non-defective lens that did not require polishing of the lens periphery or cutting of the lens surface was obtained. Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding even after long-term storage.

(Example 7)
As shown in Table 1, the pressure-sensitive adhesive in Example 7 is prepared as a toluene solution containing 55 parts by weight of pressure-sensitive adhesive A, 15 parts by weight of pressure-sensitive adhesive B, and 30 parts by weight of pressure-sensitive adhesive C. The crosslinking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) and the catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) are 0.8 parts by weight (based on the alkenyl group-containing pressure sensitive adhesive). 1.1 parts by weight) is blended. As shown in Table 1, this pressure-sensitive adhesive comprises 36 parts by weight of polyorganosiloxane gum, 64 parts by weight of silicone resin, 70 parts by weight of silicone pressure-sensitive adhesive containing alkenyl groups, and silicone containing no alkenyl groups. The pressure-sensitive adhesive is composed of 30 parts by weight. The pressure-sensitive adhesive tape 1 using this pressure-sensitive adhesive has an adhesive strength to a glass plate of 4.0 N / 10 mm, a 70 ° C. holding force drops in 472 minutes, and a 3-10 mer low molecular siloxane as shown in Table 2. The total amount was 80 μg / g, and the total amount of the low-molecular siloxane of 3 to 20 mer was 3850 μg / g. As shown in Table 3, the plastic lens produced using this adhesive tape 1 was a non-defective lens without tape peeling, adhesive residue on the mold, chipping of the lens, thickness change, and whitening. . Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding.

  In addition, the adhesive tape 1 obtained in Example 7 had a 70 ° C. holding power of 487 minutes even after being stored at 40 ° C. for 3 months, and hardly changed from the initial value. When the lens was molded, a non-defective lens that did not require polishing of the lens periphery or cutting of the lens surface was obtained. Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding even after long-term storage.

(Example 8)
A pressure-sensitive adhesive tape was prepared in the same manner as in Example 1 except that the same pressure-sensitive adhesive as in Example 1 was used and the maximum temperature for heat treatment (dry operation) was 190 ° C. The pressure-sensitive adhesive tape 1 using this pressure-sensitive adhesive has an adhesive strength to a glass plate of 6.0 N / 10 mm as shown in Table 2, a 70 ° C. holding force drops in 125 minutes, and is a low molecular siloxane of 3 to 10 mer. The total amount was 0 μg / g, and the total amount of low-molecular siloxane of 3 to 20 mer was 1980 μg / g. As shown in Table 3, the plastic lens produced using this adhesive tape 1 was a non-defective lens without tape peeling, adhesive residue on the mold, chipping of the lens, thickness change, and whitening. . Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding. In addition, the adhesive tape 1 obtained in Example 8 had a 70 ° C. holding power of 140 minutes after being stored at 40 ° C. for 3 months, and hardly changed from the initial value. When the lens was molded, a non-defective lens that did not require polishing of the lens periphery or cutting of the lens surface was obtained. Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding even after long-term storage.

Example 9
Prepare a toluene solution containing 60 parts by weight of adhesive A, 15 parts by weight of adhesive C, and 25 parts by weight of adhesive D, and use an effective crosslinking agent for the adhesive (Toray Dow Corning Co., Ltd.) BY24-741 manufactured by 0.6) 0.6 parts by weight (1.0 parts by weight with respect to the alkenyl group-containing pressure-sensitive adhesive) and 0.60 parts by weight of the catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) in toluene The mixture was stirred and mixed, and added to the toluene solution and stirred to prepare an adhesive solution. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1 at a heat treatment temperature of 130 ° C. As shown in Table 1, this pressure-sensitive adhesive is 40 parts by weight of organopolysiloxane gum, 60 parts by weight of silicone resin, 60 parts by weight of silicone pressure-sensitive adhesive containing alkenyl groups, and silicone containing no alkenyl groups. The adhesive is composed of 40 parts by weight.

  As shown in Table 2, the pressure-sensitive adhesive tape using this pressure-sensitive adhesive has an adhesive strength of 5.0 N / 10 mm, a 70 ° C. holding power that drops in 175 minutes, and the total amount of 3 to 10-mer low molecular siloxane is It was 182 μg / g, and the total amount of the low-molecular siloxane of 3 to 20 mer was 6502 μg / g. As shown in Table 3, the plastic lens produced using this adhesive tape did not peel off the tape, left glue on the mold, chipped the lens, and the lens did not change in thickness. Whitening occurred on the lens. In addition, the adhesive tape obtained in Example 9 had a holding power of 70 ° C. dropped in 192 minutes even after being stored at 40 ° C. for 3 months, and almost no change from the initial value was observed. The lens was whitened at a level that was not present.

(Example 10)
Prepare a toluene solution containing 60 parts by weight of adhesive A, 15 parts by weight of adhesive C, and 25 parts by weight of adhesive D, and use an effective crosslinking agent for the adhesive (Toray Dow Corning Co., Ltd.) BY24-741 manufactured by 0.6) 1.0 part by weight (1.0 part by weight with respect to the alkenyl group-containing pressure-sensitive adhesive) and 0.50 part by weight of catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) in toluene The mixture was stirred and mixed, and added to the toluene solution and stirred to prepare an adhesive solution. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1 at a heat treatment temperature of 210 ° C. As shown in Table 1, this pressure-sensitive adhesive is 40 parts by weight of organopolysiloxane gum, 60 parts by weight of silicone resin, 60 parts by weight of silicone pressure-sensitive adhesive containing alkenyl groups, and silicone containing no alkenyl groups. The adhesive is composed of 40 parts by weight.

  As shown in Table 2, the pressure-sensitive adhesive tape using this pressure-sensitive adhesive has an adhesive strength of 5.0 N / 10 mm, a 70 ° C. holding power that drops in 186 minutes, and the total amount of low-molecular siloxane of 3-10 mer is It was 196 μg / g, and the total amount of the low molecular siloxane of 3 to 20 mer was 8096 μg / g. As shown in Table 3, the plastic lens produced using this adhesive tape does not peel off the tape, remains mold paste, lacks the lens, and does not change in thickness. Occurred. In addition, the adhesive tape obtained in Example 10 has a practical problem that the holding force at 70 ° C. drops in 170 minutes even after being stored at 40 ° C. for 3 months, and hardly changes from the initial value. Whitening of the lens occurred at a level that was not present.

(Comparative Example 1)
A toluene solution containing 75 parts by weight of adhesive A and 25 parts by weight of adhesive B was prepared, and a crosslinking agent effective for the adhesive (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) 0.2 Part by weight (0.2 parts by weight with respect to the alkenyl group-containing pressure-sensitive adhesive) and 0.50 part by weight of a catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) are uniformly stirred and mixed in toluene, and the above toluene solution Was added to and stirred to prepare a pressure-sensitive adhesive solution. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1. As shown in Table 1, this pressure-sensitive adhesive is composed of 40 parts by weight of polyorganosiloxane gum, 60 parts by weight of silicone resin, and 100 parts by weight of silicone pressure-sensitive adhesive containing alkenyl groups.

  The pressure-sensitive adhesive tape 1 using this pressure-sensitive adhesive has an adhesive strength to a glass plate of 5.5 N / 10 mm, a 70 ° C. holding power that drops in 96 minutes as shown in Table 2, and is a low molecular siloxane of 3 to 10 mer. The total amount was 60 μg / g, and the total amount of the low-molecular siloxane of 3 to 20 mer was 3864 μg / g. As shown in Table 3, the plastic lens produced using this adhesive tape 1 has no tape peeling, no adhesive residue on the mold, no thickness change, and no whitening. However, after the adhesive tape obtained in Comparative Example 1 was stored at 40 ° C. for 3 months, the holding force at 70 ° C. dropped in 1056 minutes, and the holding force increased significantly. When a plastic lens was molded in the same manner using this adhesive tape, a part of the lens was chipped, and a good lens could not be obtained.

(Comparative Example 2)
Prepare a toluene solution containing 80 parts by weight of adhesive A, 5 parts by weight of adhesive C, and 15 parts by weight of adhesive D, and use a crosslinking agent effective for the adhesive (Toray Dow Corning Co., Ltd.) BY24-741 manufactured by BYO) 0.9 parts by weight (1.1 parts by weight with respect to the alkenyl group-containing pressure-sensitive adhesive) and 0.50 parts by weight of the catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) were uniformly in toluene. The mixture was stirred and mixed, and added to the toluene solution and stirred to prepare an adhesive solution. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1.

  As shown in Table 1, this pressure-sensitive adhesive comprises 36 parts by weight of polyorganosiloxane gum, 64 parts by weight of silicone resin, 80 parts by weight of silicone pressure-sensitive adhesive containing alkenyl groups, and silicone containing no alkenyl groups. The pressure-sensitive adhesive is composed of 20 parts by weight. The pressure-sensitive adhesive tape 1 using this pressure-sensitive adhesive has an adhesive strength to a glass plate of 5.0 N / 10 mm as shown in Table 2, a 70 ° C. holding power drops in 1021 minutes, and is a low molecular siloxane of 3-10 mer. The total amount was 66 μg / g, and the total amount of low-molecular siloxane of 3 to 20 mer was 2901 μg / g. As shown in Table 3, the plastic lens produced using this pressure-sensitive adhesive tape did not peel off the tape, changed thickness, remained glue on the mold, or whitened, but part of the lens was chipped. In addition, the pressure-sensitive adhesive tape obtained in Comparative Example 2 had 70 ° C. holding power dropped to 1151 minutes even after being stored at 40 ° C. for 3 months, and had an initial holding power of 70 ° C. after storage at 40 ° C. for 3 months. The holding power was large, and a part of the lens was chipped. As a result, a good lens could not be obtained.

(Comparative Example 3)
Prepare a toluene solution containing 40 parts by weight of adhesive A, 25 parts by weight of adhesive C, and 35 parts by weight of adhesive D, and use an effective crosslinking agent for the adhesive (Toray Dow Corning Co., Ltd.) BY24-741 made by BY) 0.3 parts by weight (0.8 parts by weight with respect to the alkenyl group-containing pressure-sensitive adhesive) and 0.50 parts by weight of the catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) were uniformly in toluene. The mixture was stirred and mixed, and added to the toluene solution and stirred to prepare an adhesive solution. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1.

  As shown in Table 1, this pressure-sensitive adhesive comprises 44 parts by weight of polyorganosiloxane gum, 56 parts by weight of silicone resin, 40 parts by weight of silicone pressure-sensitive adhesive containing alkenyl groups, and silicone containing no alkenyl groups. The pressure-sensitive adhesive is composed of 60 parts by weight. As shown in Table 2, the pressure-sensitive adhesive tape using this pressure-sensitive adhesive has an adhesive strength of 4.5 N / 10 mm, a 70 ° C. holding power that drops in 41 minutes, and the total amount of low-molecular siloxanes in a 3-10 mer. Was 98 μg / g, and the total amount of low-molecular siloxane of 3 to 20 mer was 4215 μg / g.

  As shown in Table 3, the plastic lens produced using this adhesive tape did not peel off the tape, left glue on the mold, chipped or whitened, but the lens thickness changed, resulting in a non-defective product. A lens could not be obtained. In addition, the pressure-sensitive adhesive tape obtained in Comparative Example 3 had a 70 ° C. holding power of 36 minutes after being stored at 40 ° C. for 3 months, and had an initial holding power of 70 ° C. after storage at 40 ° C. for 3 months. The holding power was small, and the lens thickness changed, resulting in failure to obtain a good lens.

(Comparative Example 4)
Prepare a toluene solution containing 70 parts by weight of adhesive A, 20 parts by weight of adhesive C, and 10 parts by weight of adhesive D, and use an effective crosslinking agent for the adhesive (Toray Dow Corning Co., Ltd.) BY24-741 manufactured by BY) 0.7 parts by weight (1.0 part by weight with respect to the alkenyl group-containing pressure-sensitive adhesive) and 0.50 parts by weight of the catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) in toluene The mixture was stirred and mixed, and added to the toluene solution and stirred to prepare an adhesive solution. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1.

  As shown in Table 1, this pressure-sensitive adhesive comprises 34 parts by weight of polyorganosiloxane gum, 66 parts by weight of silicone resin, 70 parts by weight of silicone pressure-sensitive adhesive containing alkenyl groups, and silicone containing no alkenyl groups. The pressure-sensitive adhesive is composed of 30 parts by weight.

  As shown in Table 2, the pressure-sensitive adhesive tape using this pressure-sensitive adhesive has an adhesive strength to the glass plate of 6.0 N / 10 mm, a 70 ° C. holding force that drops in 562 minutes, and the total amount of low-molecular siloxanes of 3 to 10 mer. It was 126 μg / g, and the total amount of low-molecular siloxane of 3 to 20 mer was 4088 μg / g. As shown in Table 3, the plastic lens produced using this adhesive tape did not peel off the tape, left the glue on the mold, changed the thickness of the lens, or whitened. As a result, a good lens could not be obtained. In addition, the adhesive tape obtained in Comparative Example 4 had a 70 ° C. holding force that dropped after 589 minutes after being stored at 40 ° C. for 3 months, and showed little change from the initial value. As a result, a non-defective lens could not be obtained.

(Comparative Example 5)
Prepare a toluene solution containing 50 parts by weight of adhesive A, 10 parts by weight of adhesive C, and 40 parts by weight of adhesive D, and use an effective crosslinking agent for the adhesive (Toray Dow Corning Co., Ltd.) BY24-741 manufactured by 0.5 parts by weight (1.0 part by weight with respect to the alkenyl group-containing pressure-sensitive adhesive) and 0.50 parts by weight of catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) in toluene are homogeneous. The mixture was stirred and mixed, and added to the toluene solution and stirred to prepare an adhesive solution. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1.

  As shown in Table 1, this pressure-sensitive adhesive comprises 46 parts by weight of polyorganosiloxane gum, 54 parts by weight of silicone resin, 50 parts by weight of silicone pressure-sensitive adhesive containing alkenyl groups, and silicone containing no alkenyl groups. The pressure-sensitive adhesive is composed of 50 parts by weight. As shown in Table 2, the pressure-sensitive adhesive tape using this pressure-sensitive adhesive had an adhesive strength of 3.5 N / 10 mm, a 70 ° C. holding power dropped in 42 minutes, and the total amount of low molecular siloxanes of 3-10 mer was It was 40 μg / g, and the total amount of the low-molecular siloxane of 3 to 20 mer was 3112 μg / g.

  As shown in Table 3, the plastic lens produced using this adhesive tape did not peel off the tape on the glass plate, left glue on the mold, chipped the lens, or whitened, but the lens was changed in thickness. As a result, a good lens could not be obtained. In addition, the adhesive tape obtained in Comparative Example 5 had a 70 ° C. holding force that dropped for 46 minutes even after being stored at 40 ° C. for 3 months. As a result, a good lens could not be obtained.

(Comparative Example 6)
Prepare a toluene solution containing 80 parts by weight of adhesive A, 10 parts by weight of adhesive C, and 10 parts by weight of adhesive D, and use a crosslinking agent effective for the adhesive (Toray Dow Corning Co., Ltd.) BY24-741 manufactured by BYO) 0.9 parts by weight (1.1 parts by weight with respect to the alkenyl group-containing pressure-sensitive adhesive) and 0.50 parts by weight of the catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) were uniformly in toluene. The mixture was stirred and mixed, and added to the toluene solution and stirred to prepare an adhesive solution. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1.

  As shown in Table 1, this pressure-sensitive adhesive comprises 34 parts by weight of polyorganosiloxane gum, 66 parts by weight of silicone resin, 80 parts by weight of silicone pressure-sensitive adhesive containing alkenyl groups, and silicone containing no alkenyl groups. The pressure-sensitive adhesive is composed of 20 parts by weight. As shown in Table 2, the pressure-sensitive adhesive tape using this pressure-sensitive adhesive has an adhesive strength to a glass plate of 5.5 N / 10 mm, a 70 ° C. holding force of 1412 minutes, and the total amount of low molecular siloxanes of 3 to 10 mer is 138 μg / g, and the total amount of the low molecular siloxane of 3 to 20 mer was 3939 μg / g. As shown in Table 3, the plastic lens produced using this adhesive tape did not peel off the tape, left adhesive paste on the mold, thickness change of the lens, or whitening, but a part of the lens was chipped. As a result, a good lens could not be obtained. In addition, the pressure-sensitive adhesive tape obtained in Comparative Example 6 had a 70 ° C. holding power of 1326 minutes even after being stored at 40 ° C. for 3 months, and had an initial holding power of 70 ° C. after storage at 40 ° C. for 3 months. The holding power was large and the lens was chipped. As a result, a good lens could not be obtained.

(Comparative Example 7)
Prepare a toluene solution containing 40 parts by weight of pressure-sensitive adhesive A, 20 parts by weight of pressure-sensitive adhesive C, and 40 parts by weight of pressure-sensitive adhesive D, and use a crosslinking agent effective for the pressure-sensitive adhesive (Toray Dow Corning Co., Ltd.) BY24-741 made by BY) 0.3 parts by weight (0.8 parts by weight with respect to the alkenyl group-containing pressure-sensitive adhesive) and 0.50 parts by weight of the catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) were uniformly in toluene. The mixture was stirred and mixed, and added to the toluene solution and stirred to prepare an adhesive solution. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1. As shown in Table 1, this pressure-sensitive adhesive comprises 46 parts by weight of polyorganosiloxane gum, 54 parts by weight of silicone resin, 40 parts by weight of silicone pressure-sensitive adhesive containing alkenyl groups, and silicone containing no alkenyl groups. The pressure-sensitive adhesive is composed of 60 parts by weight.

  As shown in Table 2, the pressure-sensitive adhesive tape using this pressure-sensitive adhesive falls in an adhesive strength of 3.5 N / 10 mm and a holding power of 70 ° C. for 34 minutes, and the total amount of low-molecular siloxane of 3-10 mer is 159 μg. The total amount of low-molecular siloxane of 3 to 20 mer was 4620 μg / g. As shown in Table 3, the plastic lens produced using this adhesive tape did not peel off the tape, left adhesive paste on the mold, chipped the lens, or whitened. A good lens could not be obtained. In addition, the pressure-sensitive adhesive tape obtained in Comparative Example 7 had 70 ° C. holding power dropped to 26 minutes after being stored at 40 ° C. for 3 months, and had an initial holding power of 70 ° C. after storage at 40 ° C. for 3 months. The holding power was small, and the lens thickness changed, resulting in failure to obtain a good lens.

(Comparative Example 8)
Prepare a toluene solution containing 60 parts by weight of adhesive B, 10 parts by weight of adhesive C, and 30 parts by weight of adhesive D, and use an effective crosslinking agent for the adhesive (Toray Dow Corning Co., Ltd.) BY24-741 manufactured by 0.6) 1.0 part by weight (1.0 part by weight with respect to the alkenyl group-containing pressure-sensitive adhesive) and 0.50 part by weight of catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) in toluene The mixture was stirred and mixed, and added to the toluene solution and stirred to prepare an adhesive solution. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1.

  As shown in Table 1, the pressure-sensitive adhesive is 66 parts by weight of polyorganosiloxane gum, 34 parts by weight of silicone resin, 60 parts by weight of silicone pressure-sensitive adhesive containing alkenyl groups, and silicone containing no alkenyl groups. The adhesive is composed of 40 parts by weight. As shown in Table 2, the pressure-sensitive adhesive tape using this pressure-sensitive adhesive has an adhesive strength to a glass plate of 1.5 N / 10 mm, a 70 ° C. holding force of 16 minutes, and a total amount of low molecular siloxanes of 3 to 10 mer is 148 μg. The total amount of 3-20 mer low molecular siloxane was 4488 μg / g. As shown in Table 3, the plastic lens produced using this pressure-sensitive adhesive tape peeled off, and as a result, a good lens could not be obtained. In addition, the adhesive tape obtained in Comparative Example 8 peeled off after being stored at 40 ° C. for 3 months, and the 70 ° C. holding force dropped to 26 minutes, and the initial holding force at 40 ° C. for 3 months. The 70 ° C. holding force after storage was small, and tape peeling occurred, resulting in failure to obtain a good lens.

(Comparative Example 9)
Prepare a toluene solution containing 60 parts by weight of adhesive B, 25 parts by weight of adhesive C, and 15 parts by weight of adhesive D, and use an effective crosslinking agent for the adhesive (Toray Dow Corning Co., Ltd.) BY24-741 manufactured by 0.6) 1.0 part by weight (1.0 part by weight with respect to the alkenyl group-containing pressure-sensitive adhesive) and 0.50 part by weight of catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) in toluene The mixture was stirred and mixed, and added to the toluene solution and stirred to prepare an adhesive solution. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1. As shown in Table 1, this pressure-sensitive adhesive comprises 60 parts by weight of polyorganosiloxane gum, 40 parts by weight of silicone resin, 60 parts by weight of silicone pressure-sensitive adhesive containing alkenyl groups, and silicone containing no alkenyl groups. The adhesive is composed of 40 parts by weight.

  As shown in Table 2, the pressure-sensitive adhesive tape using this pressure-sensitive adhesive has an adhesive strength to a glass plate of 2.0 N / 10 mm, a 70 ° C. holding power drops in 28 minutes, and the total amount of low-molecular siloxanes in a 3-10 mer. Was 110 μg / g, and the total amount of low-molecular siloxane of 3 to 20 mer was 4052 μg / g. As shown in Table 3, the plastic lens produced using this adhesive tape did not peel off the tape, remained glue on the mold, chipped the lens, or whitened, but changed its thickness, resulting in a good lens. Was not obtained. In addition, the pressure-sensitive adhesive tape obtained in Comparative Example 9 had 70 ° C. holding power dropped to 33 minutes after being stored at 40 ° C. for 3 months, and had an initial holding power of 70 ° C. after storage at 40 ° C. for 3 months. The holding power was small and the thickness was changed. As a result, a good lens could not be obtained.

(Comparative Example 10)
Prepare a toluene solution containing 40 parts by weight of adhesive A, 50 parts by weight of adhesive C, and 10 parts by weight of adhesive D, and use a crosslinking agent effective for the adhesive (Toray Dow Corning Co., Ltd.) BY24-74) 0.4 part by weight (1.0 part by weight with respect to the alkenyl group-containing adhesive), 0.50 part by weight of catalyst (Toray Dow Corning NC-25) 0.50 part by weight in toluene The mixture was stirred and mixed, and added to the toluene solution and stirred to prepare an adhesive solution. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1.

  As shown in Table 1, this pressure-sensitive adhesive comprises 34 parts by weight of polyorganosiloxane gum, 66 parts by weight of silicone resin, 40 parts by weight of silicone pressure-sensitive adhesive containing alkenyl groups, and silicone containing no alkenyl groups. The pressure-sensitive adhesive is composed of 60 parts by weight. As shown in Table 2, the pressure-sensitive adhesive tape using this pressure-sensitive adhesive has a high adhesive strength to the glass plate of 6.5 N / 10 mm, a 70 ° C. holding power drops in 110 minutes, and a low molecular siloxane of 3 to 10 mer. The total amount of low molecular weight siloxane of 3 to 20 mer was 3260 μg / g. As shown in Table 3, the plastic lens produced using this adhesive tape did not peel off the tape, chipped the lens, changed the thickness of the lens, or whitened, but left a mold paste, resulting in a good lens. Was not obtained. In addition, the pressure-sensitive adhesive tape obtained in Comparative Example 10 had 70 ° C. holding power dropped to 122 minutes even after being stored at 40 ° C. for 3 months, and almost no change from the initial value was observed. As a result, a good lens could not be obtained.

(Comparative Example 11)
Prepare a toluene solution containing 40 parts by weight of adhesive A, 25 parts by weight of adhesive C, and 35 parts by weight of adhesive D, and use an effective crosslinking agent for the adhesive (Toray Dow Corning Co., Ltd.) BY24-74) 0.2 parts by weight (0.5 parts by weight with respect to the alkenyl group-containing pressure-sensitive adhesive) and 0.5 parts by weight of the catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) are uniformly in toluene. The mixture was stirred and mixed, and added to the toluene solution and stirred to prepare an adhesive solution. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1.

  As shown in Table 1, this pressure-sensitive adhesive comprises 44 parts by weight of polyorganosiloxane gum, 56 parts by weight of silicone resin, 40 parts by weight of silicone pressure-sensitive adhesive containing alkenyl groups, and silicone containing no alkenyl groups. The pressure-sensitive adhesive is composed of 60 parts by weight. As shown in Table 2, the pressure-sensitive adhesive tape using this pressure-sensitive adhesive has 3.5 N / 10 mm adhesive strength to a glass plate, 70 ° C. holding power drops in 22 minutes, and the total amount of low-molecular siloxane in 3-10 mer. Was 96 μg / g, and the total amount of low-molecular siloxane of 3 to 20 mer was 4110 μg / g. As shown in Table 3, the plastic lens produced using this adhesive tape did not peel off the tape, remained mold paste, chipped the lens, or whitened, but the lens thickness changed, resulting in a good lens. Was not obtained. In addition, after the adhesive tape obtained in Comparative Example 11 was stored at 40 ° C. for 3 months, the 70 ° C. holding force dropped to 124 minutes, the tape peeled off, the adhesive remained on the mold, the lens was missing, and the deformation occurred. Thickness and whitening did not occur, and a good lens was obtained.

(Comparative Example 12)
Prepare a toluene solution containing 55 parts by weight of adhesive A, 25 parts by weight of adhesive B, and 20 parts by weight of adhesive C, and use a crosslinking agent effective for the adhesive (Toray Dow Corning Co., Ltd.) BY24-74) 1.3 parts by weight (1.6 parts by weight with respect to the alkenyl group-containing pressure-sensitive adhesive) and 0.5 parts by weight of the catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) are uniformly in toluene. The mixture was stirred and mixed, and added to the toluene solution and stirred to prepare an adhesive solution. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1. Using this adhesive solution, an adhesive tape was prepared in the same manner as in Example 1.

As shown in Table 1, this pressure-sensitive adhesive is 40 parts by weight of polyorganosiloxane gum, 60 parts by weight of silicone resin, 80 parts by weight of silicone pressure-sensitive adhesive containing alkenyl groups, and no silicone containing alkenyl groups. The pressure-sensitive adhesive is composed of 20 parts by weight. As shown in Table 2, the pressure-sensitive adhesive tape using this pressure-sensitive adhesive has an adhesive strength of 4.0 N / 10 mm, a 70 ° C. holding force that drops in 879 minutes, and the total amount of low-molecular siloxane of 3-10 mer. Was 80 μg / g, and the total amount of low-molecular siloxane of 3 to 20 mer was 3850 μg / g. As shown in Table 3, the plastic lens produced using this adhesive tape did not peel off the tape, remained the adhesive paste on the mold, changed the thickness of the lens, and did not whiten. A lens could not be obtained. In addition, the pressure-sensitive adhesive tape obtained in Comparative Example 12 had a 70 ° C. holding power dropped to 945 minutes after being stored at 40 ° C. for 3 months, and had an initial holding power of 70 ° C. after storage at 40 ° C. for 3 months. The holding power was large and the lens was chipped. As a result, a good lens could not be obtained.

DESCRIPTION OF SYMBOLS 1 Adhesive tape for plastic lens molding 2 Tape base material 3 Adhesive layer 30 Mold

Claims (4)

Affixed along the outer peripheral surface of a pair of molds facing each other at a predetermined interval, sealing the space formed between the pair of molds to form a cavity filled with the polymerizable monomer of the plastic lens In the adhesive tape for molding plastic lenses used to
The pressure-sensitive adhesive tape includes a strip-shaped base material and a pressure-sensitive adhesive layer that adheres the base material to the outer peripheral surface of the mold, and the pressure-sensitive adhesive layer is composed of a pressure-sensitive adhesive mainly composed of a silicone pressure-sensitive adhesive. And
(1) The silicone adhesive includes a silicone adhesive containing an alkenyl group and a silicone adhesive not containing an alkenyl group,
The composition ratio of the polyorganosiloxane gum (G) and the silicone range (R) in the silicone adhesive is
(2) 36 to 44 parts by weight of the polyorganosiloxane gum (G),
(3) A pressure-sensitive adhesive formulated so that the silicone resin (R) is 56 to 64 parts by weight,
(4) The amount of the polyorganosiloxane gum containing the alkenyl group contained in the polyorganosiloxane gum (G) is 18 to 29 parts by weight with respect to the total amount of the polyorganosiloxane gum,
(5) The cross-linking agent and the catalyst are composed of a pressure-sensitive adhesive compounded so as to be 0.5 to 1.5 parts by weight with respect to the silicone pressure-sensitive adhesive containing the alkenyl group,
(6) 70 degreeC retention strength of the said adhesive tape is 50 minutes or more and 500 minutes or less,
(7) An adhesive tape for molding a plastic lens, having an adhesive strength of 2.0 N / 10 mm or more and 6.0 N / 10 mm or less.   The total amount of 3- to 10-mer low-molecular siloxane (cyclic or linear polyorganosiloxane) contained in the silicone pressure-sensitive adhesive which is the main component of the pressure-sensitive adhesive layer is 165 μg / g or less. The adhesive tape for plastic lens molding according to claim 1.   The dimethylpolysiloxane content of trimer to 20-mer contained in the silicone pressure-sensitive adhesive which is the main component of the pressure-sensitive adhesive layer is 4850 μg or less per 1 g of pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer. The pressure-sensitive adhesive tape for molding a plastic lens according to claim 1 or 2. It is a molding method of a plastic lens molding product using the adhesive tape for plastic lens molding according to any one of claims 1 to 3, wherein a pair of molds are arranged to face each other at a predetermined interval, Cavity formation that affixes the plastic lens molding adhesive tape to the outer peripheral surfaces of the pair of molds, seals the space formed between the pair of molds, and forms a cavity filled with the polymerizable monomer A plastic lens molding product comprising: a step, a monomer filling step for filling the polymerizable monomer in the cavity, and a polymerization step for polymerizing the polymerizable monomer filled in the cavity. Method.

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