JPH0125710B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a synthetic resin film that has excellent adhesion, transparency, slipperiness, etc., and is suitable for secondary processing, as well as excellent water resistance. Synthetic resin films, especially biaxially stretched polypropylene and polyethylene terephthalate films, are used for packaging materials, metal deposition, photography, and drafting due to their excellent dimensional stability, mechanical strength, and transparency. It has been applied in a wide variety of fields, including magnetic tapes, magnetic tapes, and various other industrial uses. However, in all of these cases, the synthetic resin film does not satisfy all properties. In most applications, the film is rarely used alone, but undergoes some kind of secondary processing. Therefore, from the viewpoint of workability during processing, product performance, quality stability, etc., characteristics such as surface slipperiness and adhesiveness are particularly important issues. For example, slipperiness significantly affects the efficiency of basic operations, which are essential steps for secondary processing for all purposes, such as film unwinding, winding, slitting, cutting, and coding. For example, if the product is used for packaging, the efficiency of the automatic packaging machine will greatly influence the user's work efficiency, and if the product is used for cutting such as office work or drafting, the work efficiency such as uniformity and feedability will be greatly affected. For this reason, for the purpose of improving the slipperiness of the film surface, waxes, higher fatty acid compounds such as fatty acid amides, fatty acid metal salts, etc., or additives such as titanium dioxide, calcium carbonate, talc, kaolin, and silicon dioxide have been used. A method has been adopted in which so-called lubricants such as active inorganic compound particles are dispersed in a synthetic resin for film to give fine irregularities to the film surface after molding and to reduce the contact area between the film surfaces. In addition, especially in the case of polyester film, lubricants other than those mentioned above may be used, such as a method of forming fine particles with a metal compound catalyst used during polyester production, such as an alkali metal compound or an alkaline earth metal compound, or a method of forming fine particles with a metal compound catalyst used during polyester production. Terephthalic acid and calcium, which are one of the raw materials,
Examples include a so-called internal particle method in which particles are generated from a salt with a metal such as lithium, and a method in which these compound particles are synthesized in advance and added to the polyester production system. However, no matter which method is used, these conventional methods of adding lubricants have the disadvantage that while improving the slipperiness, the transparency inevitably decreases. It has been considered impossible to satisfy both transparency in a complete sense, and some kind of compromise has always been forced. In addition, although these methods of adding surface roughness by adding lubricant particles are effective in improving slipperiness in a temporary sense such as workability,
For example, when mechanical abrasion operations are applied continuously for a certain period of time, such as in magnetic tape applications, the protruding particles break down, causing practical defects such as the generation of white powdery dirt. It's summery. Furthermore, with regard to adhesion, for example, in the case of packaging applications, the adhesion with printing ink, in the case of metal vapor deposition, the adhesion with the vapor deposited layer, and in the case of use as a photographic film base, the adhesion with the vapor deposition layer is different. Adhesion with the gelatin layer is important when used for drafting, adhesion with the matting agent layer is important, and adhesion with the magnetic paint layer is important when used for magnetic tape. , it becomes necessary to improve adhesion without adversely affecting other properties. For this reason, a method is usually used in which a so-called anchor coating agent such as an alkyl titanate type or urethane type agent is applied to the surface of the film depending on the application. However, in general, these methods not only still have insufficient performance, but also lack versatility, such as being effective in some cases but not at all in others. Many of them themselves are extremely unstable in terms of hydrolysis, storage stability, etc. Furthermore, all of these are expensive, and since they are generally used as organic solvents, there are many dangers such as flammability and toxicity, and they are very inconvenient from the standpoints of workability, pollution, energy conservation, etc. In addition, when targeting polyester films, polyester-based and polyether-based undercoating agents that have good adhesion to polyester have recently been used in place of these anchor coating agents, an example of which can be seen in Japanese Patent Publication No. 48-37480. Teru copolymer systems and the like have been proposed. However, although these polymers generally have good adhesion to polyester films, they have poor adhesion to other two.
It is effective only in specific cases when used as a topcoat agent during subsequent processing, and has poor versatility. In addition, there are few solvents suitable for these processing agents, and when the copolymer composition is changed so that it can be applied to the polyester film surface, the applied surface becomes more sticky, and when it is wound up or The film deteriorates the slipperiness of the film surface during secondary processing, and the blocking property when left standing is large, resulting in a significant decrease in workability. Furthermore, these polyester-based, polyether-ester copolymer-based, and other undercoating agents are generally expensive, and their solvents are often highly toxic and flammable. From these points, the special public
As seen in Publication No. 16557, many attempts have been made to change the composition of the finishing agent to make it water-soluble, but in this case, as a matter of course, the resulting undercoat film has poor water resistance. Defects are likely to occur in end uses such as those in contact with moisture. On the other hand, apart from these methods, acrylic acid is used as an anchor coating agent when applying vinylidene chloride resin to plastic films, mainly polyolefin films, for the purpose of imparting heat sealing properties, gas barrier properties, etc. A water-soluble acrylic polymer consisting of an ester or methacrylic acid ester and a copolymer of acrylic acid or methacrylic acid, methylol acrylamide, acrylamide, methacrylamide, etc.
Acrylic anchor coating agents such as Japanese Patent Publication No. 80127) have been proposed. However, in this case, since it is water-soluble, problems tend to occur in applications requiring water resistance. At the same time, in the case of a completely aqueous solution, the wetting of the hydrophobic film substrate is poor, and it is difficult to obtain a uniform coating film, so that some kind of organic solvent must be used in combination. In addition, a method has been proposed in which these acrylic compounds are subjected to emulsion polymerization in a system containing a surfactant as an emulsifier and applied in the form of particles (Japanese Patent Application Laid-Open No. 155633/1984), but Water resistance is also an issue due to the agent. Furthermore, a method has been proposed in which an acrylic copolymer and a methylolated melamine compound are used in combination to form a crosslinked film to improve water resistance and adhesion (Japanese Patent Publication No. 46-42240), but the necessity of a crosslinking reaction has been proposed. Since it is a hardened film, there are many problems such as reduced reusability. On the other hand, in all cases, these conventional anchor coating agents for imparting adhesive properties have problems with the slipperiness of the film-treated surface due to their tackiness, hydrolysis, moisture absorption of the emulsifier they contain, or other reasons. This is a major problem due to the various reasons mentioned above. Therefore, the present inventors have comprehensively solved the various problems of these various conventional techniques, and instead of using a method of adding surface roughness by adding a lubricant, the present inventors have developed a method that has good slipperiness and excellent transparency while having a smooth surface. The present invention was developed as a result of extensive research in order to simultaneously satisfy both the properties of the adhesive and the adhesion to secondary processing agents. That is, at least one side of a film made of polyester resin or polyolefin resin is coated with one or two monomers selected from monomers (a) represented by the following formula.
99 to 50 mol% of species or more, 1 selected from monomer (b)
0.5 to 30 mol% of one or more species and 0.5 to 20 mol% of one or more species selected from monomer (c)
Aqueous dispersions of copolymers obtained by reacting monomer mixtures containing mol % of each of
0.01 mg/dm ² or more and less than 3.0 mg/dm ² Preferably,
A secondary product that is coated at a concentration of 0.1 to 1.0 mg/dm ² and then dried, has excellent slip properties and adhesion properties, and has good anti-blocking properties, and has better slip properties than its own. This film is particularly suitable for processing. (a)

[Formula] R ₁ = H or alkyl group having 1 to 4 carbon atoms R ₂ = alkyl group having 1 to 8 carbon atoms

[Formula] R ₃ = H or an alkyl group having 1 to 4 carbon atoms R ₄ , R ₅ = H or an alkyl group having 1 to 8 carbon atoms (b)

[Formula] R ₆ = H or alkyl group having 1 to 4 carbon atoms R ₇ = H, -(CH ₂ ) _o -OH-(CH ₂ ) _o -OR ₈ -
{(CH ₂ ) _o −O−} _n −R ₉ or

[Formula] n, m=1-3 R ₈ , R ₉ = alkyl group having 1-4 carbon atoms (c)

[Formula] R ₁₀ = H or alkyl group having 1 to 4 carbon atoms M = H or monovalent alkali metal

[Formula] CH ₂ = CHSO ₂ R ₁₂ R ₁₁ = H or an alkyl group having 1 to 4 carbon atoms R ₁₂ = H or an alkyl group having 1 to 8 carbon atoms

[Formula] R ₁₃ , R ₁₄ = H or alkyl group having 1 to 4 carbon atoms In the present invention, the film made of polyester resin includes polyethylene terephthalate,
Polyester films such as aromatic linear polyesters made of aromatic dicarboxylic acids such as polybutylene terephthalate and polyethylene naphthalate and glycols, aliphatic polyesters made of aliphatic dicarboxylic acids and glycols, and copolymers thereof. However, films made of polyolefin resin include polyethylene, polypropylene, etc., but their physical properties, surface characteristics,
From the viewpoint of applications, the present invention is particularly effective in the case of biaxially stretched polyethylene terephthalate. Monomer for forming the coating agent in the present invention
Examples of (a) include esters of acrylic acid or methacrylic acid and lower alkyl-containing alcohols such as methyl, ethyl, propyl, butyl, amyl, hexyl, heptyl, octyl, 2-ethylhexyl, or styrene and ,
0, m, p-monoalkyl styrene consisting of lower alkyl such as methyl, ethyl, propyl, butyl, amyl, hexyl, heptyl, octyl, 2,
4-(or 2,5-, 2,6-, 3,4-, 3,
5-) Dialkylstyrene, 2,4,5-(or 2,4,6-)trialkylstyrene, 2,3,
Examples include 4,5-tetraalkylstyrene and α-methyl substituted products thereof. Acrylic acid ethyl ester and methacrylic acid methyl ester or styrene are particularly useful and the combination of these in appropriate amounts plays an important role in the strong adhesion to the supporting base film and the film forming properties of the coating layer. Examples of the monomer (b) include functional monomers such as acrylic acid, methacrylic acid, and hydroxyalkyl esters, alkoxyalkyl esters, alkyl alkylene glycol esters, and glycidyl esters thereof. In particular, hydroxyalkyl methacrylate, glycidyl methacrylate, etc. are useful, and the combination of these in appropriate amounts can significantly improve the adhesive strength with the topcoat resin for secondary processing, as well as improve the solvent and other resistance of the coating film. plays an important role in increasing Monomer (c) is the most important and characteristic component in the present invention, and is obtained by a method of obtaining the undercoat copolymer in an aqueous dispersion system substantially using an emulsifier and containing no surfactant, so-called emulsifier-free emulsion polymerization. It plays a very important role in stably performing the process and at the same time developing excellent adhesive strength with the top coat for secondary processing. Examples of component (c) include ethylene sulfonic acid and its alkali metal salts such as sodium and potassium, vinyl alkyl sulfones such as vinyl methyl sulfone, vinyl ethyl sulfone, and vinyl butyl sulfone, vinyl sulfonamide, vinyl sulfonanilide, and vinyl sulfone. Examples include vinyl sulfonamides such as methylanilide, styrene sulfonic acid and its alkali metal salts such as sodium and potassium. In particular, sodium ethylene sulfonate, sodium styrene sulfonate, etc. are useful, and by using a small amount of one or two of these as a copolymer monomer, an aqueous system containing substantially no surface activity as an emulsifier can be obtained. It allows emulsion polymerization to be carried out very stably. This significantly improves the deterioration in slipperiness, water resistance, and anti-blocking properties caused by the presence of emulsifiers, which have traditionally been a problem with water-dispersed processing agents.At the same time, the adhesive strength due to the introduction of polar groups has been significantly improved. This enabled significant improvements. However, this does not negate the use of a surfactant when obtaining an aqueous dispersion, if necessary. A preferred composition of the copolymer component for undercoating in the present invention is 99 to 50 mol% of one or more monomers selected from monomer (a), preferably acrylic ester and/or methacrylate. 90 to 70 mol% of acid ester or styrene derivative, 0.5 to 30 mol% of one or more selected from monomer (b),
Preferably, 1 to 20 mol% of hydroxyalkyl ester and/or glycidyl ester of acrylic acid or methacrylic acid, and 0.5 to 20 mol% of one or more selected from monomer (c), preferably , sodium ethylene sulfonate and/or sodium styrene sulfonate 0.5
It is a composition obtained by copolymerizing ~15 mol%. When monomer (a) is 99 mol% or more, monomer (b)
and (c) cannot be provided in the required amount, resulting in insufficient adhesion to the top coating agent for secondary processing.If the amount is less than 50 mol%, it is difficult to obtain good adhesion to the film base. If monomer (b) exceeds 30 mol%, the properties of the obtained undercoat film will be 2.
Although it shows good adhesion to the topcoat for subsequent processing, it shows insufficient adhesion to the film base, and if it is less than 0.5 mol%,
It becomes difficult to obtain the desired effect. Regarding monomer (c), the concentration range is most important; if it exceeds 20 mol%, the hydrophilicity increases too much and it becomes partially water-soluble, making it difficult to disperse the copolymer emulsion. The property is rather unstable, and 0.5 mol%
In the following cases, it becomes difficult to obtain a stable emulsified dispersion in a system substantially free of a surfactant as an emulsifier. The present invention also includes copolymerization of other copolymerizable components without departing from the purpose of the present invention. The appropriate required coating amount of the undercoat copolymer in the present invention is 0.01 mg/dm ² or more 3.0 mg/d in terms of dry weight.
m ² , usually 0.1 to 2.0 mg/dm ² , preferably 0.1 to 1.0 mg/dm ² . In the case of the present invention, the smaller the amount of the undercoat applied, the better the adhesion to the topcoat for secondary processing.
If it exceeds 3.0 mg/dm ² , it becomes difficult to obtain the desired and sufficient performance. Furthermore, although it is said that the smaller the amount, the better the results, if the amount is less than 0.01 mg/dm ² , it is difficult to form a coating film that is sufficient to exhibit its performance, and it is not suitable for the purpose. When a biaxially oriented polyester film is used as the base film, the undercoat composition can be applied before, during, or after the stretching step for compounding. In order to effectively obtain a suitable amount of coating film, it is reasonable to stretch the base film in the longitudinal direction, apply an undercoat, dry it, then stretch it in the right angle direction, and heat-treat it. In addition, in the present invention, a system that does not substantially contain a surfactant as an emulsifier means:
In emulsion polymerization systems, it refers to the surfactant concentration below the critical micelle concentration, which is the concentration at which surfactant micelles are formed, which is the site of polymerization. There is no restriction on the use of even small amounts of surfactants. Depending on the purpose, the undercoat composition of the present invention may also contain inorganic particles, anti-blocking agents such as synthetic and natural waxes, antifoaming agents, PH regulators, viscosity regulators, coloring agents, matting agents, etc. There is no problem in adding additives such as light and heat stabilizers and other various additives. Hereinafter, a more specific explanation will be given with reference to Examples, but it goes without saying that the present invention is not limited only to these embodiments. The undercoating compositions used in Examples and Comparative Examples were prepared as follows. Comparative example composition preparation method (emulsifier addition example) Water was added to a 24-necked flask equipped with a reflux condenser.
600ml, emulsifier (sodium lauryl sulfate)
Add 16 g, one-fifth of the total monomer amount of 400 g, dodecyl mercaptan (chain transfer agent) 0.4 g, and one-fourth of the total amount of catalyst (potassium persulfate) 0.8 g, and while stirring in a nitrogen stream. The temperature was raised to 80℃.
After reacting for 15 minutes while maintaining the temperature,
The remaining monomers and catalyst were added gradually over 1 hour. Thereafter, stirring was continued for another 1 hour at the same temperature to complete the reaction and a milky white liquid latex was obtained. Example composition preparation method: In a flask similar to the comparative example composition preparation method, add water.
650ml Add the entire amount of monomer corresponding to component c, one-fifth of the remaining monomer, 0.35 g of dodecyl mercaptan, and one-fourth of the total amount of catalyst 0.2 g out of the total amount of monomers of 350 g, After raising the temperature to 80° C. while stirring in a nitrogen stream, the remaining monomers and catalyst were gradually added at the same temperature over 1 hour and 30 minutes. Thereafter, stirring was continued for another 1 hour at the same temperature to complete the reaction, and a milky white liquid uniform and stable emulsifier-free latex was obtained. Examples 1 to 3 and Comparative Examples 1 to 4 Table 1 shows the monomer and emulsifier compositions used in these examples and the stability of the obtained polymer dispersions. The monomer and emulsifier abbreviations in Table 1 are as follows. EA: Ethyl acrylate BA: Butyl acrylate MMA: Methyl methacrylate AA: Acrylic acid HEMA: Hydroxyethyl methacrylate GMA: Glycidyl methacrylate SVS: Sodium vinyl sulfonate SSS: Sodium styrene sulfonate SLS: Sodium lauryl sulfate

[Table] *-1 Monomer mol% *-2 Weight % vs. monomer As can be seen from the results in Table-1, both Comparative Examples 1 and 2, which are systems that do not contain an emulsifier or component c, are polymerized. Precipitation occurred during the reaction, making it impossible to obtain a stable aqueous dispersion. Furthermore, in Examples 1 to 3 containing component c, stable aqueous dispersions could be obtained despite the systems not containing an emulsifier. Stable dispersions thus obtained (Examples 1 to 3)
3 and Comparative Examples 3 and 4) were applied to one side of a polyethylene terephthalate biaxially stretched film with a thickness of 50 μm, which had been subjected to corona treatment, using a gravure roll to give a dry solid content of 2 mg/dm ² . ,
Drying and heat treatment were performed to obtain a polyester film coated with an undercoat layer. Table 2 shows various characteristic values of this polyester film coated with an undercoat layer. In the table, the static friction coefficient μS is based on ASTM-1894, and the transparency is based on ASTM-1894.
Measure according to JIS K-6714. The maximum surface roughness (μ) is observed using a microscopic light wave interferometer, and the difference between the highest and lowest parts of the obtained surface unevenness is expressed in μ units. Water resistance was determined by visually observing the appearance of the film coated surface after immersing it in boiling water for 30 minutes.

[Table] As is clear from the results in Table 2, the examples according to the present invention have no surface irregularities and good flatness compared to the unprocessed and emulsifier-containing systems, and the examples with the addition of lubricant. It can be seen that it has much better slipperiness than that obtained by the method, as well as good transparency and water resistance. Next, the surface of the polyester film coated with the undercoat layer was coated with CCST94 ink (manufactured by Toyo Ink Co., Ltd.), a nitrocellulose printing ink, as a topcoat
(manufactured by KK) was applied to a wet thickness of 10 μm using a gravure coater, dried at 85° C. for 2 minutes, and the adhesion of the coated film was tested. The results are shown in Table-3. In the table, adhesiveness was evaluated as follows. ●Cellotape peeling test Paste Nichiban KK's sellotape 24 mm wide on the coated surface so that the length of the adhesive part is 10 cm, rub it strongly, then peel it off strongly at a 180 degree angle, and check the condition of the remaining coated surface as follows. It was determined as follows. ○: Ink does not peel off easily. 〇～△: 80% or more remains without peeling. △: 50 to 80% remains without peeling. △ to ×: 30% to 50% remained without peeling. ×: 70% or more peels off. ●Fir test Cut the sample into a size of 10cm x 15cm, hold both ends in both hands, and rub it firmly.
The condition of the coated surface after rubbing 20 times was evaluated as follows. ○: Ink does not peel off easily. 〇～△: Slightly scratched, but hardly peeled off. △: Partially peeled off. △～×: Almost peels off. ×: It peels off quickly. ●Water resistance test The sample is immersed in boiling water for 1 hour, and after drying, a cellophane tape peel test is performed to examine adhesion.

【table】

[Table] *Corona discharge treated surface of unprocessed film 2 As is clear from Table 3, it can be seen that the present invention has particularly excellent adhesiveness and good water resistance. Examples 4 to 6 and Comparative Examples 5 to 7 Using the aqueous dispersion of the undercoat composition obtained in Example 1, the surface of the polyethylene terephthalate film was coated with various amounts of undercoat as shown in Table 4. gave a membrane. In the table, Examples 6, 7 and Comparative Example 6 are polyester films after biaxial stretching, and Examples 4, 5 and Comparative Example 5 are polyester sheets extruded onto a cast length drum and uniaxially stretched in the longitudinal direction. It was obtained by a method in which the film was immediately applied, further stretched in the transverse direction, and heat-set. The adhesion test was conducted in the same manner as shown in Table 3.

【table】

[Table] From the results in Table 4, it can be seen that the appropriate amount range of the undercoat in the present invention is 0.01 mg/dm ² or more and less than 3.0 mg/dm ² . Examples 7 to 10 and Comparative Examples 8 to 11 The undercoated polyethylene terephthalate films obtained in Examples 4 and 5 were treated at low humidity (40% RH), respectively.
Then, humidity was controlled for 48 hours at 40°C in a desiccator under high humidity (80% RH), and Examples 7 to 10 were
sample was obtained. Furthermore, using the undercoating polyethylene terephthalate film obtained in Comparative Example 6 and the undercoating composition aqueous dispersion obtained in Comparative Example 3, an undercoating polyethylene terephthalate film was prepared in the same manner as in Example 5. Humidity control was performed to obtain samples of Comparative Examples 8 to 11.
Table 5 shows the characteristic values of each sample obtained. Adhesion was evaluated using the same method as in Examples 1 to 3. After applying topcoat ink to the sample immediately after conditioning the humidity, 12 mm wide cellophane tape was attached, and a tensile tester was used to test the sample at 180 mm. The peel force was measured in degrees.

【table】

[Table] As is clear from Table 5, Examples 7 to 10 according to the scope of the present invention both in terms of undercoat composition and coating amount.
Regardless of the storage humidity conditions, both smoothness and transparency showed very good values, and in terms of adhesion, the peeling points were all between the Sellotape←→topcoat layer.
It can be seen that the film←→undercoat layer←→topcoat layer is very strongly adhered and bonded. On the other hand, Comparative Examples 8 and 9, in which the amount of undercoat applied exceeds the range of the present invention, had insufficient adhesive strength.
Partial peeling occurs between the topcoat layer and the undercoat layer, and strong bonding strength is not achieved.
It can also be seen that especially when left under high humidity, the slipperiness and transparency show a slight decrease. Furthermore, in the case of Comparative Examples 10 and 11 in which the undercoat composition contained a surfactant as an emulsifier, even if the coating amount was within the range of the present invention, the slipperiness and transparency were poor, and especially high It can be seen that only extremely poor results are obtained when left in a humid environment. Examples 11 and 12 and Comparative Examples 12 to 15 An aqueous undercoating copolymer dispersion having a monomer composition as shown in Table 6 was prepared by the method described above. The stability of the obtained dispersion liquid is shown in Table-6.
Among these, the dispersion liquid showing good dispersion stability was applied as an undercoat coating agent to one side of a non-oriented polyester sheet extruded onto a casting drum. Immediately after that, the sheet is dried and transversely (widthwise) using a stenter.
The film was stretched 3.5 times, then stretched 3.5 times in the machine direction, and then heat treated to obtain a 25 μm coated polyester biaxially oriented film. The amount of primer coated on the obtained film was approximately 0.25 mg/dm ² . Examples 1 to 3 were applied to this primer-coated polyester film.
A topcoat ink was applied in the same manner as above, and an adhesion test was performed by peeling off cellophane tape. The results are shown in Table-6.

【table】

[Table] As is clear from the results in Table 6, the total amount of component a is less than 50%, and the total amount of component b is 30%.
If the adhesive strength between the polyester film and the undercoat layer exceeds
If it is less than 0.5%, the adhesive strength between the top coat layer and the undercoat layer is insufficient. In addition, component c
It can be seen that when the total amount of is less than 0.5% and more than 20%, it is difficult to obtain good stability of the aqueous acid separation solution. Examples 13, 14 and Comparative Example 16 Isotactic polypropylene was extruded from a T-die onto a casting drum at 250°C and stretched 5 times in the longitudinal direction.
The copolymer composition for undercoating used in No. 12 was applied to one side, immediately stretched 7 times in the transverse direction using a stenter, and heat treated to obtain a coated polypropylene biaxially stretched film having a thickness of 22 μm. The coating amount of the primer on the obtained film was approximately 2 mg/dm ² . Table 7 shows the topcoat ink adhesion of the obtained film.

[Table] From the table, it can be seen that the present invention has excellent topcoat ink adhesion even on polypropylene film.

Claims (1)

[Claims] 1. One or two monomers selected from monomers (a) represented by the following formula on at least one side of a film made of polyester resin or polyolefin resin.
99 to 50 mol% of species or more, 1 selected from monomer (b)
0.5 to 30 mol% of one or more species, and 0.5 to 20 mol% of one or more species selected from monomer (c)
The dry weight of the aqueous dispersion of the copolymer obtained by reacting the monomer mixture containing mol % of each
It is characterized by being obtained by applying it to a concentration of 0.01 mg/dm ² or more and less than 3.0 mg/dm ² and then drying it.
A film with excellent slipperiness and adhesion. (a) [Formula] R ₁ = H or an alkyl group having 1 to 4 carbon atoms R ₂ = An alkyl group having 1 to 8 carbon atoms [Formula] R ₃ = H or an alkyl group having 1 to 4 carbon atoms R ₄ , R ₅ = H or an alkyl group having 1 to 8 carbon atoms (b) [Formula] R ₆ = H or an alkyl group having 1 to 4 carbon atoms R ₇ = H, -(CH ₂ )n-OH, -(CH ₂ ) n-
OR ₈ , -{(CH ₂ )n-O-}m-R ₉ or [Formula] n, m=1-3 R ₈ , R ₉ = C1-C4 alkyl group (c) [Formula] R ₁₀ = H or an alkyl group having 1 to 4 carbon atoms M = H, a monovalent alkali metal or -NH ₄ group [Formula] CH ₂ = CHSO ₂ R ₁₂ R ₁₁ = H or an alkyl group having 1 to 4 carbon atoms R ₁₂ =H or an alkyl group having 1 to 8 carbon atoms [Formula] R ₁₃ , R ₁₄ =H or an alkyl group having 1 to 4 carbon atoms 2 The aqueous dispersion in claim 1 contains substantially no surfactant as an emulsifier. A film characterized by being free of substances. 3. A film characterized in that the polyester resin according to claim 1 is polyethylene terephthalate. 4. A film characterized in that the polyolefin resin according to claim 1 is polypropylene. 5 Components (a), (b) and in Claim 1
The copolymer aqueous dispersion comprising (c) is an emulsion-like aqueous dispersion produced by emulsion polymerization from a system substantially free of a surfactant as an emulsifier. film to do. 6. On at least one side of a film made of polyester resin or polyolefin resin, 99 to 50 mol% of one or more selected monomers (a) and monomer (b) represented by the following formula are added. ) and 0.5 to 30 mol% of one or more selected from
Aqueous dispersion of copolymer obtained by reacting a monomer mixture containing 0.5 to 20 mol% of one or more selected from (c) 0.01 by dry weight
Apply so that mg/dm ² or more and less than 3.0 mg/dm ² .
A method for producing a film with excellent slipperiness and adhesion, which comprises drying, stretching in at least one direction, and then heat-treating. (a) [Formula] R ₁ = H or an alkyl group having 1 to 4 carbon atoms R ₂ = An alkyl group having 1 to 8 carbon atoms [Formula] R ₃ = H or an alkyl group having 1 to 4 carbon atoms R ₄ , R ₅ = H or an alkyl group having 1 to 8 carbon atoms (b) [Formula] R ₆ = H or an alkyl group having 1 to 4 carbon atoms R ₇ = H, -(CH ₂ )n-OH, -(CH ₂ ) n-
OR ₈ , -{(CH ₂ )n-O-}m-R ₉ or [Formula] n, m=1-3 R ₈ , R ₉ = C1-C4 alkyl group (c) [Formula] R ₁₀ = H or an alkyl group having 1 to 4 carbon atoms M = H, a monovalent alkali metal or -NH ₄ group [Formula] CH ₂ = CHSO ₂ R ₁₂ R ₁₁ = H or an alkyl group having 1 to 4 carbon atoms R ₁₂ =H or an alkyl group having 1 to 8 carbon atoms [Formula] R ₁₃ , R ₁₄ =H or an alkyl group having 1 to 4 carbon atoms 7 The aqueous dispersion in claim 6 is a surfactant as an emulsifier. A method for producing a film characterized in that the film is substantially free of. 8 In claim 6, an aqueous dispersion is applied to an unstretched synthetic resin film, and after drying, it is stretched at least twice in the transverse direction using a tenter, then stretched at least twice in the lengthwise direction, and then heat-treated. A method of manufacturing a film characterized by: 9. Claim 6 is characterized in that an aqueous dispersion is applied to a film obtained by stretching an unstretched film twice or more in the machine direction, dried, then stretched in the transverse direction, and then heat-treated. A method of manufacturing a film that is