JPS6025253B2 - Manufacturing method for scratch-resistant synthetic resin molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for continuously producing synthetic resin molded articles with excellent scratch resistance.

Currently, many synthetic resin molded products are on the market, and although they have many excellent properties, they generally have low surface hardening and low resistance to abrasion, so when processing the product,
The surface is easily scratched during transportation, which not only damages the product value, but also causes scratches when wiping and removing dirt such as dirt that adheres to the surface of plastic products with a cloth during use. It is prone to scratches and scratches, and is also susceptible to abrasion caused by collisions with other objects, and in extreme cases, these defects can cause the optical properties to be lost, making it completely unusable. There is a point.

Various methods have been proposed to improve the scratch resistance of these synthetic resin molded products, but the method of attaching a resin film with excellent scratch resistance to the surface of the synthetic resin molded product by some method damages the properties of the resin. This is considered to be the most effective method for making improvements without causing any problems.

Therefore, the present inventors have previously proposed a method for efficiently and continuously manufacturing synthetic resin molded products with excellent scratch resistance by improving these drawbacks (Special Publication No. 491-36829, Special Publication No. 1973). No. 1140567).

However, since the above method uses the opposing surfaces of endless belts running in the same direction and at the same speed as molding surfaces, the cured film formed on the molding surfaces of the endless belts subsequently fills the molding space. Provided to configure
If the cured film reaches the position corresponding to the clamping surface of the gasket on both sides of the supplied endless belt or exceeds the position corresponding to the gasket clamping surface, the cured film is not transferred to the entire surface of the base resin. That is, the hardened film sandwiched between the gasket and the belt remains on the belt when the resin plate that integrates the facilitation film and Motomura resin is peeled off from the belt, or it adheres to the gasket. Further, the cured film located on the outside of the gasket tends to scatter and adhere to the belt when the resin plate is peeled off from the belt. The cured film deposited on the belt in this way may damage the belt surface when the belt moves, or become embedded in the film when the film-forming raw material is applied and cured again. If a flaw occurs on the belt surface in this way, this flaw is directly transferred to the Motomura resin plate. As a result, scratch-resistant spots and optical distortions occur on the surface of the resulting scratch-resistant synthetic resin molded product, which significantly lowers the product price and also reduces the product's walking speed. The present invention was developed after extensive research in view of the above circumstances, and it was discovered that these drawbacks could be solved at once by employing a special method, and the present invention was completed.

That is, the gist of the present invention is that a pair of endless belts running at the same speed in the same direction face each other, and a pair of continuous belts running at the same speed on both sides of the endless A method of forming a molding space with a gasket, forming an abrasion-resistant film on the molding surfaces of the two endless belts, and then injecting a base resin raw material into the molding space and polymerizing the two A scratch-resistant film-forming resin material is applied to at least one molding surface of the endless belt on the inner side of the position corresponding to the sandwiching surface of the gasket and polymerized and cured, and then a base material is applied into the molding space from the upstream end thereof. A scratch-resistant synthetic resin molded product characterized in that a resin raw material is heated and polymerized and cured, and a cured film previously formed on the molded surface is transferred onto a base resin to be polymerized and cured. It's in the manufacturing method.

In the present invention, the thin layer of the scratch-resistant coating formed on at least one forming surface of the endless belt on the inner side of the position corresponding to the sandwiching surface of the gasket is not particularly limited; is 150 or more and has at least two acryloyloxy groups and/or methacryloyloxy groups, or a mixture thereof with other copolymerizable monomers containing 3% by weight or more This is a cured film of a scratch-resistant film-forming resin raw material (hereinafter simply referred to as a film raw material).

These cured films may be formed by pre-polymerizing the above-mentioned film raw material and forming it into a film on the endless belt, or by applying the above-mentioned film raw material onto the forming surface of the endless belt and polymerizing and curing it. It's okay.

In the case of the present invention, the latter method is preferred because it is superior in terms of the thickness of the cured film and its integration with the base resin. The cured film formed on the surface of the endless belt must be formed inside the position corresponding to the sandwiching surface of the gasket on both sides of the endless belt. If it exceeds the position corresponding to the holding surface of the gasket, not all of the cured film will be transferred to the surface of the base resin as described above, resulting in scratch-resistant spots or optical This is undesirable because it causes distortion and greatly reduces the product value. In the present invention, the crosslinked polymerizable compound used as a film raw material contains at least two (meth)acryloyloxy groups, and these groups are preferably residues consisting of aliphatic hydrocarbon groups or derivatives thereof (for example, ether bonds). It is a compound that is bonded by saturated aliphatic hydrocarbon groups).

The main examples of these compounds are esterified products obtained from polyhydric alcohols and (meth)acrylic acid (meaning acrylic acid and/or methacrylic acid, hereinafter the same) or derivatives thereof, or polyhydric alcohols and polyacrylic acids (the same shall apply hereinafter). carboxylic acid and (
It is an esterified product obtained from meth)acrylic acid or its derivatives. Examples of polyhydric alcohols include ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol having an average molecular weight of about 300 to about 1000, propylene glycol, dipropylene glycol, 1,3
-bro/gundiol, 1,3-butanediol, 2,
3-butanediol, 1,4-phthanediol, 1,5
-pentanediol, 1,6-hexanediol, neobentyl glycol (2,2-dimethyl-1,3-propanediol), 2-ethylhexy-1,3-hexanediol, 2,2'-thiodiethanol, Two alcohols such as 1,4-cyclohexanedimethanol, trimethynolpropane (1,1,1-trimethylolpropane), bentaglycerol (1,1,1-trimethylolethane), glycerol, 1,2, Trihydric alcohols such as 4-butanetriol and 1,2,6-hexanetriol, other pentaerythritol (2,2-bishydroxymethyl-1,3-propanediol), diglycerol, diventaerythritol Thor et al.

Examples of particularly preferred polymerizable compounds obtained from these and (meth)acrylic acid include diethylene glycol di(meth)acrylate (meaning acrylate or methacrylate; the same applies hereinafter), triethylene glycol (
meth)acrylate, tetraethylene glycol di(meth)acrylate, 1,4-butanediol di(meth)
Examples include acrylate, 1,6-hexanediol di(meth)acrytrimethylol pro/guntriacrylate, and bentaglycerol triacrylate.

In addition, crosslinking polymerizable compounds obtained from polyhydric alcohols, polycarboxylic acids, and (meth)acrylic acids or their derivatives are basically the hydroxyl groups of polyhydric alcohols, polyhydric carboxylic acids, and (meth)acrylic acids. It is obtained by reacting a mixture such that both carboxyl groups are ultimately equivalent.

Preferred compounds include esterified compounds obtained by using a dihydric alcohol, a trihydric alcohol, or a mixture of a dihydric alcohol and a trihydric alcohol as the polyhydric alcohol, and using a dihydric carboxylic acid as the polyhydric carboxylic acid. can be given.

When using a mixture of three alcohols and a dihydric alcohol, the molar ratio of the trihydric alcohol to the dihydric alcohol can be arbitrarily selected.

Further, the molar ratio of divalent carboxylic acid and (meth)acrylic acid is such that the equivalent ratio of the carboxyl group of the divalent carboxylic acid to the carboxyl group of (meth)acrylic acid is in the range of 2:1 to 0:1. It is preferable. If the divalent carboxylic acid is in excess of the above range, the viscosity of the ester produced becomes too high, making it difficult to form a coating film.

Examples of divalent carboxylic acids include aliphatic dicarboxylic acids such as succinic acid, adipic acid, and sedicic acid; alicyclic dicarboxylic acids such as tetrahydrophthalic acid and 3,6-endomethylenetetrahydrophthalic acid; phthalic acid; isophthalic acid; Aromatic dicarboxylic acids such as terephthalic acid, thiodiglycolic acid, thiodivaleric acid, diglycolic acid, or maleic acid, phthalic acid, itaconic acid, etc., or their chlorides, anhydrides, and esters can be used.

Examples of other copolymerizable monomers that can be used in combination with the crosslinked polymerizable compound of the present invention include (meth)acrylic acid, their esters, acrylonitrile, methacrylonitrile, styrene, and derivatives thereof. Mention may be made of monoethylene unsaturated compounds.

If the amount of the cross-linked polymerizable compound in the film raw material is less than 3% by weight, it is difficult to cure the coated film to the extent that it does not swell with the base resin raw material, and the resulting product is likely to crack. The improvement in scratch resistance is also not remarkable compared to the case of using only the base resin.

When applying and curing the coating raw material on the forming surface of the endless belt, the preferred curing method is to tightly cover the coating with a cover that has no affinity with the coating, perform the first stage of curing of the coating, and then There is a two-step curing method in which the cover is peeled off from above the coating, and then the coating is cured in a second stage in air.

The integral cover used during the first stage of curing has two functions: it facilitates the formation of a uniform and smooth film without leaving any exposed parts on the belt, and it eliminates the polymerization inhibiting effect caused by oxygen in the air. can be given. The reason for dividing the curing of the coating into two stages is that if the coating material is cured to the extent that it does not swell or dissolve with the Motomura resin material while it is tightly covered with the cover, when the cover is peeled off. There is a high risk that the film will adhere to the cover and be removed from the belt, and the curing with the cover in close contact with the cover should be stopped at a stage where there is no risk of the film adhering to the cover.
Subsequently, after peeling off the cover from above the film, it is further exposed to air, and the second stage of curing of the film allows it to be sufficiently cured to the extent that it does not become wet or dissolve depending on the base resin raw material. It depends. If the degree of curing of the film is expressed by the gel fraction using acetone as a solvent, the first stage of curing is in the range of 40 to 90% gel fraction, and the second stage of curing is in the range of 96% or more. It is preferable that it be within. Another preferred curing method when applying and curing the coating raw material is a method in which the coating raw material coated on the belt is sufficiently cured in the air to the extent that it does not swell or dissolve with the base resin raw material. It will be done.

A compound having at least three (meth)acryloyloxy groups in the molecule can be sufficiently cured in air without removing or blocking oxygen. A polymer film such as polyester, polypropylene, cellophane, moisture-proof cellophane, polyethylene, polyvinyl chloride, polyvinyl alcohol, etc. can be used as the cover that is brought into close contact with the coating during the first stage of curing of the coating material. preferable. The polymer film used as the cover body can have a thickness of 0.005 mm to 0.5 mm, but generally when using a polymer film with a thickness of 0.05 mm or less, the polymer film It is preferable to apply a constant tension to the film so that the film does not wrinkle. When applying the coating raw material onto the belt, if a cover body that has no affinity with the coating raw material is used, the coating raw material may be applied directly onto the belt and then the cover may be closely coated, or the cover body may be coated with the cover integrally. After applying the raw material, the cover may be attached to the belt with the coating raw material facing inside. In order to apply the coating raw material onto the belt or integrally with the cover, conventional coating methods such as brush coating, flow coating, spray coating, roll coating, and bar coating can be used. Among these, a roll coating method using a roll having a diameter that is the same as or slightly shorter than that used during the desired application is preferred as a preferred application method because it allows easy control accuracy during application of the coating raw material. When the belt or cover coated with the film raw material is laminated together with the cover or belt, respectively, to form a body, it may be pressed with a press roll. When bonding with a press roll, it is preferable that the outside of the press roll is rubber-lined, and the hardness of the rubber is selected depending on the coating speed and the viscosity of the film raw material, and the thickness of the film and the uniformity of the film thickness are determined. It is preferable to control sex. The thickness of the scratch-resistant coating is about 0.001 to 0.1 inch, particularly preferably about 0.003 to 0.03 inch.

If the film thickness is less than 0.001 mm, it will be difficult to fully achieve the purpose of the present invention, while if the thickness is 0.1 mm or more, it may be transferred to the base resin. In some cases, the resin may become brittle, which is undesirable. Polymerization and curing of the film raw material is carried out in a two-step curing method: the first stage of curing with the cover in close contact with the cover, and the second stage of curing after peeling off the cover.
Furthermore, curing without using a cover can be carried out by any of the usual curing methods, such as hot air conditioning, infrared heating, or photopolymerization by ultraviolet irradiation, but if the simplicity of the curing equipment is considered, , it is preferable to use a photopolymerization method using ultraviolet shelf irradiation.

In the case of photopolymerization using ultraviolet rays, it is preferable to add a photosensitizer having a sensitizing effect in the wavelength range of 4,000 A or less at a rate of 0.1 part by weight per 10 pupil parts of the coating material. , more preferably 0.5 to 10 parts by weight. If the amount of photosensitizer added is less than 0.1 part by weight, the curing speed of the film will be slow and the curing bag will need to be enlarged, which is not preferable. When a film is formed, a decrease in negative resistance is likely to be observed, and a decrease in scratch resistance is also observed, which is not preferable. Specific examples that can be used as photosensitizing barbs include benzoin and penzoin alkyl ether having 1 to 4 carbon atoms. In addition, sources of ultraviolet rays include fluorescent chemical lamps, high-pressure mercury lamps, ultra-high-pressure mercury lamps, arc lamps, xenon lamps, and the like.

The base resin raw material used in the present invention includes, for example, a single rod which is liquid at normal pressure and can be locked-in polymerized, and whose main components are lower alkyl methacrylate, styrene, acrylonitrile, methacrylonitrile, and mixtures thereof. or a partial polymer thereof.

These may be used alone or in combination with other monomers. Preferred monomers used in combination are acrylic acid, methacrylic acid, styrene, and derivatives thereof. In particular, methyl methacrylate or a monomer mixture containing at least 5 pupil % of methyl methacrylate or a partial polymer thereof is the most desirable raw material. When forming a cured film on the inner side of the sandwiching surface of the gasket on the endless belt, the supply of the raw material for the skin film to the belt surface is as follows:
It is necessary to maintain a certain distance from the gasket clamping surface.
That is, 1 to 5 volumes, preferably 5 to 20 volumes, are supplied so as to form a hardened film inside the clamping surface of the gasket.

Cum while supplying film raw materials. The control accuracy varies depending on belt deflection, unevenness, and the viscosity of the coating material, but if the viscosity of the coating material is 10 centipoise or less, the control accuracy during supply will be significantly reduced, and therefore the viscosity of the coating material will be 10 centipoise or less. The above is preferable. Next, the present invention will be explained in detail based on the accompanying drawings. FIG. 1 shows an example of a continuous manufacturing apparatus in which a cover that has no affinity with the film is used. Endless belt 1 located above and below in the same figure
, 1' are each given tension by boleys 2, 3, 2', 3' and are driven to run at the same speed and in the same direction, and each belt is held horizontally by idle rollers 4, 4'. Ru. The coating raw materials 5, 5' are quantitatively supplied to cover units 7, 7' that move at the same speed as the belt by roll coaters 6, 6' whose interiors are narrower than the distance between the inner sides of the sandwiched fin surfaces of the left and right gaskets. It is applied to the belt by press rolls 8, 8' having a diameter narrower than the distance between the inner sides of the gasket clamping surfaces, and is applied within the distance narrower than the distance between the inner sides of the gasket clamping surfaces. The cover body is continuously supplied from an unwinding roll. At that time, the cover unit has rollers 9.9 on both sides that form a constant angle with the direction of movement of the cover unit.
By applying braking torque to the unwinding rolls 10, 10' and the take-up rolls 11, 11', a balanced tension is applied in the traveling direction and the right angle direction to prevent the occurrence of wrinkles. After being prepolymerized in this state by the first-stage curing devices 12, 12', only the cover is peeled off, leaving the film on the belt surface. After only the cover is peeled off, the film is transferred to the second stage curing device 13,1.
3' is post-cured. The base material 14 is fed by a metering pump through an injection bag and between the belt surfaces to which the film is to be applied. At the same time, to seal both sides between the belt surfaces,
A gasket 15 is inserted between the facing surfaces on both sides at the outer side and the pupil of the part where the film is formed, as shown in FIG.

The first half of the polymerization castle is heated by a heater 16 that sprays hot water from outside the belt, and the second half is further heated by a far-infrared heater 17.

When it leaves the polymerization zone and is peeled off from both belt surfaces, a continuous resin plate is obtained in which the cured film and the base resin are integrated, and when the parts on both sides to which the film is not attached are cut out, it is scratch-resistant. A resin plate having a surface is obtained. FIG. 3 illustrates a process in which a cover body is not used when a cured film is attached to an endless belt surface. The difference from FIG. 1 is that a cover is not used and the coating material is applied directly onto the belt. The coating raw materials 5, 5' are applied onto the belt by roll coaters 6, 6' having a diameter narrower than the distance between the inner sides of the gasket clamping surfaces between the left and right gasket clamping surfaces, and It is hardened by hardening devices 13, 13'. Note that the process shown in FIGS. 1 and 3 shows the process of applying a cured film to both surfaces of the base resin, but in the present invention, if necessary, curing may be applied to one side of the endless belt. By omitting the application of a film, it is also possible to produce a synthetic resin molded product having a scratch-resistant film on only one side.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Parts in the examples represent parts by weight. The evaluation of scratch resistance is shown by the increase in ink value using the sand method shown below.

That is, the test piece was tilted in advance at an angle of 4y with respect to the horizontal direction, and the test piece was placed around the vertical axis at an angle of 11R. P. M. The specimen was rotated at a speed of The value represents an increase in the hidden value. The cloud value is expressed by the following formula.

Wing value (%) = total light transmittance - parallel light transmittance
The smaller the increase in IOO cloud value, the better the scratch resistance.

Example 1 Synthesis of film raw material...trimethylolethane 1 mol, 1,6
- Charge 1 mole of hexanediol, 0.5 mole of succinic acid, and 4.4 mole of acrylic acid into a flask, add 27 moles of para-toluene sulfonic acid as a catalyst, 6 moles of dichlorochloride and 2 moles of toluene as a polymerization inhibitor. Heated.

When the internal temperature reached 97%, the water produced by the reaction azeotroped with toluene and began to be taken out of the system, and after 6 hours, 87%
' water was distilled out. Heat the reaction solution in a furnace and add 0.5% sulfuric acid 5
After washing once with 0.00% water and 5 times with 500% water, add 0.23% hydroquinodimonomethyl ether as a polymerization inhibitor.
When toluene was added and toluene was removed, the viscosity was 7 at 20℃.
A liquid of 8 centipoise was obtained. 1.5 parts of penzoin ethyl ether was added to 100 parts of this product and used as a coating material. The experiment was carried out using a continuous manufacturing apparatus shown in FIG.

In Fig. 1, belts 1 and 1' are mirror-polished endless stainless steel belts with a medium diameter of 80 mm and a thickness of 1 willow.
The lower belt is 2.5 lengths longer than the upper belt.

12 per minute by driving the main pulley 2'
The belt is run at a normal speed, and the initial tension of the belt is given by a hydraulic cylinder provided on the tension pulley, and is set to 10 kg per cross section of the belt. The coating material rotates at a circumferential speed of 1 m/min2.
It is coated on a polyester film of 100 mm diameter and 12 microns thick through roll coaters 6 and 6' whose spacing is adjusted to 0 microns. At this time, between the unwinding roller and the take-up roller, rubber-coated rollers 9 and 9' with a diameter of 6 degrees are installed above and below the film at a distance of 20 mm on both sides, and these rollers are aligned 6 degrees in the direction of travel. As the film advances, tension is applied by the rollers in the direction of the film, preventing wrinkles from forming in the film. After that, the inside is removed and the belt is closely adhered to the belt using a press roll with a thickness of 3 layers of neoprene rubber with a 25% compression load of 80 mm and 25% compression applied. Five legs started flowing out. The thickness of the film was 8 microns on the inside of the press roll, and was slightly thicker on the outside.
Next, a 40-watt fluorescent chemical lamp (Matsushita Electric FL)
-4 Fertilizer L) The polyester film is peeled off from the coating after passing through the irradiated area of one 2-kilowatt high-pressure mercury lamp (Toshiba H-200 Mountain). In this way, the upper and lower film-treated belts are placed facing each other, and hollow pipes 15 made of polyvinyl chloride containing a considerable amount of plasticizer are placed on both sides at intervals of 70 arcs at the outer belt position of the film-treated belt. During the sealing process, 77 parts of methyl methacrylate monomer, 2 parts of methyl methacrylate polymer with an average degree of polymerization of 1,800, and 0.065 parts of azobisdimethylvaleronitrile as a polymerization initiator were added to the Motomura resin raw materials. A metering pump supplies V through the infusion device.

Since the total length of the polymerization zone is 3.3, the distance between the belt surfaces is regulated in the first half by a group of idle rollers arranged at 15 rib intervals, and the belt is heated by spraying hot water at 80°C from a nozzle onto the outside surface of the belt. , the second half of the 1.5 skin section has idols arranged at 1 kite intervals.

Support the belt with a roller and heat it to about 130℃ using an infrared heater.
is heated to. When a two-barrel thick resin plate is peeled off from the belt after cooling, all of the film is transferred to the base resin, and when this is cut while the film raw material is being applied, the surface has no irregularities and is scratch resistant with no optical distortion. A resin plate with excellent properties was obtained. Regarding the scratch resistance, the increase in cloud value by the sand drop method was 12%, while the methacrylic resin plate without such treatment was 55%. Comparative Example 1 Except for applying the film raw material on the belt so that it is outside the sandwiching surface of the gasket and curing it in Example 1,
A resin plate was manufactured by repeating the same method as in Example 1.

In this case, the cured film was not transferred to the entire surface of the base resin, and a resin plate with scratch-resistant spots and optical distortion was obtained.

Example 2 The same procedure as in Example 1 was carried out except that the following materials were used as coating raw materials, and the same results as in Example 1 were obtained.

At this time, the increase in ink value using the Fukisa method was also 12%. Using 1 mol of trimethylolethane, 0.5 mol of succinic acid, and 2.2 mol of acrylic acid as raw materials, the same esterification reaction as in Example 1 was carried out. Brome number 100, acid number 8.2
A side KOH/side product was obtained.

To 10 parts of this product were added 10 parts of 1,6-hexanediol diacrylate and 3 parts of benzoin ethyl ether to obtain a liquid with a viscosity of 70 centipoise, which was used as a coating material. . Example 3 Instead of Example 1, 5 parts of 1,6-hexanediol and trimethylene were used as film raw materials.

Using 5 parts of polyethane triacrylate and 1 part of benzoin ethyl ether, the circumferential speed of the roll coater was adjusted to 1 & 2 seconds per minute, and the interval was adjusted to 10 microns. The same procedure as in Example 1 was carried out except that the pieces were glued together using only their own weight. As a result, after the film and belt were bonded together, the coating raw material flowed out from the coating process to the outside by 1 ship on each side, but gaskets were placed at the outer belt position of the film-treated belt at 7 ratio intervals. When both sides are sealed, all of the cured film is transferred to the base resin, and when this is cut during application of the film raw material, a resin plate with excellent scratch resistance and no unevenness on the surface and no optical distortion is created. was gotten.

At this time, the increase in cloud value using the falling sand method was 11%. Example 4 Using 1 mol of trimethylolpropane, 0.5 mol of adipic acid, and 2.2 mol of acrylic acid as raw materials, the same esterification reaction as in Example 1 was carried out.
,000 centipoise, Prom value 102, acid value 10.2
A product of m9KOH/night was obtained.

2 parts of penzoin ethyl ether was added to 10 ml of this product, and this was used as a coating material. On the other hand, a continuous manufacturing apparatus as shown in FIG. 3 was used.

The coating raw material is coated onto the belt by roll coaters 18 and 18' coated with silicone rubber, which rotate at the same speed as the belt.

Afterwards, the coating was applied using a 2 kilowatt high pressure mercury lamp (Toshiba H-200).
dish) pass through one irradiated zone. In this way, the upper and lower film-treated belts were placed facing each other, and the gaskets 15 were used to seal both sides of the film-treated belt at a distance of 7 mm, and the same procedure as in Example 1 was carried out. Ta.

All of the cured film was transferred to the base resin, and if this was cut during application of the film raw material, a resin plate with excellent scratch resistance and no irregularities on the surface was obtained. At this time, the increase in the back price using the falling sand method was 13%.

[Brief explanation of the drawing]

Figure 1 shows an example of continuous production directly from bags when curing the coating using a cover that has no affinity with the coating, and Figure 2 is an enlarged cross-sectional view when the cured coating is integrated with the base resin. FIG. 3 is an example of another continuous manufacturing apparatus in which the coating is cured without using a cover that has no affinity with the coating. 1, 1'... Endless belt, 2, 3, 2', 3'...
...Pulley, 4,4'...Idle roller, 5,5'
...Coating raw material, 6,6'...Roll coater, 7,7'...Cover body, 8,8'...Press roll, 9,9'...Cover body tension roller ,10,
10'... Unwinding the cover body. roller, 11, 11'...cover body winding roller,
12, 12', 13, 13'... Curing device, 1
4... Base resin raw material, 15... Gasket, 16... Heater, 17... Infrared heater, 19, 19'...・Curing film of film raw material. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A molding space is constituted by opposing surfaces of a pair of endless belts that run opposite each other at the same speed in the same direction, and a pair of continuous gaskets that run at the same speed as both endless belts on both sides thereof, and 2. In the method of forming a scratch-resistant film on the molding surface of two endless belts, then injecting a base resin raw material into the molding space and polymerizing the molding surface, A scratch-resistant film-forming resin raw material is applied inside the position corresponding to the sandwiching surface of the gasket and polymerized and hardened, and then a base resin raw material is injected into the molding space from its upstream end and polymerized and hardened. A method for producing a scratch-resistant synthetic resin molded article, characterized in that a cured film previously formed on the molding surface is transferred onto a base resin to be polymerized and cured.