JP2002011739A - Method for continuously manufacturing transparent resin substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide am method for continuously manufacturing a transparent resin substrate having a uniform and flat surface and improved in product yield. SOLUTION: A photopolymerizable monomer composition (A) is supplied on a transferred lower support sheet (20) and an upper support sheet (30) transferred in the same direction at the same speed as the lower support sheet is laminated on the lower support sheet and, thereafter, the photopolymerizable monomer composition (A) is irradiated with active rays to be cured to continuously manufacture the transparent resin substrate. Prior to peeling both support sheets, the lug parts of both end parts in the longitudinal direction of the cured sheetlike photopolymerizable monomer composition (A) are cut by a lug part cutter (5).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously manufacturing a transparent resin substrate, and more particularly, to a method for continuously manufacturing a transparent resin substrate having a uniform and flat surface and improved product yield. About.

[0002]

2. Description of the Related Art Transparent resin substrates are industrially used for various applications such as display substrates for liquid crystal and organic EL, optical filters, optical communication materials, and solar cell substrates. Such a transparent resin substrate supplies the photopolymerizable monomer composition onto the transferred lower support sheet, and stacks thereon the upper support sheet transferred in the same direction at the same speed as the lower support sheet, The photopolymerizable monomer composition can be manufactured continuously by irradiating the photopolymerizable monomer composition with an actinic ray and curing, and then peeling off both support sheets. Usually, a synthetic resin sheet is used for the above-mentioned support sheet.

In the above method, the photopolymerizable monomer composition supplied onto the lower support sheet and formed into a sheet shape is laminated with the photopolymerizable monomer composition thereon and pressed. Some swelling occurs in the part. After the support sheet has been peeled off, such raised portions (ear portions) are cut and removed together in a commercialization step of cutting into a predetermined size. However, according to such a method, there is a problem that the product is damaged at the time of cutting the ear portion and the product yield is reduced.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a continuous transparent resin substrate having a uniform and flat surface and an improved product yield. It is an object of the present invention to provide a production method.

[0005]

As a result of various studies to achieve the above object, the present inventors surprisingly cut off the ears before peeling off both support sheets, ie, It has been found that if the ears are cut together with the sheet, breakage of the product is prevented and the above object can be easily achieved, and the present invention has been completed.

That is, the gist of the present invention is to supply a photopolymerizable monomer composition onto a transferred lower support sheet, and to stack an upper support sheet transferred in the same direction at the same speed as the lower support sheet. Then, a continuous production method of a transparent resin substrate to be cured by irradiating the photopolymerizable monomer composition with actinic rays, prior to the separation of the two support sheets,
The present invention resides in a continuous production method of a transparent resin substrate, characterized by cutting the lugs at both ends in the longitudinal direction of the cured sheet-shaped photopolymerizable monomer composition.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an explanatory view of a preferred example of a manufacturing facility for carrying out the present invention.

First, the photopolymerizable monomer composition used in the present invention will be described. The photopolymerizable monomer composition used in the present invention is composed of a polymerizable monomer, a photopolymerization initiator, and any other components.

The above-mentioned polymerizable monomer is not particularly limited as long as it is a monomer capable of forming a transparent resin by being polymerized and cured by irradiation with actinic rays such as ultraviolet rays, and various monomers can be used. . Typically, various acrylate compounds, for example, epoxy acrylate, urethane acrylate, polyester acrylate, polyether acrylate, oligomers of these, or combinations of these with other polymerizable monomers, and the like can be given.

In the present invention, an alicyclic skeleton bis (meth) acrylate represented by the following general formula (I) and a general formula (II) represented by the following general formula (I) from the viewpoint of chemical resistance and rigidity. A combination of an alicyclic skeleton mono (meth) acrylate is preferable, and a combination of these with a bifunctional mercapto compound described below is particularly preferable. In addition, "(meth) acrylate" is a general term including acrylate and methacrylate.

[0011]

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In the general formula (I), R ¹ and R ² each independently represent a hydrogen atom or a methyl group, m is an integer of 1 or 2, n is an integer of 0 or 1, p and q are And each independently represents any integer of 0 to 3.

Specific examples of the alicyclic skeleton bis (meth) acrylate represented by the above formula (I) include, for example, bis (oxymethyl) tricyclo [5.2.1.0 ^2,6 ] decane = Diacrylate, bis (oxymethyl) tricyclo [5.2.1.0 ^2,6 ] decane = dimethacrylate,
Bis (oxymethyl) tricyclo [5.2.1.
0 ^{2, 6]} decane = acrylate methacrylate and mixtures thereof, bis (oxymethyl) pentacyclo [6.
5.1.1 ^3,6 . 0 ^2,7 . 0 ^9,13 ] pentadecane diacrylate, bis (oxymethyl) pentacyclo [6.
5.1.1 ^3,6 . 0 ^2,7 . 0 ^9,13 ] pentadecane dimethacrylate, bis (oxymethyl) pentacyclo [6.
5.1.1 ^3,6 . 0 ^2,7 . 0 ^9,13] pentadecane = acrylate methacrylate and mixtures thereof, bis (oxymethyl) tricyclo [5.2.1.0 ^{2, 6]} decane =
Diacrylate, bis (oxymethyl) tricyclo [5.2.1.0 ^2,6 ] decane = dimethacrylate, bis (oxymethyl) tricyclo [5.2.1.0 ^2,6 ]
Decane = acrylate methacrylate and mixtures thereof;

[0014]

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In the general formula (II), R ³ represents a hydrogen atom or a methyl group, m is an integer of 1 or 2, n is an integer of 0 or 1, r and s are each independently 0 to 3 Represents an integer.

Specific examples of the alicyclic skeleton mono (meth) acrylate represented by the general formula (II) include, for example,
Bis (oxymethyl) tricyclo [5.2.1.
0 ^2,6] decane = monoacrylate, bis (oxymethyl) tricyclo [5.2.1.0 ^{2, 6]} decane = monomethacrylate and mixtures thereof, bis (oxymethyl) pentacyclo [6.5.1. ^13-6 . 0 ^2,7 .
0 ^9,13 ] pentadecane monoacrylate, bis (oxymethyl) pentacyclo [6.5.1.1 ^3,6 . 0 ^2,7 .
0 ^9,13 ] pentadecane monomethacrylate and mixtures thereof, bis (oxymethyl) tricyclo [5.2.
1.0 ^2,6 ] decane = monoacrylate, bis (oxymethyl) tricyclo [5.2.1.0 ^2,6 ] decane = monomethacrylate, and mixtures thereof.

The bifunctional mercapto compounds used in combination with the alicyclic skeleton bis (meth) acrylate and the alicyclic skeleton mono (meth) acrylate include mercapto compounds represented by formulas (III) to (V). Compounds are preferred.

[0018]

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In the general formula (III), R ⁴ represents a methylene group or an ethylene group; R ⁵ represents a hydrocarbon residue having 2 to 15 carbon atoms which may contain ether oxygen;
Indicates an integer.

In the general formula (III), R ⁵ (a hydrocarbon residue having 2 to 15 carbon atoms which may contain an ether oxygen)
Specific examples include a pentaerythritol residue, a dipentaerythritol residue, a trimethylolpropane residue, an ethylene glycol residue, a diethylene glycol residue, a triethylene glycol residue, and a butanediol residue.

The mercapto compound represented by the general formula (III) is a di- to hexavalent thioglycolate or thiopropionate, and specific examples thereof include pentaerythritol tetrakis (β-thiopropioate). Pentaerythritol tetrakis (thioglycolate), trimethylolpropane tris (β-thiopropionate), trimethylolpropane tris (thioglycolate), ethylene glycol bis (β-
Thiopropionate) and the like.

[0022]

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In the general formula (IV), X is HS- (CH ₂ ) _b -CO- (O
CH ₂ CH ₂ ) _d- (CH ₂ ) _c- . Here, b and c each independently represent an integer of 1 to 8.

The mercapto compound represented by the general formula (IV) is an isocyanurate containing an ω-thiol group, and specific examples thereof include tris [2- (β-thiopropionyloxy) ethyl] isocyanurate and tris (2
-Thioglyconyloxyethyl) isocyanurate, tris [2- (β-thioglyconyloxyethoxy) ethyl] isocyanurate, tris [(2-thioglyconyloxyethoxy) ethyl] isocyanurate, tris [3- (β -Thiopropionyloxy) propyl] isocyanurate, tris (3-thioglyconyloxypropyl) isocyanurate and the like.

[0025]

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In the general formula (V), R ⁶ and R ⁷ each independently represent an alkylene group, e and f each independently represent an integer of 0 or 1, and g represents an integer of 1 or 2. .

The compound represented by the general formula (V) is a thiol group-containing hydrocarbon, and specific examples thereof include, for example,
Benzene mercaptan, xylylene mercaptan, 4,
4'-dimercaptodiphenyl sulfide and the like.

In the present invention, each of the above components is usually
Used in the following proportions: That is, the alicyclic skeleton bis (meth) acrylate represented by the general formula (I) is 70 to
99 parts by weight, 1 to 30 parts by weight of the alicyclic skeleton mono (meth) acrylate represented by the general formula (II), and 100 parts by weight of the above, and the above general formulas (III) to (V)
The mercapto compound represented by the formula is 1 to 10 parts by weight.

The photopolymerization initiator is not particularly limited as long as radicals can be generated by irradiation with actinic rays, and various photopolymerization initiators can be used. Typically, various acetophenone-based or benzophenone-based photopolymerization initiators can be used.

Specific examples of the acetophenone-based photopolymerization initiator include, for example, 1-phenyl-2-hydroxy-2-methylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 4-diphenoxydichloroacetophenone, and the like. Examples of the above-mentioned benzophenone-based photopolymerization initiator include benzophenone, methyl benzoylbenzoate, 4-phenylbenzophenone, and hydrohashibenzophenone.

In the present invention, the following general formula (X
The compound represented by I) can also be suitably used as a photopolymerization initiator.

[0032]

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In the general formula (VI), R ⁸ represents a methyl group, a methoxy group or a chlorine atom, and n represents an integer of 2 or 3.

Specific examples of the compound represented by the above general formula (VI) include, for example, 2,6-dimethylbenzoyldiphenylphosphine oxide, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 2,4,6
Examples thereof include 6-trimethylbenzoylphenylphosphinic acid methyl ester and 2,6-dichlorobenzoylphenylphosphine oxide.

The above photopolymerization initiator is used in an amount of usually 0.01 to 1 part by weight, preferably 0.1 to 1 part by weight, based on 100 parts by weight of the monomer.
It is used in a ratio of 02 to 0.3 parts by weight.

In the present invention, as other optional components, other polymerizable monomers capable of radical polymerization, a thickener,
Thermal polymerization initiators, antioxidants, ultraviolet absorbers, dyes and pigments can be used.

Examples of other radically polymerizable monomers include methacryloyloxymethylcyclodecane, 2,2-bis [4- (β-methacryloyloxyethoxy) phenyl] propane, and 2,2-bis [4-
(Β-methacryloyloxyethoxy) cyclohexyl] propane, 1,4-bis (methacryloyloxymethyl) cyclohexane and the like. These polymerizable monomers are based on 100 parts by weight of the aforementioned polymerizable monomer.
Usually, it is used in a proportion of 30 parts by weight or less.

The thickener is appropriately selected depending on the type of the polymerizable monomer used, but usually, an amorphous thermoplastic polymer is used. In particular, the following general formula (VII) or (VII
Amorphous polyolefins represented by I) are preferred.

[0039]

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In the general formula (VII), X represents cyclopentadiene and a derivative thereof, norbornadiene and a derivative thereof, dicyclopentadiene and a derivative thereof, or a hydrogenated product thereof, and R ⁹ represents a hydrogen atom, a hydrocarbon or a hydrocarbon. It represents a group or a C ₆ H ₄ R ¹⁰ group, R ¹⁰ is a hydrogen atom, a hydrocarbon group, an alkoxy group, a halogenated hydrocarbon group or a halogen atom, d and e are each independently an integer of 1 or more Is shown.

[0041]

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In the general formula (VIII), j and k each independently represent 0 or an integer of 1 or more. Further, the cyclic 5-membered ring unit may have a substituent such as a halogen atom or a hydrocarbon group.

Specific examples of the above-mentioned amorphous polyolefin are described in JP-A-10-77321, which can be referred to. In the present invention, as other amorphous polyolefins, bicyclo [2.2.1] hept-2-ene or a derivative thereof described in the above-mentioned publication and cyclopentene, cyclooctene,
A ring-opened polymer with another cyclic olefin such as 1,5-cyclooctentadiene or a hydrogenated product thereof can also be used.

Further, in the present invention, the following general formula (I)
The compound represented by X) can also be suitably used as a thickener.

[0045]

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In the general formula (IX), Y represents an alkoxy group such as methoxy, ethoxy and isopropoxy, and h represents an integer of 1 or more.

The above thickener is used in an amount of usually 2 to 10 parts by weight, preferably 4 to 8 parts by weight, based on 100 parts by weight of the monomer.

The photopolymerizable monomer composition used in the present invention is prepared by blending the above components, is a non-solvent system, and has a viscosity at 20 ° C. and a shear rate of 10 sec.
As a value measured under the condition of c- ¹ , usually 500 to 100
000 mPa · sec, preferably 1000 to 1000
The range is 0 mPa · sec.

Examples of the above-mentioned thermal polymerization initiator include benzoyl peroxide, diisopropyl peroxycarbonate, t-butylperoxy (2-ethylhexanoate) and the like, and the amount thereof is based on 100 parts by weight of the monomer. , Usually 1 part by weight or less. In addition, known antioxidants, ultraviolet absorbers, and dyes and pigments can be appropriately selected and used.

In the production method of the present invention, basically, the photopolymerizable monomer composition is supplied onto the lower support sheet to be transferred, and the upper portion is transferred thereon at the same speed as the lower support sheet in the same direction. This is a method for continuously producing a transparent resin substrate in which a support sheet is laminated and then the photopolymerizable monomer composition is irradiated with active rays and cured. Such a method can be performed in a manufacturing facility as shown in FIG.

Further, according to the above-mentioned manufacturing equipment, the pre-curing step of irradiating the lower support sheet and / or the upper support sheet with active rays and irradiating the active rays after peeling off both support sheets. A preferred embodiment of the present invention comprising a subsequent post-curing step can be practiced. That is, according to such an aspect, the problem caused in the case of the method of peeling both support sheets after curing is completed, that is,
By irradiating with actinic radiation, a transparent resin having a more uniform and flat surface, avoiding the problem that the support sheet thermally shrinks and causes a gap between the support sheet and the photopolymerizable monomer composition formed into a sheet shape A substrate can be manufactured.

In FIG. 1, the lower support sheet (20)
Is sent out from the lower support sheet feeding device (21),
Drive roller (22), guide rollers (23) and (24)
Through the lower support sheet winding device (25). On the other hand, the upper support sheet (30) is sent out from the upper support sheet feeding device (31), and the guide rollers (3
2) Via (33) and (34), it is wound by the upper support sheet winding device (35). Guide rollers (23) and (24) arranged on the lower support sheet side and guide rollers (33) and (34) arranged on the upper support sheet side
Are arranged facing each other.

The lower support sheet (20) and the upper support sheet (30) are both made of a flexible sheet, and the sheet on the irradiation side of the actinic ray described later is made of a transparent sheet. Also, usually 10 to avoid softening by heat during polymerization.
It is composed of a sheet having a softening point of 0 ° C. or higher. Examples of the sheet having such characteristics include a synthetic resin sheet having a thickness of 50 to 300 μm, for example, a synthetic resin sheet such as polyethylene terephthalate, polyethylene naphthalate, and polycarbonate. The surface roughness (Ra) of the side of the support sheet in contact with the photopolymerizable monomer composition is usually 10
0 nm or less, preferably 20 nm or less. By using such a support sheet, a transparent resin substrate having a smoother surface can be obtained.

The lower support sheet (20) and the upper support sheet (30) are transported in the same direction at the same speed, and a horizontal path line is formed between the drive roller (22) and the guide rollers (23) and (24). Is formed. The transfer speed of the sheet is usually 0.5 to 20 m / min, preferably 1 to 10 m / min.
m / min.

Then, from the die coater (1) arranged near the driving roller (22), the lower support sheet (2) is moved.
0) The photopolymerizable monomer composition (A) is supplied thereon, and the upper support sheet (30) is laminated thereon. Then, the photopolymerizable monomer composition is irradiated with active rays and cured.

The photopolymerizable monomer composition (A) supplied from the die coater (1) onto the lower support sheet (20)
Is appropriately adjusted depending on the supply speed and the sheet transfer speed, but is usually 0.1 to 5 mm. The upper support sheet (30) does not need to be particularly pressurized, and is supplied on the lower support sheet (20) and is uniformly laminated on the photopolymerizable monomer composition (A) formed into a sheet. What is necessary is just to be pressed. As a light source for the active ray, a chemical lamp, a xenon lamp, a low-pressure mercury lamp, a high-pressure mercury lamp, a metal halide lamp, or the like is used.

In a preferred embodiment of the present invention, firstly, the active ray irradiation equipment (4) for the pre-curing step is used to irradiate an active ray, and then both support sheets (20) and (30) are respectively wound into respective winding devices. After peeling in (25) and (35), irradiation with active rays is performed in the active ray irradiation equipment (6) for the post-curing step. In the case of the manufacturing facility shown in FIG. 1, the irradiation of active rays is performed from both sheet surfaces in both steps, but may be performed from one sheet surface.

In the above first curing step, usually 5 to 85% by weight, preferably 20 to 60% by weight of the photopolymerizable monomer is polymerized, and in the second curing step, the remaining photopolymerizable monomer is polymerized. . The following conditions are recommended as curing conditions.

That is, the irradiation intensity of the active ray is about 60 to 200 w / cm in both steps, and the irradiation time is 0.5 to 3 minutes in the former curing step and 2 to 5 minutes in the latter curing step. . The irradiation amount is determined by the relationship between the irradiation intensity and the irradiation time, but it is preferable to increase the irradiation amount in the subsequent curing step. The irradiation amount in the latter curing step is usually 1.5 to 20 times, preferably 5 to 10 times that of the former curing step. The temperature of the photopolymerizable monomer composition (A) is as follows:
The temperature is raised by the heat of polymerization. In the case of the present invention, the temperature of the photopolymerizable monomer composition (A) is about 100 to 150 ° C. in the first curing step and about 1 in the second curing step by an appropriate cooling means.
It is preferable to control the temperature in the range of 40 to 180 ° C. Such temperature control suppresses a decrease in physical properties of the product (such as transparency, strength, and homogeneity). In addition, as the actinic ray irradiation equipment, commercially available equipment can be used, but the atmosphere of the post-curing step is preferably an inert atmosphere such as nitrogen. The atmosphere in the first curing step may be an air atmosphere.

In the case of the present invention, in the subsequent curing step,
A tension of 0.2 to 1 N / cm ² is applied in the length direction to the polymer sheet (transparent resin substrate before completely cured) obtained in the first-stage curing step, and 1/5 of the longitudinal direction in the width direction. ~ 3/4
Is preferably applied. According to the post-curing step in such an embodiment, distortion (undulation) of the polymer sheet is prevented,
An even flatter transparent resin substrate can be obtained. As a method of applying tension in the length direction and the width direction of the polymerized sheet, for example, a tenter clip method in which a large number of continuous clips are pulled across an ear portion and run can be adopted.

The most important feature of the present invention is that the edges of both ends in the longitudinal direction of the cured sheet-shaped photopolymerizable monomer composition are cut prior to the peeling of the two support sheets. That is, in the case of the manufacturing equipment shown in FIG. 1, the ear cutting cutter (5) arranged between the actinic ray irradiation equipment (4) for the pre-curing step and the actinic ray irradiation equipment (6) for the post-curing step. Thus, the ears are cut off before the support sheets (20) and (30) are peeled off by the respective winding devices (25) and (35). A laser cutter is suitably used as the ear cutting cutter (5). The ear part cut and removed together with the support sheet is wound around an ear winding roller (not shown).

After the completion of the above-mentioned second curing step, the obtained transparent resin substrate is cut by an appropriate means to obtain a transparent resin substrate product (B). In the present invention, heat treatment can be performed, if necessary, after the completion of the second-stage curing step and before the above-described cutting treatment. Such a heat treatment has a meaning as a finish of the polymerization treatment. The heat treatment temperature is usually 1
50 to 200 ° C, preferably 150 to 170 ° C,
The heat treatment time is usually 0.5 hour or more, preferably 0.5 hour or more.
~ 2 hours. The atmosphere may be either an inert atmosphere or an air atmosphere.

Although not shown, a belt conveyor can be provided in the subsequent curing step. in this case,
Normally, post-stage curing is performed only by the actinic ray irradiation equipment arranged above the belt conveyor. In the case of the manufacturing equipment shown in FIG. 1, the lower support sheet (20) also serves as a belt conveyor, but the belt conveyor is arranged below the lower support sheet (20), and the lower support sheet is placed on the belt conveyor. (20) may be transported. Furthermore,
One support sheet (preferably, the lower support sheet) is made of a seamless endless steel sheet, and the cost can be reduced by reducing the amount of the synthetic resin sheet discarded after use as the support sheet.

The transparent resin substrate obtained by the method according to the present invention has an excellent light transmittance, which is usually 75%.
Or more, preferably 80% or more. Further, the thickness of the transparent resin substrate varies depending on its use, but is usually 0.1 to
5 mm, preferably 0.2-1 mm.

The transparent resin substrate obtained as described above is
It is suitably used for various uses such as display substrates such as liquid crystal and organic EL, optical filters, optical communication materials, and solar cell substrates.

[0066]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist of the present invention.

Example 1 <Preparation of photopolymerizable monomer composition> Bis (oxymethyl) tricyclo [5.2.1.0 ^2,6 ] decane = 94% by weight of diacrylate and pentaerythritol tetrakis (β-thiopro 100% mixture with 6% by weight of pionate)
With respect to parts by weight, 0.05 parts by weight of benzophenone and 0.05 parts by weight of 2,4,6-trimethylbenzoyldiphenylphosphine oxide are used as a photopolymerization initiator, and "ZEONEX450" (manufactured by Zeon Corporation) as a thickener is used. 3 parts by weight of a hydrogenated product of a ring-opening polymer)
A photopolymerizable monomer composition having a viscosity of 3000 mPa · sec was prepared.

<Production Equipment for Transparent Resin Substrate> The same production equipment as shown in FIG. 1 was used. Lower support sheet (20)
And the upper support sheet (30) has a width of 330 mm and a thickness of 1 mm.
00 μm polyester sheet (“O300” manufactured by Mitsubishi Chemical Polyester), actinic ray irradiation equipment (4) and (6)
, A water-cooled 25 W carbon dioxide laser (manufactured by Quantum Electronics Co., Ltd.) was used for the ear cutting cutter (5).

<Manufacture of Transparent Resin Substrate> First, the transfer speed of the lower support sheet (20) and the upper support sheet (30) was set to 1 m / min, and photopolymerization was performed on the lower support sheet (20) from the die coater (1). The reactive monomer composition (A) was supplied, and formed into a sheet having a width of 310 mm and a thickness of 400 μm.

Next, the actinic ray irradiation equipment for the pre-curing step
(4) 2 J / cm for 0.5 minutes ^TwoIrradiation
Was. At this time, the temperature of the photopolymerizable monomer composition (A) is
The temperature was kept at 130 ° C. by air cooling. By the way, in the first stage curing
About 60% by weight of the photopolymerizable monomer is polymerized.
Was.

Next, the ear portion was cut off at a position of 20 mm from both ends by an edge cutting cutter (5) and removed.
Both support sheets (20) with the winding devices (25) and (35)
And (30) were peeled off.

Then, irradiation was performed at 25 J / cm ² for 5 minutes by the actinic ray irradiation equipment (6) for the post-curing step. At this time, the temperature of the photopolymerizable monomer composition (A) is
The temperature was maintained at 160 ° C. by air cooling. Thereafter, the product was cut into a predetermined length to obtain a transparent resin substrate product (B).

The transparent resin substrate was continuously manufactured for 50 minutes until a transparent resin substrate product of about 50 m was obtained. During that time, the transparent resin substrate product (B) did not break.

Comparative Example 1 In Example 1, as the production equipment for the transparent resin substrate, equipment was used in which an active ray irradiation equipment (6) for the post-curing step was followed by an ear cutting cutter (5). A transparent resin substrate product (B) was obtained in the same manner as in Example 1, except that the ears were cut after the support sheets (20) and (30) were peeled off. During the continuous production for 50 minutes, the transparent resin substrate product (B) was damaged 10 times.

[0075]

According to the present invention described above, a method for continuously manufacturing a transparent resin substrate having a uniform and flat surface and improved product yield is provided. Is remarkable.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a preferred example of a manufacturing facility for carrying out the invention.

[Explanation of symbols]

 1: Die coater 4: Active ray irradiation equipment for pre-curing process 5: Cutter for cutting ear 6: Active ray irradiation equipment for post-curing process 20: Lower support sheet 21: Lower support sheet feeding device 22: Drive roller 23: Guide roller 24: Guide roller 25: Lower support sheet take-up device 30: Upper support sheet 31: Upper support sheet feed device 32: Guide roller 33: Guide roller 34: Guide roller 35: Upper support sheet take-up device A: Light Polymerizable monomer composition B: Transparent resin substrate product

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29L 7:00 B29L 7:00 C08L 57:00 C08L 57:00 (72) Inventor Mitsuru Ishihara Yokkaichi, Mie Prefecture 1 Tohocho Mitsubishi Chemical Corporation Yokkaichi Office F-term (reference) 4F071 AA33 AF29 AF30 AH12 AH19 BA02 BB02 BB12 BC01 BC03 BC08 4F073 AA05 AA07 BA18 BB01 CA45 FA03 HA09 HA11 4F204 AA43 AA44 AG03 AE02 AR03 AE03 EF01 EF36 EK04 EW02 EW06 EW23 EW34 4J011 AA04 AA05 AC04 BB10 CA08 CC10 QA03 QA45 SA01 SA22 SA26 SA29 SA61 SA84 TA02 TA03 UA01 VA01 VA02 WA07

Claims (4)

[Claims] 1. A photopolymerizable monomer composition is supplied onto a transferred lower support sheet, and an upper support sheet transferred in the same direction at the same speed as the lower support sheet is laminated thereon. A continuous method for producing a transparent resin substrate, which is cured by irradiating the monomer composition with actinic radiation, prior to the peeling of the two support sheets, at both ends in the longitudinal direction of the cured sheet-shaped photopolymerizable monomer composition. A method for continuously manufacturing a transparent resin substrate, characterized by cutting ears. 2. The method according to claim 1, wherein the cutting of the ears is performed by a laser cutter. 3. A pre-curing step of irradiating an active ray through a lower support sheet and / or an upper supporting sheet, and a post-curing step of irradiating an actinic ray after peeling off both support sheets. 3. The production method according to 1 or 2. 4. The method according to claim 3, wherein 5 to 85% by weight of the photopolymerizable monomer is polymerized in the first curing step, and the remaining photopolymerizable monomer is polymerized in the second curing step.