KR102352437B1 - Laminated sheet - Google Patents

Abstract

An object of the present invention is to provide a laminated sheet excellent in workability in which there is no whitening caused by organic solvents and cracks due to molding process do not occur.
a first polycarbonate layer, a first adhesive layer, a polarizing film layer, a second adhesive layer, and a second polycarbonate layer;
The first adhesive layer is laminated on the first surface of the polarizing film layer, and the second adhesive layer is laminated on the second surface,
In the first adhesive layer, a first polycarbonate layer is laminated on a surface opposite to the surface on which the polarizing film layer is laminated, and in the second adhesive layer, a surface opposite to the surface on which the polarizing film layer is laminated. It is a laminated sheet in which a second polycarbonate layer is laminated,
The laminated sheet in which a swelling layer exists between the first polycarbonate layer and the first adhesive layer and/or between the second adhesive layer and the second polycarbonate layer is whitening caused by an organic solvent There is no crack, and cracks due to molding do not occur, so the workability is excellent.

Description

Laminated sheet {LAMINATED SHEET}

The present invention relates to a laminated sheet having light polarizing properties and a method for manufacturing such a laminated sheet.

Conventionally, in order to block the light reflected by sunlight on water surface, eyes, etc., the polarizing sunglasses provided with polarization property are known. As a member of the polarizing sunglasses, a laminated sheet in which a transparent resin sheet is laminated on both sides of a polarizing film through an adhesive is used, and as the resin sheet, a resin generally containing triacetyl cellulose, polymethyl methacrylate, etc. A sheet is used, and a resin sheet containing polycarbonate is used in order to improve impact resistance and heat resistance.

Here, when an organic solvent such as an ester solvent, a ketone solvent, or an aromatic hydrocarbon solvent is included in the adhesive used for bonding the resin sheet containing the polycarbonate and the polarizing film, the polycarbonate is Since the solvent resistance is low, the organic solvent erodes the polycarbonate, causing whitening. This whitening becomes a cause of the transparency fall of a laminated sheet, and deteriorates an external appearance. Then, when adhering the resin sheet containing a polycarbonate and a light-polarizing film, examination of the adhesive agent which can prevent whitening is made|formed.

For example, in Patent Document 1, an alcohol-soluble ultraviolet curable adhesive layer formed of an alcohol solution of an ultraviolet curable resin is provided between the polycarbonate plate and the polarizing film in order to prevent a decrease in transparency due to this whitening, A method for preventing the erosion of organic solvents into polycarbonate plates has been proposed.

In addition, as a method of preventing whitening caused by an organic solvent, there is a method in which an adhesive sheet in which the amount of solvent is suppressed is prepared in advance, and the adhesive sheet and the polycarbonate sheet are adhered.

Japanese Patent Laid-Open No. 2-99055

However, in the method described in Patent Document 1, whitening caused by an organic solvent can be prevented, but when the laminated sheet obtained by this method is subjected to molding processing such as bending, the adhesive sheet layer and polycarbonate There is a problem that cracks are generated inside the polycarbonate at the interface of , due to the force generated during processing.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a laminated sheet excellent in workability, in which there is no whitening caused by an organic solvent and cracks due to molding do not occur.

As a result of earnest research by the present inventors, in a laminated sheet comprising a polycarbonate layer, an adhesive layer, and a polarizing film layer in this order, between the polycarbonate layer and the adhesive layer, a polycarbonate layer is formed with an organic solvent. It was found that, by providing a swelling layer produced by swelling the bonate, a laminated sheet excellent in workability that does not whiten caused by an organic solvent and cracks due to molding processing does not occur, can be obtained, and the present invention is completed. reached the

That is, the present invention is as follows.

[One]

a first polycarbonate layer, a first adhesive layer, a polarizing film layer, a second adhesive layer, and a second polycarbonate layer;

The first adhesive layer is laminated on the first surface of the polarizing film layer, the second adhesive layer is laminated on the second surface,

In the first adhesive layer, a first polycarbonate layer is laminated on a surface opposite to the surface on which the polarizing film layer is laminated, and in the second adhesive layer, a surface opposite to the surface on which the polarizing film layer is laminated. It is a laminated sheet in which a second polycarbonate layer is laminated,

and a swelling layer is present between the first polycarbonate layer and the first adhesive layer and/or between the second adhesive layer and the second polycarbonate layer.

[2]

The laminated sheet according to [1], wherein the polarizing film layer contains at least one selected from the group consisting of polyvinyl alcohol and olefin-vinyl alcohol copolymer.

[3]

The laminated sheet according to [1] or [2], wherein the swelling layer has a thickness of 1 to 30 µm.

[4]

The laminated sheet according to any one of [1] to [3], for use in sunglasses, goggles, or corrective lenses.

[5]

(1) a step of coating the surface of the polycarbonate film with a varnish containing an organic solvent for swelling the polycarbonate and an adhesive;

(2) after the step (1), drying the varnish coated on the surface of the polycarbonate film to form an adhesive layer;

(3) The process of bonding a polarizing film and the said adhesive bond layer after the process of said (2);

A method for producing a laminated sheet comprising a.

[6]

The method for producing a laminated sheet according to [5], wherein the solid content concentration in the varnish is 20.0 to 70.0 mass%.

[7]

The method for producing a laminated sheet according to [5] or [6], wherein the drying conditions are 3 to 5 minutes at 70 to 130°C.

[8]

The method for producing a laminated sheet according to any one of [5] to [7], wherein the thickness of the adhesive layer after the step of drying the varnish is 5 to 30 µm.

[9]

(1) a step of coating the surface of the polycarbonate film with an organic solvent causing the polycarbonate to swell;

(2) after the step (1), a step of laminating an adhesive film on the surface of the polycarbonate film coated with the organic solvent to form an adhesive layer;

(3) The process of bonding a polarizing film and the said adhesive bond layer after the process of said (2);

A method for producing a laminated sheet comprising a.

[10]

The laminated sheet according to any one of [5] to [9], wherein the organic solvent for swelling the polycarbonate is at least one selected from the group consisting of ester solvents, ketone solvents and aromatic hydrocarbon solvents. manufacturing method.

ADVANTAGE OF THE INVENTION According to this invention, the laminated sheet which has light-polarizing property excellent in workability which does not have whitening caused by an organic solvent, and the crack by shaping|molding process does not generate|occur|produce can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the structure of each layer of the lamination sheet of this embodiment.
It is a photograph which shows the cross section of the laminated sheet of this embodiment.
Fig. 3 is a schematic diagram showing a method for applying an organic solvent for swelling polycarbonate and laminating an adhesive film by a kiss roll method.

EMBODIMENT OF THE INVENTION Hereinafter, the form (henceforth "this embodiment") for implementing this invention is demonstrated in detail. In addition, this invention is not limited to the following embodiment, It can variously deform and implement within the range of the summary.

<Lamination sheet>

The laminated sheet of the present embodiment includes a first polycarbonate layer, a first adhesive layer, a polarizing film layer, a second adhesive layer, and a second polycarbonate layer,

The first adhesive layer is laminated on the first surface of the polarizing film layer, the second adhesive layer is laminated on the second surface,

In the first adhesive layer, a first polycarbonate layer is laminated on a surface opposite to the surface on which the polarizing film layer is laminated, and in the second adhesive layer, a surface opposite to the surface on which the polarizing film layer is laminated. It is a laminated sheet in which a second polycarbonate layer is laminated,

and a swelling layer is present between the first polycarbonate layer and the first adhesive layer and/or between the second adhesive layer and the second polycarbonate layer.

The laminated sheet of this embodiment is a laminated sheet which has the laminated constitution shown in FIG. 1, for example.

The lamination sheet of this embodiment is organic by forming a swelling layer between the said 1st polycarbonate layer and the said 1st adhesive bond layer, and/or between the said 2nd adhesive bond layer and the said 2nd polycarbonate layer. There is no whitening caused by the solvent, and cracks do not occur when the sheet is subjected to molding by bending, thereby exhibiting the effect of excellent workability.

The laminated sheet of this embodiment is useful as a material, such as sunglasses, goggles, and a corrective lens, for example.

(polarizing film layer)

The polarizing film layer in this embodiment is a layer which has light polarization property which polarizes light in a specific direction, or allows only the polarized light to pass, and contains light polarizing polymer resin. Specific examples of the light-polarizing polymer resin include polyvinyl alcohol, olefin-vinyl alcohol copolymer, polyene, and polyvinyl halide, and these may be used in combination of one or more. Among the light-polarizing polymer resins, polyvinyl alcohol and olefin-vinyl alcohol copolymers are preferred from the viewpoint of transparency and orientation.

In addition, the said polarizing film layer can also be obtained from a polarizing film. As the polarizing film, a dichroic dye such as polyiodine or a dichroic organic dye is adsorbed and oriented to the above polymer resin film, and specifically, polyvinyl alcohol/polyiodine type, olefin-vinyl alcohol copolymer/polyiodine type Polarizing films, such as a polyvinyl alcohol/2 chromatic organic dye type|system|group, and an olefin-vinyl alcohol copolymer/2 chromatic organic dye type|system|group, are mentioned. As these polarizing films, a commercial item can also be used. As a specific example of a commercial item, the Paula Techno company make, "Grey-15", etc. are mentioned, for example.

Although it does not restrict|limit especially since the thickness of a polarizing film layer varies with a use, It is preferable that it is 10-100 micrometers, It is more preferable that it is 10-60 micrometers, It is still more preferable that it is 20-40 micrometers.

(Adhesive layer)

The adhesive bond layer in this embodiment is a layer formed by bonding a polycarbonate film and a polarizing film with an adhesive agent. The adhesive is not particularly limited as long as it adheres the polycarbonate film and the polarizing film.

As an adhesive agent which comprises an adhesive bond layer, For example, polyvinyl acetate type adhesive agent; polyacrylic acid ester adhesives containing homopolymers such as methyl acrylate, ethyl acrylate, butyl acrylate and 2-ethylhexyl acrylate, and copolymers such as methyl methacrylate, acrylonitrile and styrene; cyanoacrylate-based adhesives; an ethylene copolymer-based adhesive comprising a copolymer of ethylene and a monomer such as vinyl acetate, ethyl acrylate, acrylic acid, and methacrylic acid; cellulosic adhesive; polyester adhesive; polyamide-based adhesives; polyimide-based adhesives; an amino resin adhesive containing a urea resin or a melamine resin; phenolic resin adhesive; epoxy adhesive; Polyurethane adhesive which may contain a polycarbonate block; reactive (meth)acrylic adhesive; rubber adhesives including chloroprene rubber, nitrile rubber, styrene-butadiene rubber, and the like; silicone adhesive; Inorganic adhesives containing alkali metal silicates, low-melting-point glass, etc.; etc. can be used.

The adhesive may be in any form, such as an aqueous type, a solution type, an emulsion type, and a dispersion type. In addition, any form, such as a film form, a powder form, and a solid form, may be sufficient as the property of the said adhesive agent. Further, the bonding mechanism is not particularly limited, and examples thereof include a thermosetting type, a photocuring type, a solvent volatilization type, and a moisture curing type.

The adhesive bond layer in this embodiment may contain the organic solvent in the range which does not corrode to a polycarbonate layer and produce whitening. From the viewpoint of preventing whitening, the organic solvent in the adhesive layer is preferably 5% by mass or less, more preferably 3% by mass or less, and 1% by mass or less, based on the total amount of the adhesive layer. It is more preferable, and it is especially preferable not to contain it at all.

(Polycarbonate layer)

The polycarbonate layer in the present embodiment is a layer containing polycarbonate, for example, a layer formed of a polycarbonate film. The polycarbonate film is not particularly limited as long as an organic solvent permeates and a swelling layer is formed, for example, the Pure Ace series manufactured by Teijin Kasei Corporation (as the above Pure Ace series, for example, KL-3000, KJ- 3000, etc.), Kaneka Corporation Elmek series, Nippon GE Plastics Corporation Illuminex series, etc. Commercially available polycarbonate films, such as a series, can be used.

The thickness of the polycarbonate layer in this embodiment is not particularly limited because it varies depending on the use, but it is preferably 10-300 µm, more preferably 30-200 µm, and 50-150 µm. more preferably.

The laminated sheet of this embodiment contains at least two polycarbonate layers. Each polycarbonate film forming the polycarbonate layer of the laminated sheet may have the same thickness, series, type, or the like of such films, or may be different. In addition, each polycarbonate layer in the laminated sheet of this embodiment may be formed from the polycarbonate film in which two or more polycarbonate films were laminated|stacked.

(swelling layer)

The swelling layer in this embodiment exists between the said 1st polycarbonate layer and the said 1st adhesive bond layer, and/or between the said 2nd adhesive bond layer and the said 2nd polycarbonate layer. For example, a swelling layer is present as shown in FIG. 2 . As a method of forming the swelling layer, for example, the adhesive layer is formed on the surfaces of the first polycarbonate layer and the second polycarbonate layer to be adhered to the first adhesive layer and the second adhesive layer. A method in which the organic solvent is permeated into the polycarbonate layer and swells the polycarbonate layer is suitable by applying a varnish in which an organic solvent is mixed with the adhesive to be used, or by directly applying an organic solvent. The swelling layer is a layer including the polycarbonate resin that is present on the surface of the polycarbonate layer is dissolved in an organic solvent and the polycarbonate resin is altered.

In general, when a polycarbonate and an organic solvent are brought into contact, the organic solvent erodes the polycarbonate layer and the polycarbonate layer whitens, which causes a decrease in transparency of the laminated sheet and deterioration of the appearance. However, forming the swelling layer by subjecting the polycarbonate layer to constant erosion with an organic solvent does not cause whitening, and when molding processing such as bending is performed again, the interface between the adhesive sheet layer and the polycarbonate layer It was discovered unexpectedly to prevent the crack which generate|occur|produces inside the polycarbonate in.

It is preferable that the thickness of the said swelling layer is 1-30 micrometers, It is preferable that it is 3-15 micrometers, It is preferable that it is 5-10 micrometers. When the thickness of the swelling layer is less than 1 µm, cracks tend to occur easily inside the polycarbonate at the interface between the adhesive sheet layer and the polycarbonate, and when it exceeds 30 µm, when the laminate sheet is manufactured Polycarbonate and the organic solvent in the corrosive excessively tend to cause whitening.

The present embodiment provides a laminated sheet in which the first polycarbonate layer, the swelling layer, the first adhesive layer, the polarizing film layer, the second adhesive layer, the swelling layer, and the second polycarbonate layer are laminated in this order (hereinafter referred to as “ It is preferable that it is also called "laminated sheet 1").

The lamination sheet of this embodiment should just contain the lamination sheet 1 as a basic structure. A laminate sheet in which one or more resin films are laminated on the laminate sheet 1 with or without an adhesive layer is also included in the present embodiment. It does not restrict|limit especially as said resin film, A polycarbonate film; Cellulose ester resin film; polyester-based resin films such as polyethylene terephthalate and polyethylene naphthalate; polyethylene-based resin film; polypropylene resin film; norbornene-based resin film; A fluororesin film etc. are mentioned.

As a preferred embodiment, for example, a laminated sheet in which a polycarbonate layer is again laminated through an adhesive on the outside of the laminated sheet 1, that is, a third polycarbonate layer, a third adhesive layer, and a first polycarbonate layer. A laminated sheet in which the polarizing film layer, the swelling layer, the first adhesive layer, the polarizing film layer, the second adhesive layer, the swelling layer, the second polycarbonate layer, the fourth adhesive layer, and the fourth polycarbonate layer are laminated in this order (Hereinafter, also called "laminated sheet 2") is mentioned.

In the lamination sheet 2, the first adhesive layer is laminated on the first surface of the polarizing film layer, and the second adhesive layer is laminated on the second surface,

In the first adhesive layer, a first polycarbonate layer is laminated on a surface opposite to the surface on which the polarizing film layer is laminated, and in the second adhesive layer, a surface opposite to the surface on which the polarizing film layer is laminated. A second polycarbonate layer is laminated on the

In the first polycarbonate layer, the third adhesive layer is laminated on the surface opposite to the surface on which the first adhesive layer is laminated, and the second polycarbonate layer is the surface on which the second adhesive layer is laminated. A fourth adhesive layer is laminated on the surface opposite to the

In the third adhesive layer, a third polycarbonate layer is laminated on a surface opposite to the surface on which the first polycarbonate layer is laminated, and in the fourth adhesive layer, the second polycarbonate layer is laminated. It is a laminated sheet in which the 4th polycarbonate layer was laminated|stacked on the surface opposite to the surface on which the layers were laminated|stacked.

In addition, in the laminated sheet 2, there is a swelling layer between the first polycarbonate layer and the first adhesive layer and/or between the second adhesive layer and the second polycarbonate layer,

It is a laminated sheet in which the swelling layer may exist between the said 3rd polycarbonate layer and the said 3rd adhesive bond layer, and/or between the said 4th adhesive bond layer and the said 4th polycarbonate layer.

<Method for producing laminated sheet>

In the manufacturing method of the laminated sheet of this embodiment, the swelling layer is formed between the said 1st polycarbonate layer and the said 1st adhesive bond layer, and/or between the said 2nd adhesive bond layer and the said 2nd polycarbonate layer. It will not restrict|limit especially if it is a manufacturing method which can be used, For example, the following (Manufacturing method 1) and (Manufacturing method 2) are mentioned suitably.

(Manufacturing method 1)

(1) a step of coating the surface of the polycarbonate film with a varnish containing an organic solvent for swelling the polycarbonate and an adhesive;

(2) after the step (1), drying the varnish coated on the surface of the polycarbonate film to form an adhesive layer;

(3) The process of bonding a polarizing film and the said adhesive bond layer after the process of said (2);

A method for producing a laminated sheet comprising a.

The varnish contains an organic solvent that swells the polycarbonate and an adhesive. The solid content concentration in the varnish is preferably 20.0 to 70.0 mass%, more preferably 30.0 to 60.0 mass%, and 40.0 to 50.0 from the viewpoint of sufficiently forming a swelling layer and preventing whitening of the polycarbonate. It is more preferable that it is mass %. Here, solid content in a varnish refers to the component contained in varnishes other than the organic solvent which swells polycarbonate.

The varnish can be prepared by mixing an organic solvent that swells the polycarbonate and the adhesive. Specifically, when the adhesive is, for example, a thermosetting adhesive, the thermosetting adhesive generally has a thermally polymerizable prepolymer as a basic component, a thermally polymerizable monomer is added as necessary, and generates cations or radicals by heating. A polymerization initiator etc. are contained. A varnish comprising a thermosetting adhesive is prepared by mixing and stirring a thermosetting prepolymer, a thermosetting catalyst, an organic solvent and, if necessary, a thermopolymerizable monomer.

The thermally polymerizable prepolymer is not particularly limited as long as it can be used for an adhesive, and may be a radical polymerization type or a cationic polymerization type. Examples of the thermally polymerizable prepolymer include a carboxylic acid group-containing copolymer prepolymer of polycarbonate and polyurethane (hereinafter, also referred to as “COOH group-containing polycarbonate-based polyurethane”), epoxy resin Prepolymers, acrylic resin prepolymers, silicone resin prepolymers, vinyl acetate resin prepolymers, polystyrene resin prepolymers, polyvinyl alcohol resin prepolymers, cellulose resin prepolymers, etc. are mentioned, and these may be used alone and may be used in combination of two or more types. Among the thermally polymerizable prepolymers, a COOH group-containing polycarbonate-based polyurethane is preferable from the viewpoints of adhesiveness, heat resistance, and transparency.

As the thermally polymerizable monomer, for example, trimethylolpropane triglycidyl ether, bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, bisphenol fluorenediglycidyl ether, glycidyl methacrylate copolymer, etc. of glycidyl group-containing compounds; alicyclic epoxy compounds such as 3,4-epoxycyclohexane and bis(3,4-epoxycyclohexylmethyl)adipate; vinyl compounds such as styrene, vinyl acetate, vinyl chloride, vinylidene chloride, acrylonitrile, vinyl ether, acrolein, and divinylbenzene; ?-olefin compounds such as ethylene and butadiene; Methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethyl mono (meth) acrylate compounds such as hexyl (meth) acrylate, decyl (meth) acrylate, lauryl (meth) acrylate, and stearyl (meth) acrylate; Ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate compounds such as di(meth)acrylate and dipropylene glycol di(meth)acrylate; etc. are mentioned, These may be used individually by 1 type, and may be used in combination of 2 or more type. Among the thermally polymerizable prepolymers, an alicyclic epoxy compound is preferred from the viewpoint of adhesiveness, heat resistance, and transparency.

Moreover, it is preferable that it is 100 g/eq or more, and, as for the epoxy equivalent of the said glycidyl group containing compound or alicyclic epoxy compound, it is more preferable that it is 150 g/eq or more.

As a thermal polymerization initiator, what generate|occur|produces a radical, a thing which generate|occur|produces a cation, etc. are mentioned, for example by heating. Specific examples of the polymerization initiator include tertiary amines such as benzyldimethylamine, 2,4,6-tris(dimethylaminomethyl)phenol, cyclohexyldimethylamine, and triethanolamine; 2-methylimidazole, 2-n-heptylimidazole, 2-n-undecylimidazole, 2-phenylimidazole, 2-phenyl-4-methylimidazole, 1-benzyl-2- imidazole compounds such as methylimidazole, 1-benzyl-2-phenylimidazole, 1,2-dimethylimidazole, and 2-ethyl-4-methylimidazole; organophosphorus compounds such as diphenylphosphine, triphenylphosphine, and triphenyl phosphite; quaternary phosphonium salts such as benzyltriphenylphosphonium chloride, tetra-n-butylphosphonium bromide, methyltriphenylphosphonium bromide, ethyltriphenylphosphonium bromide, and n-butyltriphenylphosphonium bromide; diazabicycloalkenes such as 1,8-diazabicyclo[5.4.0]undecene-7 and organic acid salts thereof; organometallic compounds such as zinc octylate, tin octylate, and aluminum acetylacetone complex; quaternary ammonium salts such as tetraethylammonium bromide, tetra-n-butylammonium bromide, tetraethylammonium chloride and tetra-n-butylammonium chloride; boron compounds such as boron trifluoride and triphenyl borate; metal halide compounds such as zinc chloride and stannic chloride; These etc. are mentioned, 1 type may be used for these, and may be used in combination of 2 or more type. Among the said polymerization initiators, an imidazole compound is preferable from a viewpoint of sclerosis|hardenability, adhesiveness, and heat resistance, and 2-methylimidazole is more preferable.

In addition, the varnish includes various fillers such as silica, alumina, and hydrated alumina, antioxidants, ultraviolet absorbers, light stabilizers, antistatic agents, leveling agents, defoamers, and coloring pigments, which are usually added to adhesives. there may be

The step of applying the varnish can be carried out, for example, by a roll coating method, a gravure roll coating method, a kiss roll coating method, a die coating method, a comma coating method, a direct coating method by a direct gravure coater, etc. The die-coating method is preferable from a viewpoint of film thickness uniformity.

Drying conditions are not particularly limited as long as it is a condition that a swelling layer can be formed in the polycarbonate layer and whitening of the polycarbonate layer does not occur, but it is preferably 3 to 5 minutes at 70 to 130° C., 100 It is more preferable that it is 3-5 minutes at to 130 degreeC.

Although it does not restrict|limit especially since the thickness of the adhesive bond layer after the process of drying a varnish differs according to a use, It is preferable that it is 5-30 micrometers, and it is more preferable that it is 10-20 micrometers.

(Manufacturing method 2)

(1) a step of coating the surface of the polycarbonate film with an organic solvent causing the polycarbonate to swell;

(2) after the step (1), a step of laminating an adhesive film on the surface of the polycarbonate film coated with the organic solvent to form an adhesive layer;

(3) The process of bonding a polarizing film and the said adhesive bond layer after the process of said (2);

A method of manufacturing a laminated sheet comprising a.

(1) The step of coating the surface of the polycarbonate film with an organic solvent for swelling the polycarbonate and lamination of the adhesive film can be performed simultaneously, for example, a roll coating method, a gravure roll coating method, a kiss It can be carried out by a roll method or the like, and among these, the kiss roll method is preferable from the viewpoint that the organic solvent can be applied to the entire substrate in a uniform amount, and consequently the thickness control of the swelling layer becomes easy. Fig. 3 schematically shows a method for applying an organic solvent for swelling polycarbonate and laminating an adhesive film by the kiss roll method.

In the step (1) of the step of applying an organic solvent for swelling the polycarbonate to the surface of the polycarbonate film, a swelling layer can be formed on the polycarbonate layer as the adhesion amount of the organic solvent, In addition, although it will not restrict|limit especially if it is an amount in which whitening of a polycarbonate layer does not occur, It is preferable to make it adhere so that it may become 1-100 g/m<2>.

Moreover, it is preferable to dry the said organic solvent for the polycarbonate film to which the organic solvent was adhered. Drying conditions are not particularly limited as long as it is a condition that a swelling layer can be formed in the polycarbonate layer and whitening of the polycarbonate layer does not occur, but it is preferably 3 to 5 minutes at 70 to 130° C., 100 It is more preferable that it is 3-5 minutes at to 130 degreeC.

An adhesive bond layer can be formed by laminating an adhesive film after coating and drying of an organic solvent.

The adhesive film is a film adhesive, and as the adhesive film, for example, a commercially available product based on urethane acrylate or the like can be used. In addition, as an adhesive film, what was manufactured by the general manufacturing method of an adhesive film can also be used. As a general method for producing the adhesive film, for example, an organic solvent is appropriately added to the above-mentioned adhesive to prepare a varnish, a layer of the varnish is formed on the base film, and after drying by heating, the base film is removed, etc. can be heard As a base film, plastic films, such as a polytetrafluoroethylene film, a polyethylene terephthalate (PET) film, a polyethylene film, a polypropylene film, a polymethylpentene film, a polyimide film, are mentioned, for example.

The organic solvent for swelling the polycarbonate in (Production Method 1) and (Production Method 2) is preferably at least one selected from the group consisting of ester solvents, ketone solvents and aromatic hydrocarbon solvents.

Examples of the ester solvent include ethyl formate, propyl formate, n-pentyl formate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, n-pentyl acetate, γ-butyrolactone, and dimethyl carbonate. .

Examples of the ketone solvent include acetone, methyl ethyl ketone (MEK), diethyl ketone, dipropyl ketone, diisobutyl ketone, methyl isobutyl ketone (MIBK), cyclopentanone, cyclohexanone, and methylcyclohexanone. Non, methylcyclohexanone, etc. are mentioned.

As an aromatic hydrocarbon type solvent, toluene, xylene, cyclohexylbenzene etc. are mentioned, for example.

Among the organic solvents, from the viewpoint of forming an optimal swelling layer, ketone solvents are preferable, and methyl ethyl ketone is more preferable.

Although the process of (3) in (Manufacturing method 1) and (Manufacturing method 2) will not be restrict|limited in particular if it is a method of bonding a polarizing film and an adhesive bond layer, The method by lamination is suitable. After bonding the polarizing film and the adhesive layer, if necessary, the adhesive may be further cured by heating or the like.

The lamination sheet of the present embodiment includes a first polycarbonate layer, a swelling layer, a first adhesive layer, a polarizing film layer, a second adhesive layer, a swelling layer, and a second polycarbonate layer (above When a resin film is laminated on the lamination sheet 1) with or without an adhesive layer, lamination of such a resin film can be performed by a known method.

For example, the third polycarbonate layer, the third adhesive layer, the first polycarbonate layer, the swelling layer, the first adhesive layer, the polarizing film layer, the second adhesive layer, the swelling layer, the second polycarbonate layer A lamination sheet (the lamination sheet 2) comprising a layer, a fourth adhesive layer, and a fourth polycarbonate layer is laminated with the polarizing film of (3) in (Manufacturing method 1) and (Manufacturing method 2). By replacing the sheet 1, it can be obtained by the same manufacturing method as (Manufacturing method 1) and (Manufacturing method 2).

The laminated film of this embodiment can be used for sunglasses, goggles, or a corrective lens, etc., for example.

[Example]

Examples are shown below and the present invention will be described in more detail, but the present invention is not limited by the examples described below. In addition, the term in an Example and a comparative example, and the measuring method of a characteristic are as follows.

Polycarbonate film: Pure Ace KL-3000 (manufactured by Teijin)

Polarizing film: Gray-15 (manufactured by Polar Techno)

Thermosetting prepolymer (A): COOH group-containing polycarbonate-based polyurethane (Mw: 30,000 to 60,000, acid value 5 to 25 mgKOH/g)

Thermally polymerizable monomer (B): alicyclic epoxy (epoxy equivalent 175 g/eq, EHPE3150 (manufactured by Daicel))

Thermosetting catalyst (C): 2-methylimidazole (2MZ-H)

(bending workability)

After forming the laminated sheets produced in Examples 1 to 7 and Comparative Examples 1 to 6 to be described later with a press machine with a mold temperature of 135°C to a radius of curvature of 50 mm, the presence or absence of cracks by cross-sectional observation was observed. In Table 1 and Table 2, the thing without a crack was shown as "circle", and the thing where a crack was observed was shown as "x".

(polycarbonate efflorescence)

A varnish or an organic solvent was applied on a polycarbonate film having a thickness of 125 µm, and the appearance of the polycarbonate film after drying at 130°C for 5 minutes was visually observed. In Table 1 and Table 2, the thing in which generation|occurrence|production of whitening did not generate|occur|produce "(circle)" and the thing in which generation|occurrence|production of whitening was observed was shown as "x".

[Examples 1 to 6, Comparative Examples 1 to 6]

(1) Production of varnish

With respect to 100 parts by mass of the thermosetting prepolymer (A), 10 parts by mass of the thermopolymerizable monomer (B), 0.1 parts by mass of the thermosetting catalyst (C), and the organic solvent (D) shown in Tables 1 and 2, Table 1 and a varnish of the solid content concentration shown in Tables 1 and 2 (mass percent concentration (%) of the total mass of (A), (B) and (C) relative to the total amount of varnish)) made In addition, the number of mass parts of (A), (B), (C), and (D) is the number of mass parts converted into solid content.

(2) Formation of adhesive layer

The varnish obtained in (1) above was applied with a die coater on a polycarbonate film having a thickness of 125 μm so that the thickness after drying was 15 μm, and dried at 130° C. for 5 minutes to make the varnish semi-cured. A sample was obtained.

(3) Preparation of laminated sheet

With respect to the polarizing film, the varnish-coated surface of the sample obtained in the above (2) was laminated from both sides and cured at 70°C for 48 hours to obtain a sample of a laminated sheet.

[Example 7]

As shown in FIG. 3, the laminated sheet was produced by the kiss roll method.

Specifically, first, on a polycarbonate film having a thickness of 125 µm, methyl ethyl ketone (MEK) was applied with a kiss roll so that an adhesion amount of 10 g/m 2 was applied, and then dried at 130° C. for 5 minutes. Next, by laminating the adhesive film, the polycarbonate film with an adhesive bond layer was obtained. Moreover, the lamination sheet was obtained by operation similar to "(3) preparation of the lamination sheet" in Examples 1-6 mentioned above.

In addition, the adhesive film is the composition adhesive of Example 1, that is, with respect to 100 parts by mass of the thermosetting prepolymer (A), 10 parts by mass of the thermally polymerizable monomer (B) and 0.1 parts by mass of the thermosetting catalyst (C) To the adhesive having a composition , 50 mass parts of MEK was added as an organic solvent, the varnish was manufactured, the said varnish was apply|coated to the PET film to which the mold release process was given, and what dried at 130 degreeC for 5 minutes was used.

The laminated sheet of Example 7 had no cracks in the evaluation of bending workability. Moreover, in the evaluation of polycarbonate whitening, the lamination sheet of Example 7 did not generate|occur|produce whitening.

In the laminated sheets of Examples 1 to 7, it was confirmed that the laminated sheets were excellent in workability, in which there was no whitening caused by an organic solvent and cracks due to molding did not occur.

The laminated film of this invention can be used as sunglasses, goggles, or a corrective lens, etc., for example.

1: Laminated sheet
2: first polycarbonate layer
3: swelling layer
4: first adhesive layer
5: polarizing film layer
6: second adhesive layer
7: swelling layer
8: second polycarbonate layer
9: Glue
10 : Lamy Roll
11: polycarbonate film
12 : Kiss Roll
13: organic solvent

Claims (10)

a first polycarbonate layer, a first adhesive layer, a polarizing film layer, a second adhesive layer, and a second polycarbonate layer;
The first adhesive layer is laminated on the first surface of the polarizing film layer, and the second adhesive layer is laminated on the second surface,
In the first adhesive layer, a first polycarbonate layer is laminated on a surface opposite to the surface on which the polarizing film layer is laminated, and in the second adhesive layer, a surface opposite to the surface on which the polarizing film layer is laminated. It is a laminated sheet in which a second polycarbonate layer is laminated,
A swelling layer is present between the first polycarbonate layer and the first adhesive layer and/or between the second adhesive layer and the second polycarbonate layer,
The thickness of the swelling layer is 1 to 30㎛, the laminated sheet. The laminated sheet according to claim 1, wherein the polarizing film layer contains at least one selected from the group consisting of polyvinyl alcohol and olefin-vinyl alcohol copolymer. The laminated sheet according to claim 1 or 2, for use in sunglasses, goggles, or corrective lenses. (1) a step of coating the surface of the polycarbonate film with a varnish containing an organic solvent for swelling the polycarbonate and an adhesive;
(2) after the step (1), drying the varnish coated on the surface of the polycarbonate film to form an adhesive layer;
(3) The process of bonding a polarizing film and the said adhesive bond layer after the process of said (2);
The manufacturing method of the laminated sheet of Claim 1 containing. The manufacturing method of the laminated sheet of Claim 4 whose solid content concentration in the said varnish is 20.0-70.0 mass %. The method for producing a laminated sheet according to claim 4, wherein the drying conditions are 3 to 5 minutes at 70 to 130°C. The manufacturing method of the laminated sheet of Claim 4 whose thickness of the said adhesive bond layer after the process of drying the said varnish is 5-30 micrometers. (1) a step of coating the surface of the polycarbonate film with an organic solvent causing the polycarbonate to swell;
(2) a step of forming an adhesive layer by laminating an adhesive film on the surface of the polycarbonate film coated with the organic solvent after the step (1);
(3) The process of bonding a polarizing film and the said adhesive bond layer after the process of said (2);
The manufacturing method of the laminated sheet of Claim 1 containing. The laminated sheet according to any one of claims 4 to 8, wherein the organic solvent for swelling the polycarbonate is at least one selected from the group consisting of ester solvents, ketone solvents and aromatic hydrocarbon solvents. manufacturing method. delete

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