Method for producing laminate for configuring image display device, and image display device using the laminate
View Patent ↗A method for producing a laminate for configuring an image display device is provided, capable of realizing simultaneously unevenness followability and anti-bubble reliability. A method for producing a laminate for configuring an image display device is proposed, comprising the following steps (1) and (2): (1) The step of forming an adhesive composition into the form of a monolayer or a multilayer sheet, and by UV-crosslinking, primary-curing this thereby forming a pre-secondary curing transparent double-sided adhesive sheet. (2) The step of layering two image display device-constituting members via the pre-secondary curing transparent double-sided adhesive sheet and then irradiating ultraviolet light from at least a first image display device-constituting member side, UV-crosslinking through this member and secondary-curing the pre-secondary curing transparent double-sided adhesive sheet.
1. A method for producing a laminate, the method comprising:
forming an adhesive composition into a form of a monolayer or a multilayer sheet;
primary-curing the monolayer or multilayer sheet by UV-crosslinking to obtain a pre-secondary curing transparent double-sided pressure-sensitive adhesive sheet;
layering two image display device-constituting members via the pre-secondary curing transparent double-sided adhesive sheet; and then
irradiating ultraviolet light from a side of an image display device-constituting member, thereby UV-crosslinking and secondary-curing the pre-secondary curing transparent double-sided adhesive sheet through the member,
wherein the adhesive composition comprises at least one selected from the group consisting of (a) a meth)acrylic monomer for polymerization or copolymerization of two different kinds of monomers, and (b) an acrylic acid ester polymer or acrylic acid ester copolymer, and
wherein the adhesive composition further comprises at least one selected from the group consisting of an oligomer and a plasticizer.
2. The method according to claim 1 ,
wherein forming the adhesive composition into the monolayer or a multilayer sheet comprises forming the sheet on a transparent release sheet, and
primary-curing the sheet comprises UV-crosslinking through the transparent release sheet.
3. The method according to claim 2 , wherein the image display device constituting members are each laminates comprising a touch panel, an image display panel, a surface protection panel, a polarization film, or any combination thereof.
4. The method according to claim 1 , wherein, the image display device-constituting members are each laminates comprising a touch panel, an image display panel, a surface protection panel, a polarization film, or any combination thereof.
5. The method according to claim 1 , wherein the adhesive composition comprises an acrylic acid ester copolymer that comprises two species of vinyl monomers having a difference in glass transition temperature of from 25 to 300° C., or wherein the acrylic acid ester polymer or acrylic acid ester copolymer comprises a (meth)acrylic monomer as a copolymerized component.
6. The method according to claim 1 , wherein the adhesive composition comprises an intermolecular hydrogen-abstracting photo-polymerizing initiator.
7. The method according to claim 1 , wherein the adhesive composition further comprises:
multi-functional (meth)acrylates comprising two or more (meth)acryloyl groups, and
a hydrogen-abstraction type photo-polymerization initiator.
8. The method according to claim 1 , wherein the adhesive composition is curable by a radical or radicals.
9. The method according to claim 1 , comprising;
forming the adhesive composition into a form of a monolayer, and;
primary-curing the monolayer sheet by UV-crosslinking to obtain a pre-secondary curing transparent double-sided pressure-sensitive adhesive sheet.