Adhesive layer, laminate, optical laminate, method for producing optical laminate, and optical device
AssigneeNitto Denko Corporation
InventorsMizuho Mizuno, Akiko Tanaka, Naofumi Kosaka, Kozo Nakamura
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Abstract
An adhesive layer (20a) has a creep deformation rate when a stress of 10000 Pa is applied at 50° C. for 1 second is 10% or less, and a creep deformation rate when a stress of 10000 Pa is applied at 50° C. for 30 minutes is 16% or less, in a creep test using a rotational rheometer, and has a 180° peel adhesive strength of 10 mN/20 mm or more with respect to a PMMA film.
Claims26
An adhesive layer having a creep deformation rate of 10% or less when a stress of 10000 Pa is applied at 50° C. for 1 second, and a creep deformation rate of 16% or less when a stress of 10000 Pa is applied at 50° C. for 30 minutes, in a creep test using a rotational rheometer, and having a 180° peel adhesive strength of 10 mN/20 mm or more with respect to a polymethyl methacrylate (PMMA) film;
- wherein
- the adhesive layer comprises a (meth)acrylic polymer, and at least one of polymers (1) to (3):
- (1) a copolymer of a nitrogen-containing (meth)acrylic monomer and at least one other monomer,
- (2) a copolymer of a carboxyl group-containing acrylic monomer and at least one other monomer except for nitrogen-containing (meth)acrylic monomers, and
- (3) a polyester-based polymer,
- the (meth)acrylic polymer is a copolymer of an alkyl (meth)acrylate having an alkyl group with 4 to 9 carbon atoms and at least one other monomer, and
- a ratio of the alkyl (meth)acrylate to a total amount of monomer used in production of the (meth)acrylic polymer of the adhesive layer is 50 mass % or more.
Dependencies are inferred from the claim text.