Adhesive sheet and bonding method using the same
AssigneeDai Nippon Printing Co., Ltd.
InventorsKentaro Hoshi, Junichi Kuroki, Takayuki Ueki, Takahisa Taniguchi
Life of this patent
Estimating the term…
Abstract
There is provided an adhesive sheet that has initial adhesiveness, can realize bonding between metals, between a metal and an organic material, and between organic materials, and can retain an excellent adhesion strength without undergoing a temperature change. The adhesive sheet comprises a first release paper, an adhesive layer, and a second release paper stacked in that order, the adhesive layer containing an adhesive, the adhesive containing at least an acrylic resin, an epoxy resin, and a curing agent, the content of the epoxy resin being 175 to 300 parts by weight per 100 parts by weight of the acrylic resin.
Claims10
An adhesive sheet comprising:
- a first release paper, an adhesive layer, and a second release paper stacked in that order,
- the adhesive layer containing an adhesive,
- the adhesive containing at least an acrylic resin, an epoxy resin, and a curing agent,
- the content of the epoxy resin being 175 to 300 parts by weight per 100 parts by weight of the acrylic resin, wherein the epoxy resin is a mixture of a nitrile butadiene rubber-modified epoxy resin with a bisphenol A epoxy resin, and wherein the acrylic resin is an acrylic ester copolymer selected from the group consisting of ethyl acrylate-butyl acrylate-acrylonitrile copolymers, ethyl acrylate-acrylonitrile copolymers and butyl acrylate-acrylonitrile copolymers,
- wherein when a laminated body is prepared by laminating two carbon fiber reinfored plastic sheets of 100 mm in length ×25 mm in width ×1.5 mm in thickness via the adhesive layer of 12.5 mm in length ×25 mm in width and curing the adhesive layer at 180° C. for one hour while applying a load of 3 kg onto the laminated body, the adhesion strength thereof is more than 12 MPa
- wherein the adhesive has a three-dimensional islands-sea structure comprising sea formed of the acrylic resin and islands formed of the epoxy resin.
A laminated body comprising:
- a first adherend bonded to a second adherend through an adhesive layer comprising at least an acrylic resin, an epoxy resin and a curing agent, the content of the epoxy resin being 175 to 300 parts by weight per 100 parts by weight of the acrylic resin
- wherein the epoxy resin is a mixture of a nitrile butadiene rubber-modified epoxy resin with a bisphenol A epoxy resin, and wherein the acrylic resin is an acrylic ester copolymer selected from the group consisting of ethyl acrylate-butyl acrylate-acrylonitrile copolymers, ethyl acrylate-acrylonitrile copolymers and butyl acrylate-acrylonitrile copolymers,
- wherein when a laminated body is prepared by laminating two carbon fiber reinforced plastic sheets of 100 mm in length ×25 mm in width ×1.5 mm in thickness via the adhesive layer of 12.5 mm in length ×25 mm in width and curing the adhesive layer at 180° C. for one hour while applying a load of 3 kg onto the laminated body, the adhesion strength thereof is more than 12 MPa,
- wherein the adhesive has a three-dimensional islands-sea structure comprising sea formed of the acrylic resin and islands formed of the epoxy resin,
- wherein the laminated body is produced by
- preparing the adhesive layer,
- bonding the first adherend to the second adherend through the adhesive layer, and
- curing the adhesive layer.
Dependencies are inferred from the claim text.