Fujikura Kasei Co., Ltd.

Hirokazu Mogami

Masayoshi Inada

Miki Taketani

An adhesive composition of one aspect of the present invention contains a block copolymer composed of a polymer block A which includes a (meth)acrylate ester unit having a linear or branched side chain of 1 to 8 carbon atoms and has a number average molecular weight of 2,000 to 10,000, a polymer block B which includes at least one of an aromatic vinyl compound unit and a (meth)acrylate ester unit having a cyclic structure, and a polymer block C which includes a (meth)acrylate ester unit having a linear or branched side chain of 1 to 8 carbon atoms, wherein the mass ratio (B/C) between the polymer block B and the polymer block C is within a range from 5.0/95.0 to 30.0/70.0, the mass ratio (A/(B+C)) between the polymer block A and the total of the polymer block B and the polymer block C is within a range from 0.1/99.9 to 5.0/95.0, and the acid value of the block copolymer is at least 8 mgKOH/g.

Adhesive composition

An adhesive composition, includes a block copolymer (X) formed of a block (A) and a block (B), the block (A) having a glass transition temperature of 75&#xb0; C. or higher, the block (A) including a monomer unit having a first cyclic structure and a carboxyl group-containing monomer unit, the block (B) including 70% or more of an acrylic acid ester unit represented by General Formula (1); and a tackifier (Y) having a softening point of 120&#xb0; C. or higher and a second cyclic structure, in which a mass ratio of the block (A) to the block (B) (block (A)/block (B)) is 10/90 to 40/60, in an acid value of the block copolymer (X), an acid value derived from the block (A) is 8 mgKOH/g or more, and at least one end of the block copolymer (X) is the block (A).

An adhesive composition, includes: a block copolymer (X) that includes a block (A) and a block (B), the block (A) having a glass transition point of 75&#xb0; C. or higher, the block (A) including a monomer unit having a cyclic structure and a carboxyl group-containing monomer unit, the block (B) containing an acrylic acid ester unit represented by the following general Formula (1) in an amount of 70 mass % or more, the block copolymer (X) having an acid value of 8 mgKOH/g or more, in which a mass ratio of the block (A) to the block (B) (block (A)/block (B)) is 10/90 to 30/70, the block (A) is located on at least one end of the block copolymer (X), and the block (B) is sandwiched between blocks (A) at said one end of the block copolymer (X).CH&#x2550;CR&#x2014;COOR&#x2003;&#x2003;(1)

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Kuki, Japan

Hirokazu Mogami