Zeon Corporation

Ayako Furuko

Sadaharu Hashimoto

Ryouji Oda

A main object of the present disclosure is to provide a block copolymer composition that allows an adhesive composition having excellent die-cutting properties, softening agent anti-migration performance, mandrel properties and transparency to be obtained. The object is achieved by providing a block copolymer composition comprising: a block copolymer A represented by the following formula (I); and a block copolymer B represented by the following formula (II); characterized in that: a content of an aromatic vinyl monomer unit of the block copolymer A is more than a content of an aromatic vinyl monomer unit of the block copolymer B; a weight average molecular weight of aromatic vinyl polymer block Ar3 (Mw(Ar3)) of the block copolymer B is substantially the same as a weight average molecular weight of aromatic vinyl polymer block Ar1 (Mw(Ar1)) of the block copolymer A; and breaking strength of the block copolymer composition is 8 MPa or less and breaking elongation of the block copolymer composition is 2000% or less.

Block copolymer composition and adhesive composition

The present invention is a block copolymer composition comprising an aromatic vinyl-isoprene-aromatic vinyl triblock copolymer (A) and an aromatic vinyl-isoprene diblock copolymer (B),

Block copolymer composition, adhesive composition, and adhesive sheet

Disclosed is a block copolymer composition for a hot melt adhesive, comprising a block copolymer A and a block copolymer B each having a particular structure, characterized in that the aromatic vinyl monomer unit content of the block copolymer A is 30% to 50% by weight; the aromatic vinyl monomer unit content of the block copolymer B is 15% to 25% by weight; a content of the aromatic vinyl monomer units relative to all polymer components of the block copolymer composition is 18% to 45% by weight; the weight ratio (A/B) of the block copolymer A with respect to the block copolymer B is 20/80 to 80/20; and the ratio (MwA/MwB) of the weight average molecular weight of the block copolymer A (MwA) with respect to the weight average molecular weight of the block copolymer B (MwB) is 0.65 to 1.5.

Block copolymer composition for hot melt adhesive

Provided is a hot-melt adhesive composition which can be easily applied at a relatively low temperature, has a long open time, and also has high holding power. A hot-melt adhesive composition comprising a block copolymer composition which includes a block copolymer A and a block copolymer B, and a tackifying resin, wherein a weight ratio (A/B) of the block copolymer A and the block copolymer B is 25/75 to 90/10, and an aromatic vinyl monomer unit content of the block copolymer A is 41% or greater.

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Tokyo, Japan

Ayako Furuko