Abstract: 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.

Abstract: An acrylic rubber includes a (meth)acrylate ester monomeric unit; and a crosslinkable monomeric unit, wherein a complex viscosity at 60° C. denoted as ?*(60° C.) and a complex viscosity at 100° C. denoted as ?*(100° C.) satisfy the following formula (1) and the following formula (2). ?*(100° C.)/?*(60° C.)<0.8??(1) ?*(100° C.

Abstract: 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), (i) a ratio (MwDa/MwDb) of a weight average molecular weight MwDa of a polyisoprene block in the triblock copolymer (A) to a weight average molecular weight MwDb of a polyisoprene block in the diblock copolymer (B) being 0.5 or more to less than 1, (ii) a ratio of an aromatic vinyl monomer unit in all polymer components of the block copolymer composition being 10 to 30 mass %, and (iii) the block copolymer composition having a breaking strength of less than 8 MPa and an elongation at break of less than 1,100%; a pressure-sensitive adhesive composition comprising the block copolymer composition and a tackifying resin; and a pressure-sensitive adhesive sheet comprising a pressure-sensitive adhesive layer that comprises the pressure-sensitive adhesive composition.

Abstract: 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.

Abstract: 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), (i) a ratio (MwDa/MwDb) of a weight average molecular weight MwDa of a polyisoprene block in the triblock copolymer (A) to a weight average molecular weight MwDb of a polyisoprene block in the diblock copolymer (B) being 0.5 or more to less than 1, (ii) a ratio of an aromatic vinyl monomer unit in all polymer components of the block copolymer composition being 10 to 30 mass %, and (iii) the block copolymer composition having a breaking strength of less than 8 MPa and an elongation at break of less than 1,100%; a pressure-sensitive adhesive composition comprising the block copolymer composition and a tackifying resin; and a pressure-sensitive adhesive sheet comprising a pressure-sensitive adhesive layer that comprises the pressure-sensitive adhesive composition.

Abstract: 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.

Abstract: Provided is a block copolymer composition for a hot melt adhesive, which can provide a hot melt adhesive composition having excellent softening agent retainability, heat resistance and transparency. 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.

Abstract: 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.

Abstract: 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.