Abstract: A main object of the present invention is to provide a block copolymer composition which has good elasticity, while having excellent stress relaxation properties. The object is achieved by providing a block copolymer composition obtained by a modification treatment, the block copolymer composition comprising a block copolymer B formed by introducing a functional group capable of forming a non-covalent bond into a block copolymer A including at least one aromatic vinyl polymer block and at least one conjugated diene polymer block.

Abstract: A main object of the present invention is to provide a block copolymer composition which has good elasticity, while having excellent stress relaxation properties. The object is achieved by providing a block copolymer composition obtained by a modification treatment, the block copolymer composition comprising a block copolymer B formed by introducing a functional group capable of forming a non-covalent bond into a block copolymer A including at least one aromatic vinyl polymer block and at least one conjugated diene polymer block.

Abstract: Provided are a modified hydrocarbon resin that can provide a hot-melt adhesive composition with low odor, low Gardner color and high peel adhesion, a method for producing the resin, and the hot-melt adhesive composition. A modified hydrocarbon resin comprising a 1,3-pentadiene monomer unit, a C4-C6 alicyclic monoolefin monomer unit, a C4-C8 acyclic monoolefin monomer unit, an alicyclic diolefin monomer unit, and an aromatic monoolefin monomer unit, and containing a carboxyl group or acid anhydride group, wherein a weight average molecular weight (Mw), a Z average molecular weight (Mz), a ratio (Mz/Mw), a Gardner color scale of a 50 mass % toluene solution, a softening point, and an acid value are in specific ranges.

Abstract: Provided is a modified hydrocarbon resin that provides a hot melt adhesive composition with low odor, excellent heat stability, and high adhesive properties. The modified hydrocarbon resin is obtained by hydrogenating a hydrocarbon resin comprising a plurality of specific monomeric unit in a specific range, and characterized in that: a degree of hydrogenation of the olefins, a degree of hydrogenation of the aromatic rings, a weight average molecular weight (Mw), a Z-average molecular weight (Mz), a ratio (Mz/Mw) of the Z-average molecular weight to the weight-average molecular weight, a Gardner color scale of a toluene solution of 50 mass %, and a difference between pre-hydrogenation and post-hydrogenation mixed aniline point (MMAP) are within the specific range.

Abstract: Provided is a modified hydrocarbon resin that provides a hot melt adhesive composition with low odor, excellent heat stability, and high adhesive properties. The modified hydrocarbon resin is obtained by hydrogenating a hydrocarbon resin comprising a plurality of specific monomeric unit in a specific range, and characterized in that: a degree of hydrogenation of the olefins, a degree of hydrogenation of the aromatic rings, a weight average molecular weight (Mw), a Z-average molecular weight (Mz), a ratio (Mz/Mw) of the Z-average molecular weight to the weight-average molecular weight, a Gardner color scale of a toluene solution of 50 mass %, and a difference between pre-hydrogenation and post-hydrogenation mixed aniline point (MMAP) are within the specific range.

Abstract: Provided are a modified hydrocarbon resin that can provide a hot-melt adhesive composition with low odor, low Gardner color and high peel adhesion, a method for producing the resin, and the hot-melt adhesive composition. A modified hydrocarbon resin comprising a 1,3-pentadiene monomer unit, a C4-C6 alicyclic monoolefin monomer unit, a C4-C8 acyclic monoolefin monomer unit, an alicyclic diolefin monomer unit, and an aromatic monoolefin monomer unit, and containing a carboxyl group or acid anhydride group, wherein a weight average molecular weight (Mw), a Z average molecular weight (Mz), a ratio (Mz/Mw), a Gardner color scale of a 50 mass % toluene solution, a softening point, and an acid value are in specific ranges.