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AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsToshinori Shiraki, Fusakazu Hayano, Hideo Morita
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A modified block copolymer composition comprising a thermoplastic polymer and a modified block copolymer consisting essentially of a base block copolymer of a monovinyl substituted aromatic hydrocarbon polymer block and an olefin compound polymer block having an ethylenic unsaturation degree not exceeding 20%, the base block copolymer having a molecular unit containing a carboxylic acid group and/or a group derived therefrom grafted thereto. The modified block copolymer composition of the present invention is a resinous composition excellent in impact resistance, adhesion, paint adhesion, weatherability, resistance to thermal deterioration, transparency and gloss or a rubbery or leather-like composition excellent in heat resistance, adrasion resistance, compression set resistance, adhesion, transparency, oil resistance, weatherability and resistance to heat aging.
A modified block copolymer comprising a linear base block copolymer of at least two monovinyl substituted aromatic hydrocarbon polymer blocks and at least one olefin compound polymer block having an ethylenic unsaturation degree not exceeding 20%, said linear base block copolymer having at least one maleic anhydride unit non-radically grafted thereonto, said linear base block copolymer having a monovinyl substituted aromatic hydrocarbon content of 5 to 95% by weight.
A process for producing a modified block copolymer, which comprises reacting a linear base block copolymer of at least two monovinyl substituted aromatic hydrocarbon polymer blocks and at least one olefin compound polymer block having an ethylenic unsaturation degree not exceeding 20%, said linear base block copolymer having a monovinyl substituted aromatic hydrocarbon content of 5 to 95% by weight, with maleic anhydride in the absence of a radical initiator so that at least one maleic anhydride unit is non-radically grafted onto said linear base block copolymer.
Dependencies are inferred from the claim text.