Asahi Kasei Kabushiki Kaisha

Asahi Kasei Kogyo Kabushiki Kaisha

Asahi Kasei Chemicals Corporation

Junko Kakegawa

Susumu Hoshi

Yukio Yamaura

Hideki Nakamura

Shigeki Takayama

Tomofumi Maekawa

Tsutomu Sugimoto

A flame retardant polytrimethylene terephthalate resin composition, comprising:

Flame-retardant polytrimethylene terephthalate resin composition

Disclosed is a block copolymer composition comprising a block copolymer (I) comprising at least two polymer blocks (each polymer block (S) comprising vinyl aromatic hydrocarbon monomer units) and at least one polymer block (B) comprising isoprene monomer units and 1,3-butadiene monomer units, and a polystyrene resin (II), wherein, in the block copolymer (I), the amount of the vinyl aromatic hydrocarbon monomer units, the total amount of the isoprene monomer units and the 1,3-butadiene monomer units, and the isoprene monomer unit/1,3-butadiene monomer unit weight ratio are within specific range, wherein the block copolymer (I) has a vinyl aromatic hydrocarbon block ratio (BL) within a specific range, and wherein the block copolymer (I) and the polystyrene resin (II) satisfy a relationship represented by the following formula (1):15+0.25&#x2266;35+0.25&#x2003;&#x2003;(1)wherein BL represents the block ratio of the copolymer (I), and Wa represents the weight percentage, based on the total weight of the copolymer (I) and the resin (II), of the copolymer (I).

Block copolymer composition

Disclosed is a block copolymer comprising at least two S polymer blocks comprising vinyl aromatic hydrocarbon monomer units, and one B polymer block or two or more B polymer blocks which contains or collectively contain isoprene monomer units and 1,3-butadiene monomer units, wherein the amount of the vinyl aromatic hydrocarbon monomer units and the total amount of the isoprene monomer units and the 1,3-butadiene monomer units are, respectively, from 60 to 95% by weight and from 40 to 5% by weight, each based on the weight of the copolymer, wherein the isoprene monomer unit/1,3-butadiene monomer unit weight ratio is from 45/55 to 97/3, and wherein the vinyl aromatic hydrocarbon monomer unit moiety of the copolymer has a short segment ratio of from 0 to 30% by weight, which is defined as the weight percentage, based on the total weight of vinyl aromatic hydrocarbon monomer units in the copolymer, of the vinyl aromatic hydrocarbon monomer units in at least one short segment consisting of 1 to 3 vinyl aromatic hydrocarbon monomer units.

Block copolymer and composition thereof

Hydrolytically stable, halogen-free flame retardant resin composition

Growing community of inventors

Kawasaki, Japan

Junko Kakegawa