Denka Company Limited

Yushi Kumagai

Naoki Kobayashi

Yutaka Saito

Masahiro Kato

Wataru Nishino

Misaki Ito

Hideharu Mori

Ibuki Shimotomai

A chloroprene-based block copolymer, a latex, a latex composition, and a rubber composition that can produce a product with excellent tensile properties and flexibility without the use of a vulcanizing agent or a vulcanizing accelerator having a chloroprene-based block copolymer, contains 5 to 30% by mass of a polymer block (A) and 70 to 95% by mass of a chloroprene-based polymer block (B), wherein the polymer block (A) is derived from a monomer, when the monomer is polymerized alone, a polymer with a glass transition temperature of 80° C. or higher can be obtained and the chloroprene-based polymer block (B) includes a chloroprene monomer unit and a polyfunctional monomer unit.

Chloroprene-based block copolymer, latex, latex composition, and rubber composition

A chloroprene-based block copolymer, a latex, a latex composition, and a rubber composition that can produce a product with excellent flexibility and tensile properties without the use of a vulcanizing agent or a vulcanizing accelerator. A chloroprene-based block copolymer, includes 5 to 30% by mass of a polymer block (A) and 70 to 95% by mass of a chloroprene-based polymer block (B), wherein: the polymer block (A) is derived from a monomer; when the monomer is polymerized alone, a polymer with a glass transition temperature of 80° C. or higher can be obtained; the chloroprene-based polymer block (B) includes a chloroprene monomer; and the chloroprene-based block copolymer has a toluene insoluble content of 20 to 100% by mass with respect to 100% by mass of the chloroprene-based block copolymer.

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Tokyo, Japan

Yushi Kumagai