公开(公告)号：US20240132649A1

公开(公告)日：2024-04-25

申请号：US18276400

申请日：2022-03-16

Applicant: DENKA COMPANY LIMITED

Inventor： Wataru NISHINO ,  Yushi KUMAGAI ,  Ibuki SHIMOTOMAI ,  Yutaka SAITO

IPC: C08F293/00 ,  A41D19/00 ,  C08F212/08 ,  C08F220/14 ,  C08F220/18 ,  C08F220/44 ,  C08F222/10

CPC classification number: C08F293/00 ,  A41D19/0055 ,  C08F212/08 ,  C08F220/14 ,  C08F220/1804 ,  C08F220/44 ,  C08F222/102

Abstract: A (meth)acrylate-based block copolymer including a polymer block and a (meth)acrylate-based polymer block, wherein: the (meth)acrylate-based block copolymer contains 5 to 30% by mass of the polymeric block and 70 to 95% by mass of the (meth)acrylate-based polymer block with respect to 100% by mass of the (meth)acrylate-based block copolymer; the polymer block has a monomer unit 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 a tensile strength at break measured in accordance with JIS K 6251 of a film obtained by immersion-molding a (meth)acrylate-based block copolymer latex containing the (meth)acrylate-based block copolymer and heat-treating at 130° C. for 30 minutes is 14 MPa or more.

公开(公告)号：US20240352175A1

公开(公告)日：2024-10-24

申请号：US18686594

申请日：2022-09-21

Applicant: DENKA COMPANY LIMITED

Inventor： Wataru NISHINO ,  Ibuki SHIMOTOMAI ,  Yutaka SAITO ,  Yushi KUMAGAI

IPC: C08F293/00 ,  C08K5/05

CPC classification number: C08F293/005 ,  C08K5/05 ,  C08F2438/03 ,  C08K2201/019

Abstract: Provided are a chloroprene-based block copolymer, a latex, a latex composition, and a rubber composition with which it is possible to obtain a molded body having excellent tensile strength at break and tensile elongation at break even with use of less or no vulcanizing agent or vulcanization accelerator.
A chloroprene-based block copolymer including 30 to 60% by mass of a polymer block (A) derived from a monomer that can yield a polymer with a glass transition temperature of 80° C. or higher when homopolymerized and 40 to 70% by mass of a chloroprene-based polymer block (B) having a chloroprene monomer unit and a polyfunctional monomer unit.