公开(公告)号：US20240034862A1

公开(公告)日：2024-02-01

申请号：US18256692

申请日：2021-10-01

Applicant: Denka Company Limited

Inventor： Masahiro KATO ,  Misaki ITO ,  Yushi KUMAGAI ,  Yutaka SAITO

IPC: C08L9/00 ,  C08J5/02

CPC classification number: C08L9/00 ,  C08J5/02

Abstract: A method for producing a chloroprene polymer composition containing a chloroprene polymer, the method including: a polymerization step of polymerizing a monomer containing chloroprene at a polymerization rate of 20% or more to obtain a polymer composition containing a chloroprene polymer; and a mixing step of mixing the polymer composition with a rosin containing at least one conjugate resin acid component selected from the group consisting of abietic acid, neoabietic acid, palustric acid, levopimaric acid, and salts thereof, in which a mixed amount of the rosin in the mixing step is more than 0 parts by mass and 23 parts by mass or less with respect to 100 parts by mass of solid content of the polymer composition.

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.

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：US20230074040A1

公开(公告)日：2023-03-09

申请号：US17788994

申请日：2021-03-22

Applicant: DENKA COMPANY LIMITED

Inventor： Hideharu MORI ,  Wataru NISHINO ,  Yushi KUMAGAI ,  Yutaka SAITO ,  Naoki KOBAYASHI

IPC: C08F293/00 ,  C08K5/06

Abstract: 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.

公开(公告)号：US20230055361A1

公开(公告)日：2023-02-23

申请号：US17788958

申请日：2021-03-22

Applicant: DENKA COMPANY LIMITED

Inventor： Yushi KUMAGAI ,  Wataru NISHINO ,  Yutaka SAITO ,  Naoki KOBAYASHI

IPC: C08F293/00 ,  C08K5/01

Abstract: 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.

公开(公告)号：US20230050436A1

公开(公告)日：2023-02-16

申请号：US17788950

申请日：2021-03-22

Applicant: DENKA COMPANY LIMITED

Inventor： Yushi KUMAGAI ,  Wataru NISHINO ,  Yutaka SAITO ,  Naoki KOBAYASHI

IPC: C08F293/00

Abstract: A chloroprene-based block copolymer latex, including a chloroprene-based block copolymer, wherein: the 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); 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 unit; and when the chloroprene-based block copolymer latex is molded by immersion molding to obtain a film and then the film is heat-treated at 130° C. for 30 minutes, a tensile strength at break measured in accordance with JIS K6251 of the film is 17 MPa or more is provided.

公开(公告)号：US20230025987A1

公开(公告)日：2023-01-26

申请号：US17788782

申请日：2021-03-22

Applicant: DENKA COMPANY LIMITED

Inventor： Yushi KUMAGAI ,  Wataru NISHINO ,  Yutaka SAITO ,  Naoki KOBAYASHI

IPC: C08F293/00 ,  C08J3/05

Abstract: An immersion-molded body, wherein: the immersion-molded body is obtained using a latex; the latex comprises a chloroprene-based block copolymer; the 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); 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 unit; and when the immersion-molded body is heat-treated at 130° C. for 30 minutes, a tensile strength at break of the heat-treated immersion-molded body measured in accordance with JIS K6251 is 17 MPa or more.