公开(公告)号：US20220073657A1

公开(公告)日：2022-03-10

申请号：US17421149

申请日：2019-11-26

Applicant: SHOWA DENKO K.K.

Inventor： Masahiro OGAWA ,  Tomoaki MURATA ,  Noriko OGAWA ,  Masanao KAMIJO

IPC: C08F136/08 ,  C08L11/02 ,  C08L93/04 ,  C08K3/22 ,  C08K5/00 ,  B29C41/00

Abstract: An isoprene-based polymer latex composition includes a chloroprene polymer latex (A) and an isoprene polymer latex (B), in which the chloroprene polymer has a z-average particle size of 180 nm or greater and smaller than 300 nm, and a tetrahydrofuran-insoluble fraction of 80 to 99% by mass; the chloroprene polymer latex (A) is (1) a copolymer latex of chloroprene (A-1) and 2,3-dichloro-1,3-butadiene (A-2-1), or (2) a copolymer latex of the above (A-1) and (A-2-1), and another monomer (A-2-2); and the copolymer is obtained by copolymerization in which the ratio of 2,3-dichloro-1,3-butadiene (A-2-1) is 5.0 to 30.0% by mass relative to the total amount of the monomer components chloroprene (A-1) and 2,3-dichloro-1,3-butadiene (A-2-1) of 100% by mass. The isoprene-based polymer latex composition's quality is maintained, and the properties after cross-linking of a molded product obtained by dipping a dipping former into the composition multiple times do not deteriorate.

公开(公告)号：US20220162427A1

公开(公告)日：2022-05-26

申请号：US17418556

申请日：2019-11-25

Applicant: SHOWA DENKO K.K

Inventor： Tomoaki MURATA ,  Masahiro OGAWA ,  Noriko OGAWA ,  Masanao KAMIJO

IPC: C08L15/02 ,  C08C19/20 ,  A41D19/00

Abstract: A sulfur-modified chloroprene polymer latex includes an emulsifier and a sulfur-modified chloroprene polymer obtained by modifying a chloroprene polymer (A) with sulfur (B), wherein the sulfur amount Y in the sulfur-modified chloroprene polymer and the z-average particle size X of the sulfur-modified chloroprene polymer satisfy formulae (1) to (3) (formula (1): 0.10

公开(公告)号：US20220033626A1

公开(公告)日：2022-02-03

申请号：US17276537

申请日：2018-09-26

Applicant: SHOWA DENKO K.K.

Inventor： Tomoaki MURATA ,  Noriko OGAWA ,  Masanao KAMIJO

IPC: C08L11/02 ,  A41D19/00 ,  A61B42/10 ,  C08K3/22 ,  C08K5/405 ,  C08K5/31 ,  C08K5/13 ,  C08K5/00

Abstract: There is provided a chloroprene copolymer latex composition capable of obtaining a molded product having excellent mechanical properties and flexibility even when vulcanized and molded under milder conditions than before. A chloroprene copolymer latex composition contains a chloroprene copolymer latex (A), a metal oxide (B), a vulcanization accelerator (C), and an antioxidant (D). The chloroprene copolymer latex (A) is a latex containing particles of a chloroprene copolymer which is a copolymer of chloroprene (A-1), 2,3-dichloro-1,3-butadiene (A-2), and sulfur (A-3). The content of the sulfur (A-3) in the chloroprene copolymer is 0.1 part by mass or more and 1.0 part by mass or less when the total amount of the chloroprene (A-1) and the 2,3-dichloro-1,3-butadiene (A-2) is set to 100 parts by mass.