公开(公告)号：US20220227976A1

公开(公告)日：2022-07-21

申请号：US17615214

申请日：2020-10-23

Applicant: SHOWA DENKO K.K.

Inventor： Shu KANEKO ,  Masahiro OGAWA ,  Akira SHIBUYA

IPC: C08L11/02 ,  C08J5/02 ,  A61B42/10 ,  A41D19/04 ,  A41D19/00 ,  B29C41/14 ,  B29C41/00

Abstract: One embodiment of the present invention relates to a chloroprene copolymer latex, a method for producing a chloroprene copolymer latex, a chloroprene copolymer latex composition, and a molded article or dipped product of a chloroprene copolymer rubber. The chloroprene copolymer latex is a latex of a chloroprene copolymer including monomer units derived from 2-chloro-1,3-butadiene (chloroprene) and monomer units derived from 2-methyl-1,3-butadiene, wherein the tetrahydrofuran insoluble content in the chloroprene copolymer is 20% by mass or less, and the proportion of the monomer units derived from 2-methyl-1,3-butadiene is 10 to 27 mol % in the chloroprene copolymer.

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：US20220242987A1

公开(公告)日：2022-08-04

申请号：US17615286

申请日：2020-12-24

Applicant: SHOWA DENKO K.K.

Inventor： Shu KANEKO ,  Masahiro OGAWA ,  Akira SHIBUYA

IPC: C08F236/18 ,  B29C41/14 ,  B29C41/36 ,  A61B42/10 ,  A41D19/04 ,  C08K5/47 ,  C08K5/39 ,  C08K3/22 ,  C08K3/06 ,  C08K5/00

Abstract: The present invention relates to a chloroprene copolymer latex composition, a molded article of chloroprene copolymer rubber, or a dip-molded product, and the chloroprene copolymer latex composition includes a chloroprene copolymer (A) and a vulcanization accelerator (B). The chloroprene copolymer (A) includes monomer units derived from chloroprene and from 2-methyl-1,3-butadiene. The chloroprene copolymer latex composition includes a carbamate-based vulcanization accelerator and a thiazole-based vulcanization accelerator as the vulcanization accelerator (B). The chloroprene copolymer latex composition enables production of a molded article having high flexibility and high tensile strength without use of a vulcanization accelerator that is feared to have skin sensitization.

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