公开(公告)号：US12018109B2

公开(公告)日：2024-06-25

申请号：US17421061

申请日：2019-11-26

Applicant: SHOWA DENKO K.K.

Inventor： Naoki Sekioka ,  Masanao Kamijo ,  Noriko Ogawa

IPC: C08F279/02 ,  C08C19/25 ,  C08F2/26 ,  C08F2/30 ,  C08F230/08 ,  C08L11/02 ,  C09J151/04

CPC classification number: C08F279/02 ,  C08C19/25 ,  C08F2/26 ,  C08F2/30 ,  C08F230/085 ,  C08L11/02 ,  C09J151/04 ,  C09J2301/304 ,  C09J2400/143

Abstract: A method for producing a chloroprene graft copolymer latex includes a step of adding an ethylenic double bond-containing silane coupling agent (B) to a chloroprene polymer latex and graft copolymerizing the ethylenic double bond-containing silane coupling agent (B) to the chloroprene polymer (A) in the chloroprene polymer latex at 10° C. to 50° C. (inclusive). The amount of the ethylenic double bond-containing silane coupling agent (B) added is 0.4 parts by mass to 9.0 parts by mass (inclusive) per 100 parts by mass of the chloroprene polymer (A). The present invention also relates to an adhesive containing the chloroprene graft copolymer latex and to a method for using the adhesive. The present invention can provide a method for producing a chloroprene graft copolymer latex containing no organic solvent and having high adhesive strength to glass, an adhesive containing the same, and a method for using the adhesive.

公开(公告)号：US11028212B2

公开(公告)日：2021-06-08

申请号：US16324204

申请日：2017-08-01

Applicant: SHOWA DENKO K.K.

Inventor： Naoki Sekioka ,  Yuya Ohguma ,  Masanao Kamijo ,  Yoichiro Takenoshita

IPC: C08F279/02 ,  C08L51/04 ,  C09J151/04 ,  C09J111/02

Abstract: Provided is a method for producing a chloroprene graft copolymer latex containing no organic solvent and exhibiting high adhesive strength even for soft polyvinyl chloride. A method for producing a chloroprene graft copolymer latex includes a chloroprene polymerization step of giving a chloroprene polymer latex and a graft copolymerization step of giving a chloroprene graft copolymer latex. The chloroprene polymerization step is a step of subjecting at least chloroprene (A-1) of chloroprene (A-1) and a monomer (A-2) copolymerizable with chloroprene (A-1) to emulsion radical polymerization. The graft copolymerization step is a step of adding, to the chloroprene polymer latex, a (meth)acrylate (B) and an organic peroxide (C) having an octanol/water partition coefficient of −2.0 or more and 3.0 or less to subject the chloroprene polymer to graft copolymerization with the (meth)acrylate (B) at a temperature of 10° C. or more and 40° C. or less.

公开(公告)号：US12139563B2

公开(公告)日：2024-11-12

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 ,  B29C41/00 ,  C08K3/22 ,  C08K5/00 ,  C08L11/02 ,  C08L93/04 ,  B29L31/48

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：US11427701B2

公开(公告)日：2022-08-30

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 ,  A61B42/10 ,  A41D19/00 ,  C08K3/22 ,  C08K5/00 ,  C08K5/13 ,  C08K5/31 ,  C08K5/405

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.