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：US12297378B2

公开(公告)日：2025-05-13

申请号：US17618114

申请日：2020-05-15

Applicant: SHOWA DENKO K.K.

Inventor： Naoki Sekioka ,  Akira Shibuya ,  Noriko Ogawa ,  Ryo Makio

IPC: C09J111/02 ,  C09J7/24 ,  C09J7/38 ,  C09J11/04 ,  C09J11/08

Abstract: There is provided an adhesive agent exhibiting high adhesive strength to polyolefin. An adhesive agent contains a chloroprene copolymer latex containing a chloroprene copolymer (A) and a metal oxide (B). The chloroprene copolymer (A) is a copolymer of a monomer group containing chloroprene (A-1), α,β-unsaturated carboxylic acid (A-2), and 2,3-dichloro-1,3-butadiene (A-3). The chloroprene copolymer (A) has a tetrahydrofuran-soluble component soluble in tetrahydrofuran and the weight average molecular weight of the tetrahydrofuran-soluble component is 80000 or more and 140000 or less. When the amount of the metal oxide (B) based on 100 parts by mass of the chloroprene copolymer (A) is defined as Y part(s) by mass and the weight average molecular weight of the tetrahydrofuran-soluble component is defined as X, the content of the metal oxide (B) satisfies Formula: −1.2×X/100000+1.6