公开(公告)号：US20210309846A1

公开(公告)日：2021-10-07

申请号：US17267195

申请日：2019-08-08

Applicant: OSAKA SODA CO., LTD.

Inventor： Ryo OKADA ,  Shinichi UDO ,  Motoki KITAGAWA ,  Masatsugu NAITOU

IPC: C08L33/08 ,  C08F220/18 ,  C08F222/40

Abstract: It is an object of the present invention to provide an acrylic copolymer for providing a highly heat-resistant rubber material that shows a small rate of change in strength without loss of elongation, even under a high-temperature condition over a long period, and a composition containing the acrylic copolymer. The present invention provides an acrylic copolymer comprising a structural unit (A) derived from a monomer containing a structure having a maleimide skeleton, a structural unit (B) derived from an acrylic acid alkyl ester and/or a structural unit (B) derived from an acrylic acid alkoxyalkyl ester, and a structural unit (C) derived from an unsaturated monomer having a crosslinking group; a composition comprising the acrylic copolymer and a crosslinking group; and a rubber material produced from the composition.

公开(公告)号：US20230174696A1

公开(公告)日：2023-06-08

申请号：US17912769

申请日：2021-03-30

Applicant: OSAKA SODA CO., LTD.

Inventor： Ryo OKADA ,  Yoshihiro MOROOKA ,  Shota MIKI ,  Motoki KITAGAWA

IPC: C08F220/18 ,  C08F220/28 ,  C08F222/16 ,  C08F2/26 ,  C08F6/22

CPC classification number: C08F220/1802 ,  C08F220/1804 ,  C08F220/281 ,  C08F222/16 ,  C08F2/26 ,  C08F6/22

Abstract: The present invention aims to provide an acrylic copolymer capable of maintaining excellent storage stability in the uncrosslinked state even after long-term exposure to high temperatures, and a crosslinked acrylic rubber product produced from the acrylic copolymer which maintains good normal-state properties and good water resistance. The present invention is based on the finding that an acrylic copolymer produced by polymerizing a liquid mixture of an alkoxyalkyl (meth)acrylate containing an alkoxyalkyl group and a crosslinkable monomer containing a carboxy group has excellent storage stability and that a crosslinked product produced from the acrylic copolymer has good normal-state properties and good water resistance.