公开(公告)号：US20220267491A1

公开(公告)日：2022-08-25

申请号：US17626383

申请日：2020-06-05

Applicant: ZEON CORPORATION

Inventor： Hirofumi MASUDA ,  Takafumi KAWANAKA

IPC: C08F220/18 ,  C08F6/00 ,  C08F6/22 ,  C08L13/00 ,  C08L33/08 ,  B29B11/12 ,  B29C43/36 ,  B29C48/00 ,  B29C48/07 ,  B29C48/505 ,  B29C48/88 ,  B29C48/92

Abstract: An acrylic rubber bale excellent in storage stability and processability, a method for producing the same, a rubber mixture obtained by mixing the acrylic rubber bale, and a rubber cross-linked product of the rubber mixture are provided. The acrylic rubber bale according to the present invention includes an acrylic rubber having a reactive group and a weight average molecular weight (Mw) of 100,000 to 5,000,000, wherein an amount of gel insoluble in methyl ethyl ketone is 50% by weight or less, and pH is 6 or less.

公开(公告)号：US20220251330A1

公开(公告)日：2022-08-11

申请号：US17625817

申请日：2020-06-05

Applicant: ZEON CORPORATION

Inventor： Hirofumi MASUDA ,  Nobuhiro TSUNEKUNI

IPC: C08K3/08 ,  C08F20/18 ,  C08K3/06

Abstract: An acrylic rubber bale excellent in storage stability and water resistance and a method for producing the same are provided. An acrylic rubber bale, including an acrylic rubber having a reactive group, with a specific ash content, a large proportion of magnesium and phosphorus in the ash, and a specific ratio of magnesium and phosphorus, is highly excellent in storage stability and water resistance. This acrylic rubber bale can be produced by using a specific stabilizer and a specific coagulant in an emulsion polymerization process of an acrylic rubber and performing a process from coagulation process to baling process under specific conditions.

公开(公告)号：US20220251265A1

公开(公告)日：2022-08-11

申请号：US17626402

申请日：2020-06-05

Applicant: ZEON CORPORATION

Inventor： Hirofumi MASUDA ,  Takafumi KAWANAKA

IPC: C08F220/12 ,  C08K11/00

Abstract: Acrylic rubber bale having remarkably improved storage stability and water resistance without deteriorating cross-linking properties, a method of production, a rubber mixture obtained by mixing the acrylic rubber bale, a method of production, and a rubber cross-linked product obtained by cross-linking the same is provided. The acrylic rubber bale includes an acrylic rubber, and the acrylic rubber is mainly composed of (meth) acrylic acid ester, and has a weight average molecular weight of 100,000 to 5,000,000, and has a ratio of a Z-average molecular weight and a weight average molecular weight of 1.3 or more, where an ash content is 0.6% by weight or less, and the ash contains a periodic table group 2 metal and phosphorus, and a phosphorus content is 10% by weight or more, and the ratio of the periodic table group 2 metal to phosphorus is in the range of 0.6 to 2 molar ratio.