公开(公告)号：US20220259347A1

公开(公告)日：2022-08-18

申请号：US17625803

申请日：2020-06-05

Applicant: ZEON CORPORATION

Inventor： Hirofumi MASUDA ,  Takafumi KAWANAKA

IPC: C08F220/18 ,  C08K3/04

Abstract: An acrylic rubber excellent in water resistance and a method for producing the same are provided. An acrylic rubber composed of: 70 to 99.9 wt % of a bonding unit derived from (meth) acrylic acid ester; 0.1 to 10 wt % of a bonding unit derived from a cross-linkable monomer; and if necessary, 0 to 20 wt % of a bonding unit derived from another monomer, wherein the ash content is 0.5 wt % or less, the total amount of magnesium and phosphorus in the ash is 30 wt % or more, a ratio of the magnesium to the phosphorus ([Mg]/[P]) by weight is 0.4 to 2.5, and Mooney viscosity (ML1+4, 100° C.) of the rubber is 10 to 150 is particularly excellent in water resistance, and a rubber cross-linked product using the same is also excellent in physical properties.

公开(公告)号：US20220259345A1

公开(公告)日：2022-08-18

申请号：US17626067

申请日：2020-07-17

Applicant: ZEON CORPORATION

Inventor： Hirofumi MASUDA ,  Takafumi KAWANAKA

IPC: C08F220/10 ,  C08K3/02 ,  C08K3/04

Abstract: 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 cross-linked product of the rubber mixture are provided. The acrylic rubber bale 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 60% by weight or less, and a specific gravity is 0.8 or more.

公开(公告)号：US20200239612A1

公开(公告)日：2020-07-30

申请号：US16482831

申请日：2018-01-31

Applicant: ZEON CORPORATION

Inventor： Keisuke KOJIMA ,  Kazuhiro EJIRI ,  Hirofumi MASUDA

IPC: C08F220/18

Abstract: An acrylic rubber has a residual calcium content of 60 wt ppm or less and a polymer pH of 7.0 or less, and preferably has a carboxyl group.

公开(公告)号：US20220389141A1

公开(公告)日：2022-12-08

申请号：US17626613

申请日：2020-06-05

Applicant: ZEON CORPORATION

Inventor： Hirofumi MASUDA ,  Nobuhiro TSUNEKUNI

IPC: C08F220/18 ,  C08F220/28 ,  C08F218/08 ,  C08F2/26 ,  C08F2/30 ,  C08F6/22 ,  B29C48/00

Abstract: An acrylic rubber including: a polymer composition of: 70 to 99.9% by weight of a bonding unit derived from at least one (meth) acrylic acid ester selected from (meth) acrylic acid alkyl ester and (meth) acrylic acid alkoxyalkyl ester; 0.1 to 10% by weight of a bonding unit derived from a monomer containing a reactive group; and 0 to 20% by weight of a bonding unit derived from other monomer, wherein ash content is 0.15% by weight or less, total amount of sodium and sulfur in the ash is 60% by weight or more, a ratio of sodium to sulfur by weight ratio is in the range of 0.5 to 2.5, ratio of Z-average molecular weight to weight average molecular weight is 1.3 or more, and weight average molecular weight is in the range of 1,000,000 to 5,000,000.

公开(公告)号：US20220235190A1

公开(公告)日：2022-07-28

申请号：US17626439

申请日：2020-06-05

Applicant: ZEON CORPORATION

Inventor： Hirofumi MASUDA ,  Takafumi KAWANAKA

IPC: C08J5/18 ,  C08L33/08 ,  C08F6/22 ,  C08F6/16 ,  C08F2/24 ,  C08K5/13 ,  B29C48/00

Abstract: An acrylic rubber sheet excellent in storage stability and processability, a method for producing the same, an acrylic rubber bale obtained by laminating the sheets, a mixture obtained by mixing the acrylic rubber sheet and the acrylic rubber bale, a method for producing the mixture and a rubber cross-linking product obtained by cross-linking the mixture. The acrylic rubber sheet comprises, an acrylic rubber mainly composed of a (meth) acrylic acid ester and having a weight average molecular weight (Mw) of 100,000 to 5,000,000 and a ratio (Mz/Mw) of a Z-average molecular weight (Mz) and a weight average molecular weight (Mw) is 1.3 or more, and the acrylic rubber sheet contains a phenolic anti-aging agent, and a gel amount is 50 wt % or less. The acrylic rubber sheet is extremely excellent in storage stability and processability and the sheet can be easily produced by the claimed method.

公开(公告)号：US20200002523A1

公开(公告)日：2020-01-02

申请号：US16480137

申请日：2018-01-26

Applicant: ZEON CORPORATION

Inventor： Ayako FURUKO ,  Kazuhiro EJIRI ,  Hirofumi MASUDA

IPC: C08L33/08 ,  C08F220/18 ,  C08F220/32 ,  C08F212/36 ,  C08L33/06 ,  C08L33/10 ,  C08K3/04 ,  C08K5/00 ,  C08K5/19

Abstract: An acrylic rubber includes a (meth)acrylate ester monomeric unit; and a crosslinkable monomeric unit, wherein a complex viscosity at 60° C. denoted as η*(60° C.) and a complex viscosity at 100° C. denoted as η*(100° C.) satisfy the following formula (1) and the following formula (2). η*(100° C.)/η*(60° C.)

公开(公告)号：US20220315683A1

公开(公告)日：2022-10-06

申请号：US17626633

申请日：2020-06-05

Applicant: ZEON CORPORATION

Inventor： Hirofumi MASUDA ,  Takafumi KAWANAKA

IPC: C08F220/18 ,  C08F220/28 ,  C08F220/44 ,  C08F216/14 ,  C08F2/26 ,  C08F6/22 ,  B29C48/00 ,  C08K3/04 ,  C08K5/18

Abstract: 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 cross-linked product of the rubber mixture are provided. The acrylic rubber bale 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 a specific gravity is 0.8 or more.

公开(公告)号：US20220259348A1

公开(公告)日：2022-08-18

申请号：US17626780

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 strength properties and processability, a method for producing the same, a rubber mixture containing the acrylic rubber bale, a method for producing the same, and a rubber cross-linked product of the same. The acrylic rubber bale includes an acrylic rubber mainly containing a (meth) acrylic acid ester having a weight average molecular weight (Mw) of 1,000,000 to 5,000,000, and a ratio (Mz/Mw) of a Z-average molecular weight (Mz) and a weight average molecular weight (Mw) is 1.3 or more, wherein an amount of gel insoluble in methyl ethyl ketone is 50% by weight or less.

公开(公告)号：US20220251277A1

公开(公告)日：2022-08-11

申请号：US17626161

申请日：2020-06-05

Applicant: ZEON CORPORATION

Inventor： Hirofumi MASUDA ,  Nobuhiro TSUNEKUNI

IPC: C08F283/06 ,  C08K11/00

Abstract: An acrylic rubber sheet excellent in storage stability and water resistance, a method for producing the same, a rubber mixture containing the acrylic rubber sheet and a rubber cross-linked product thereof are provided. The acrylic rubber sheet according to the present invention includes an acrylic rubber having a reactive group and having a weight average molecular weight (Mw), a ratio of a Z-average molecular weight (Mz) and a weight average molecular weight (Mw) in a specific range. The acrylic rubber sheet according to the present invention has an ash content of 0.2% by weight or less, an amount of gel insoluble in methyl ethyl ketone is 50% by weight or less, and a water content of less than 1% by weight, and is excellent in water resistance and highly well-balanced in strength properties and processability.

公开(公告)号：US20230159682A1

公开(公告)日：2023-05-25

申请号：US17626020

申请日：2020-06-05

Applicant: ZEON CORPORATION

Inventor： Hirofumi MASUDA ,  Takafumi KAWANAKA

IPC: C08F220/18 ,  C08F220/28 ,  C08F222/16 ,  C08F2/26 ,  C08F6/00 ,  C08F6/22 ,  C08F6/16 ,  C08K5/134 ,  B29C48/00

CPC classification number: C08F220/1802 ,  C08F220/1804 ,  C08F220/281 ,  C08F222/16 ,  C08F2/26 ,  C08F6/008 ,  C08F6/22 ,  C08F6/16 ,  C08K5/134 ,  B29C48/022 ,  B29K2033/08

Abstract: An acrylic rubber, including: 50 to 99.9% by weight of a bond unit derived from at least one (meth) acrylic acid ester selected from the group consisting of (meth) acrylic acid alkyl ester and (meth) acrylic acid alkoxyalkyl ester; 0.1 to 20% by weight of a bond unit derived from a monomer containing a reactive group; and 0 to 30% by weight of a bond unit derived from other monomer, wherein the acrylic rubber contains a phenolic anti-aging agent represented by a general formula (1),




(R1 represents an isopropyl group or a t-butyl group, and R2 represents an alkyl group having 1 to 12 carbon atoms), and the weight average molecular weight (Mw) of the acrylic rubber is in the range of 100,000 to 5,000,000.