Acrylic rubber, acrylic rubber composition, crosslinked acrylic rubber, seal material, and hose material

Patent metadata

Field	Value
Publication number	US-12162969-B2
Application number	US-201916975903-A
Country	US
Kind code	B2
Filing date	Mar 18, 2019
Priority date	Mar 26, 2018
Publication date	Dec 10, 2024
Grant date	Dec 10, 2024

Abstract

An acrylic rubber containing acrylate monomer units, methacrylate monomer units, and crosslinkable monomer units, wherein a glass transition temperature is −20° C. or less, a change ratio in volume after a crosslinked rubber of the acrylic rubber is immersed in IRM903 oil at 150±2° C. for 72 hours is 0 to 100%, and a change ratio in weight after a crosslinked rubber of the acrylic rubber is immersed in hot water at 150±2° C. for 96 hours and dried is −5.0 to 0%.

First claim

The invention claimed is:

1. An acrylic rubber comprising:
acrylate monomer units;
methacrylate monomer units; and
crosslinkable monomer units;
wherein a glass transition temperature is −20° C. or less, a change ratio in volume after a crosslinked rubber of the acrylic rubber is immersed in IRM903 oil at 150±2° C. for 72 hours is 0 to 100%, and a change ratio in weight after the crosslinked rubber of the acrylic rubber is immersed in hot water at 150±2° C. for 96 hours and dried is-5.0 to 0%,
wherein a content of the acrylate monomer units is 80% by weight or less, based on a total amount of 100% by weight of total monomer units constituting the acrylic rubber,
wherein a content of the methacrylate monomer units is 17.9% by weight or more, based on a total amount of 100% by weight of total monomer units constituting the acrylic rubber, and
wherein none of the crosslinkable monomer units include epoxy groups.

2. The acrylic rubber according to claim 1 , wherein an acrylate constituting the acrylate monomer units is at least one selected from methyl acrylate, ethyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, n-octyl acrylate, and 2-methoxyethyl acrylate.

3. The acrylic rubber according to claim 1 , wherein a methacrylate constituting the methacrylate monomer units is at least one selected from alkyl methacrylate, alkoxyalkyl methacrylate, polyalkylene glycol methacrylate, and alkoxy polyalkylene glycol methacrylate.

4. The acrylic rubber according to claim 1 , wherein a methacrylate constituting the methacrylate monomer units is at least one selected from methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, n-butyl methacrylate, 2-methoxyethyl methacrylate, 2-ethoxyethyl methacrylate, 1-methyl-2-methoxyethyl methacrylate, diethylene glycol methacrylate, ethylene glycol methacrylate, triethylene glycol methacrylate, methoxydiethylene glycol methacrylate, and methoxytriethylene glycol methacrylate.

5. The acrylic rubber according to claim 1 , wherein a crosslinkable monomer constituting the crosslinkable monomer units is a monomer having a carboxyl group.

6. An acrylic rubber composition comprising the acrylic rubber of claim 1 .

7. A crosslinked acrylic rubber, wherein the acrylic rubber composition of claim 6 is crosslinked.

8. A seal material comprising the crosslinked acrylic rubber of claim 7 .

9. A hose comprising the crosslinked acrylic rubber of claim 7 .

10. The acrylic rubber according to claim 1 , wherein the glass transition temperature is −25° C. or less.

11. The acrylic rubber according to claim 1 , wherein the change ratio in volume is 30% or more and 80% or less.

12. The acrylic rubber according to claim 1 , wherein the change ratio in weight is −4.5 or more and −1.0% or less.

Assignees

• Zeon Corp

Inventors

• Bando Fumiaki
• Sato Susumu

Classifications

• C08F220/286

  and containing polyethylene oxide in the alcohol moiety, e.g. methoxy polyethylene glycol (meth)acrylate · CPC title

• C08F220/288

  and containing polypropylene-co-ethylene oxide in the alcohol moiety · CPC title

• C08F220/68

  Esters · CPC title

• C08F222/02

  Acids; Metal salts or ammonium salts thereof {, e.g. maleic acid or itaconic acid} · CPC title

• C08F222/16

  Esters having free carboxylic acid groups {, e.g. monoalkyl maleates or fumarates} · CPC title