Acrylic copolymer elastomers

• US 4,975,508 A
• Filed: 11/10/1988
• Issued: 12/04/1990
• Est. Priority Date: 11/10/1987
• Status: Expired due to Fees

• Current Assignee: Tosoh Corporation
• Original Assignee: Tosoh Corporation
• Inventors: Hayashi, Takao, Kamezawa, Mitsuhiro
• Primary Examiner(s): Lipman, Bernard
• Application Number:
  US07/269,392
• Time in Patent Office: 754 Days
• Field of Search: 526/273, 526/292.6, 558/442
• US Class Current: 526/273
• CPC Class Codes: C07C 255/14 containing cyano groups and esterified hydroxy groups bound to the carbon skeleton
• CPC Class Codes: C08F 20/36 containing oxygen in addition to the carboxy oxygen , e.g. 2-N-morpholinoethyl (meth)acrylate or 2-isocyanatoethyl (meth)acrylate
• CPC Class Codes: C08F 220/1802 C2-(meth)acrylate, e.g. ethyl (meth)acrylate
• CPC Class Codes: C08F 220/1804 C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
• CPC Class Codes: C08F 220/325 containing glycidyl radical, e.g. glycidyl (meth)acrylate
• CPC Class Codes: C08F 222/322 Alpha-cyano-acrylic acid ethyl ester, e.g. ethyl-2-cyanoacrylate

Abstract

An acrylic copolymer elastomer is disclosed, comprising (A) from 94.5 to 50% by weight of ethyl arcylate or ethyl arcylate containing not more than 50% by weight of n-butyl acrylate, (B) from 5 to 50% by weight of an arcylic acid ester and/or a methacrylic acid ester represented by formula (I): ##STR1## wherein the symbols are as defined in the appended claims, and (C) from 0.5 to 10% by weight of at least one of allyl glycidyl ether and glycidyl methacrylate, or vinyl chloroacetate, and having a Mooney viscosity (ML₁₊₄, 100° C.) of at least 10. This is a novel copolymer elastomer which is excellent in fuel resistance and low-temperature resistance.

Claims

1. An acrylic copolymer elastomer comprising:

(A) from 94.5 to 50% by weight of ethyl acrylate or ethyl acrylate containing not more than 50% by weight of n-butyl acrylate based on component (A);

(B) from 5 to 50% by weight of an acrylic acid ester and/or a methacrylic acid ester represented by formula (I);

##STR5## wherein R¹ is hydrogen or methyl group, and n is an integer of 1 or more and the number average value thereof is 1 to 5; and

(C) from 0.5 to 10% by weight of at least one of allyl glycidyl ether and glycidyl methacrylate, or vinyl chloroacetate, and having a Mooney viscosity, ML₁₊₄ at 100°

C. of at least 10.

2. An acrylic copolymer elastomer as in claim 1, wherein the component (B) is present in an amount of from 10 to 40% by weight of said elastomer.

3. An acrylic copolymer elastomer as in claim 1, wherein the component (C) is present in an amount of from 0.5 to 5% by weight of said elastomer.

4. An acrylic copolymer elastomer as in claim 1, having a Mooney viscosity, ML₁₊₄ at 100°

C. of from 20 to 80.

5. An acrylic copolymer elastomer as in claim 1, wherein the component (B) contains 2-cyanoethyl acrylate or 2-cynoethyl methacrylate.

6. An acrylic copolymer elastomer as in claim 5, wherein said 2-cyanoethyl acrylate or 2-cyanoethyl methacrylate is present in an amount of not more than 20% by weight of the component (B) based on the entire polymer.

7. An acrylic acid ester and/or methacrylic acid ester represented by formula (I):

##STR6## wherein R¹ is a hydrogen or methyl group, and n is an integer of 1 or more and the number average value thereof is 1 to 5.