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US 6,777,079 B2Granted
Crosslinked pressure sensitive adhesive compositions, and adhesive articles based thereon, useful in high temperature applications
Assignee3M Innovative Properties Company
InventorsZhiming Zhou, Lori P. Engle
Life of this patent
Estimating the term…
Abstract
Pressure sensitive adhesive compositions, and adhesive articles based thereon, crosslinked using a bis-amide crosslinking agent that are thermally stable, yet cleanly removable from a variety of substrates following exposure to high temperatures.
Claims32
An adhesive article comprising:
- (1) a backing;
- and
- (2) a pressure sensitive adhesive composition on said backing, said composition comprising the reaction product of:
- (A) a copolymer comprising the reaction product of (a) a (meth)acrylate ester of a non-tertiary alcohol in which the alkyl group contains between 1 and 8 carbon atoms, inclusive, and whose homopolymer has a glass transition temperature no greater than about 0° C.;
- and (b) a carboxylic acid-functional, ethylenically unsaturated co-monomer;
- and
- (B) a bis-amide crosslinking agent having the formula:
- where R1 and R3 independently, are selected from the group consisting of H and CnH2n+1 where n is an integer ranging from 1 to 5, and R2 is a divalent radical selected from the group consisting of benzeno (—C6H4—), substituted benzeno, triazine, CmH2m where m is an integer ranging from 1 to 10, and combinations thereof, the relative amounts of said co-monomer and said crosslinking agent being selected such that (i) the ratio of the number of equivalents of amide groups to the number of equivalents of carboxylic acid groups is at least about 0.5,
- wherein the pressure sensitive adhesive composition comprises no greater than 10% by weight of a tackifier and no greater than 2% by weight of a plasticizer.
6 more elements
A pressure sensitive adhesive composition comprising the reaction product of:
- (A) a copolymer comprising the reaction product of (a) a (meth)acrylate ester of a non-tertiary alcohol in which the alkyl group contains between 1 and 8 carbon atoms, inclusive, and whose homopolymer has a glass transition temperature no greater than about 0° C.;
- and (b) a carboxylic acid-functional, ethylenically unsaturated co-monomer;
- and
- (B) a bis-amide crosslinking agent having the formula:
- where R1 and R3 independently, are selected from the group consisting of H and CnH2n+1 where n is an integer ranging from 1 to 5, and R2 is a divalent radical selected from the group consisting of benzeno (—C6H4—), substituted benzeno, triazine, CmH2m where m is an integer ranging from 1 to 10, and combinations thereof,
- the relative amounts of said co-monomer and said crosslinking agent being selected such that (i) the ratio of the number of equivalents of amide groups to the number of equivalents of carboxylic acid groups is at least about 0.5,
- wherein the pressure sensitive adhesive composition comprises no greater than 10% by weight of a tackifier and no greater than 2% by weight of a plasticizer.
4 more elements
A process for protecting a substrate comprising:
- (A) applying an adhesive article to the substrate, said adhesive article comprising:
- (1) a backing;
- and
- (2) a pressure sensitive adhesive composition on said backing, said composition comprising the reaction product of:
- (a) a copolymer comprising the reaction product of (i) a (meth)acrylate ester of a non-tertiary alcohol in which the alkyl group contains between 1 and 8 carbon atoms, inclusive, and whose homopolymer has a glass transition temperature no greater than about 0° C.;
- and (ii) a carboxylic acid-functional, ethylenically unsaturated co-monomer;
- and
- (b) a bis-amide crosslinking agent having the formula:
- where R1 and R3 independently, are selected from the group consisting of H and CnH2n+1 where n is an integer ranging from 1 to 5, and R2 is a divalent radical selected from the group consisting of benzeno (—C6H4—), substituted benzeno, triazine, CmH2m where m is an integer ranging from 1 to 10, and combinations thereof,
- wherein the ratio of the number of equivalents of amide groups to the number of equivalents of carboxylic acid groups is at least about 0.5;
- wherein the pressure sensitive adhesive composition comprises no greater than 10% by weight of a tackifier and no greater than 2% by weight of a plasticizer;
- (B) heating said adhesive article and said substrate at a temperature within the range of about 150° C. to about 230° C.;
- and p1 (C) cleanly removing said adhesive article from said substrate following heat exposure.
10 more elements
An adhesive article comprising:
- (1) a backing;
- and
- (2) a pressure sensitive adhesive composition on said backing, said composition comprising the reaction product of:
- (A) a copolymer comprising the reaction product of (a) a (meth)acrylate ester or a non-tertiary alcohol in which the alkyl group contains between 1 and 14 carbon atoms, inclusive, and whose homopolymer has a glass transition temperature no greater than about 0° C.;
- and (b) a carboxylic acid-functional, ethylenically unsaturated co-monomer;
- and
- (B) a bis-amide crosslinking agent having the formula:
- where R1 and R3 independently, are selected from the group consisting of H and CnH2n+1 where n is an integer ranging from 1 to 5, and R2 is a divalent radical selected from the group consisting of benzeno (—C6H4—), substituted benzeno, triazine, CmH2m where m is an integer ranging from 1 to 10, and combinations thereof, the relative amounts of said co-monomer and said crosslinking agent being selected such that (i) the ratio of the number of equivalents of amide groups to the number of equivalents of carboxylic acid groups is at least about 0.5,
- wherein the pressure sensitive adhesive composition comprises no greater than 10% by weight of a tackifier and no greater than 2% by weight of a plasticizer.
6 more elements
Dependencies are inferred from the claim text.