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US 5,663,241 AGranted
Removable pressure sensitive adhesive and article
AssigneeMinnesota Mining and Manufacturing Company
InventorsYorinobu Takamatsu, Kengo Imamura, Richard J. Goetz
Life of this patent
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Abstract
A removable pressure sensitive adhesive comprises pressure sensitive adhesive microparticles that are the polymerization product of a mono-olefinically unsaturated monomer having an aldehyde group or a ketone group, and a base monomer. By the addition of a polyhydrazide, other adhesives with improved properties can be provided.
Claims33
A removable pressure sensitive adhesive comprising:
- (a) pressure sensitive adhesive microparticles that are the suspension polymerization product of:
- (1) a mono-olefinically unsaturated monomer having an aldehyde group or a ketone group;
- and
- (2) a base monomer;
- (b) a polyhydrazide crosslinking agent for crosslinking the adhesive microparticles together;
- and
- (c) multifunctional free- radically polymerizable crosslinking agent for internally crosslinking the microparticles.
4 more elements
A removable pressure sensitive adhesive comprising:
- (a) pressure sensitive adhesive microparticles that are the suspension polymerization product of:
- (1) about 75 to 99.9 parts by weight of a free-radically polymerizable monomer selected from the group consisting of alkyl (meth)acrylate esters, vinyl esters, and mixtures thereof;
- (2) about 0.1 to 10 parts by weight of a mono-olefinically unsaturated monomer having an aldehyde group or a ketone group, each such monomer being independently selected from the group consisting of acrolein, vinyl methyl ketone, vinyl ethyl ketone, vinyl isobutyl ketone, diacetone (meth)acrylamide, formylstyrol, diacetone (meth)acrylate, acetonyl acrylate, 1,4-butanediol acrylate-acetyl acetate, and mixtures thereof;
- and
- (3) optionally, 0 to about 20 parts by weight of a polar monomer different than monomers (a)(1) and (a)(2);
- wherein the sum of(a)(1)+(a)(2)+(a)(3) is 100 parts by weight;
- and
- (b) about 0.5 to 150 milliequivalents per 100 grams of microparticles of a polyhydrazide crosslinking agent for crosslinking the adhesive microparticles together.
5 more elements
A removable pressure sensitive adhesive comprising:
- (a) pressure sensitive adhesive microparticles that are the suspension polymerization product of:
- (1) a mono-olefinically unsaturated monomer having an aldehyde group or a ketone group, and selected from the group consisting of acrolein, vinyl methyl ketone, vinyl ethyl ketone, vinyl isobutyl ketone, diacetone (meth)acrylamide, formylstyrol, diacetone (meth)acrylate, acetonyl acrylate, 1,4-butanediol acrylate-acetyl acetate, and mixtures thereof;
- and
- (2) a base monomer;
- and
- (b) a polyhydrazide crosslinking agent for crosslinking the adhesive microparticles together.
3 more elements
A method of preparing a pressure sensitive adhesive comprising the steps:
- (a) aqueous suspension polymerizing pressure sensitive adhesive microparticles;
- and
- (b) after step (a), adding to the aqueous suspension of pressure sensitive adhesive microparticles a polyhydrazide crosslinking agent for crosslinking the microparticles together.
Dependencies are inferred from the claim text.