Heat-activatable adhesive
Assignee3M Innovative Properties Company
InventorsAlbert I. Everaerts, Lang N. Nguyen
Life of this patent
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Abstract
Heat-activatable adhesives comprise a semi-crystalline polymer. The semi-crystalline polymer comprises alkyl (meth)acrylate monomer units having an alkyl group that contains at least about 20 carbon atoms, alkyl (meth)acrylate monomer units having an alkyl group that contains from about 4 to about 12 carbon atoms, and optionally ethylenically-unsaturated non-acidic polar monomer units. Methods for making heat-activatable adhesives and articles therefrom are also included.
Claims49
A heat-activatable adhesive comprising a semi-crystalline polymer, the semi-crystalline polymer comprising:
- (a) about 20 to about 70 percent by weight of alkyl (meth)acrylate monomer units having an alkyl group that contains at least about 20 carbon atoms;
- and
- (b) about 80 to about 30 percent by weight of alkyl (meth)acrylate monomer units having an alkyl group that contains from about 4 to about 12 carbon atoms, wherein the polymer has an activation temperature of at least about 40 degrees Celsius, and wherein the polymer is essentially free of acidic groups.
A heat-activatable adhesive comprising a semi-crystalline polymer, the semi-crystalline polymer comprising:
- (a) about 20 to about 70 percent by weight of alkyl (meth)acrylate monomer units having an alkyl group that contains at least about 20 carbon atoms;
- (b) about 80 to about 30 percent by weight of alkyl (meth)acrylate monomer units having an alkyl group that contains from about 4 to about 12 carbon atoms;
- and
- (c) ethylenically-unsaturated non-acidic polar monomer units in an amount of less than about 20 percent by weight, wherein the polymer has an activation temperature of at least about 40 degrees Celsius, and wherein the polymer is essentially free of acidic groups.
A method of making a heat-activatable adhesive comprising:
- (a) providing a mixture of polymerizable components comprising about 20 to about 70 percent by weight of alkyl (meth)acrylate monomer having an alkyl group that contains at least about 20 carbon atoms, about 80 to about 30 percent by weight of alkyl (meth)acrylate monomer having an alkyl group that contains from about 4 to about 12 carbon atoms;
- and
- (b) polymerizing the mixture to provide a semi-crystalline polymer, wherein the semi-crystalline polymer has an activation temperature of at least about 40 degrees Celsius, and wherein the polymer is essentially free of acidic groups.
A heat-activatable adhesive article comprising:
- a substrate having a major surface;
- and
- a layer of heat-activatable adhesive comprising a semi-crystalline polymer and supported on at least a portion of the major surface, wherein the semi-crystalline polymer comprises:
- (a) about 20 to about 70 percent by weight of alkyl (meth)acrylate monomer units having an alkyl group that contains at least about 20 carbon atoms;
- and
- (b) about 80 to about 30 percent by weight of alkyl (meth)acrylate monomer units having an alkyl group that contains from about 4 to about 12 carbon atoms, wherein the polymer is crosslinked, wherein the polymer has an activation temperature of at least about 40 degrees Celsius, and wherein the semi-crystalline polymer is essentially free of acidic groups.
Dependencies are inferred from the claim text.