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US 4,737,410 AGranted
Polyalkyloxazoline-reinforced acrylic pressure-sensitive adhesive composition
AssigneeMinnesota Mining and Manufacturing Company
InventorSteven S. Kantner
Life of this patent
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Abstract
Pressure-sensitive adhesives comprise blends of acrylate copolymer copositions with polyalkyloxazolines. The blends exhibit enhanced cohesive strength with balanced adhesive properties and are useful as coatings for sheet materials.
Claims21
A normally tacky pressure-sensitive adhesive composition comprising a blend of the following:
- a. acrylic or methacrylic copolymer having an inherent viscosity greater than about 0.2 comprising copolymerized A and B monomers wherein:
- A is at least one free radically polymerizable vinyl monomer, at least one of which is an acrylic or methacrylic acid ester of a non-tertiary alcohol having from 1 to 18 carbon atoms with the average number of carbon atoms being about 4-12;
- and
- B is at least one polar monomer copolymerizable with A, the amount by weight of B monomer being up to about 30% of the total weight of all monomers in the copolymer;
- b. up to about 150 parts by weight of compatible tackifying resin per 100 parts by weight copolymer;
- c. up to about 50 parts by weight of compatible plasticizer per 100 parts by weight copolymer;
- and
- d. sufficient polyalkyloxazoline of a molecular weight above about 1,000 to provide the resultant blend with increased shear strength.
5 more elements
Dependencies are inferred from the claim text.