Polyalkyloxazoline-reinforced acrylic pressure-sensitive adhesive composition
First Claim
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1. 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.
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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.
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21 Claims
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1. A normally tacky pressure-sensitive adhesive composition comprising a blend of the following:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification