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Abstract

A method for making a pressure sensitive adhesive comprising:

(a) reacting (i) at least one dibasic or polybasic carboxylic acid or anhydride thereof with (ii) at least one first epoxidized fatty acid at a stoichiometric molar excess of reactive carboxylic acid groups relative to reactive epoxy groups to produce a thermoplastic prepolymer or oligomer capped with a carboxylic acid group at both prepolymer or oligomer chain ends, or a thermoplastic branched prepolymer or oligomer with at least two of the prepolymer or oligomer branches and chain ends capped with a carboxylic acid group; and(b) curing the resulting carboxylic acid-capped prepolymer or oligomer with at least one difunctional epoxide or polyfunctional epoxide, and optionally at least one second epoxidized fatty acid, to produce a pressure sensitive adhesive, wherein the difunctional epoxide or polyfunctional epoxide is not an epoxidized vegetable oil.

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First Claim