Blush resistant adhesives used in bottle labeling
AssigneeAir Products and Chemicals, Inc.
InventorsDavid Horwat, Richard Szuchyt
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Abstract
This invention is directed to an improvement in acrylic based adhesives that are particularly suited for use in the application of paper and plastic labels onto glass surfaces, such as in bottle labeling. The base adhesive is comprised of an emulsion polymerized acrylic copolymer having acid functionality, e.g., carboxyl or sulfonic acid functionality; wherein the emulsion polymerization is carried out in the presence of a stabilizer system comprising a polymer containing polymerized units of carboxylic acid. The improvement for enhancing the blush resistance of the adhesive resides in incorporating a long chain crosslinking polyamine or polyamide containing residual amines.
Claims12
In a bottle labeling adhesive emulsion formed by the emulsion polymerization of at least one alkyl ester of acrylic acid in the presence of a stabilizer system comprised of a polymer containing polymerized units of a carboxylic acid monomer, the improvement in blush resistance of said adhesive which comprises:
- addition of from 0.25 to 5 weight parts of a long chain hydrophobic polyamine or a long chain hydrophobic polyamide containing residual amines per 100 weight parts of the acrylic polymer in said adhesive emulsion.
Dependencies are inferred from the claim text.