Copolymers for pressure-sensitive adhesives based on acrylic esters, (meth)acrylamide vinyl acetate and ethylene

US4322516A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Hubert Wiest · Burghausen, DE
• Rudolf Weissgerber · Burghausen, DE
• Erwin Lieb

Key dates

• Filing date: Mar 19, 1980
• Grant date: Mar 30, 1982
• Expiry date: Mar 19, 2000

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2891
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A copolymer having good properties for use as a pressure-sensitive adhesive from an aqueous dispersion comprising: PA1 (a) from 10% to 30% by weight of ethylene units, PA1 (b) from 29% to 69% by weight of acrylic ester units, PA1 (c) from 20% to 55% by weight of vinyl acetate units, PA1 (d) from 0.2% to 8% by weight of (meth)acrylamide units, and PA1 (e) from 0 to 12% of other olefinically-unsaturated monomer units copolymerizable with the above, said copolymer having a glass transition temperature of from -20.degree. C. to -60.degree. C. and a K-value according to Fikentscher, measured in tetrahydrofuran, of from 50 to 180; as well as processes to make the same and aqueous dispersions of the same for use as pressure-sensitive adhesives.