Pressure-sensitive adhesives

US5412035A · kind A · utility

Assignee

• Landec Corporation · US

Inventors

• Edward E. Schmitt · Norwalk, US
• Raymond Clarke · Los Altos, US
• Andrew W. Larson · Livermore, US
• Steven Bitler · Menlo Park, US
• Ross S. Tsugita · Mountain View, US
• Donald A. Schultz · San Jose, US

Key dates

• Filing date: Aug 12, 1992
• Grant date: May 2, 1995
• Expiry date: Aug 12, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2852
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Pressure-sensitive adhesive (PSA) compositions containing a crystalline polymeric additive having an M.sub.w of less than 25,000 and a melting point (T.sub.a) greater than 23.degree. C., preferably 30.degree. to 60.degree. , and PSA composites of a backing, preferably a flexible backing, with such a PSA composition coated thereon. The presence of the additive causes the PSA to lose adhesive strength when heated to T.sub.a. The base resin of the PSA is preferably a polyacrylate or a styrene/butadiene copolymer. The additive, which is preferably present in amount 1 to 35%, e.g. 5 to 30%, is preferably a side chain crystallizable (SCC) polymer.