Patent Number: 6,169,138

Title: Foamed pressure sensitive tapes

Abstract: The present invention relates to a pressure sensitive adhesive foam with a percentage of theoretical density less than 90, wherein the foam has a peel adhesion of greater than about 1 N/cm and a compression set under constant deflection of less than about 60%. The present invention further includes a pressure sensitive adhesive foam comprising a thermoplastic block copolymer, a tackifying resin; an isocyanate terminated monomer or oligomer; a polymer comprising a backbone selected from the group consisting of polybutadiene, polyester and polyether, wherein the polymer contains at least 2 active hydrogens capable of reacting with the isocyanate terminated monomer; and expandable particulate materials. The present invention further includes a pressure sensitive adhesive foam comprising a thermoplastic olefin polymer or copolymer, having a density less than 0.91 g/cm.sup.3 and a torsion modulus less than 18 MPa, and a tackifying resin; and, optionally, plasticizing oil and expandable particulate materials, or glass microspheres. The invention finally further comprises a method of forming the above film.

Inventors: Petit; Dominique (Housse, BE), Ladang; Michel (Herve, BE)

Assignee: Saint-Gobain Performance Plastics Corporation

International Classification: C08J 9/32 (20060101); C08J 9/00 (20060101); C09J 123/10 (20060101); C09J 175/04 (20060101); C09J 5/08 (20060101); C09J 123/20 (20060101); C09J 123/04 (20060101); C09J 123/00 (20060101); C08L 23/02 (20060101); C08L 23/00 (20060101); C08L 91/00 (20060101); C08J 057/02 (); C08L 077/00 (); B32B 033/00 ()

Expiration Date: 01/02/2018