Foamed pressure sensitive tapes
US5780523A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1997 |
| Grant date | Jul 14, 1998 |
| Priority date | — |
| Expiry date | Jun 17, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/905
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a pressure sensitive adhesive foam with a percentage of theoretical density less than 90 wherein the foam has an intrinsic 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 of 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 invention finally further comprises a method of forming the above film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.