The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 20, 1992
Filed:
Jun. 04, 1990
Robert B Orr, Wilmington, DE (US);
Norwood Industries, Inc., Malvern, PA (US);
Abstract
A pressure-sensitive adhesive prepared from a two-package polyurethane system; the two packages comprise an isocyanate reactant and an active hydrogen reactant. The reactants are characterized by a molar insufficiency of isocyanate and at least some tri- or higher-functionality in either the active hydrogen or the isocyanate reactant, or both. The underindexing should range from 0.4 to 0.75 when the higher functionality reactant has a functionality of 2.1, and should range from 0.3 to 0.7 when the higher functionality reactant has a functionality of 4, with linearly extrapolated values in between. Pressure sensitive adhesives prepared from this system provide comparable shear resistance as do solvent-system polyurethane adhesives, without the worksite and environmental problems associated with such solvent systems.