Pressure-sensitive adhesive formulation comprising underindexed

Details Pressure-sensitive adhesive formulation comprising underindexed Pressure-sensitive adhesive formulation comprising underindexed

1990-06-04

1992-10-20

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 75, 528 77, 528 83, 528 85, 528 81, 528905, C08G 1862

Patent

active

051571013

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.

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patent: 4420603 (1983-12-01), Nelb, II et al.
patent: 4623593 (1986-11-01), Baier et al.
patent: 4722946 (1988-02-01), Hostettler

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