Primer composition for improving the bonding of a urethane adhes

Details Primer composition for improving the bonding of a urethane adhes Primer composition for improving the bonding of a urethane adhes

1990-02-06

1992-05-19

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528274, 528283, 528288, 5283086, 528 48, 528 54, 528 58, 528 67, 528 83, 525437, 525440, 524178, 524186, 524241, C08G 6320, C09D16702

Patent

active

051150867

ABSTRACT:
In one aspect, this invention is a primer which comprises a solution of: (a) a polyester resin of a carboxylic acid and a glycol; and (b) a polymethylene poly(phenyl isocyanate), diphenylmethane diisocyanate, or mixture thereof; in a volatile solvent, wherein the weight ratio of (a):(b) is in the range of from about 0.25:1.0 to 2.0:1.0. In a second aspect, this invention is a primer which comprises a solution of: (a) 5-18 weight percent of a polyester resin of a carboxylic acid and a glycol; and (b) 6-17 weight percent of a polymethylene poly(phenyl isocyanate), diphenylmethane diisocyanate, or mixture thereof; in a volatile solvent. It has been discovered that the primer of the invention advantageously provides improved adhesion characteristics of metal-to-glass bonding when used to prime paint-coated metal substrates before the application of a urethane adhesive, particularly when used with a "fast cure" adhesive comprised of an isocyanate-functional prepolymer and dimorpholinediethyl ether.

REFERENCES:
patent: 3152162 (1964-10-01), Fischer et al.
patent: 3459584 (1969-08-01), Caldwell
patent: 3707521 (1972-12-01), De Santis
patent: 3779794 (1973-12-01), De Santis
patent: 4020049 (1977-04-01), Rinehart
patent: 4224376 (1980-09-01), Ishige et al.
patent: 4418188 (1983-11-01), Smith et al.
patent: 4511626 (1985-04-01), Schumacher
patent: 4525511 (1985-06-01), Kirby et al.
patent: 4643794 (1987-02-01), Saracsan et al.

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