C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
154/122, 400/742
C09D 175/06 (2006.01) B32B 15/04 (2006.01) C03C 27/04 (2006.01) C08G 18/42 (2006.01) C08G 18/76 (2006.01) C09J 5/02 (2006.01) C09J 175/04 (2006.01)
Patent
CA 2035623
ABSTRACT In one aspect. this invention is a primer which comprises a solution of: (a) a polyester resin of a car- boxylic acid and a glycol; and (a) 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 0.25:1.0 to 2.0:1Ø In a second aspect, this invention is a primer which comprises a solution of: (a) 5 to 18 weight percent of a polyester resin of a carboxylic acid and a glycol; and (b) 6 to 17 weight percent of a polymeth- ylene poly(phenyl isocyanate), diphenylmethane diisocya- nate, or mixture thereof: in a volatile solvent. It has been discovered that the primer of the invention advan- tageously 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" ad- hesive comprised of an isocyanate-functional prepolymer and dimorpholinediethyl ether. 38,517-F
Essex Specialty Products Inc.
Smart & Biggar
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