Primer composition for improving the bonding of a urethane adhesive
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United States of America Patent
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May 19, 1992
Grant Date -
N/A
app pub date -
Feb 6, 1990
filing date -
Feb 6, 1990
priority date (Note) -
Expired
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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.
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