Polyurethane adhesive compositions modified with a dicarbamate ester useful in laminating substrates
AssigneeNational Starch and Chemical Corporation
InventorHenry Stanley
Life of this patent
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Abstract
A modified polyurethane adhesive composition characterized by its improved bond strength and curing properties contains an isocyanate-terminated prepolymer and from 2.5 to 100% by weight, based on the prepolymer, of a dicarbamate ester compatible with the prepolymer and containing two free isocyanate groups. The resultant adhesive is suitable for hot-melt applications in bonding flexible substrates.
Claims9
An improved modified polyurethane adhesive composition comprising an isocyanate-terminated prepolymer having a molecular weight of at least about 1000, and 2.5-100% by weight, based on said prepolymer, of a dicarbamate ester reaction product of two moles of an organic diisocyanate and one mole of a dihydroxy compound, of the general formula:
- ##STR2## wherein R is a divalent hydrocarbon radical and R.sup.1 is a divalent aliphatic radical, and said dicarbamate esters is compatible with said prepolymer and has a molecular weight no greater than 800.
Dependencies are inferred from the claim text.