Thermally stable reactive hot melt urethane adhesive composition having a thermoplastic polymer, a compatible, curing urethane polyester polyol prepolymer and a tackifying agent
AssigneeH. B. Fuller Company
InventorsVirginia C. Markevka, John M. Zimmel, Elizabeth R. Messman, William L. Bunnelle, Jeffrey M. Swoboda
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Abstract
Reactive hot melt adhesive compositions combining the characteristics of hot melt adhesives and curing urethane adhesive can be prepared by blending an ethylene-vinyl monomer thermoplastic polymer having sufficient structural integrity to provide cohesive strength with a urethane prepolymer and a tackifying agent. The composition has sufficient green strength to form initial bonds. Additionally, over time, the composition cures to a final rigid, resilient quality structural adhesive bond.
Claims13
A reactive hot melt urethane adhesive composition having extended pot stability, bond heat stability, green strength and cured bond strength which comprises:
- (a) a urethane prepolymer composition comprising the reaction product of an isocyanate compound and a polyester-polyol prepared by reacting a polyfunctional carboxylic acid compound and an aliphatic or cycloaliphatic diol or triol compound;
- (b) about 1 to 200 parts by weight per each one hundred parts of the prepolymer of a structural thermoplastic ethylene vinyl monomer copolymer composition having a melt index of about 0.2 to 1000 and a vinyl monomer content of about 10 to 60 wt-%;
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- (c) about 1 to 200 parts by weight per each one hundred parts by weight of the prepolymer of a compatible aliphatic, aromatic or aliphatic-aromatic tackifying resin.
Dependencies are inferred from the claim text.