Thermally stable reactive hot melt urethane adhesive composition having a thermoplastic polymer, a compatible, curing urethane polyalkylene polyol prepolymer and a tackifying agent
AssigneeH. B. Fuller Company
InventorsVirginia C. Markevka, John M. Zimmel, Elizabeth R. Messman, William L. Bunnelle
Life of this patent
Estimating the term…
Abstract
Hot melt adhesive compositions combining the characteristics of hot melt adhesives and reactive adhesives can be prepared by blending a 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 structural adhesive bond.
Claims28
A reactive hot-melt urethane adhesive composition having pot stability, initial green strength, bond heat stability, and cured bond strength which comprises:
- (a) a urethane prepolymer composition comprising the reaction product of a polyalkylene diol or triol and an isocyanate compound;
- (b) about 1 to 200 parts by weight per each 100 parts of the prepolymer composition of a thermoplastic polymer selected from the group consisting of an A-B-A block copolymer, an A-(B-A).sub.n -B block copolymer, and a radial A-B-A block copolymer wherein n is an integer from about 2-50, each A is a polystyrene block and each B is a rubbery block;
- and
- (c) about 1 to 200 parts by weight per each 100 parts of the prepolymer composition of an aliphatic, aromatic or mixed aliphatic-aromatic tackifying resin.
A reactive hot-melt urethane adhesive composition having pot stability, initial green strength, bond heat stability, and cured bond strength which comprises:
- (a) a urethane prepolymer composition comprising the reaction product of a polyalkylene diol or triol and an isocyanate compound;
- (b) about 1 to 200 parts by weight per each 100 parts of the urethane prepolymer of a structural thermoplastic polymer composition comprising an ethylene vinyl monomer copolymer having a melt index of about 0.1 to 1000 and a vinyl monomer content of about 10 to 40 wt-%;
- (c) about 1 to 200 parts by weight per each 100 parts of the prepolymer composition of an aliphatic, aromatic or aliphatic-aromatic tackifying resin.
A reactive hot-melt urethane adhesive composition having pot stability, initial green strength, bond heat stability, and cured bond strength which comprises:
- (a) a urethane prepolymer composition comprising the reaction product of a polyalkylene diol or triol and an isocyanate compound;
- (b) about 1 to 200 parts by weight per each 100 parts of the prepolymer composition of a thermoplastic structural polymer composition comprising a polyolefin polymer;
- and
- (c) about 1 to 200 parts by weight per each 100 parts of the prepolymer composition of an aliphatic, or aliphatic-aromatic tackifying resin.
Dependencies are inferred from the claim text.