Reactive hot melt adhesive
AssigneeH. B. Fuller Licensing & Financing, Inc.
InventorsKevin J. Reid, Gary J. Haider, John M. Zimmel
Life of this patent
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Abstract
A hot melt curing urethane adhesives with heat stability, green bond strength and fully cured bond strength that are surprisingly compatible in production and use. The reactive hot melt adhesive composition includes a composition including an isocyanate compound; a polyester-polyol compound; a reactive tackifying resin including non-polar polyols; and a thermoplastic polymer. The components of the adhesive composition cooperate in at least some embodiments to form a hot melt compatible adhesive composition that has substantial initial green strength, substantial cured bond strength, chemical and heat resistance when cured, extended pot life, long open times, high heat resistance, (i.e., high PAFT), and good adhesion to plastics.
Claims37
A hot melt adhesive composition comprising:
- (a) an isocyanate compound;
- (b) a polyester-polyol;
- (c) a reactive tackifying resin comprising a non-polar polyol having a hydroxyl number of about 50 or less;
- and
- (d) a thermoplastic polymer.
A hot melt adhesive composition comprising:
- (a) an isocyanate compound;
- (b) a polyester-polyol;
- (c) a reactive tackifying resin comprising a non-polar polyol, wherein the reactive tacking resin is selected from the group consisting of a terpene-phenolic copolymer resin, a rosin acid/diepoxy, a hydroxy modified rosin ester and mixtures thereof, and (d) a thermoplastic polymer.
A method of increasing temperature resistance and open time in a hot melt adhesive composition, the method comprising incorporating into said adhesive an isocyanate compound, a polyester-polyol, and a reactive tackifying resin comprising a non-polar polyol having a hydroxyl number about 50 or less.
A process for making a hot melt adhesive composition, the process comprising:
- (a) providing a polyester-polyol component;
- (b) adding to the polyesterpolyol component a reactive tackifying resin comprising a non-polar polyol having a hydroxyl number of about 50 or less and a thermoplastic polymer to form a first mixture;
- and thereafter
- (c) adding an isocyanate compound to the first mixture.
Dependencies are inferred from the claim text.