Adhesive compositions

US4618651A · kind A · utility

Assignee

• USM Holding AG · US

Inventors

• Heinz G. Gilch · Bad Homburg vor der Höhe, DE
• Hubertus von Voithenberg · Bad Homburg vor der Höhe, DE
• Karl-Heinz Albert · Oberursel, DE

Key dates

• Filing date: Aug 19, 1985
• Grant date: Oct 21, 1986
• Expiry date: Aug 19, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2666/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Novel, solvent free adhesive compositions comprising a moisture curable polyurethane formed from a first component comprising a diisocyanate, and a second component comprising a substantially linear hydroxy polyester in proportions to provide a prepolymer having from 1.0 to 2.0 percent by weight --NCO groups available for reaction, and a third component comprising a monofunctional reactant present in an amount sufficient to react with 1-40 mole % of the reactive --NCO groups of the product of the prepolymer reaction. A layer of applied adhesive may be exposed to airborne moisture under relatively mild conditions to bring about chain extension of the moisture curable polyurethane, after which the layer of the adhesive composition may be heated to bring it to tacky adhesive condition. The chain extended adhesive composition is storable for at least several days without affecting the bond strength.