Adhesive compositions

Details Adhesive compositions Adhesive compositions

1985-08-19

1986-10-21

Bleutge, John C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

523167, 524270, C08L 2300

Patent

active

046186514

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.

REFERENCES:
patent: 3437622 (1969-04-01), Dahl
patent: 3931077 (1976-01-01), Uchigaki et al.
patent: 4071505 (1978-01-01), Meckel et al.

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