Moisture-curing hot-melt sealant

Details Moisture-curing hot-melt sealant Moisture-curing hot-melt sealant

1990-01-19

1991-07-23

Short, Patricia

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

525440, C08G 1866, C08L 7506

Patent

active

050344536

ABSTRACT:
A moisture-curing hot-melt sealant which comprises a polyurethane prepolymer which is prepared by reacting (a) a polyol component comprising a mixture of a thermoplastic saturated polyester polyol having a hydroxyl group at the terminus and having a molecular weight of 8,000 to 25,000 and a thermoplastic or liquid polyol having a hydroxyl group at the terminus and having a molecular weight of not more than 5,000 which is compatible with the thermoplastic saturated polyester polyol in a ratio of 1:1 to 1:8 by mole, and (b) a polyisocyanate compound having two or more isocyanate groups in the molecule thereof in an equivalent ratio of isocyanate group/hydroxyl group of 1.4 to 3 in admixture with the conventional additives. Said sealant has excellent heat resistance and initial properties and is suitable for adhering, for example, window glass of automobiles, particularly in cold district.

REFERENCES:
patent: 4443577 (1984-04-01), Higgins
The Condensed Chemical Dictionary, Eighth Edition, Van Nostrand Reinhold Company, 1971, p. 591.

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