Polyurethane contact adhesives with improved temperature resista

Details Polyurethane contact adhesives with improved temperature resista Polyurethane contact adhesives with improved temperature resista

1997-01-22

1998-03-31

Niland, Patrick D.

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...

524589, 528 44, 528 60, 528 66, 528 76, 528 77, 528 85, C08J 300, C08K 320, C08L 7500, C08G 1800

Patent

active

057339660

ABSTRACT:
The present invention relates to highly elastic polyurethane contact adhesives, a process to coat substrates with these contact adhesives, and the coated substrates produced by this process. This invention requires a) a polyisocyanate with a functionality of less than about 4 and b) a polyol blend comprising 1) about 90 to 100% polyethers with molecular weights from about 1,800 to 12,000 and average functionality from about 1.5 to about 4, and 2) up to about 10% of chain extenders with molecular weights from about 60 to 400 and average functionality from about 1.5 to about 3. The functionalities and amounts of components a) and b) are such that the molecular weight between crosslinks is from about 7,000 to about 16,000 and the equivalent ratio of isocyanate groups to isocyanate-reactive groups is from about 80:100 to about 120:100 and the urethane group content is from about 1 to about 8%. It is preferred that at least one of components a) and b) have a functionality of greater than about 2.2.

REFERENCES:
patent: 3779794 (1973-12-01), De Santis
patent: 4156064 (1979-05-01), Falkenstein et al.
patent: 4624996 (1986-11-01), Rizk et al.
patent: 4625012 (1986-11-01), Rizk et al.
patent: 5102714 (1992-04-01), Mobley et al.
patent: 5227409 (1993-07-01), Mobley et al.

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