Polyurethane sealants made using high molecular weight polyols p

Details Polyurethane sealants made using high molecular weight polyols p Polyurethane sealants made using high molecular weight polyols p

1989-10-05

1991-01-15

Welsh, Maurice J.

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...

528 59, 528 60, 528 61, 528 64, 528 65, C08L 7504

Patent

active

049854917

ABSTRACT:
This invention relates to a method of fabricating a polyurethane sealant composition employing a polyether triol having a molecular weight of between about 5,000 and about 30,000 and having a level of end group unsaturation of no greater than 0.04 milliequivalents per gram of triol, wherein the triol is fabricated in the presence of a double metal cyanide catalyst. The triol is reacted, alone or in admixture with a diol, with a polyisocyanate to produce an isocyanate-terminated prepolymer. The prepolymer is then chain-extended to produce the desired sealant.

REFERENCES:
patent: 3829505 (1974-08-01), Herold
patent: 3941849 (1976-03-01), Herold
patent: 4335188 (1982-06-01), Igi et al.
patent: 4355188 (1982-10-01), Herold et al.
patent: 4472560 (1984-09-01), Kuyper et al.
patent: 4477589 (1984-10-01), van der Hulst et al.

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