Polyurethanes made from blends of polypropyleneoxide polyol and

Details Polyurethanes made from blends of polypropyleneoxide polyol and Polyurethanes made from blends of polypropyleneoxide polyol and

1988-07-14

1990-04-10

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 26, 528 29, 525453, 525456, 525440, 525460, C08G 7704

Patent

active

049161997

ABSTRACT:
A urethane sealant or coating composition is made from a physical blend of a polypropyleneoxide polyol intermediate and an organic-silicone block copolymer based polyol intermediate. The urethane prepolymer is made by reacting the physical intermediate blend with a polyisocyanate and preferably blocking the same with blocking agents such as phenols to prevent reaction with moisture in the air. Cure is effected through the utilization of curing agents such as polyamines or polyimines, for example, diamines, amine terminated polyethers, ketimines, aldimines, and the like. The sealant composition can contain various fillers, organosilanes, and the like. The prepolymers of the present invention generally have improved elongation and reduced modulus. Either a one-part or a two-part system can be utilized.

REFERENCES:
patent: 3629308 (1971-12-01), Bailey et al.
patent: 3867420 (1975-02-01), Morehouse et al.
patent: 4067844 (1978-01-01), Barron et al.
patent: 4507443 (1985-03-01), Barron et al.

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