Activating plasticizer for urethane prepolymers and complex of a

Details Activating plasticizer for urethane prepolymers and complex of a Activating plasticizer for urethane prepolymers and complex of a

1984-03-05

1985-05-14

Cockeram, Herbert S.

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...

25218831, 528 48, 528 52, 528 64, C08G 1832, C08G 1816, C08G 1850, C08G 1848

Patent

active

045173311

ABSTRACT:
Storable polypropylene ether polyurethane compositions composed of (a) a prepolymer of a polypropylene ether glycol and sufficient organic polyisocyanate to give preferably an excess of about 3 to 15 percent NCO in said prepolymer with the proviso that the free NCO is obtained from methylenedi-p-phenyl diisocyanate and (b) a complex of an alkali metal salt with 4,4'-methylenedianiline (MDA), said composition being relatively inactive at temperatures below 100.degree. C., but being heat activatible at much higher temperatures to effect a cure. The improved composition wherein a catalyst is present in said composition which effectively lowers the cure temperature, said catalyst being a pseudocrown ether containing radicals having the formula --y--CH.sub.2 --CH.sub.2).sub.n with y being nitrogen, sulfur or oxygen and n has values sufficient to form the crown structure, viz., at least 3 or more.

REFERENCES:
patent: 3726835 (1973-04-01), Bertozzi
patent: 3755261 (1973-08-01), Van Gulick
patent: 3876604 (1975-04-01), Caruso
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patent: 3891606 (1975-06-01), Kogon
patent: 3899438 (1975-08-01), Kalil
patent: 3965073 (1976-06-01), Olstowski et al.
patent: 4182898 (1980-01-01), Fujiwara et al.
patent: 4282344 (1981-08-01), Caruso
patent: 4438251 (1984-03-01), Herweh

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