Polyurethanes cured with 4,4'-methylene-bis-(3-chloro-2,6-diethy

Details Polyurethanes cured with 4,4'-methylene-bis-(3-chloro-2,6-diethy Polyurethanes cured with 4,4'-methylene-bis-(3-chloro-2,6-diethy

1996-11-27

2000-04-04

Gorr, Rachel

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 64, 528 67, C08G 1810

Patent

active

060462973

ABSTRACT:
Polyurethane prepolymers are disclosed prepared with mononuclear aromatic diisocyanate such as toluene diisocyanate and an aliphatic diisocyanate such as H12MDI. These prepolymers can be cured with 4,4'-methylene-bis-(3-chloro-2,6-diethylaniline) to form a cured urethane elastomer with reduced propensity to crack during the curing process, extended pour life (a slower rate of viscosity buildup after curative and prepolymer are mixed), low hysteresis, and a low level of free toluene diisocyanates and/or other toxic or volatile substances to increase worker safety during processing. It has also been found that prepolymers made from toluene diisocyanate and cured with a blend of two aromatic diamine curatives yields urethane elastomers with the same reduced propensity to crack during the curing process.

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