Urethane compositions

Details Urethane compositions Urethane compositions

1985-04-18

1986-04-01

Welsh, Maurice J.

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 60, 528 61, 528 62, 528 63, 528 64, 528 65, 528 66, C08G 1810, C08G 1812

Patent

active

045799288

ABSTRACT:
Urethane elastomers are produced by initially adding at least one incremental amount of a curing agent to a urethane prepolymer, having free polyisocyanate therein. Generally, free polyisocyanate-curing agent adducts are precipitated. Subsequently, the remaining amount of curing agent is added. Chain extension, accordingly, is favored which produces hard segment domains more evenly distributed in the polymer chain and imparts improved physical properties such as hardness, tear strength and high-low strain modulus.

REFERENCES:
patent: 3697483 (1972-10-01), Damusis
patent: 4267299 (1981-05-01), Oechsle
patent: 4532316 (1985-07-01), Henn

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