Poly(urethane-urea) microcellular elastomer compositions

Details Poly(urethane-urea) microcellular elastomer compositions Poly(urethane-urea) microcellular elastomer compositions

1994-08-02

1995-01-17

Foelak, Morton

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 61, 528 64, 528 66, C08G 1810, C08G 1830, C08G 1832

Patent

active

053826469

ABSTRACT:
Poly(urethane-urea) reaction injection molded compositions having improved processing and lower water absorption are prepared by reacting an isocyanate-terminated prepolymer prepared by reacting 4,4'-MDI or modified 4,4'-MDI and a polyoxypropylene glycol having a molecular weight of from 400 to 2500 with a polyether polyol and a hindered amine or glycol chain extender, in the presence of a urethane-reaction promoting catalyst, optionally including a hydroxyl terminated chain extender and internal mold release agent.

REFERENCES:
patent: 4487912 (1984-12-01), Zimmerman et al.
patent: 4581386 (1986-04-01), Taylor et al.
patent: 4636531 (1987-01-01), Schmidt et al.
patent: 4738993 (1988-04-01), Markovs
patent: 4837245 (1989-06-01), Streu

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