Microcellular polyurethane elastomer and process for producing t

Details Microcellular polyurethane elastomer and process for producing t Microcellular polyurethane elastomer and process for producing t

1995-03-15

1996-12-17

Seidleck, James J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521172, 521173, 521174, C08J 912, C08G 1810

Patent

active

055854133

ABSTRACT:
A microcellular polyurethane elastomer obtained by mixing an NCO-terminated prepolymer, an OH-terminated prepolymer and a foaming component with stirring to cause foaming and curing is disclosed, in which the NCO-terminated prepolymer is (A) a prepolymer obtained by reacting a polyester polyol (a) having a number average molecular weight of 1,000 to 3,000 and diphenylmethane-4,4'-diisocyanate (MDI) or (B) a partially crosslinked prepolymer obtained by further reacting the reaction product of polyester polyol (a) and MDI with a low-molecular weight polyol, the OH-terminated prepolymer is (A) a prepolymer obtained by reacting polyester polyol (a) with a polyisocyanate or (B) a prepolymer obtained by reacting polyester polyol (b) and/or a polyether polyol both having a number average molecular weight of 500 to 3,000 with a polyisocyanate, and the foaming component contains water as a main blowing agent, which elastomer exhibits improved resistance to fatigue failure and permanent set in a fatigue test while retaining advantages of the use of MDI.

REFERENCES:
patent: 5240635 (1992-08-01), DeGenova et al.
patent: 5266606 (1993-11-01), Gilch et al.
patent: 5491175 (1996-02-01), Miyazaki et al.

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