Polyisocyanate compositions for the preparation of flexible poly

Details Polyisocyanate compositions for the preparation of flexible poly Polyisocyanate compositions for the preparation of flexible poly

1994-07-28

1995-07-25

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521159, 521161, 521174, C08G 1804, C08G 1810

Patent

active

054362776

ABSTRACT:
The invention provides a liquid polyisocyanate prepolymer composition which is a result of combining about 50 to 90 percent by weight of an isocyanate blend (a.) having 55 to 75 weight percent 4,4'-MDI, 17 to 27 weight percent 2,4'-MDI, 1 to 10 weight percent 3-ring MDI oligomer, and 1 to 15 weight percent n-ring MDI oligomer (n greater than 3); about 5 to 30 weight percent of a polyhydroxy containing polyol (b.) having a molecular weight of from 700 to about 6,000, and about 5 to 15 weight percent of a toluene diisocyanate (c.). The resulting isocyanate prepolymer composition has a free NCO content of from about 20 to 40 weight percent and particularly desirable flow characteristics. The invention further provides a method of making an isocyanate prepolymer composition, a process of making a polyurethane foam utilizing the isocyanate prepolymer composition of the invention, and polyurethane foams produced by the disclosed process.

REFERENCES:
patent: 3124605 (1964-03-01), Wagner
patent: 3492251 (1970-01-01), Gemeinhardt
patent: 3909464 (1975-09-01), Anorga
patent: 4256849 (1981-03-01), Ick
patent: 4801644 (1989-01-01), Googan
patent: 4803229 (1989-02-01), Narayan
patent: 5132334 (1992-07-01), Gansen et al.

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