Process for the manufacture of urea-formaldehyde/polyurethane po

Details Process for the manufacture of urea-formaldehyde/polyurethane po Process for the manufacture of urea-formaldehyde/polyurethane po

1982-09-29

1984-03-06

Cockeram, H. S.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521129, 521136, 521137, 524779, 528 57, C08G 1814, C08G 1818, C08G 1854

Patent

active

044355262

ABSTRACT:
Novel polymers of excellent heat- and flame-resistance are obtained by reacting together an aqueous solution of an aminoplast precondensate such as a urea-formaldehyde syrup, an organic polyisocyanate comprising di(isocyanatophenyl)methane or a mixture of di(isocyanatophenyl)methane with poly(isocyanatophenyl)polymethylenes, and an isocyanate-reactive organic polyol in the presence of a tertiary amine as catalyst and a poly(haloalkyl)phosphate, especially tris-(2-chloroethyl)phosphate.
Under normal circumstances, foamed materials are obtained, but non-foamed materials can be obtained by carrying out the reaction in the presence of a CO.sub.2 absorbent.

REFERENCES:
patent: 3632531 (1972-01-01), Rush et al.
patent: 4002584 (1977-01-01), Takahashi et al.
patent: 4176217 (1979-11-01), Goeser et al.
patent: 4334971 (1982-06-01), Mahnke et al.
patent: 4376294 (1983-01-01), Hahn et al.

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