Process for making improved urea/formaldehyde foams

Details Process for making improved urea/formaldehyde foams Process for making improved urea/formaldehyde foams

1974-09-04

1976-06-15

Turer, Richard B.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

23252R, 260851, C08J 900

Patent

active

039636500

ABSTRACT:
Improved low-density, self-sustaining urea/formaldehyde foams are prepared by separate foaming of an aqueous solution of a urea/formaldehyde resin and a foaming agent to form a first foam, and foaming an aqueous solution of a hardener and a foaming agent to form a second foam, and mixing the two foams in a liquid feed ratio of resin to hardener of at least 4:1 according to the disclosed process. The resin feed may be preheated prior to foaming. Using resins of high solids content produces foams of relatively low density.

REFERENCES:
patent: 3063952 (1962-11-01), Vieli
patent: 3150108 (1964-09-01), Vieli
patent: 3186959 (1965-06-01), Shriver et al.
patent: 3329631 (1967-07-01), Pilgrim
patent: 3377139 (1968-04-01), MacGregor et al.
patent: 3393161 (1968-07-01), Avis et al.

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