Continuous process for making urea formaldehyde pigment

Details Continuous process for making urea formaldehyde pigment Continuous process for making urea formaldehyde pigment

1975-07-03

1977-07-12

Tillman, Murray

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

162166, 162167, 260 676R, 260 69R, 260 70A, 260 70M, 260 70R, 260 71, 260849, C08L 6120, C08G 1212, C08G 1402, C08G 228

Patent

active

040353281

ABSTRACT:
A white, bright and opaque urea formaldehyde pigment is prepared in a continuous process by precipitating a urea formaldehyde resin or prepolymer having a relatively low water tolerance and a relatively high viscosity in an aqueous precipitating bath containing an acid catalyst. The reaction is carried out by supplying the urea formaldehyde resin to one or more reactors each containing the precipitating bath at an elevated temperature and under agitation, wherein a precipitate begins to form almost immediately. The reaction is allowed to progress for a length of time sufficient to permit most of the higher molecular weight fractions of the resin to precipitate out, the precipitate is then filtered preferably at the reaction temperature, washed and collected. Meanwhile, the filtrate from the reaction is recycled back through the reactor or reactors whereupon additional urea formaldehyde resin is added along with an effective amount of a synthetic polymeric flocculant to assist in converting the lower molecular weight fractions of the resin in the recycled filtrate into a useful product. The synthetic polymeric flocculant also controls the solids content and optical efficiency of the precipitate produced.

REFERENCES:
patent: 3849378 (1974-11-01), Griffiths et al.

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