Paper containing a urea-formaldehyde pigment

A white, bright and opaque urea formaldehyde pigment in slurry form, useful as a paper filler, is produced by precipitating in slurry form a UF resin or prepolymer having a water tolerance of from about 1.5 - 2.0 and a viscosity of from about 450-1500 cps at 50 percent solids in an aqueous bath cont...

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Bibliographische Detailangaben
Hauptverfasser:	GRIFFITHS, DARRELL J. L, HUANG, DENIS K
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON DYES GENERAL PROCESSES OF COMPOUNDING IMPREGNATING OR COATING OF PAPER LAKES MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS MORDANTS NATURAL RESINS ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING POLISHES PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PULP COMPOSITIONS TEXTILES THEIR PREPARATION OR CHEMICAL WORKING-UP TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G WORKING-UP
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Beschreibung
Zusammenfassung:	A white, bright and opaque urea formaldehyde pigment in slurry form, useful as a paper filler, is produced by precipitating in slurry form a UF resin or prepolymer having a water tolerance of from about 1.5 - 2.0 and a viscosity of from about 450-1500 cps at 50 percent solids in an aqueous bath containing from about 0.125 - 1.0 percent of an acid catalyst by introducing the UF resin into the aqueous acid catalyst precipitating bath over a period of time of from about 15 minutes to an hour, under agitation, and at a temperature of from about 25 DEG -90 DEG C., at a resin to water ratio of from about 1/16 to 3/8, said total reaction time requiring from about 1/2 to 5 hours.