PRODUCTION OF UREA RESIN PARTICLE AND INORGANIC COMPOUND PARTICLE

PURPOSE:To produce urea resin particles and inorganic compound particles which are insoluble in water and have broad particle diameter distributions, by separating the urea resin from an aqueous solution of a urea/formaldehyde precondensate by the addition of an acid and mixing the separated mother...

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Bibliographic Details
Main Authors TAKEUCHI KENJI, TAZAWA SHUNSUKE, ABE MITSUAKI, KURIHARA KATSUHIKO
Format Patent
LanguageEnglish
Published 09.02.1988
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Summary:PURPOSE:To produce urea resin particles and inorganic compound particles which are insoluble in water and have broad particle diameter distributions, by separating the urea resin from an aqueous solution of a urea/formaldehyde precondensate by the addition of an acid and mixing the separated mother liquor with a specified reagent. CONSTITUTION:Sulfuric and/or phosphoric acid as a gelling agent are added to an aqueous solution of a urea/formaldehyde precondensate of a formaldehyde to urea molar ratio of 0.5-2 hr to obtain a urea resin-containing product. This product is separated into a urea resin and a mother liquor by centrifugation. A reagent (e.g., zinc silicate) which can react with said gelling agent to form water-insoluble inorganic compound particles is added to the mother liquor, and the mixture is reacted at room temperature to 200 deg.C for 0.1-20 hr to obtain inorganic compound particles.
Bibliography:Application Number: JP19860172800