UREA-FORMALDEHYDE FILLER PRODUCTION PROCESS Russian patent published in 2005 - IPC

FIELD: polymer production.

SUBSTANCE: production of urea-formaldehyde filler, useful as synthetic white filler in manufacture of polymers, paper, and varnish-and-paint materials, is accomplished by interaction of urea with urea-formaldehyde concentrate modified in synthesis stage with 1 to 20% of uranium derivatives and containing 54.5-59.5% formaldehyde, 21.0-24.5% urea, the rest water. Synthesis is carried out in aqueous medium in presence of phosphoric acid at elevated temperature, after which reaction mixture is neutralized with chalk/aminoalcohol/aqueous ammonia mixture [(1-4):(1-4):(1-5)]. Aminoalcohol is a product composed of 30-70% monoethanolamine, 10-50% mixture of 1-(2-hydroxyethyl)imidazol-2-ine and 1-(2-hydroxyethyl)ethylenediamine, and water (no more than 20%).

EFFECT: enhanced process efficiency and lowered oil absorption.

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