Compositions: coating or plastic – Materials or ingredients
Patent
1978-05-30
1980-01-29
McCarthy, Helen M.
Compositions: coating or plastic
Materials or ingredients
106 72, 106308Q, 209 5, 209 11, 241 16, 241 20, 423264, 427361, C09C 142
Patent
active
041860276
ABSTRACT:
A process for treating a clay mineral of the kandite group comprising forming a fluid aqueous suspension of the clay mineral, the suspension having a solids content in the range of from 60% to 75% by weight and a pH in the range of from 7.0 to 11.0 and the suspension containing a dispersing agent to deflocculate the clay mineral; and treating the fluid suspension of clay containing the dispersing agent with a water-soluble reducing bleaching agent under alkaline pH conditions for a time sufficient to give the desired improvement in brightness of the clay. Preferably, the clay mineral suspension is subjected to a particle size separation process at said solids content to reduce the percentage of particles larger than 10.mu.m to not more than 3% by weight. Advantageously, the viscosity of the clay mineral suspension during the particle size separation process is below 2 poise.
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Handbook of Chem. & Physics--1970-- p. B-98, Calcium Orthophosphates.
Bell David G.
Gibson Keith R.
English Clays Lovering Pochin & Company Limited
McCarthy Helen M.
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