Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1996-06-27
1998-07-28
Marcheschi, Michael
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
106444, 428403, 428404, C09C 136, C09C 306
Patent
active
057857482
ABSTRACT:
A method for the manufacture of a titanium dioxide pigment comprises mixing a suspension of titanium dioxide with a reagent formed by reacting concentrated phosphoric acid with aluminium or an aluminium compound at elevated temperature and adding an alkaline compound to the suspension until a pH value of at least 3.5 is achieved. A novel pigment which can be prepared by the method of the invention comprises titanium dioxide, the particles of which have a surface coating of aluminium phosphate in which the molar ratio of aluminium to phosphorus lies in the range 1.8:1 to 1:1.4 Al:P. The pigments prepared according to the invention are useful in the preparation of paper laminates.
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"The Chemistry and Binding Properties of Aluminum Phosphates", J.H. Morros et al., Chem. Soc. Reviews, 1977b Voll. 6, pp. 173-194. (No Month).
"Study of the Phosphates of Aluminum and Trivalent Iron. I. The Neutral Orthophosphate of Aluminum", F. d'Yvoire, Memories Presente a la Societe Chemique No. 372 pp. 1762-11776. (Original and Translation) (Date Unknown) .
Banford Jonathan
Demosthenous Maria Leonida
Maud Geoffrey Elliott
Marcheschi Michael
Tioxide Group Services Limited
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