E.i. Dupont De Nemours and Company

Charles Robert Bettler

Michael Patrick Diebold

Howard W Jacobson

Michael R Baloga

John Phillip Lanci, Sr

Phillip Martin Niedenzu

Michael Patrick Deibold

Max H Lewis

Anhtony John Coombe

The present invention relates to a TiOpigment coated sequentially in a wet treatment process with hydrous silica and hydrous alumina both in the presence of citric acid wherein the resulting pigment is coated with from 1 to 4% amorphous alumina based on the weight of the untreated TiO; from 3 to 6% silica glass based on the weight of the untreated TiO.

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The present invention relates to a TiO pigment coated sequentially in a wet treatment process with hydrous silica and hydrous alumina both in the presence of citric acid wherein the resulting pigment is coated with from 1 to 4% amorphous alumina based on the weight of the untreated TiO ; from 3 to 6% silica glass based on the weight of the untreated TiO .

Easy to disperse, high durability TiO2 pigment and method of making same

A process is provided to prepare durable, high gloss titanium dioxide pigments by a continuous wet treatment process which involves curing of a silica coating at pH of between 7.0 and 8.5. Pigment prepared in this fashion is substantially free from Al(OH).sub.3 impurities and has excellent performance properties in high quality latex paint formulations.

Continuous wet treatment process to prepare durable, high gloss titanium

A base TiO.sub.2 pigment particles bearing coatings of a boria-modified silica and alumina is disclosed.

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Newark, DE, United States of America

Charles Robert Bettler