Hercules Corporation

Johan Jozef Einerhand

Leonardus Johannes Erkens

Gerardus Johannes Colbers

Herman Jozef Geurts

Jacobus Michiel Snijders

Wilhelmus Martha Huck

Rene Johannes Laenen

Joseph Wilhelmus Hoofs

Hubertus Bartholomeus Nicola

The production of iron blue pigment compositions by a flushing process has been found to be improved by carrying out the flushing step in the presence of an amine flushing agent and incorporating into the composition during or after flushing at least one surfactant of the polyoxyethylene type. The resulting iron blue compositions have improved consistency and dispersibility in printing inks, paints and the like.

Iron blue pigment composition and process for its production

Metal phthalocyanines having a narrow particle size distribution are synthesized via the phthalodinitrile or phthalic anhydride-urea route using hexachlorobutadiene as the diluent. Higher yields and shorter reaction times are also realized by carrying out the syntheses in this manner.

Synthesis of metal phthalocyanines

A process for the production of lead sulfochromate or lead chromate-sulfate-molybdate type pigments having a low content of acid soluble lead, good color and tinting properties and excellent resistance to industrial environments is described. The process comprises forming the desired lead chromate-containing precipitate in acidic aqueous medium containing chloride ions and a specified excess of lead ions in the absence of a pH buffering agent, coating the precipitate with a silicon and antimony compound, adjusting the pH of the medium to below 7 and recovering the coated precipitate as a pigment.

Method for the manufacture of a lead chromate-containing pigment having

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Maastricht, Netherlands

Johan Jozef Einerhand