Chemische Werke Huls Aktiengesellschaft

Chemische Werke Huels Aktiengesellschaft

Ralf Schuler

Gunther Maahs

A process for producing a copper(II) hydroxide phosphate having the Cu.sub.3 (PO.sub.4).sub.2.Cu(OH).sub.2 composition and having a light natural color and an average grain size less than 10 microns. Basic copper carbonate of a bulk density less than 800 grams per liter is treated in an aqueous dispersion with phosphoric acid at temperatures less than 70.degree. C. and the reaction mixture is then mechanically agitated further within the same temperature range. The copper phosphate so obtained is applicable as a smoke-reducing additive in polyvinyl or molding materials containing the same.

Production of copper(II) hydroxide phosphate with a light natural color

A polyvinyl chloride blend contains, as a smoke-reducing additive, a copper (II) hydroxide phosphate of the composition Cu.sub.3 (PO.sub.4).sub.2.Cu(OH).sub.2 in amounts from about 0.1 to 20 parts by weight per 100 parts by weight of polyvinyl chloride. The thus-treated polyvinyl chloride is not discolored by the addition of this copper compound a significant advantage when compared to conventional copper compound additives.

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Recklinghausen, Germany

Ralf Schuler