Sodium tripolyphosphate, process for making it, and its use

US4454054A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Herbert Landgraber · Hürth, DE
• Werner Kowalski · Weilerswist, DE
• Johan Scheffer · Vlissingen, NL
• Hans Haas

Key dates

• Filing date: Jul 19, 1982
• Grant date: Jun 12, 1984
• Expiry date: Jul 19, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C11D3/062
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The disclosure relates to sodium tripolyphosphate containing up to 95 weight % phase-I, 0.1 to 22 weight % water of crystallization and 0.01 to 2.0 weight %, calculated as metal, of a compound of the metals selected from calcium, magnesium, zinc or strontium, the compound yielding ions in an aqueous medium. The disclosure also relates to a process for making the tripolyphosphate, and to its uses.