Intumescent flame-retardant coating compositions

US4009137A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Franz-Josef Dany · Lechenich, DE
• Joachim Wortmann · Kerpen, DE
• Joachim Kandler · Lechenich, DE

Key dates

• Filing date: Nov 26, 1974
• Grant date: Feb 22, 1977
• Expiry date: Nov 26, 1994

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D5/18
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Production of intumescent flame-retardant coating compositions which substantially contain a film-forming binder, an ammonium polyphosphate, one or more substances carbonizing under the action of heat, dispersing agents and fillers, if desired. The compositions contain more particularly an ammonium polyphosphate of the general formula: EQU H.sub.(n.sub.-m).sub.+2 (NH.sub.4).sub.m P.sub.n O.sub.3n.sub.+1 in which n stands for a whole number averaging a value of more than 400 up to about 800 and the ratio of m:n is about 1.