Flame-retardant filler for plastics

US7829619B2 · kind B2 · utility

Assignee

• ALBEMARLE CORPORATION · US

Inventors

• Thomas Dittmar · Wiesbaden, DE
• Bernhard Hentschel · Cologne, DE
• Genoveva Bilandzic · Cologne, DE
• Mario Neuenhaus · Elsdorf, DE
• Rene Herbiet · Eupen, BE

Key dates

• Filing date: Oct 12, 2006
• Grant date: Nov 9, 2010
• Expiry date: Sep 17, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K2003/2227
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a flame-retardant filler based on aluminium hydroxide, its use in polymers and a method for its production, in which aluminium hydroxide in the form of bayerite or a bayerite/gibbsite mixture is modified under pressure at temperatures of at least 170° C. in the presence of water and crystal growth regulator, the aluminium hydroxide used as starting material having an average particle size d50 from 0.1 to 4 μm.