Patent · US Expired

Method for the production of fillers and flame retardants based on gibbsite and application in plastics

US5100641A · kind A · utility

4Cited by

3References

20Claims

0Family size

Assignee

Vereinigte Aluminum - Werke Aktiengesellschaft · DE

Inventors

Hubertus Schmidt · Pocking, DE
Albrecht Husmann · Bornheim, DE

Key dates

Filing date	Feb 13, 1989
Grant date	Mar 31, 1992
Priority date	—
Expiry date	Feb 13, 2009

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01P2004/61
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process is disclosed for producing aluminum hydroxide in the form of gibbsite in particular shapes, suitable for use as a filler, flame retardant and/or fibrous reinforcement. The process includes the steps of crystallizing gibbsite from a Bayer process sodium aluminate liquor, in the presence of an additive comprising either a hydroxycarboxilic acid for producing needle shaped, rod-like hydrargillite or in the presence of a polyalcohol, fatty acid or lithium compound for producing platy or tabular gibbsite.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.