Process for the production of cationic starch ethers

US4332935A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Wolfgang Fischer · Meerbusch, DE
• Manfred Langer · Hanau, DE
• Gerhard Pohl · St. Georgen, DE

Key dates

• Filing date: Dec 8, 1980
• Grant date: Jun 1, 1982
• Expiry date: Dec 8, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08B31/125
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The known process for the production of cationic starch ethers by the reaction of starch with cationic etherifying agents in the presence of water in an alkaline medium is improved by reacting the starch at a temperature of about 50.degree. to 120.degree. C. with an alkylidene epoxide which has a tertiary amino group or quaternary ammonium group in a medium which contains about 10 to 35 weight percent water and about 0.2 to 2.0 weight percent calcium hydroxide or calcium oxide. There are produced in short reaction times yields not previously attainable.