Cationic modification of starch and use of the cationically modified starch

US5851300A · kind A · utility

Assignee

• BASF SE

Inventors

• Friedrich Linhart · Heidelberg, DE
• Andreas Stange · Mannheim, DE
• Rudolf Schuhmacher · Böhl-Iggelheim, DE
• Heinrich Hartmann · Schifferstadt, DE
• Walter Denzinger · Speyer, DE
• Manfred Niessner · Schifferstadt, DE
• Claudia Nilz · Rödersheim-Gronau, DE
• Wolfgang Reuther · Neckargemünd, DE
• Hubert Meixner · Ludwigshafen, DE

Key dates

• Filing date: Apr 29, 1997
• Grant date: Dec 22, 1998
• Expiry date: Apr 29, 2017

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H21/18
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

In a cationic modification process for starch, starch is reacted with polymers that contain amino and/or ammonium groups in an aqueous medium at temperatures from 115.degree. C. to 180.degree. C. under an increased pressure and in the absence of oxidizers, polymerization initiators and alkali. The reaction is conducted so that maximum 10% by weight starch has its molar weight reduced. Also disclosed is the use of the thus obtained reaction products as dry strength agents for paper.