Amphoteric starches and process for their preparation

US4964953A · kind A · utility

Assignee

• National Starch and Chemical Investment Holding Copporation · US

Inventors

• Daniel B. Solarek · Somerville, US
• Teresa A. Dirscherl · North Plainfield, US
• Henry R. Hernandez · Somerville, US
• Wadym Jarowenko · Green Brook, US

Key dates

• Filing date: Jul 31, 1989
• Grant date: Oct 23, 1990
• Expiry date: Jul 31, 2009

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H17/29
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Improved non-crosslinked and non-degraded amphoteric starch derivatives containing tertiary amino or quaternary ammonium groups and anionic phosphate groups are disclosed. The derivatives which are defined by a minimum bound phosphorus content, a minimum viscosity and other criteria have use as wet-end additives and provide improved drainage properties in the manufacture of paper.