Use of starch dispersions as binder in coating compositions and process for preparing the starch dispersions

US6825252B2 · kind B2 · utility

Assignee

• ECOSYNTHETIX INC. · CA

Inventors

• Andre Helbling · Wetzikon, CH
• Michael Robert Hills · Midland, US
• Friederike Stollmaier · Bühl, DE
• Thomas Annen · Saarlouis, DE

Key dates

• Filing date: Jul 23, 2003
• Grant date: Nov 30, 2004
• Expiry date: Jul 23, 2023

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H19/54
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Coating compositions comprising a pigment and starch dispersion of discrete crosslinked starch particles in an aqueous liquid. The dispersion may be used as coating color for paper. A preferred process of preparing the dispersion of starch particles comprises (a) obtaining a mixture of starch and an aqueous liquid; (b) processing the mixture using shear forces in the presence of a crosslinker in an extruder; and (c) injecting a hydroxylic liquid into the extruder and dispersing the mixture inside the extruder or outside the extruder or both inside and outside the extruder to obtain the dispersion.