Papermaking additives and mechanical pulp with primary amino groups

US6455661B1 · kind B1 · utility

Assignee

• Pulp and Paper Research Institute of Canada · CA

Inventors

• Miroslav Antal · Rue du Bois des Loges, CA
• Makhlouf Laleg · Rue du Bois des Loges, CA
• Ivan I. Pikulik · Rue du Bois des Loges, CA

Key dates

• Filing date: Jul 2, 2001
• Grant date: Sep 24, 2002
• Expiry date: Jul 2, 2021

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H17/24
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A graft polymer comprises a carbohydrate polymer having pendant 3-amino-2-hydroxy propyl groups grafted thereon and may be employed as a retention aid and strengthening additive in paper manufacture. When the carbohydrate polymer is a component of wood pulp the resulting chemically modified wood pulp may be employed in conjunction with unmodified wood pulp to incorporate therein the retention and strengthening characteristics.