Lignin derivative polymers

US4769434A · kind A · utility

Assignee

• South African Inventions Development Corporation · ZA

Inventors

• Gerrit H. Van der Klashorst · Pretoria, ZA
• Antonio Pizzi · Chantraine, FR
• Flora-Anne Cameron · Roodepoort, ZA

Key dates

• Filing date: Jun 17, 1986
• Grant date: Sep 6, 1988
• Expiry date: Jun 17, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L97/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A polymer material of the product of reaction of a grass plant lignin derivative comprising lignin polymer fragments recovered from black liquor obtained in the pulping of grass plant material and containing an average of more than 0.4 sites per phenyl propane unit of the polymer fragments reactive to base catalyzed substitution and condensation reactions, with an electrophilic compound which is capable of reacting twice at one side or at least once at each of two different sites.