Thermoplastic and biodegradable polysaccharide esters/polysaccharide ether esters containing maleic acid addition product groups

US5717087A · kind A · utility

Assignee

• Wolff Walsrode AG · DE

Inventors

• Jochen Kalbe · Leichlingen, DE
• Reinhard Koch · Kronshagen, DE
• Hanns P. Muller · Leverkusen, DE
• Jurgen Engelhardt · Bad Fallingbostel, DE
• Wolfgang Koch · Batavia, US
• Volkhard Muller · Bad Fallingbostel, DE

Key dates

• Filing date: Aug 2, 1996
• Grant date: Feb 10, 1998
• Expiry date: Aug 2, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W30/40
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The present invention relates to thermoplastic and biodegradable polysaccharide esters/polysaccharide ether esters, which are characterised in that they can be represented by the general structure ##STR1## wherein Polysaccharide-O represents the substituted OH groups of a polymeric saccharide unit and wherein A is a linear polyether chain of the following structure EQU A=(E--O)n wherein E signifies a linear aliphatic or aromatic branched or unbranched chain having 2 to 11 C atoms, n is an integer equal to or greater than 0 and both B and D are a maleic acid addition product of the following structure ##STR2## wherein F is an aliphatic, saturated, monounsaturated or polyunsaturated carbon skeleton, which may optionally be provided with further substituents and wherein C can be a hydrogen atom, one or more substituents from the group dihydroxyethyl, hydroxypropyl, hydroxybutyl, methyl, ethyl, benzyl, dihydroxypropyl, carboxyalkyl, sulphoalkyl or cyanoethyl.