Malic acid polymers

US4265247A · kind A · utility

Assignee

• AGRESEARCH LIMITED · US

Inventors

• Robert W. Lenz · Hochdorf-Assenheim, DE
• Michel Vert · Castelnau-le-Lez, FR

Key dates

• Filing date: Nov 7, 1979
• Grant date: May 5, 1981
• Expiry date: Nov 7, 1999

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61L17/105
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A polymer containing repeating units of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are independently hydrogen, alkyl, aryl, aralkyl, substituted alkyl, substituted aryl, substituted aralkyl, R.sub.3 is hydrogen, alkyl or --CH.sub.2).sub.n COOR.sub.8 where n is an integer of 0 to 10, R.sub.6 is OR or NR.sub.4 R.sub.5, wherein R and R.sub.8 are independently hydrogen or a group derived from a compound containing esterifiable hydroxyl groups, R.sub.4 and R.sub.5 are independently alkyl, aryl, aralkyl, substituted alkyl, substituted aryl, substituted aralkyl or together comprise an alkylene group.