Biodegradable polymers, preparation thereof and use thereof for producing biodegradable moldings

US6303677A · kind A · utility

Assignee

• BASF SE

Inventors

• Volker Warzelhan · Bad Dürkheim, DE
• Gunnar Schornick · Neuleiningen, DE
• Bernd Bruchmann · Ludwigshafen, DE
• Ursula Seeliger · Ludwigshafen, DE
• Motonori Yamamoto · Mannheim, DE
• Peter Bauer · Ludwigshafen, DE

Key dates

• Filing date: Jul 7, 2000
• Grant date: Oct 16, 2001
• Expiry date: Jul 7, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31794
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Biodegradable polyesters P1 obtainable by reaction of a mixture consisting essentially of PA1 (a1) a mixture consisting essentially of PA2 from 35 to 95 mol % of adipic acid or ester-forming derivatives thereof or mixtures thereof, PA2 from 5 to 65 mol % of terephthalic acid or ester-forming derivatives thereof or mixtures thereof, and PA2 from 0 to 5 mol % of a sulfonate compound, the sum of the individual mole percentages being 100 mol %, and PA1 (a2) a dihydroxy compound selected from the group consisting of C.sub.2 -C.sub.6 -alkanediols and CS-C.sub.10 -cycloalkanediols, the molar ratio of (a1) to (a2) being chosen within the range from 0.4:1 to 1.5:1, with the proviso that the polyesters P1 have a molecular weight (M.sub.n) within the range from 5000 to 50,000 g/mol, a viscosity number within the range from 30 to 350 g/ml (measured in 50:50 w/w o-dichlorobenzene/phenol at a concentration of 0.5% by weight of polyester P1 at 25.degree. C.) and a melting point within the range from 50 to 170.degree. C. and with the further proviso that the polyesters P1 are prepared using from 0.01 to mol %, based on the molar quantity used of component (a1), of a compound D having at least thre…