Thermoplastic biodegradable polyester a process for the preparation thereof and articles manufactured therefrom

Jukka Seppälä (Inventor), Mika Härkönen (Inventor), Kari Hiltunen (Inventor), Johan-Fredrik Selin (Inventor), Jyrki Hakola (Inventor)

Research output: Patent

Abstract

PCT No. PCT/FI96/00183 Sec. 371 Date Nov. 6, 1997 Sec. 102(e) Date Nov. 6, 1997 PCT Filed Apr. 3, 1996 PCT Pub. No. WO96/31552 PCT Pub. Date Oct. 10, 1996The invention concerns a novel melt-processible copolyester and a process and prepolymer for the preparation thereof. The copolyester contains structural units derived from a polyester and structural units derived from diepoxy, and the polyester units at least essentially consist of hydroxy acid monomers. The bonds between the structural units are ester bonds and the number average molar mass, Mn, is at least 10,000 g/mol, its weight average molar mass, Mw, is over 20,000 g/mol and molar mass distribution, expressed as the ratio Mw/Mn, is over 2. The copolyester is hydrolytically degradable and it can be used as a biodegradable polymer for the manufacture of injection moulded articles as well as thermoformed and blow moulded packages, pouches, sacks and bottles, for the coating of sacks bags and films made from paper or cardboard and for the preparation of fibres, fibre cloths and expanded polymer articles.

Original languageEnglish
Patent numberUS5925726
IPCC09J 167/ 04 A I
Priority date03/04/1996
Publication statusPublished - 20 Jul 1999
MoE publication typeH1 Granted patent

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