Process for the continuous production of biodegradable polyester polymer
US5484882A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1994 |
| Grant date | Jan 16, 1996 |
| Priority date | — |
| Expiry date | Jul 8, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides a process for the continuous production of a biodegradable polyester polymer with an excellent quality useful in the field of medicine, coating material and packaging material by eliminating difficulty in uniform agitation and heat removal caused by the rise in the viscosity of reactants in the production of a high molecular biodegradable polyester polymer by ring-opening polymerization. In some detail, the present invention provides a process for the continuous production of a biodegradable polyester polymer having a melt viscosity of not more than 500,000 poise and a weight-average molecular weight of not less than 10,000, which comprises continuously supplying monomers or polymers selected from the group consisting of intermolecularly cyclized ester of hydroxycarboxylic acid, lactone, and polymer having hydroxyl group and/or ester bond into a continuous reaction apparatus equipped with a static mixer where the reactants are subjected to continuous polymerization reaction at a polymerization temperature of 125.degree. to 270.degree. C., a maximum system reaction pressure of 2 to 15 Kg/cm.sup.2 and a conversion (one pass) of not less than 85% in the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.