Production method of biodegradable plastic and apparatus for use in production thereof
US7279545B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 2003 |
| Grant date | Oct 9, 2007 |
| Priority date | — |
| Expiry date | Dec 4, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2219/00779
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides a production method of biodegradable plastic in which polylactic acid is directly synthesized from lactic acid without employing the conventional route of polylactic acid synthesis from lactic acid via lactide, and apparatus for use in production thereof. In this way, time required for the synthesis of polylactic acid is strikingly shortened and the production cost is reduced. In the production method of biodegradable plastic, polylactic acid, the main component of biodegradable plastic, is obtained by means of condensation polymerization by dehydration of the raw material, lactic acid, under high temperature and reduced pressure in the presence of a metal catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.