Heat-resistant molded article of lactic acid-base polymer
US5691424A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 1995 |
| Grant date | Nov 25, 1997 |
| Priority date | — |
| Expiry date | May 25, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L67/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A preparation process of heat-resistant molded articles of a lactic acid-based polymer comprising mixing the lactic acid-based polymer and poly-.epsilon.-caprolactone so as to obtain a L-lactic acid ratio of 75% by weight or more, adding to the polymer mixture a crystalline inorganic powder containing 50% by weight or more of SiO.sub.2, melt-kneading the resultant composition, filling the same into a mold which is set at 85.degree..about.125.degree. C. and forming a shape while promoting crystallization. The molded articles have excellent heat resistance and impact strength, are suitably used for food trays and beverage cups, and can be degraded, in the case of waste, into nontoxic water and carbon dioxide like natural products within a relatively short period in the natural environment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.