Biodegradable packaging thermoplastics from lactides
US5180765A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 6, 1990 |
| Grant date | Jan 19, 1993 |
| Priority date | — |
| Expiry date | Sep 6, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2666/28
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Environmentally biodegradable compositions of poly(lactic acid) plasticized with lactic acid, D-lactide, L-lactide, meso D,L-lactide, racemic D,L-lactide, oligomers of lactic acid, oligomers of lactide, derivatives of oligomers of lactic acid, or various mixtures thereof; the compositions are suitable replacements of thermoplastic polymer compositions; the compositions are useful for pliable films and other packaging applications conventionally served by polyethylene and other nondegradable thermoplastics; homopolymers or copolymers of D-lactic acid, L-lactic acid, D-lactide, L-lactide, meso D,L-lactide, and/or racemic D,L-lactide having properties similar to other known polymers may be prepared by varying the ratios of monomer and polymerization conditions, the amount and type of plasticizer in the polymer and process conditions; additives and subsequent treatment are also used to modify properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.