Method for stabilizing polymers containing repeating lactic acid units, and stabilized polymers so made
US8114939B2 · kind B2 · utility
2Cited by
4References
17Claims
0Family size
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Key dates
| Filing date | May 12, 2008 |
| Grant date | Feb 14, 2012 |
| Priority date | — |
| Expiry date | May 12, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L101/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Metal catalyst residues in resins containing polymerized lactic acid units, such as polylactides, are deactivated by treatment with a polymer or copolymer that contain pendant acid groups and pendant ester groups, with an acid-containing PLA resin, or with a polymer or copolymer having at least one acid groups per 250 atomic mass units and which has pendant lactic acid or poly(lactic acid) groups. The deactivating agent is effective at deactivating the catalyst, and has little effect on the optical clarity of the resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.