Polysaccharides grafted with aliphatic polyesters derived from cyclic esters
US5616671A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1996 |
| Grant date | Apr 1, 1997 |
| Priority date | — |
| Expiry date | Apr 15, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L101/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Novel synthetic pathways to derive aliphatic polyester-grafted polysaccharides from cyclic ester monomers, preferably, poly(.epsilon.-caprolactone) and starch. Different reaction schemes lead to compositions with various levels of grafting. The grafting reactions were conducted using bulk monomer and an organometallic polymerization agent (catalyst or initiator) such as metal alkoxides initiators which were generated in-situ by the reaction of metal alkyls with hydroxyl groups of the polysaccharide. The grafting reactions were characterized by very fast reaction times of the order of a few minutes to effect complete conversion of monomer. Biodegradable compositions, particularly using these poly(.epsilon.-caprolactone)-grafted starch are described for use in film applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.