Biodegradable absorbent material and method of manufacture
US9181377B2 · kind B2 · utility
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3References
20Claims
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Assignee
Inventor
Key dates
| Filing date | Jul 8, 2013 |
| Grant date | Nov 10, 2015 |
| Priority date | — |
| Expiry date | Sep 20, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F251/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Biodegradable graft copolymers derived from a carbohydrate and at least one α,β-unsaturated carboxylic acid derivative having superabsorbent properties are disclosed in addition to the substantially adiabatic polymerization process by which the graft copolymers are made. The methods disclosed can be carried out in a variety of currently available continuous commercial reactors. Polymerizations carried out with starch have surprisingly produced substantially quantitative yields of graft copolymer free of residual monomer produced as a moist copolymer. Product work-up typically involves an optional neutralization and drying.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.