High viscosity crosslinked ethoxy-starch
US9732163B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 2, 2014 |
| Grant date | Aug 15, 2017 |
| Priority date | — |
| Expiry date | Jan 2, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2103/0062
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Described herein is an ethoxylated starch crosslinked with a cross linking agent having surprisingly high viscosity in water. The ethoxylated crosslinked starch described has a degree of ethoxy substitution from 1% to 3% and the crosslinking agent is from 0.02% to 0.05% of the weight of starch. Within this narrow range of values, a 7% wt/wt aqueous solution of the crosslinked ethoxylated starch exhibits a viscosity of at least 1600 cps at 95 ° C. This ethoxylated crosslinked starch is particularly useful in the formation of ceiling tiles with stucco, borax and steel wool, and should be useful in enhancing the viscosity of hydraulic fracturing fluids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.