Process for the oxidation of cationic starches and amphoteric starches, containing carboxyl and cationic groups, thus obtained
US5383964A · kind A · utility
27Cited by
18References
19Claims
0Family size
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Key dates
| Filing date | Mar 22, 1993 |
| Grant date | Jan 24, 1995 |
| Priority date | — |
| Expiry date | Mar 22, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08B31/185
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This process consists in reacting a cationic starch in aqueous solution with hydrogen peroxide and hydrobromic acid or bromine, so as to oxidize selectively the hemiacetal groups of the cationic starch and, where appropriate, the hemiacetal groups of its products of acid hydrolysis, to give carboxyl groups. The amphoteric starch containing carboxyl and cationic groups, thus obtained, is characterized in that its carboxyl groups originate from the selective oxidation of the hemiacetal groups of the cationic starch and possibly of the hemiacetal groups of its products of acid hydrolysis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.