Amphoteric starch containing carboxyl and cationic groups
US5417755A · kind A · utility
3Cited by
4References
3Claims
0Family size
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Key dates
| Filing date | Jun 21, 1994 |
| Grant date | May 23, 1995 |
| Priority date | — |
| Expiry date | Jun 21, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08B31/185
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An amphoteric starch containing carboxyl and cationic groups 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. The process for producing the amphoteric starch 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.