Amphoteric starches and process for their preparation
US4876336A · kind A · utility
10Cited by
8References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 18, 1987 |
| Grant date | Oct 24, 1989 |
| Priority date | — |
| Expiry date | May 18, 2007 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/29
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Improved amphoteric starch derivatives containing tertiary amino or quaternary ammonium groups and anionic phosphate groups are disclosed. The derivatives which are defined by a minimum bound phosphorus content, a minimum viscosity and other criteria have use as wet-end additives and provide improved drainage properties in the manufacture of paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.