Amphoteric starches and process for their preparation

Details Amphoteric starches and process for their preparation Amphoteric starches and process for their preparation

1989-07-31

1990-10-23

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

D21H 1728

Patent

active

049649531

ABSTRACT:
Improved non-crosslinked and non-degraded 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.

REFERENCES:
patent: 2884412 (1959-04-01), Neukom
patent: 2961440 (1960-11-01), Kerr et al.
patent: 3459632 (1969-08-01), Caldwell et al.
patent: 3562103 (1971-02-01), Moser et al.
patent: 4166173 (1979-08-01), Wurzburg et al.
patent: 4216310 (1980-08-01), Wurzburg et al.
patent: 4566910 (1986-01-01), Hubbard et al.
patent: 4579944 (1986-04-01), Harvey et al.

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