Novel starch ether derivatives, a method for the preparation the

Details Novel starch ether derivatives, a method for the preparation the Novel starch ether derivatives, a method for the preparation the

1979-08-15

1981-01-06

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

D21H 328

Patent

active

042434793

ABSTRACT:
Starch ether derivatives are prepared by reacting a starch base with N-(2-haloethyl)iminobis(methylene)diphosphonic acid or with a N-(alkyl)-N-(2-haloethyl)aminomethylphosphonic acid. The derivatives contain aminophosphonic acid groups (or their salts) as zwitterion substituents which consist of either one or two anionic methylene phosphonic acid groups bound to a cationic nitrogen. Their cationic or anionic characteristics may be increased by introducing suitable cationic or anionic groups either by simultaneous reaction with the aminophosphonic acid reagent or by consecutive reaction either prior to or subsequent to the aminophosphonic acid reaction. They are especially useful as pigment retention aids in paper making processes.

REFERENCES:
patent: 3059411 (1962-12-01), Hjermstad
patent: 3459632 (1969-08-01), Caldwell et al.
patent: 3562103 (1971-02-01), Moser et al.
patent: 3721523 (1973-03-01), Tesoro
patent: 4017460 (1977-04-01), Tessler
patent: 4119487 (1978-10-01), Tessler

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