Method for manufacturing high-cationic starch solutions

Details Method for manufacturing high-cationic starch solutions Method for manufacturing high-cationic starch solutions

2005-02-15

2005-02-15

Wilson, James O. (Department: 1623)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

C536S102000

Reexamination Certificate

active

06855819

ABSTRACT:
The invention relates to a method for producing starch solutions of high cation equivalent value (with a DS of 0.1-1.0). The starch to be cationized, advantageously an oxidized starch, is slurried to form a suspension of about 10-80% solids content in an aqueous mixture of a cationizing agent. In the cationization 2,3-epoxypropyltrimethylammonium chloride or an equivalent chlorohydrin-functional cationizing agent is used by about 90-1100 g per kg starch solids, and a catalyst is added to the slurry. The reaction is carried out at a high solids content of 40-80%, preferably 50-60%, in at least two successive steps, in the first of which a temperature of about 5-40° C. is maintained, and in the second step a temperature of about 70-180° C.

REFERENCES:
patent: 3422087 (1969-01-01), Caesar et al.
patent: 3654263 (1972-04-01), Cescato
patent: 4146515 (1979-03-01), Buikema et al.
patent: 4464528 (1984-08-01), Tasset
File WPI, Derwent Accession No. 89-050139, Showa Denko KK: “Appts. for continuous preparation of cationized starch—has tank to form slurry with starch and epoxide-contg. quat. ammonium salt, cooker to form paste by contact with steam, etc.”,JP, A, 1006001, 890110, DW 8907. Abstract Only.

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