Process for the preparation of an ester from starch and a monoca

Details Process for the preparation of an ester from starch and a monoca Process for the preparation of an ester from starch and a monoca

1986-05-08

1988-01-19

Michl, Paul R.

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

Organic compounds

Carbohydrates or derivatives

536107, C08B 3104

Patent

active

047205440

ABSTRACT:
Preparation of a starch ester having an Mn of 1000-50,000 and a degree of substitution of 0.4-3.0 by heating a mixture of starch, a Cl-7 monocarboxylic acid, water, and optionally a catalyst and meanwhile withdrawing water until the ester being formed has attained the desired degree of substitution. Optionally remaining free hydroxyl groups may be esterified by reaction with a carboxylic anhydride of -halide. The resulting solution may be treated to neutralize remaining free monocarboxylic acid by mixing it with an esterifiable hydroxyl compound and esterifying it at 40.degree.-270.degree. under the removal of water. In this way, use is made of cheap ingredients, and the resulting product is suitable for immediate use in a number of applications, e.g., as binder in coating compositions.

REFERENCES:
patent: 3513156 (1970-05-01), Speakman
patent: 3720662 (1973-03-01), Tessler
patent: 3928666 (1975-12-01), Morrison
patent: 4011392 (1977-03-01), Rudolph
patent: 4501888 (1985-02-01), Schmidt

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