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

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

C - Chemistry, Metallurgy

08

B

260/221

C08B 31/04 (2006.01) C09D 103/06 (2006.01)

Patent

CA 1281717

ABSTRACT Preparation of a starch ester having an ?n of 1000-50 000 and a degree of substitution of 0,4-3,0, by heating a mixture of starch, a C1-7 monocarboxylic acid, water, and optionally a catalyst and meanwhile withdrawing water until the ester being formed has attained the desired degree of substitution. Optional- ly remaining free hydroxyl groups may be esterified by reaction with a carboxylic anhydride or halide. The resulting solution may be treated to neutralize remaining free monocarboxylic acid by mixing it with an esterifiable hydroxyl compound and esteri- fying it at 40-270°C under the removal of water. In this way, use is made of cheap ingredients, and the resulting product is suit- able for immediate use in a number of applications, e.g., as binder in coating compositions.

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