Patent ID: 6265570
Filing Date: 2001-07-24
Classification: C08B,D21H

Abstract:
A method of preparing a cold water soluble starch aldehyde composition comprising:a) forming a converted starch acetal having a water fluidity of from about 30 to 85, an acetal content represented by a degree of substitution (DS) of from about 0.005 to 0.25 and a structure selected from the group consisting of: ##STR5##wherein ST is starch; R is (CH.sub.2).sub.n or a divalent aromatic group where n is 0 to 22; R.sub.1, R.sub.6 and R.sub.7 are independently selected from the group consisting of hydrogen and a C.sub.1 to C.sub.22 alkyl, aryl, aralkyl or alkaryl group; R.sub.2, R.sub.5 and R.sub.8 are independently (CH.sub.2).sub.m where m from 1 to 6, R.sub.3 and R.sub.4 are independently hydrogen or an alkyl group having 1 to 6 carbon atoms; R.sub.9 is a divalent organic group containing no starch-reactive substituents, Y is an anion and A and A' are independently an alkyl group of 1 to 6 carbon atoms or together form at least a 5-membered cyclic acetal;b) cooking the acetal containing starch under acidic conditions to hydrolyze and form a dispersion of the corresponding starch aldehyde; andc) spray drying the resulting aldehyde at a pH of from about 4 to 7 to form a cold water soluble starch aldehyde powder.