Abstract: This invention relates to a process for preparing cold water hydrating starch which, when hydrated in water, produces a short creamy textured paste, especially useful in instant pudding formulations. These properties are attained without the use of the classical types of polyfunctional crosslinking reagents such as epichlorohydrin, phosphorus oxychloride, acrolein, etc. This process comprises treating starch with from 0.1% to 1% chlorine (preferably 0.4-0.6%) as sodium hypochlorite to inhibit the starch, but not to degrade or depolymerize it, and then reacting the inhibited starch with an alkylene oxide to produce a hydroxypropyl starch having a degree of substitution of about 15.5% to about 18.5%.

Abstract: This disclosure covers the use of an acid treated, high fluidity, high degree of substitution, waxy maize cationic starch in the flocculation and dewatering of municipal raw primary sludge. From 0.007 to 0.200% (based on the dry weight of the sludge) of the treated starch of about 30 to about 50 fluidity is added to raw primary municipal sludge and contacted with the sewage before the mixture is dewatered to a moisture content below about 70% moisture, which is the moisture level at which the solids will adequately sustain combustion. The starch has from about 0.15 to about 0.25 degree of substitution of an amine butene halide, specifically, 4-chloro-2-butenyl-trimethylammonium chloride.

Abstract: This application relates to an improvement in the preparation of quaternary ammonium alkene halides which are used in the production of cationic starch. The quaternary ammonium alkene halide product is recovered in a water solution which reduces exposure to and handling of the product by production workers, both in the manufacturing plant and in its subsequent use in a starch processing plant.