The Dow Chemical Company

Ruben L Krause

George E Ham

Russell T McFadden

Joseph M Baggett

Charles H Moore

James W Pischke

Russell B Kimbrell

Christian D Kneupper

The present invention is a process for producing halohydroxypropyltrialkylammonium halides by reacting a trialkylamine salt with an epihalohydrin, the improvement comprising using 1,3-dihalo-2-propanol as a cosolvent. Using that cosolvent reduces the amount of diquaternary, dichloropropanol, and epoxy by-products formed. The cosolvent is preferably separated from the reaction mixture and recycled for use with additional trialkylamine salt and epihalohydrin. The process is particularly useful in preparing chlorohydroxypropyltrimethylammonium chloride.

Preparation of halohydroxypropyl-trialkylammonium halides

Water-dispersible polymers of an acid salt of 2-aminoalkyl esters of monounsaturated monocarboxylic acid and at least one comonomer are prepared by dissolving the salt of that ester in a coupling solvent, mixing the comonomers as a separate feedstock and bringing the monomers together in a polymerization zone at a controlled rate so that the monomers remain in solution and polymerizing to substantial completion.

Water-thinnable coating compositions from aminoalkyl carboxylate

A thermoplastic polycarbonate formed by reacting a carbonate precursor such as phosgene, a dihydric phenol, and an epihalohydrin-dihydric phenol prepolymer under polycarbonate forming conditions.

Polycarbonates incorporating epihalohydrin residues

Novel cyclic oligomers of the formula ##STR1## ARE PREPARED BY CONTACTING (A) A STRONG PROTIC ACID WITH (B) AN N-substituted non-activated aziridine of the formula ##STR2## wherein R.sub.1 and R.sub.2 are independently hydrogen or lower alkyl and R.sub.3 is hydrogen, hydroxyl, cyano or an organic radical which is inert in the process. The process is typically conducted in an aqueous alkanol medium. E.g. the cyclic tetramer of N-phenethylaziridine was obtained as the predominant product by heating a solution of N-phenethylaziridine in aqueous ethanol at reflux temperatures in the presence of p-toluenesulfonic acid.

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Angleton, TX, United States of America

Ruben L Krause