National Starch and Chemical Investment Holding Corporation

Lawrence J Scotchie

Martin M Tessler

Dennis Neigel

Kelly J Seheult

Shane M Carter

A process for the manufacture of copolymers of formaldehyde and diphenyl oxide and a carboxylic acid uses and acid with a pKa in the range of 1.2 to 3 as the catalyst.

Process for the manufacture of copolymers of formaldehyde and diphenyl oxide

A process for purifying 1,3-bis(aminophenoxy benzene) (APB) on a manufacturing scale to at least 99.5% purity comprises the sequential steps of (a) forming the dihydrochloride salt of APB (hereinafter APB-HCl), (b) recrystallizing the APB-HCl from isopropyl alcohol, and (c) converting the APB-HCl to free APB.

Process for recrystallizing 1,3-bis(aminophenoxy benzene)

A process for preparing biodegradable, high humidity resistant crosslinked starch esters comprising reacting starch with monocarboxylic acid anhydride in a caustic catalyzed system to a DS of about 1.3 to 2.7 and crosslinking the starch ester in the same reaction mixture with polyfunctional acid and/or anhydride.

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Charlotte, NC, United States of America

Lawrence J Scotchie