Emery Industries, Inc.

James Lamont

Robert J Braun

Bruce J Beimesch

Thomas Z Li

Robert D Aylesworth

An improved process is provided for the amidation of carboxylic acids. For the process a carboxylic acid is reacted with ammonia gas at an elevated temperature and at atmospheric pressure or above in the presence of an alkyltin catalyst, preferably an alkyltin compound containing both hydroxyl and halo groups. High conversions are achieved with the process and the resulting products have low nitrile contents.

Process for the production of carboxylic amides using alkyltin catalysts

Copolyesters are provided which are derived from mixed dibasic acids and a branched-chain diol. These copolyesters possess a unique balance of physical and chemical characteristics which permits their use in small amounts in blood separation tubes to provide an effective barrier between the light and heavy phases of the blood after centrifuging.

Copolyesters useful in blood separation assemblies

Polyester plasticizers having improved low temperature properties are obtained by terminating the polyester with mixed chain-terminating agents. Mixtures of monobasic acids and monofunctional alcohols are employed for this purpose. The polyesters of this invention find particular utility as plasticizers for PVC homopolymers and copolymers.

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Cincinnati, OH, United States of America

James Lamont