E.i. Dupont De Nemours and Company

Gurdial Singh

Hamid M Ghorashi

Robert B Croman

Harry Vaughn Samuelson

Richard Edward Von Rutte

Mark F Teasley

Andrew J Sitter

Beth E Dunlap

Melt-processible aromatic polyamides are obtained by reacting certain N,N'-isophthaloyl bis(lactam) compounds with certain aromatic diamines.

Melt-processible aromatic polyamide from N,N'-isophthaloyl bis lactam

Thermoprocessible aramid matrix polymer based composites have high flex and short beam shear strengths and low moisture uptake.

High performance aramid matrix composites

The formation of manganese-derivative scale in equipment involved in polyester manufacture is reduced by introduction of a sterically hindered benzoic acid in approximately stoichiometric amount. The acids include 2,6-dichloro-, 2,6-dimethyl- and 2,4,6-trimethylbenzoic acids. The scale is believed to be insoluble manganese terephthalate, presumably formed by reaction of manganese acetate catalyst generated as a result of a side reaction during the ester exchange reaction of dimethyl terephthalate with excess ethylene glycol. Preferably an alkali metal salt of an organic acid, such as sodium acetate or lithium acetate is also used to give a synergistic effect in combination with the hindered acid.

Preparation of polyesters

Conductive compositions useful in imparting antistatic properties in filaments and other articles are provided, which comprise N-alkyl polycarbonamides, polyesters or polyetheresters having a Tg (NMR) less than 25.degree. C and from 0.02 to 35 weight percent of a phosphonium salt of a phosphonate, phosphinate, or sulfonate.

Antistatic composition containing an aliphatic polyester or polyether

An antistatic synthetic polymer having a T.sub.g (NMR) of less than 25.degree. C., a log R.sub.s of less than 10 and containing phosphonium sulfonate groups can be used to improve the conductivity of synthetic fiber-forming polymers.

Growing community of inventors

Hockessin, DE, United States of America

Gurdial Singh