Pennwalt Corporation

Daniel Ashton Dimmig

Richard A Ferren

John C Grigger

A process for preparing an aqueous concentrated latex of a copolymer or terpolymer of ethylene and a C.sub.2 -C.sub.3 -perfluorocarbon by creaming a latex of 25-30% copolymer solids and recovering a concentrated latex having 1.5-2.5 times the concentration of the starting latex. The concentrated latex can be used to prepare crack-free or void-free coatings on substrates.

Concentrated aqueous latex of ethylene/C.sub.2 -C.sub.3 -perfluorocarbon

An improvement in the process for preparing mercaptans wherein an ethylenically unsaturated organic compound is reacted with hydrogen sulfide that is present in molar excess, catalyzed by UV light, with recovery of the desired mercaptan from the reaction mixture. The improvement being the carrying out of the reaction in the presence of an effective amount of selected class of acetophenone reaction promoters. The improved process results in much faster reaction rates.

Process for preparing mercaptans

Linear polyamide-imides having recurring units of the formula ##STR1## in which A is an aromatic radical;

Process for preparation of linear polyamide-imides from aromatic

Copolymers of ethylene and hexafluoropropene (HFP) containing between about 15 mol percent and 50 mol percent HFP comprising low to intermediate molecular weight oils of high viscosity. The copolymers are prepared in the presence of a free radical initiator at autogenous pressure at a temperature ranging from 20.degree. C. to 80.degree. C.

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King of Prussia, PA, United States of America

Daniel Ashton Dimmig