Ppg Industries Ohio, Inc.

Ppg Industries, Inc.

Ronald D Olinger

Earl M Gorton

Tommy G Taylor

Michael P Dobrasko

Michael B Guidry

Describes compositions of 1,2-dichloroethylene, particularly trans-1,2-dichloroethylene, stabilized with effective stabilizing amounts of a combination of (a) C3 to C12 alkylene oxide, e.g., butylene oxide, (b) alcohol chosen from aliphatic and cycloaliphatic alcohols having from 2 to 8 carbon atoms, e.g., isopropanol, and (c) a material chosen from (i) C1 to C5 alkoxyphenol, e.g., 4-methoxyphenol, (ii) free radical stabilizer having at least one 2,2,6,6-tetra(lower alkyl)-1-piperidinyloxy-yl group, and (iii) mixtures of (i) and (ii). Also describes use of such compositions for vapor degreasing of soiled articles, e.g., metal parts and soldered circuit boards.

1,2-dichloroethylene compositions

Polychloroethylene, e.g., trichioroethylene and perchloroethylene, is stabilized with a stabilizing amount of a stable free radical stabilizer, e.g., a material having the 2,2,6,6-tetra(lower alkyl)-1-piperidinyloxy-yl free radical group, such as 2,2,6,6-tetramethyl-4-hydroxy-1-piperidinyloxy, or the 2,2,5,5-tetra(lower alkyl)pyrrolidinyloxy group, such as 2,2,5,5-tetramethyl pyrrolidinyloxy. Stable free radical stabilizer is removed from a polychloroethylene composition containing same by contacting the composition with silica, e.g., precipitated silica.

Stabilized polychloroethylenes

Monovinyl acetylene and/or butadiene are/is removed from impure vinyl chloride by contacting the impure vinyl chloride and substantially anhydrous hydrogen chloride with a catalyst system in which Lewis Acid is carried on an alumina substrate. The preferred Lewis Acid is ferric chloride.

Reducing the monovinyl acetylene and/or butadiene content of impure

Describes a stabilized trans-1,2-dichloroethylene composition having a low concentration of aliphatic aldehyde hydrazone, optionally in combination with an epoxide. The aliphatic aldehyde hydrazone was found to be more efficient than commercially used hydroquinone monomethylether (HQMME) in preventing the isomeric transformation of trans-1,2-dichloroethylene to cis-1,2-dichloroethylene during storage. Also described is a process for cleaning the surface of an article with the stabilized 1,2-dichloroethylene composition.

Storage stabilized 1,2-dichloroethylene compositions

Describes nonflammable organic solvent compositions comprising 1,2-dichloroethylene and a halocarbon different than 1,2-dichloroethylene. The 1,2-dichloroethylene consists essentially of trans-1,2-dichloroethylene, cis-1,2-dichloroethylene and mixtures thereof; preferably a major amount of trans-1,2-dichloroethylene; and in particular at least 99% by weight of trans-1,2-dichloroethylene, based on the total weight of 1,2-dichloroethylene. The halocarbon is selected from the group consisting of 1,1,1,3,3,3-hexafluoroisopropanol, perfluoro-tert-butyl alcohol, 1,1,2,3,3-pentafluoropropane, 1-bromo-2-chloro-1,1,2-trifluoroethane, 1,2-dichloro-1,1,2,3,3,3-hexafluoropropane and mixtures thereof.

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Lake Charles, LA, United States of America

Ronald D Olinger