1,2-dichloroethylene compositions
AssigneePPG Industries Ohio, Inc.
InventorsMichael P. Dobrasko, Ronald D. Olinger
Life of this patent
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Abstract
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.
Claims23
A non-azeotropic solvent composition consisting essentially of trans 1,2-dichloroethylene and an effective stabilizing amount of each of:
- a. alkylene oxide having from 3 to 12 carbon atoms and a vicinal epoxy group,
- b. alcohol chosen from aliphatic and cycloaliphatic alcohols having from 2 to 8 carbon atoms, and
- c. material chosen from (i) lower alkoxyphenol, (ii) free radical stabilizer having at least one 2,2,6,6-tetra(lower alkyl)-1-piperidinyloxy-yl group or 2,2,5,5-tetra(lower alkyl)pyrrolidinyloxy group, or (iii) mixtures of (i) and (ii), wherein the trans 1,2-dichloroethylene is the primary solvent-providing halohydrocarbon of the solvent composition.
A composition consisting essentially of trans 1,2-dichloroethylene and an effective stabilizing amount of each of:
- a. butylene oxide,
- b. isopropyl alcohol, and
- c. a free radical stabilizer material having at least one 2,2,6,6-tetra(lower alkyl)-1-piperidinyloxy-yl free radical group.
A composition consisting essentially of trans 1,2-dichloroethylene and an effective stabilizing amount of each of:
- a. butylene oxide,
- b. isopropyl alcohol, and
- c. 4-methoxyphenol.
A liquid non-azeotropic halohydrocarbon vapor degreasing solvent composition comprising 1,2-dichloroethylene as the primary halohydrocarbon degreasing solvent and an effective stabilizing amount of each of:
- a. alkylene oxide having from 3 to 12 carbon atoms and a vicinal epoxy group,
- b. alcohol chosen from aliphatic and cycloaliphatic alcohols having from 2 to 8 carbon atoms, and
- c. material chosen from (i) lower alkoxyphenol, (ii) free radical stabilizer having at least one 2,2,6,6-tetra(lower alkyl)-1-piperidinyloxy-yl group or 2,2,5,5-tetra(lower alkyl)pyrrolidinyloxy group, or (iii) mixtures of (i) and (ii).
A composition consisting essentially of trans 1,2-dichloroethylene and an effective stabilizing amount of each of:
- a. alkylene oxide having from 3 to 12 carbon atoms and a vicinal epoxy group,
- b. isopropanol, and
- c. material chosen from (i) lower alkoxyphenol, (ii) free radical stabilizer having at least one 2,2,6,6-tetra(lower alkyl)-1-piperidinyloxy-yl group or 2,2,5,5-tetra(lower alkyl)pyrrolidinyloxy group, or (iii) mixtures of (i) and (ii).
A composition consisting essentially of trans 1,2-dichloroethylene and an effective stabilizing amount of each of:
- a. alkylene oxide having from 3 to 12 carbon atoms and a vicinal epoxy group,
- b. alcohol chosen from aliphatic and cycloaliphatic alcohols having from 2 to 8 carbon atoms, and
- c. material chosen from free radical stabilizer having at least one 2,2,6,6-tetra(methyl)-1-piperidinyloxy-yl group.
A composition consisting essentially of trans 1,2-dichloroethylene and an effective stabilizing amount of each of:
- a. alkylene oxide having from 3 to 12 carbon atoms and a vicinal epoxy group,
- b. alcohol chosen from aliphatic and cycloaliphatic alcohols having from 2 to 8 carbon atoms, and
- c. material chosen from free radical stabilizer having at least one 2,2,5,5-tetra(lower alkyl)pyrrolidinyloxy group.
A liquid halohydrocarbon vapor degreasing solvent composition comprising 1,2-dichloroethylene as the primary degreasing solvent and an effective stabilizing amount of each of:
- a. butylene oxide,
- b. isopropanol, and
- c. material chosen from (i) 4-methoxyphenol, (ii) free radical stabilizer having at least one 2,2,6,6-tetra(methyl)-4-hydroxy-1-piperidinyloxy, or (iii) mixtures of (i) and (ii),
- wherein the 1,2-dichloroethylene is principally trans-1,2-dichloroethylene.
Dependencies are inferred from the claim text.