Azeotrope-like compositions of 1,1,2-trichloro-1,2,2-trifluoroethane,1,2-dichloroethylene, and alkanol having 3 to 7 carbon atoms
AssigneeAllied-Signal Inc.
InventorsKane D. Cook, Chien C. Li, Rajat S. Basu, David P. Wilson
Life of this patent
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Abstract
Azeotrope-like compositions comprising 1,1,2-trichloro-1,2,2-trifluoroethane; 1,2-dichloroethylene; and alkanol having 3 to 7 carbon atoms have utility as degreasing agents and as solvents in a variety of industrial cleaning applications including cold cleaning and defluxing a printed circuit boards.
Claims12
Azeotrope-like compositions comprising from about 55 to about 70 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane;
- from about 30 to about 42 weight pe rcent trans-1,2-dichloroethylene;
- and from about 0.01 to about 3.0 weight percent 2-methyl-2-propanol which boil at about 44.5.degree. C at 760 mm Hg.
The azeotrope-like compositions of claim 3 consisting essentially of from about 58 to about 67 weight percent said 1,1,2-trichloro-1,2,2-trifluoroethane;
- from about 33 to about 41 weight percent said trans-1,2-dichloroethylene;
- and from about 0.01 to about 1.0 weight percent said 2-methyl-2-propanol.
Azeotrope-like compositions consisting essentially of from about 55 to about 70 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane;
- from about 30 to about 42 weight percent trans-1,2-dichloroethylene;
- and from about 0.01 to about 3.0 weight percent 3-pentanol which boil at about 45.1.degree. C. at 760 mm Hg.
The azeotrope-like compositions of cliam 8 consisting essentially of from about 58 to about 67 weight percent said 1,1,2-trichloro-1,2,2-trifluoroethane;
- from about 33 to about 41 weight percent said trans-1,2-dichloroethylene;
- and from about 0.01 to about 1.0 weight percent said 3-pentanol.
Stabilized azeotrope-like compositions consisting essentially of the azeotrope-like compositions of claim 8 and effective stabilizing amounts of a lower 1,2-epoxy alkane and at least one of a lower alkoxyphenol, phosphite ester, and lower cyclic alkene.
Stabilized azeotrope-like compositions comprising the azeotrope-like compositions of claim 10 and effective stabilizing amounts of a lower 1,2-epoxy alkane and at least one of a lower alkoxyphenol, phosphite ester, and lower cyclic alkene.
Dependencies are inferred from the claim text.