Cold cleaning solvents
AssigneeElf Atochem North America, Inc.
InventorMichael S. Bolmer
Life of this patent
Estimating the term…
Abstract
Nonazeotropic solvent blends useful for cold cleaning applications in an open environment containing an HCFC, HFC or PFC component having no flash point (such as 141b), a higher boiling nonflammable chlorinated solvent (such as perchloroethylene), and a moderately flammable, intermediate boiling, oxygenated organic solvent (such as n-butanol).
Claims5
A nonazeotropic solvent blend useful for cold cleaning applications in an open environment consisting essentially of about 10-60 weight % of a halocarbon component selected from 1,1-dichloro-1-fluoroethane and 1,1,2,3,3-pentafluoropropane;
- about 1-30 weight % of a nonflammable chlorinated solvent component with a boiling point of about 80.degree.-130.degree. C. selected from the group consisting of perchloroethylene, trichloroethylene, and mixtures thereof;
- and from 10 to about 40 weight % of an oxygenated organic solvent component having at least 3 carbons, a flash point over 0.degree. C. and a boiling point intermediate that of the other two components, said components and their proportions being chosen such that (a) the blend has an average vapor pressure of about 2-7.6 psia and a substantially lower ozone depletion potential than 1,1,2-trichloro-1,2,2-trifluoroethane or 1,1,1-trichloroethane, and (b) when the blend is allowed to evaporate the resultant vapor fractions and liquid fractions each have no flash point.
A nonazeotropic solvent blend which consists essentially of about 50 weight % 1,1-difluoro-1-fluoroethane;
- about 25 weight % perchloroethylene;
- and about 25 weight % n-butanol.
Dependencies are inferred from the claim text.