Solvent compositions containing chlorofluoroolefins

Abstract

Compositions and methods based on the use of fluoroalkene containing from 3 to 4 carbon atoms and at least one carbon-carbon double bond, such as 1,2,-dichloro-3,3,3-trifluoropropene (HFO-1223xd) having properties highly beneficial in solvent cleaning applications.

Description

FIELD OF THE INVENTION [0001] This invention relates to compositions and systems having utility in numerous situations, including particular solvent cleaning systems, as well as refrigerant lubricants and / or compatibilizing agents, and to methods which utilize such compositions and systems. More particularly, the present invention in preferred aspects is directed to solvents, blowing agents, heat transfer fluids and compatibilizing agents comprising multi-fluorinated olefins. BACKGROUND OF THE INVENTION [0002] Solvent compositions are in widespread use throughout the world and in a wide variety of industrial applications. Certain fluorocarbons have been preferred components in solvent cleaning systems for many years. Trichlorotrifluoroethane has been one of the most widely used fluorocarbon solvents in recent years because it is generally effective as a solvent for many greases, oils, waxes and the like, and has therefore found widespread use for cleaning electric motors, compressor...

AI Technical Summary

Benefits of technology

[0010] Applicants have found that the above-noted and other needs can be satisfied, and many of the above-not

Problems solved by technology

Concern has increased in recent years about potential damage to the earth's ozone layer, and certain chlorine-based compounds have been identified as particularly problematic in this regard.

The thus generated chlorine radicals combine with ozone, resulting in ozone depletion.

Accordingly, the use of organic chlorine-based compounds such as CFCs has been severely restricted in many countries of the world by governmental regulation.

However, while many of the hydrochlorofluorocarbons described heretofore may have substantial solvent power with respect to certain oils and fats, many also have certain disadvantages.

For example, some of these compounds may tend to attack substrates, particularly general-purpose plastics such as acrylic resins and ABS resins.

Furthermore, the higher olefinic compounds described in Smutny may also be undesirable in certain applications because of the potential level of toxicity of such compounds which may arise as a result of their activity as pesticides.

Also, such compounds may not be sufficiently volatile to act as effective solvents in certain vapor degreasing operations, and the relatively low vapor pressure of such compounds may make it difficult to remove the solvent composition from the parts being cleaned.

Unfortunately, many HFC's which might otherwise be desirable for use in solvent compositions are not nonflammable.

For example, the fluoroalkane pentafluorobutane (HFC-365) is flammable and therefore not viable for use in many applications.

Furthermore, this problem is worsened because metal, which is typically present during any solvent cleaning operations, acts as a catalyst and causes the hydrolysis of CFC-113 to increase dramatically.

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