Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Liquid composition
Reexamination Certificate
1999-04-27
2001-08-14
Kopec, Mark (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Liquid composition
C252S364000
Reexamination Certificate
active
06274543
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to blends of halogenated materials useful as a cleaning and coating composition. More particularly, the invention relates to non-flammable cleaning compositions having silicone solvency and plastics compatibility.
BACKGROUND OF THE INVENTION
Chlorofluorocarbon compounds (CFCs) and hydrochlorofluorocarbon compounds (HCFCs) as a class possess unique chemical stability and solvent properties and have until only recently been used in a wide variety of applications. Among other applications, CFCs have found utility in drying processes, cleaning processes (e.g., the removal of flux residues from printed circuit boards), and vapor degreasing applications. Many CFCs, CFC-113 particularly, possess a valuable combination of solvency, non-flammability, and low toxicity, that make them ideally suited for many challenging solvent cleaning applications. But while these materials were initially believed to be environmentally benign, they now are linked to ozone depletion. According to the Montreal Protocol and its attendant amendments, production and use of CFCs must be discontinued (see, e.g. P. S. Zurer,
Looming Ban on Production of CFCs, Halons Spurs Switch to Substitutes
, CHEM. & ENG'G NEWS, Nov. 15, 1993, at 12).
Many performance characteristics are sought in CFC and HCFC replacements. Such replacements typically are required to possess low ozone depletion potential, low flammability, and low toxicity, and to have boiling point ranges that are suitable for a variety of solvent cleaning applications. Ideal replacement solvents also have the ability to dissolve both hydrocarbon-based and fluorocarbon-based soils.
There remain, however, solvent cleaning applications that require solvent characteristics not optimally possessed by any one replacement material. Among the most challenging solvent cleaning applications is the requirement of a solvent or solvent blend material that is non-flammable under conditions of cleaning and that exhibits a requisite solvency toward silicones and other difficulty-dissolved contaminant materials (e.g., hydraulic fluids and the like). These solvent compositions must also be compatible with (i.e., not act aggressively toward) protective coatings and plastic parts.
SUMMARY OF THE INVENTION
Briefly, in one aspect, the present invention provides a non-flammable composition comprising:
(a) a major amount of one or more highly fluorinated compound(s) having a boiling point less than about 100° C.;
(b) a minor amount of one or more fluorinated compound(s) containing at least one aromatic moiety and having a boiling point between about 100° C. and about 140° C.; and
(c) a minor amount of trans-1,2-dichloroethylene.
The present invention also includes methods of cleaning and coating using the above-described compositions. The compositions of the present invention provide non-flammable solvent blends capable of dissolving silicones, non-volatile hydraulic fluids, and other difficulty-dissolved contaminant materials, while exhibiting compatibility with plastics and protective coatings.
REFERENCES:
patent: 4999127 (1991-03-01), Merchant
patent: 5064559 (1991-11-01), Merchant et al.
patent: 5064560 (1991-11-01), Merchant
patent: 5196137 (1993-03-01), Merchant
patent: 5658962 (1997-08-01), Moore et al.
patent: 5756002 (1998-05-01), Chen et al.
patent: 5827446 (1998-10-01), Merchant et al.
patent: 6048471 (2000-04-01), Henry
patent: 0465037 (1992-01-01), None
patent: 0 465 037 A1 (1992-01-01), None
patent: 5-004003 (1993-01-01), None
patent: WO 96/13569 (1996-05-01), None
patent: WO 96/22356 (1996-07-01), None
patent: WO 96/36688 (1996-11-01), None
patent: WO 96/36689 (1996-11-01), None
patent: WO 98/37163 (1998-08-01), None
Anich Ann T.
Milbrath Dean S.
Owens John G.
3M Innovative Properties Company
Boyer Charles
Fagan Lisa M.
Kopec Mark
LandOfFree
Cleaning and coating composition and methods of using same does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cleaning and coating composition and methods of using same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cleaning and coating composition and methods of using same will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2462661