Strategic Technologies

 

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Halogenated Solvents

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To view the entire patent, please click the patent number for the U.S. Patent Office site.  For information on licensing a technology please contact the NISTAC  representative listed below.

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U.S. Patents:

Chemical solvent compositions for various cleaning applications.

TADAC Reference Number:  T03-04

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This patent bundle consists of chemical solvent compositions for various cleaning applications including general solvent cleaning, vapor degreasing, cold cleaning, electronics cleaning and dewatering.  These solvents provide stable, effective alternatives to chlorofluorocarbons and other harmful chemicals.  The patents can be separated into the following five categories:  n-bromopropane azeotropes and blends, HCFC-225 azeotropes and azetrope-like blends, new hydrofluorocarbon structures, fluorinated surfactants, and a vapor degreasing apparatus.

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Applications:

-Blowing agents
-De-fluxing and cold cleaning of printed circuit boards
-Dry cleaning
-Engine and system cleaning
-Hard surface cleaning
-Imparting soil repellency to fabrics
-Industrial use where solvents must be non-flammable and chemically inert
-Oxygen system cleaning
-Particle removal from parts and components
-Refrigeration and flushing
-Removal of water or aqueous films from the surface of substrates
-Removal of water where hot air drying is too expensive or time consuming
-Stain and contaminant removal
-Ultrasound cleaning of complex metal parts, electronic components, implantable prosthetic devices and optical equipment
-Vapor degreasing

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Advantages:

The bromopropane, HCFC-225 and HFC structures offer constant composition during boiling, they dry cleanly, leave no residue, are non-flammable, and have low toxicity and low ozone depletion potential.  Other benefits include:

-Reduced global warning potential
-Azeotrope-like compositions remain liquid at room temperature.

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U.S. Patents:

To view the entire patent, please click the patent number linking you to the U.S. Patent Office website.  For information on leasing please contact the individual listed below.

n-Bromopropane Azeotropes and Blends

6,365,565  Compositions of 1-bromopropane and an organic solvent
6,103,684  Compositions of 1-bromopropane and an organic solvent
6,048,832  Compositions of 1-bromopropane, 4-methoxy-1,1,1,2,2,3,3,4,4-nonafluorobutane and an organic solvent
6,010,997  Compositions of 1-bromopropane, nitromethane or acetonitrile and an alcohol

HCFC-225 Azeotropes and Azeotrope-Like Blends

5,288,819  Azeotrope-like compositions of dichloropentafluoropropane and 1,2-dichloroethylene
5,118,438  Azeotrope-like compositions of dichloropentafluoropropane and a hydrocarbon holding six carbon atoms
5,118,437  Azeotrope-like compositions of dichloropentafluoropropane, ethanol and a hydrocarbon containing six carbon atoms
5,116,526  Azeotrope-like compositions of dichloropentafluoropropane and 1,2-dichloroethylene
5,106,526  Azeotrope-like compositions of dichloropentafluoropropane, methanol and a hydrocarbon containing six carbon atoms
5,104,565  Azeotrope-like compositions of dichloropentafluoropropane 2-propanol and a hydrocarbon containing six carbon atoms

New HFC (hydrofluorocarbon) Structures

5,696,307  Hydrofluoroalkanes as cleaning and degreasing solvents
5,352,375  Azeotrope-like compositions of 1,1,1,2,2,3,3-heptafluoropentane, C.sub.1-C.sub.3 alkanol and optionally nitromethane
5,298,083  Method of dissolving contaminants from substrates by using hydrofluorocarbon solvents having a portion which is fluorocarbon and the remaining portion is hydrocarbon
5,275,669  Method of dissolving contaminants from substrates by using hydrofluorocarbon solvents having a portion which is fluorocarbon and the remaining portion is hydrocarbon
5,273,592  Method of cleaning using partially fluorinated ethers having a tertiary structure 
5,254,755  Partially fluorinated alkanols having a tertiary structure
5,118,360  Method of cleaning using partially fluorinated alkenes having a tertiary structure as solvent
5,087,777  Partially fluorinated alkenes having a tertiary structure
5,059,728  Partially fluorinated alkanes having a tertiary structure

Fluorinated Surfactants

5,610,128  Surfactants and drying and dry cleaning compositions which utilize said surfactants
5,856,286  Surfactants for use in drying and dry cleaning compositions
5,868,799  Surfactants and drying and dry cleaning compositions which utilize said surfactants

Other Technology

5,264,044  Method of cleaning using hydrochlorofluorocarbons having a tertiary structure
5,256,329  1,1-dichloro-1-cluoroethane dewatering systems
5,075,982  Open top defluxer with improved solvent vapor recovery

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For NISTAC Technology Licensing 
Discussions Contact:
Bob Reader
Direct:  (785) 532-3903
or (785) 532-3900