# US 5,705,463 A · Composition and process for removal of ionic salt deposits

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- Number: US 5,705,463 A
- Document ID: US5705463A
- Status: Granted
- Kind: A
- Application number: 08/021,797
- Filed: 1993-02-24
- Granted: 1998-01-06
- Earliest claimed: 1993-02-24
- Assignees: Tech Spray, Inc.
- Inventors: Greg Roland Unruh
- Web page: https://patentgrep.com/patent/US5705463A

## CPC

- C11D 7/262: {fatty or with at least 8 carbon atoms in the alkyl or alkenyl chain}
- C11D 7/261: {Alcohols; Phenols}
- C11D 7/5004: {Organic solvents}
- C23G 5/02: using organic solvents
- H05K 3/26: Cleaning or polishing of the conductive pattern
- C11D 7/24: Hydrocarbons
- C11D 7/267: {Heterocyclic compounds}
- C11D 7/28: containing halogen
- C11D 7/32: containing nitrogen
- C11D 7/34: containing sulfur
- H05K 2201/0761: Insulation resistance, e.g. of the surface of the PCB between the conductors
- H05K 2203/121: Metallo-organic compounds
- C11D: DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C23G: CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

A composition and method for the removal of ionic salt deposits from a surface using an organic solvent of low polarity and a complexing agent. The complexing agent is chosen from a group which includes podands, cryptands, and coronands. The method provides nearly complete removal of ionic salt deposits with a single washing of the surface with the low polar cleaning mixture.

## Claims

### Claim 1

A composition for removing ionic salt deposits from a surface which comprises:
(a) an organic solvent selected from a group consisting of alkyl halides, paraffinic monohydric alcohols, non-halogenated paraffins, aromatics and mixtures thereof;
(b) a complexing agent in a concentration of between about 0.001 weight percent and about 0.1 weight percent of the composition, wherein the complexing agent is a crown ether consisting of a monocyclic oligoether ligand exclusively containing oxygen as donor atoms and having non coordinated donor atoms so that the complexing agent can solvate ionic residue comprising a salt of an alkali metal or an alkaline earth metal by forming a guest/host relationship with the ionic residue; and
(c) a stabilizing amount of a nitroparaffin in said solvent.

### Claim 2 (depends on 1)

The composition of claim 1, wherein the organic solvent is selected from a group consisting of alkyl halides having between 1 and 3 carbon atoms; paraffinic monohydric alcohols having between 1 and 3 carbon atoms; linear or branched non-halogenated paraffins having 5 to 30 carbon atoms; aromatics having 6 to 9 carbon atoms in a ring; and mixtures thereof.

### Claim 3 (depends on 1)

The composition of claim 1, wherein the organic solvent is an organic solvent selected from a group consisting of Trichloromonoflouromethane; 1,1,2-Trichloro-1,2,2-trifluoroethane; 1,1-Dichloro-2,2,3,3,3-pentafluoropropane; 1,1-Chloro-1-fluoroethane; 1,1,1,2-Tetrafluoroethane; 2,2-Dichloro-1,1,1-trifluoroethane; Ethyl Alcohol; Isopropyl Alcohol; Methyl Alcohol; a blend of 1,1,2-Trichloro-1,2,2-trifluoroethane and Methylene Chloride; a blend of 1,1,2-Trichloro-1,2,2-trifluoroethane, Isopropanol, and Nitromethane; a blend of 1,1,2-Trichloro-1,2,2-trifluoroethane, Ethanol, and Nitromethane; a blend of 1,1,2-Trichloro-1,2,2-trifluoroethane, Methanol, and Nitromethane; Xylene; Toluene; and ISOPAR.TM. solvents.

### Claim 4 (depends on 1)

The composition of claim 1, wherein the crown ether is in a concentration between about 0.005 weight percent and about 0.02 weight percent of the composition.

### Claim 5 (depends on 2)

The composition of claim 2, wherein the crown ether is in a concentration between about 0.005 weight percent and about 0.02 weight percent of the composition.

### Claim 6 (depends on 3)

The composition of claim 3, wherein the crown ether is in a concentration between about 0.005 weight percent and about 0.02 weight percent of the composition.