# US 5,348,681 A · Composition based on 1,1,1,3,3-pentafluorobutane and methylene chloride, for the cleaning and/or drying of solid surfaces

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- Number: US 5,348,681 A
- Document ID: US5348681A
- Status: Granted
- Kind: A
- Application number: 08/087,099
- Filed: 1993-07-07
- Granted: 1994-09-20
- Earliest claimed: 1992-08-21
- Assignees: Elf Atochem S.A.
- Inventors: Daniel Desbiendras; Pascal Michaud
- Web page: https://patentgrep.com/patent/US5348681A

## CPC

- C07C 17/42: Use of additives, e.g. for stabilisation
- C07C 19/01: containing chlorine
- C07C 19/08: containing fluorine
- C11D 7/5018: {Halogenated solvents}
- C11D 7/5059: {Mixtures containing (hydro)chlorocarbons}
- C23G 5/02803: {containing fluorine}
- C07C: ACYCLIC OR CARBOCYCLIC 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

## Abstract

To replace cleaning compositions based on 1,1,2-trichloro-1,2,2-trifluoroethane (F113), the invention provides a composition comprising, by weight, 30 to 70% 1,1,1,3,3-pentafluorobutane (F365-mfc) and 70 to 30% methylene chloride. These two compounds form a positive azeotrope (B.p.=33.6.degree. C. at normal pressure). The composition, optionally stabilized, can be used for the cleaning and/or the drying of solid surfaces, in particular for removing flux from printed circuits and for degreasing mechanical components.

## Claims

### Claim 1

An azeotropic composition or a composition which has about the same composition in vapor phase as in liquid phase when employed at reflux, consisting essentially of, on a weight basis, from 30 to 70% 1,1,1,3,3-pentafluorobutane and from 70 to 30% methylene chloride and optionally an effective amount of at least one stabilizer, said composition boiling at about 33.6.degree. C. at normal atmospheric pressure.

### Claim 2 (depends on 1)

Composition according to claim 1, consisting essentially of, by weight, from about 50 to about 60% 1,1,1,3,3-pentafluorobutane and from about 40 to about 50% methylene chloride.

### Claim 3 (depends on 1)

Composition according to claim 1, wherein the stabilizing agent is a nitroalkane, an epoxide or a mixture of such compounds.

### Claim 4 (depends on 1)

Composition according to claim 1, wherein the proportion of stabilizing agent is from 0.01 to 5% with respect to the total weight of 1,1,1,3,3-pentafluorobutane and methylene chloride.

### Claim 5 (depends on 1)

Method for cleaning or drying a solid surface comprising applying an effective amount of a composition according to claim 1 to the solid surface.

### Claim 6 (depends on 1)

Method of removing flux from a printed circuit comprising applying an effective amount of a composition according to claim 1 to the printed circuit.

### Claim 7 (depends on 1)

Method of removing grease from a mechanical component comprising applying an effective amount of a composition according to claim 1 to the mechanical component.

### Claim 8

An azeotrope, consisting essentially of, on a weight basis, about 56.6% 1,1,1,3,3-pentafluorobutane and about 43.4% methylene chloride boiling at about 33.6.degree. C. at normal atmospheric pressure.