Elf Atochem S.a.

Atofina

Societe Atochem

Aerospatiale Societe Nationale Industrielle

Atofina Chemicals, Inc.

Pascal Michaud

Jean-Jacques Martin

Daniel Desbiendras

Andre Lantz

Stephane Fouquay

Michael S Bolmer

Pierre Lascours

Martine Bil

Jean-Charles Boussaguet

Jean-Claude Lheureux

Yves Henry

Bruno Costes

The invention relates to a method of cleaning a solid surface comprising the following stages: a) the solid surface is cleaned using a microemulsion-type cleaning composition; e) the cleaned surface is drained; f) the drained surface is rinsed with an organic solvent or a mixture of organic solvents with a low boiling point; and g) said surface which was rinsed with the organic solvent or the mixture of organic solvents used in c) is then dried.

Method of cleaning a solid surface by removing organic and/or mineral soils using a microemulsion

To replace compositions based on CFCs or CFHCs in applications for cleaning or drying solid surfaces (in particular defluxing), the invention proposes azeotropic or quasi-azeotropic compositions based on 1,1,1,2,3,4,4,5,5,5-decafluoropentane, 1,1,1,3,3-pentafluorobutane and, optionally, methanol.

Cleaning or drying compositions based on 1,1,1,2,3,4,4,5,5,5-decafluoropentane

A drying composition according to the invention is composed of a solution of a surface-active agent in a mixture of a fluorinated hydrocarbon and of a polyfluorinated alcohol of formula:Rf&#x2014;(CH)&#x2014;OH&#x2003;&#x2003;(I)in which n is equal to 1 or 2 and Rf represents a linear perfluoroalkyl radical containing from 2 to 8 carbon atoms.

Compositions for drying solid surfaces

Water-repellent composition

In order to replace 1,1,2-trichloro-1,2,2-trifluoroethane and 1,1-dichloro-1-fluoroethane in compositions for treating solid surfaces (in particular defluxing), the invention proposes the use of a quasi-azeotropic mixture containing, by weight, from 75 to 95% of 1,1,1,3,3-pentafluorobutane, from 1 to 15% of methylene chloride and from 1 to 10% of methanol.

Quasi-azeotropic mixture based on 1,1,1,3,3-pentafluorobutane, methylene chloride and methanol for the treatment of solid surfaces

Azeotropic and azeotrope-like compositions of 142/365 mfc, 142/methanol, and 142/365 mfc/methanol are provided, as are methods for using the same for cleaning, drying, foam blowing and the like.

Compositions based on 142

In order to replace compositions based on CFC or on HCFC in cleaning or drying applications on solid surfaces (in particular defluxing), the invention provides azeotropic or near-azeotropic compositions based on 1,1,1,3,3-pentafluorobutane, on dichloromethane, on methanol and on 1,1,1,2,3,4,4,5,5,5-decafluoropentane.

Cleaning or drying compositions based on F36mfc, CHzCLz, CH3OH and 43-10mee

Compns. based on azeotropic or quasi-azeotropic mixts. of trichloroethylene and 1,1,1,2,3,4,4,5,5,5-decafluoropentane are useful for replacing CFC or HCFC in cleaning and degreasing of surfaces (e.g., defluxing of printed circuits) and drying of surfaces. The ability of these compns. to dry surfaces is improved by addn. of RCONR(CH2)nNHCOR surfactants (R&equals;C14-22 alkyl, n&equals;1-5).

Cleaning or drying compositions based on 43-10mee and on trichloroethylene

In order to replace compositions based on CFC or on HCFC in cleaning or drying applications on solid surfaces (in particular defluxing), the invention provides azeotropic or near-azeotropic compositions based on 1,1,1,2,3,4,4,5,5,5-decafluoropentane, on dichloromethane, on cyclopentane and on methanol.

Cleaning or drying compositions based on 43-10mee, on CH2C12, on cyclopentane and on CH3OH

Cold cleaning composition based on alkanes or cycloalkanes and an

The invention relates to a water repellent composition (&lt;&lt;Rain Repellent&gt;&gt;), comprising a hydrophobic agent and a solvent compatible with the hydrophobic active agent, characterized in that the solvent comprises at least one fluorinated hydrocarbon, liquid at ambient temperature, and in that the active hydrophobic agent is a compound of organopolysiloxane type. The invention also relates to a disposable pressurized container containing the above composition and an inert gas. The invention finds application in particular in the removal of water from a surface especially the windscreen of vehicles or aircraft.

Water repellent composition

In order to replace compositions based on CFC or on HCFC in applications for cleaning or drying solid surfaces (in particular defluxing), the invention proposes azeotropic or virtually azeotropic compositions based on 1,1,1,2,3,4,4,5,5,5-decafluoropentane, methylene chloride and optionally methanol.

Cleaning or drying compositions based on

Cleaning agent based on cycloalkanes

The invention relates to a composition based on stabilized methylene chloride composed essentially of at least one 1,2-epoxyalkane and of at least one acetal, and preferably no nitroalkane. The composition according to the invention can be used for degreasing, cleaning and/or drying metal components.

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Saint-Gratien, France

Pascal Michaud