Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1997-09-22
1999-06-29
Gupta, Yogendra N.
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510212, 510202, 510203, 510213, 510505, 510506, 510500, C11D 0172, C11D 344
Patent
active
059168609
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a composition which can both strip coatings, for example paint based coatings, and clean objects which have been soiled by oils or greases.
The first stripping or cleaning compositions of the above type were based on methylene chloride and/or 1,1,1-trichloroethane (1.1.1.T) (see, for example, United States patent U.S. Pat. No. 2,507,983 and German patent DE-A-2 524 752).
Compositions of that type have the advantage of being highly effective and cheap. However, those compositions may cause environmental damage, more particularly to the ozone layer (Montreal protocol which terminates the use of 1.1.1.T, normally at the end of 1995).
Considerable advances were made by replacing chlorinated solvents by either lactames or lactones, usually N-methyl-2-pyrrolidone or gamma-butyrolactone (U.S. Pat. No. 4,120,810), or by a mixture of an alkyl diester of a dibasic acid which is an industrial by-product of the production of monomers required for the preparation of polyamides (DE-A-3 438 399).
The above compositions are not always suitable for stripping coatings of different natures such as water-based paints, oil-based paints, lacquers, varnishes and plastic resins. In particular, they are not effective for stripping coatings and for cleaning various objects to remove oils and greases.
The aim of the present invention is to provide a composition which is effective both for stripping and for cleaning.
A further aim of the invention is to provide a composition of the above type which in a variation, is free of solvents.
A still further aim is to provide a. composition of the above type which is stable for at least one year when stored.
These and other aims are achieved by the present invention which concerns a stripping and/or cleaning composition comprising, by volume: C.sub.4 -C.sub.6 aliphatic dibasic acid;
The composition of the invention thus contains at least 1% to 90% to 1% by volume, preferably 10% to 80%, of a C.sub.1 -C.sub.4 dialkyl ester of at least one C.sub.4 -C.sub.6 aliphatic dibasic acid.
The esters in the dibasic acid ester mixture are derived mainly from adipic, glutaric and succinic acids. In particular, the alkyl groups of the ester portion are selected from methyl and ethyl groups, but may also be propyl, isopropyl, butyl, n-butyl or isobutyl.
As indicated above, the C.sub.4 to C.sub.6 dibasic acids are by-products of the preparation of adipic acid which is a one of the principal monomers in polyamides, and the dialkyl esters are obtained by esterification of this by-product which generally contains 15% to 30% by weight of succinic acid, 50% to 75% of glutaric acid and 5% to 25% of adipic acid.
Dibasic acid esters are products which are commercially available. Particular examples of are Rhodiasolv RPDE.RTM. sold by Rhone-Poulenc and "Du Pont Dibasic Esterse.RTM." sold by Du Pont de Nemours.
The composition of the invention also contains 99% to 1% by volume, preferably 90% to 20% by weight, of at least one ether selected from ethers havinz:
Examples of ethers for use in compositions of the invention are:
The compositions of the invention may also contain at least one of the products below: solvent with a flash point of more than 40.degree. C., preferably more than 70.degree. C., such that the solvent is not classified as a flammable solvent.
Particular examples of solvents which are petroleum derivatives with a high flash point are mineral spirits such as petroleum spirit and naphthas.
Examples of commercially available products which can be used in compositions of the invention are Isopar.RTM. from Exxon, Soltrol.RTM. from Shell and HiSol.RTM. solvents from Ashland. It is recommended that 10 to 100 volumes, preferably 30 to 60 volumes, of c) is used per 100 volumes of a)+b).
Other possibilities are compounds with an aliphatic hydrocarbon chain which is saturated or contains at least one unsaturation, substituted by at least one alkyl, aryl or alkylaryl radical. More particularly, the aliphatic chain contains 3 to 12 carbon atoms, preferably 4 to 10 carbon atoms, thes
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Joye Jean-Luc
Vincent Marle-Madeleine
Gupta Yogendra N.
Rhone-Poulenc Chimie
Seugnet Jean-Louis
Solomon Andrew M.
Webb Gregory E.
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