SE443369B - COMPOSITION INCLUDING A DISPOSAL OF A FLUORAL COOLESTER AND ITS USE FOR TREATING THE SURFACE OF A RECORDING MEDIUM - Google Patents

Description

30 _j0 w 7808515-1 0 2 the meaning and amplitude of the sound vibrations. The pick-up comprises a needle, which is usually in the form of a diamond or a sapphire, which usually has a hemispherical or ellipsoidal tip, which rests on or penetrates into the gramophone track and is moved in relation to variations of the pattern in said track. . The needle, in turn, is usually mounted on an arm which moves along with the needle to induce variations in an electric or magnetic field relative to the movement of the needle. This generates an electrical signal representative of the track configuration, which signal can then be amplified and used to drive speakers. Again, the needle is caused to vibrate mechanically in relation to the variations in amplitude and frequency of the waveforms of the track wall, which comprise the recorded signal. A needle must follow a plurality of equally spaced track contours with recorded signals of the order of 15-20 Hz and 20,000 Hz.

With the introduction of four-channel recording systems or quadrophonis systems, a needle must carefully follow tracks with recorded signals to cause vibrations of up to 50,000 Hz. As the needle rests in the gramophone record groove, the relatively hard needle wears away the relatively soft thermoplastic material in the gramophone record, which forms the groove. To date, there has been no simple solution to the problem of abrasion caused by the needle resting in the groove contour of such discs.

The deterioration of the sound quality of gramophone records with an increase in the number of plays due to abrasion of their tracks through repeated uses results in the records becoming unusable and often thrown away within a short period of time. A number of factors are responsible for abrasion, including the general abrasion caused by abrasive mechanisms and adhesion abrasion mechanisms to an extent proportional to the load on the needle. This load is not only the load on the disc resulting from the dead weight of the needle, which load can amount to about 1-4 g, but also includes dynamic inertial forces caused by the needle mass and the frequency of changes in the direction of the needle as the needle follows the groove. As is known, a reduction in the dead weight load and the needle mass results in a reduction in the degree of groove wear, but wear and the consequent deterioration of the reproducibility can not be completely eliminated. In any case, most prior art experiments using gramophone record cleaner or alleged lubricants have simply resulted in only a cleaning or deposition of chemical films on the discs without any success as these materials generally reduce reproducibility due to rapid wear. the groove is cleaned, or hydrodynamic damping of the movement of the needle in the groove if oily materials have precipitated. Furthermore, when using these materials, it is often observed that the noise level increases depending mainly on dust which has been trapped along with the formation of a sticky coating on the needle.

However, it has been observed that attempts to use powdered, solid lubricants such as graphite, molybdenum sulfide and the like have several disadvantages, as they do not reduce the reproducibility but also increase the noise level due to the interference of the particles in the grooves in the disc.

In general, various silicones and hydrocarbon waxes and certain fluorinated telomeric compositions have been used as lubricants in certain applications. An example of this is an ethylene which has been telomerized with trichlorotrifluoroethane to give products of moderate molecular weights. To obtain a wax-like product, a second, active telogen must be incorporated into the telomerization process. Generally, such active telogens are hydrogen-containing compounds including tertiary hydrocarbons, aliphatic alcohols, dihydric sulfur compounds, aliphatic, tertiary amines, aliphatic ethers, carbonyl compounds and dialkyl phosphites. Since these active telogens contain hydrogen, the telomer products contain significant amounts of hydrogen, for example 0.05-2% by weight.

Another example taken from the prior art are compositions which do not contain any hydrogen and which have a lower melting point. In fact, these compositions are derived from the products obtained by telomerizing the tetrafluoroethylene with certain halogenated alkanes. The compositions were prepared by chlorination or fluorination of certain fractions of telomeric iodide mixtures, the iodine being replaced by chlorine or fluorine. These compositions are used as a general, dry lubricant, in the protective treatment of surfaces, as oil and water repellents, and as a mold release composition and a composition which is to avoid adhesion.

A method is known in the art for renewing, surface-treating and protecting a gramophone record by coating it with a composition consisting mainly of acrylic polymer, polyethylene emulsion, a detergent, an ether and water, whereby the composition is brushed into the grooves, any excess is removed, and the gramophone record is dried and played.

A method, composition and article for improving the lubrication, abrasion resistance and reducing the coefficient of friction of substrates, such as photographic films, magnetic surfaces and other recording elements, by applying a solution comprising tetrafluoroethylene telomere to the substrates are also previously known in the art. and a copolymer of vinyl chloride and the trifluorochlorethylene in a volatile solvent, drying and removing the excess, and previously such lubricant-treated substrates have also been described in the art. In fact, it was found that the combination of a lubricant, namely tetrafluoroethylene telomere and a non-lubricant, namely poly (trifluorochlorethylene-vinyl chloride) produces a coefficient of friction which is less than the coefficient of friction of the lubricant itself.

The composition of the present invention, which provides an opening-resistant, lubricating coating for gramophone records and the like, is a solution comprising mainly an ester lubricant, and optionally a tetrafluoroethylene telomer or an antistatic agent, and a volatile solvent therefor.

The compositions can be easily applied to any number of thermoplastic substrates commonly used in the gramophone trade, on which signals are recorded in the form of waveforms or grooves, to obtain a smooth coating which promotes a significant increase in its lubrication properties.

In accordance with the present invention, there is provided a composition capable of providing various substrates, including a gramophone record, a low coefficient of friction, the composition comprising essentially from about 0.001 to about 3,000% by weight of a mixture of solutes consisting of a carboxylate ester, wherein said ester is derived from fluoroalkanol and an aliphatic carboxylic acid having between 3 and 30 carbon atoms and an antistatic agent comprising amines, fatty quaternary ammonium compounds, fatty acid esters, phosphate esters and ethoxylated compounds, and between 97,000 and 99.999% by weight of a volatile solvent therefore .

The esters in the form of esters according to the preferred embodiment to be described below are soluble in the solvent and are mostly not present in the composition as particles or as colloidal suspensions. In fact, the composition of the present invention is usually a substantially homogeneous solution, i.e. it shows a uniform composition throughout its volume.

The term "substrate" as used herein includes various surfaces of articles to be treated with the compositions and relates to plastic substrates, metal substrates, combinations of plastic and metal substrates, and in particular recording playback elements of synthetic, natural thermoplastic materials and combinations thereof including resins, shellac, polyvinyl esters such as polyvinyl acetate, polyvinylbenzene, polyvinyl chloride, cellulose acetate, polymethyl methacrylate, cellulose butyrate, cellulose nitrate, their derivatives and copolymers and mixtures thereof. In particular, the term "substrate" includes surfaces made from different compositions generally formed by various types of press molding techniques into gramophone records, as well as similar thermoplastic elements having track contours which, when used in conjunction with certain dynamic elements, such as needles, are capable of following said contours and reproducing recorded mono, stereo and video signals therefrom.

The compositions of the present invention, which give a certain substrate a low coefficient of friction, comprise a solution of a carboxylate ester lubricant comprising esters in which the alcohol moiety is derived from fluorination of an aliphatic alcohol. In general, the fluoroalkyl esters may be esters of monocarboxylic acids, namely fluoroalkyl monoesters; the esters of dicarboxylic acids, namely fluoroalkyl diesters; esters of tricarboxylic acids, namely fluoroalkyl triesters, and esters of fluoroalkyl triesters; According to the invention, the fluoroalkyl esters are compounds which are derived from carboxylic acids by replacing the ionizable hydrogen atom with a fluoroalkyl radical.

The fluoroalkyl moiety of the molecule is its alcohol moiety and usually has from about 2 to about 20 carbon atoms. The preferred fluoroalkyl monocarboxylic acid esters are fluoroalkyl acetate, fluoroalkyl laurate and fluoroalkyl stearate; the preferred fluoroalkyldicarboxylic acid esters are fluoroalkyl malonate and fluoroalkyl azelate; and the preferred fluoroalkyl tricarboxylic acid ester is fluoroalkyl citrate. These fluoroalkyl esters can be prepared without difficulty by conventional chemical techniques known in the art.

In general, the fluoroalkyl monoesters can be prepared by condensation of fluoroalcohols with aliphatic monocarboxylic acids. Furthermore, the fluoroalkyl polyesters can also be readily prepared by reacting fluoroalcohols with polycarboxylic acids, either of the aliphatic or aromatic type.

Mixture esters can also be readily prepared by reacting fluoroalcohols with polycarboxylic acids, either of the aliphatic or aromatic type.

Mixture esters can also be readily prepared such as those formed from the condensation products of pyromelic anhydride with a mixture of fluoroalcohols.

The esters described herein comprise those esters of terminally fluorinated alcohols in which a bridge containing an alcohol group is interposed between the fully fluorinated moiety and the ester bond.

It will be appreciated that the fluorinated alcohol may be branched as well as straight-chain.

In particular, the fluoroalkyl esters according to the invention can be easily prepared from perfluoroalkylaliphatic alcohols (namely 2-perfluoroalkylalkanols) of the formula CnF2n + 1 (CH2) mÛH, where n is from about 3 to 14 and m is 1-3 and the corresponding carboxylic acid by methods known in the art. For example, esterification reactions can be easily carried out using p-toluenesulfonic acid or sulfuric acid as a catalyst with the alcohol and carboxylic acid in benzene and heating these constituents, removing the reaction water by co-distillation with the benzene and then removing any residue by distillation. the esters in question. The perfluoroalkylethanols can be prepared by hydrolysis of fluoroalkylhydrogen sulphate, which in turn was prepared from the reactions between perfluoroalkylethyl iodides with rich sulfuric acid. The perfluoroalkylethyl iodides can be further prepared by known reactions between perfluoroalkyl iodide and ethylene as well as by known telomerization reactions. Conventional separation techniques can be used to isolate selected fractions, and for example, corresponding iodides, whose perfluoroalkyl moiety has 6-14 carbon atoms, can be separated by distillation.

The fluoroalkyl esters can generally be mixtures which, if desired, can be further refined or purified by fractional distillation or by chromatographic techniques. Nevertheless, the esters may comprise a somewhat wide range. For example, a common fluoroalkyl ester, such as fluoroalkyl malonate, may generally be a mixture of esters having on average about 70.80% perfluorohexyl to perfluorheptyl containing esters, and esters having a perfluorobutyl moiety and lower, in a content of less than about 5% and a perfluorodecyl moiety and higher, which constitutes the rest.

The carboxylic acids intended for the invention, which form the acid moiety in the esters, may contain from about 3 to 30 carbon atoms.

The carboxylic acid portion of the ester is aliphatic, and may be saturated or may contain unsaturation due to the presence of double bonds, such as ethylenic unsaturation. Representative carboxylic acids of the invention are the fatty acid esters, both saturated and unsaturated, and include acetic acid, malonic acid, butyric acid, isovaleric acid, azelaic acid, caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, olamic acid, palmalic acid, , linolenic acid, eleo-stearic acid, likanoic acid, pararic acid, arachinic acid, gadoleic acid, arachidonic acid, behenic acid, ketolic acid, erucic acid, lignoceric acid, selacolic acid and cerotic acid, lauric acid, malonic acid, azelaic acid, stearic acid and stearic acid .

Certain telomers of low molecular weight fluorocarbons, and in particular telomeres of tetrafluoroethylene, can be readily incorporated into the compositions of the invention. As used herein, the term "telomeres" includes homotelomers and co-lomers, and the term "telomerization" includes homotelomerization and co-lomeromerization, and the term "low molecular weight telomeres" refers to telomeres having a maximum average molecular weight of about 3700. A group of preferred telomeres according to the invention can be represented by the general structural formula: R- (CF 2 CF 2) aX (I) wherein R is a haloalkyl containing 1-4 carbon atoms, X is chlorine, iodine or fluorine and a is an integer of from about 6 to about 16. A preferred composition according to the invention is one in which X is chlorine or fluorine and the radical is a group of the structural formula R 11 R 2 - f - F where R 1 and R 2 each independently represent perfluodalkyl and monochloro-perfluoroalkyl, where each alkyl group has 1-4 carbon atoms. This tetrafluoroethylene telomer has been commercially available under the trade name "MP-51". In general, these telomeres are completely halogenated telomeres because they do not contain hydrogen, and have a molecular weight of from about 800 to about 1800.

Other groups of closely related and preferred telomeres are those having the formula: R '(CF2-CF2) b Y (II) - wherein R' is a hydrogen-containing part of a telogen, the telogen comprising tertiary hydrocarbons, aliphatic alcohols, dihydric sulfur compounds, aliphatic, tertiary amines, aliphatic ethers, aliphatic carbonyl compounds, dialkylamides and dialkyl phosphites, and Y is chlorine or a chlorofluoroalkyl, where the alkyl moiety has 1-2 carbon atoms and where b is an integer of from about 3 to about 50. In general, these tetrafluoroethylene atoms contain , in contrast to the above telomeres, hydrogen, for example in a content of 0.05-2% by weight.

Hydrogen-containing tetrafluoroethylene telomeres are available under the trademark "Vydax AR".

These telomeres have a maximum average molecular weight of about 3700, a specific gravity of about 2.16, a melting point of 300 ° C, and are usually marketed in various concentrations comprising a suspension having a solids content of 20% in trichlorodrifluoroethane.

It has been found possible to separate from "Vydax AR" a fraction having a slightly lower molecular weight, by means of such conventional procedures as extraction, decantation, filtration, or centrifugation. By means of these methods a selected fraction is obtained, wherein, in the above-mentioned structural formula II, b has a value of from about 3 to about 8. In general, the absence of turbidity in the solution or the fact that it is clear proves to be a good indication on such a selected fraction. The average molecular weight of this lower fraction is between about 400 and 900, the fraction being readily soluble in the organic solvents described herein. The melting point of this fraction is usually less than 120 ° C.

In the case of hydrogen-containing telomeres, such as "Vydax AR", it has been found, in the case of certain preferred embodiments, that the use of the lower molecular weight fraction, i.e. the fraction, which has a molecular weight of less than about 900, results in favorable properties for certain end uses described herein. While a needle following the tracks of a stereotype or quadrophonium type gramophone record, when the record is coated with a composition of the invention, is observed thus no significant build-up of abrasive particles on the needle, compared to an untreated gramophone record. Furthermore, no real clogging of the tracks or any interference with them occurs even in a single change with a gramophone record at frequencies up to and including 45,000 Hz, which can occupy no more than about 0.02 mm along the track in the gramophone record.

In general, the concentration of the above-mentioned telomer additive can vary within a relatively wide range, but a range of from about 2.0% by weight to about 0.00l% by weight of the total weight of the composition has been found to be most effective. In practice, a concentration of between about 0.15% by weight and about 0.005% by weight has proven satisfactory for the treatment of gramophone records.

An antistatic agent is not always required in the compositions of the invention. It has been noted that certain ester type lubricants do indeed have the property of effectively reducing static charge on a substrate without the incorporation of a particular antistatic agent as such, "However, an antistatic agent may be used, if desired, to make the compositions of the invention more effective. from a practical point of view in that these compositions, incorporating said means, eliminate or substantially reduce the electrostatic charge on the surface of the gramophone records on which these compositions are applied, thereby attracting the forces which induce the migration of dust and other undesirable foreign particles to the gramophone record disc.

The electrostatic charge can have many causes, but is especially noted when a gramophone record is removed from its protective case, when its surface is polished with a cloth or brush, and when the surface of the gramophone record is polished. Representative of a group of preferred antistatic agents which have been found to be highly effective in the compositions of the invention are the tertiary amines including the dialkanolamines.

These amines have been found to be compatible in solubility with the solvents described herein. The particular dialkanolamines which have been found to be highly suitable for the compositions of the invention may be represented by the following general structural formula: HOCHZCHZT CHZCHZOH I _, 'RW _ g where R "is an alkyl group having from about 4 to about 20 carbon atoms. dialkanolamines have a molecular weight of from about 150 to about 400. Illustrative of LH 9 7808513-1 such dialkanolamines are N, N-bis (2-hydroxyethyl) dodecylamine, N, N-bis (2-hydroxyethyl) tetradecylamine and N, N-bis (2-hydroxyethyl) tetradecylamine The dialkanolamines can be readily prepared by conventional chemical techniques known in the art Other suitable and preferred antistatic agents can be readily incorporated, if desired, into the compositions of the invention. Thus, other antistatic agents include fatty, quaternary ammonium compounds, fatty acid esters, phosphate esters and the ethoxylated compound. The ethoxylated compounds include such compounds. such as polyethylene glycols and ethoxylated triglycerides, ethoxylated sorbitol and the like. The concentration of the antistatic agent can vary over a wide range as long as it is effective in reducing or removing electrostatic charge. When the agent is incorporated into the composition of the invention, a concentration of from about 1.0% by weight to about 0.001% by weight, based on the total composition, has been found to be most effective.

The solvents used with the compositions of the invention include organic compounds as well as water. While some solvents are useful, provided that there is no adverse effect on the substrate, trichlorotrifluoroethane is particularly desirable because it has suitable organic solubility, high volatility and essentially no physical chemical effect on the substrate. The trichlorotrifluoroethane may consist of each isomer, i.e. it may be 1,1,1-trichloro-2,2,2-trifluoroethane or 1,2,2-trichloro-1,2,2-trifluoroethane.

Other useful solvents according to the invention, either alone or in miscible combinations, include the following: Alcohols Ketones Esters methanol g of acetone, ethyl acetate, ethanol, methyl ethyl propyl acetate, n-propanol, methyl propyl isopropyl acetate, isopropanol, methyl isopropyl ketone butyl acetate, isobutanol, methyl isobutyl ketone, diethyl ketone, ethyl propyl ketone etylisopropylketon Halogenated hydrocarbons Hydrocarbons Ethers carbon tetrachloride, benzene, isopropyl ether, chloroform, toluene, diethyl ether methylene chloride xylene dioxane methyl chloroform pantane tetrachlorethylene hexane trichlorethylene heptane dichloroethane Octane dichloroethylene perfluorodimethylcyclobutane benzotrifluoride w_ 7808513-1 _ 10 the tracks or the thin depressions in a gramophone record, media, substrate or the like, after which there are dynamic recordings. For example, chips in the gramophone record usually comprise a small distance apart, U-shaped cracks or depressions with an opening of approximately 7.6 μm and with a bottom radius, which often amounts to 5.1 μm or less.

In order for the solvent to penetrate into the groove of the gramophone record, the solvent itself must have a high penetration ability, a property which obviously depends on a number of factors including surface tension, viscosity, volatility, etc. Solvents which have proven most effective for this purpose , are those which have a surface tension of less than about 20 dynes / cm (2006). For this reason, trichlorotrifluoroethane is a desirable solvent. A preferred composition of the present invention consists of an ester lubricant, an organic solvent and optimally an antistatic agent, which is preferably a tertiary amine, as defined above.

Lubrication of substrates of the invention can be accomplished by applying the composition of the invention, wherein the ester lubricants are usually present in a solvent in an amount of less than 3% by weight, a certain substrate, evaporation of the solvent therefrom, and light polishing. if desired, of the thus coated substrate to obtain a clear coating. Application of the composition can be carried out in various ways including spraying, dipping, brushing, treatment with a sponge, flowing and application by means of a doctor blade or the like. For most purposes, spraying and application by a sponge is preferred because of the complete and uniform coverage offered by these methods. To the composition of the present invention may be added minor amounts of various conventional components including antioxidants, pigments, hardeners, fillers, binders, odorants, dyes and the like, if required and to such an extent that these components or constituents are soluble or dispersible in the solvent. and does not impair the properties of the compositions of the invention.

The ester type lubricants according to the invention are those which are soluble in the above-mentioned solvents and for the most part they are not present in the compositions as particles or as colloidal suspensions. In fact, the compositions of the invention are usually substantially clear, homogeneous solutions, i.e. each composition has a uniform composition throughout its volume without any turbidity.

The ester type lubricants of the invention may be used in amounts ranging from about 3.0% to about 0.00% by weight, based on the total weight of the solution, preferably from about 0.2% to about 0.0% by weight. % and in 10 H 78Û8513 ~ 1 in particular from about 0.1% by weight to about 0.03% by weight. The resulting treated article, which also forms part of the present invention, was prepared by applying the compositions to the surface and removing the support therefrom, then precipitating a coating of the ester in an amount of from about 0.3 to 3 pg / cm 2.

Treatment of the various substrates of the invention may be carried out by applying the above-described compositions in a concentration generally less than about 3% by weight, by evaporating the solvent therefrom to obtain a coating or film thereon comprising an ester. . In practice, a concentration of between about 0.1 and 0.03% by weight has been found to be satisfactory for processing gramophone records. Furthermore, it has proved advantageous to perform a polishing after the treatment to give the playing surface a good luster.

The following are illustrative examples of preferred examples of the lubricant composition of the invention and methods of using it. However, the embodiments are not intended to limit the invention. In general, the composition according to the invention is one in which a volatile but effective carrier therein transports an ester, the composition forming a film on a certain substrate after the solvent has volatilized.

EXAMPLE I A solution was prepared comprising 99.96% by weight of trichlorotrifluoroethane ("Freon TF") and 0.04% by weight of perfluoroalkyl citrate (this triester is available under the tradename "Zonyl TBC" from EI du Pont de Nemours & Co., Nilmington, Delaware). A clear, homogeneous solution was obtained and sprayed on a pure test gramophone record, namely a test gramophone record No. 1-25-98 from the National Association of Broadcasters (NAB), whereby the trichlorotrifluoroethane was evaporated and the playing surface was lightly polished to leave a thin coating of said ester thereon.

A needle / groove coefficient of friction test was performed with the gramophone record before and after the described treatment by measuring the change in deceleration of the freely rotating gramophone record on a turntable, the change in deceleration being caused by the tone arm needle engaging the grooves in the record. This deceleration change is converted to needle / groove coefficient of friction by the following formula: f = It (At - Ab) s1n 4s ° - SR where f = coefficient of friction It = moment of inertia of the total rotating system, At = angular deceleration of the total effects of needle and turntable bearings, Ab = angular deceleration for the effect of only the turntable bearings, S = needle force on the disc, and the mean disc radius at the groove where the needle slides.

Using the above formula, the coefficient of friction before coating with the above-mentioned citrate composition was 0.35 and after the composition was applied, the coefficient of friction was reduced to 0.18.

Another composition was prepared as described above except that 0.04% by weight of fluoroalkyl stearate was used in place of the above citrate, this monoester being available from E.I. of Pont de Nemours & Co., Nilmington, Delaware, USA. The average perfluoroalkyl group in said monoester varied from heptyl to octyl. The coefficient of friction of the untreated gramophone record was 0.33, while the gramophone record treated with the fluoroalkyl stearate gave a coefficient of friction of 0.1.

EXAMPLE II Accelerated abrasion tests with gramophone records were performed with NAB type records, which were treated with the compositions described below. The results obtained with cleaned and treated discs were compared with the results of the abrasion test performed with a cleaned test disc, which was not treated in accordance with the invention. A graded scale was calculated, which varied from an estimated value avi0 before a clean, new and fine appearance to an estimated value of 100 for a surface which was substantially covered with abrasive dust. The experiment used a standard type turntable, which rotated at a speed of 33 l / 3_rpm, with the needle on the tone arm set to a load of 9.5 g on the surface of the gramophone record. This high needle load was used to speed up the abrasion process and thereby achieve better discrimination among the disc treatments. Various compositions of the invention were applied to the surfaces of the gramophone records in accordance with the procedure described in Example I. The results of the experiments after 1225-127 gigs are given in the table below: Disc Test Composition for Disc Treatment The disc surface appearance in solution: trichlorotrifluoroethane plus test end and relative to the following (% by weight) estimated value Relatively clean surface - scattered fine abrasive particles: value = l5 A 0.04% by weight fluoroalkyl citrate (average perfluoroalkyl moiety 7-8 carbon atoms) B 0.04% by weight fluoroalkyl stearate Fairly pure: very dispersed ( average perfluoroalkyl moiety fine particles 7-8 carbon atoms) value = 7 C Control disc Heavily covered with particles (Disc cleaned with mild abrasive dust of various detergents) u sizes: value = l00 The above examples show that the compositions according to the invention effectively prevent wear of the grooves in gramophone records, since the above test results show that the compositions of the invention gene significantly reduces wear at 30 40 V '7808513-1 a large number of gigs.

EXAMPLE 3 A solution was prepared comprising 99.96% by weight of trichlorotrifluoroethane ('Freon TF') and 0.04% by weight of perfluoroalkyl malonate, the average perfluoroalkyl moiety varying from heptyl to octyl. A clear, homogeneous solution was obtained and sprayed on a pure test gramophone record, National Association of Broadcasters (NAB) test record no. 12-5-98, after which the trichlorotrifluoroethane was allowed to evaporate and the playing surface was lightly polished to leave a thin coating of the diester thereon.

The needle / groove coefficient of friction test was performed in accordance with Example I.

The coefficient of friction between the needle and the groove was determined for the treated disc and amounted to 0.18. For comparison, the coefficient of friction, which was determined on untreated NAB boards, was approximately 0.32.

The accelerated disc wear test was also performed on the treated disc in accordance with Example II and resulted in the disc, in appearance, having a very clean surface, indicating a very small disc wear and a relatively estimated value of 1.0 was obtained.

EXAMPLE 4 A solution was prepared comprising 99.97% by weight of denatured alcohol (90% ethyl alcohol, 5% methyl alcohol and 5% water) and 0.03% by weight of polyoxyethylene glycol monostearate, the molecular weight of the polyoxyethylene glycol moiety being about 400.

A clear solution was obtained and sprayed on a test gramophone record, National Association of Broadcasters (NAB), the alcohol was allowed to evaporate, and the playing surface was lightly polished to leave a thin coating of the monoester thereon. The disc was then played and compared with an untreated disc to determine any changes in surface noise. For this purpose, the signal was transmitted from the needle, which followed the grooves in the disk with a load of 1 g, to an oscilloscope for indication. During the first gigs, the coated disc showed significantly less surface noise than the untreated disc, and gradually after about 120 plays, the background noise level or surface noise of the coated disc finally reached the noise level exhibited by the uncoated disc at its first play.

EXAMPLE V A solution was prepared comprising about 99.02% by weight of denatured alcohol (90% ethyl alcohol, 5% methyl alcohol and 5% water), about 0.05% by weight of polyoxyethylene glycol monostearate, and about 0.03% by weight of alkyldiethanolamine. The molecular weight of the polyoxyethylene glycol portion of the stearate ester was about 400, and the alkyl portion of the alkyl diethanolamine was C12-C14. A clear solution was obtained and this was sprayed on a NAB test gramophone record, the alcohol was allowed to evaporate and the playing surface was lightly polished.

The accelerated disc abrasion test of Example II was performed with the treated disc and resulted in the disc having a very clean surface, which indicated very little disc wear and a relatively estimated value of 2.0 was obtained. 7808513-1 14 EXAMPLES vi Another series of accelerated disc wear tests were performed with NAB7 test discs, which were treated with the compositions listed below. The results obtained with the cleaned and treated discs were compared with the results of abrasion tests performed with a cleaned test disc, which were not treated in accordance with the invention. A graduated scale was established, which varied from an estimated value of 0 for a clean, new and fine appearance to an estimated value of 100 for a surface which was substantially covered with abrasive dust. The test used a standard type automatic recorder, which rotated at a speed of 33 l / 3 revolutions per minute, setting the tone on the tone to a load of 9.5 g on the surface of the gramophone record. This high needle load was used to accelerate the abrasion process and thereby achieve better discrimination among the treatments of the discs. Various compositions of the invention were applied to the surfaces of the discs according to the procedure described in Example I. Test results after 125-127 gigs are given in the following table: Test disc Composition of disc treatment solution trichlorotrifluoroethane plus the following (% by weight) The appearance of the disc surface on completion and relative estimated value 1.0% tetrafluoroethylene telomer concentrate (20% solids) "Vydax AR", (decanted), plus 0.02% polyethylene glycol monolaurate (molecular weight of the polyethylene glycol moiety was about 600) 0.03% polyethylene glycol monolaurate (molecular weight was about 600) of ethylene glycol moiety 0.06% fluoroalkyl stearate (average perfluoroalkyl moiety was 7-8 carbon atoms) plus 0.04% polyethylene glycol monolaurate (molecular weight of the polyethylene glycol moiety was about 600) Control disk (disk cleaned with mild detergent) Fairly clean: a small number of fine abrasive particles: value = 3 Very clean: some fine abrasive particles: value = 2 Very clean: some fine abrasive particles: value = 3 Essentially covered with particles of abrasive dust with different particle sizes: value = l00.

The above Examples show that the composition according to the invention effectively prevents abrasion of the tracks in gramophone records, since the compositions have been found to markedly reduce abrasion after a large number of gigs performed.

In this description a method and a composition for lubricating surfaces have been described, and in particular those surfaces which are capable of having or have dynamic recordings thereon. In view of this description, those skilled in the art have many modifications which fall within the scope of the invention. It is intended that such modifications fall within the scope of the appended claims.

Claims (11)

10 15 20 25 30 35 40 fí PATsNikRAv A composition intended to impart to a surface which exhibits dynamic thereon, lubrication and abrasion resistance, characterized in comprising between 0.001 and 3,000% by weight of a mixture of solutes a carboxylate ester, said ester being derived from a fluoroalkanol and an ali fatty carboxylic acid having between 3 and 30 carbon atoms and an antistatic agent comprising amines, fatty quaternary ammonium compounds, fatty acid esters, phosphate esters and ethoxylated compounds, and between 97,000 and 99.999% by weight of a volatile solvent therefore. 2. A composition according to claim 1, characterized in that the amines are dialkanolamines and that the solvent is a halogenated hydrocarbon. Composition according to claim 1, characterized in that it comprises 0.01 to 0.20% by weight of said mixture of solutes, the acid being selected from the group consisting of monocarboxylic and polycarboxylic acids and 99.80-99. 99% by weight of a volatile solvent. 4. A composition according to claim 3, characterized in that the ester is a fluoroalkyl ester comprising fluoroalkyl monoesters, fluoroalkyl diesters, fluoroalkyl triesters and fluoroalkyl tetraesters, and that the solvent is a halogenated carbon. Composition according to claims 1 or 3, the solvent is an alcohol, a ketone, an ester, water, a halogenated characteristic of hydrocarbon or mixtures thereof. A composition according to claims 1, 3, 4 or 5, that the amines are dialkanolamines. Use of the composition according to claim 1 for treating a surface of a recording medium to lubricate the surface and to make it abrasion resistant, the surface being treated with a solution comprising 0.001-3,000% by weight of a mixture of solutes consisting of a carboxylate ester obtained from a fluoroalkanol and an aliphatic carboxylic acid having between 3 and 30 carbon atoms, wherein the acid is selected from the group consisting of monocarboxylic acids and polycarboxylic acids, an antistatic agent selected from the group consisting of amines, fatty quaternary ammonium compounds, fatty acid esters, phosphate esters and ethoxyl esters and 97 ethoxyl esters to 99.999% by weight of a volatile solvent therefore, and that the volatile solvent is removed therefrom. Use of the composition according to claim 7, ester selected from the group consisting of fluoroalkyl monoesters, fluoroalkyl diesters, fluoroalkyl triesters and fluoroalkyl tetraesters. Use of a composition according to claim 7 or 8, wherein the amines are dialkanolamines. Use of a composition according to claims 7, 8 or 9, wherein the solvent is a halogenated hydrocarbon. k ä n n e t e c k n a d of wherein the ester is a fluoroalkyl 7888513-1 W * Use of a composition according to any one of claims 7 to 10, wherein the removal of the solvent is carried out by means of frictional contact with a movable element.