Showing papers on "Liquid paraffin published in 1985"

Control of paratuberculosis (Johne's disease) in goats by vaccination

Abstract: After several years of unsuccessful efforts to eradicate paratuberculosis in goats in Norway by conventional methods such as general hygienic precautions and the isolation and slaughtering of clinically affected and serologically positive animals, a vaccination programme was initiated in 1967. The vaccine used consists of two live attenuated strains of Mycobacterium paratuberculosis suspended in a mixture of liquid paraffin, olive oil and pumice powder. The vaccine may be stored at 4 degrees C for two weeks, the dose is 1 ml and the goat kids are vaccinated at the age of two to four weeks. The efficacy of the vaccine has been judged mainly by post mortem examination of vaccinated and unvaccinated goats in the period 1967-82. During this period about 131,000 goats were vaccinated and, based on the post mortem examination of 15,219 goats, the infection rate was reduced from 53 to 1 per cent. Moreover, infection occurred almost exclusively in goats which for some reason or other had not been vaccinated or which had been too old when vaccinated. The results of these examinations showed that the adjuvanted vaccine with live M paratuberculosis bacteria offers a high degree of protection against paratuberculosis in goats.

The voluminal changes of swim bladder of larval red sea bream Pagrus major

Abstract: Rearing experiments were made to determine the mechanism of diel swim bladder inflation and deflation in the red sea bream Pagrus major larvae. Swim bladder volume index (V/L3•10-6) was found to increase remarkably with growth during the larval stage, and remain nearly constant in the juvenile stage.The volume index was higher at night than in the day time under natural light conditions. However, under constant 24-h illumination such differences could not be observed. By changing the light conditions from dazk to light, the volume index decreased to half within 2h. Furthermore, with the reverse changing from light to dark, it increased to maximum level about lh after the onset of dark. Sealing the water surface of the tank with a layer of liquid paraffin, did not interfere with swim bladder inflation under dark condition and larvae clearly displayed the diel rhythm of night-inflation and day-deflation under natural light conditions.These results suggest that increase in the swim bladder volume in the physoclist species of red sea bream, is not caused by swallowing air at the water surface such as takes place in the physostome species of anchovy, but by the internal gaseous exchange mechanism of the swim bladder according to environmental light conditions.

Non-toxic antifouling paint composition

Abstract: PURPOSE: To obtain the titled composition for ship, etc., stable for a long period and having excellent antifouling property, by compounding a silicone rubber curable by chemical reaction, a petrolatum or a mixture of petrolatum and liquid paraffin and a silicone oil having low viscosity. CONSTITUTION: The objective composition can be produced by uniformly mixing (A) 100pts.(wt.) of a silicone rubber curable by chemical reaction (preferably a one-pack type rubber curable at normal temperature) with (B) preferably 5W80pts. of a petrolatum (preferably semisolid at normal temperature) or a mixture of petrolatum and liquid paraffin (the kinetic viscosity of the mixture is preferably 5,000W12,000cst at 25°C) and (C) preferably 60W20pts. of a low- viscosity silicone oil (methyl silicone oil and/or methylphenyl silicone oil preferably having a kinetic viscosity of 0.65W20cst at 25°C). COPYRIGHT: (C)1987,JPO&Japio

Sterol-containing composition

Abstract: PURPOSE: The titled composition consisting of a sterol, emulsifying agent and dispersing agent or the titled hydrous composition obtained by homogenizing the titled composition with water while stirring. CONSTITUTION: A sterol-containing composition obtained by dissolving 5W60wt% sterol, e.g. cholesterol, β-sitosterol, stigmasterol, etc., 2W80wt% emulsifying agent, e.g. water gel type; glycerol ester or sorbitan ester of a fatty acid, etc., which is a lipophilic emulsifying agent having <8 HLB; water-dispersible type; sorbitan ester or polyglycerol ester of a fatty acid, lecithin, etc., having ≥8 HLB and 0W80wt% dispersing agent, e.g. fat or oil which is liquid at ordinary temperature, medium-chain triglyceride, squalene, squalane or liquid paraffin, while heating. For a hydrous composition, 30W3,500pts.wt. water may by used in 100pts.wt. above-mentioned composition. The above-mentioned composition can be used in many fields, e.g. prevention of water separation of margarine, etc., other humectant effect, sticking prevention effect, glossing effect, etc. COPYRIGHT: (C)1987,JPO&Japio

Antipruritic compositions and plasters

Abstract: An antipruritic plaster comprising a backing having formed on one surface thereof a pressure-sensitive adhesive medicament layer containing (1) at least one medicament selected from glycyrrhetinic acid esters thereof, glycyrrhizin, and salts of glycyrrhizin; (2) at least one solvent for (1) selected from benzyl alcohol, phenethyl alcohol, diphenhydramine, chlorpheniramine, N-methyl-2-pyrrolidone, crotamiton, and lauric acid diethanolamide, and (3) a base comprising [a] at least one rubber compound adhesive plaster base selected from natural rubber, styrene-butadiene copolymer elastomers, and styrene-isoprene-styrene copolymer elastomers; at least one tackifying agent selected from petroleum resin, rosin, hydrogenated rosin, polybutene, and ester gum; and at least one softener selected from polybutene, liquid paraffin, higher fatty acid esters, silicone oils, and vegetable oils or [b] acrylic resin.

Decomposition products of Dimers Arising from Secondary Oxidation of Methyl Linoleate Hydroperoxides

Abstract: Dimers formed in aerated methyl linoleate hydroperoxides were decomposed in liquid paraffin by bubbling with dry air at 30°C for 24 hr to identify the decomposition products. The aerated dimers were fractionated according to their molecular weights by gel permeation chromatography. Identification of the monomeric (25.6%) and low molecular fission products (10.8%) by gas chromatography-mass spectrometry showed the major monomers as methyl hydroxy-octadecadienoate, methyl hydroxy (or hydroperoxy)-epoxy-octadecenoate, methyl dihydroxy (or hydroperoxy)-octadecenoate, methyl trihydroxy (or hydroperoxy)-octadecenoate; and the major fission products as methyl 8-hydroxy-octanoate, 4-hydroxy (or hydroperoxy)-nonanal or -2-nonenal, methyl 12-oxo-9-hydroxy (or hydroperoxy)-dodecanoate or -10-dodecenoate, and methyl 11-oxo-9-undecenoate.The monomeric products were presumed to be derived from alkoxy radicals generated by the cleavage of peroxy linkages in the dimers, whereas the low molecular products were suggested t...

Ultra-violet absorbing compounds and compositions containing said compounds

Abstract: 2-Ethylhexyl and 2-octyl p-dimethylaminocinnamates unexpectedly are liquid at room temperature and miscible with liquid paraffin (i.e. mineral oil) unlike related alkyl p-dimethylaminocinnamates such as 1-octyl p-dimethylaminocinnamate. They absorb light in the melanogenic range 320 to 420 nm and are dermatologically acceptable and hence useful as UVA absorbers in sunscreen and cosmetic compositions.

Hydrophobic zeolite composition and its production

Abstract: PURPOSE: To obtain hydrophobic zeolite wherein the hygroscopicity of zeolite in itself is suppressed by treating the activated natural or synthetic zeolite with a coating agent or a soln. thereof having the hydrophobic property. CONSTITUTION: Activated natural or synthetic zeolite having ≥1.5 molar ratio of SiO 2 /Al 2 O 3 is prepared. After impregnating and treating it in a coating agent or a soln. thereof having the hydrophobic property at ≥50°C, a solid phase and a liquid phase are separated. Then the hydrophobic zeolite composition is obtained by heating the treated zeolite phase at ≥50°C and removing the residual solvent from the zeolite phase. As the coating agent, liquid paraffin having 0.8W0.9 specific gravity, a fluorine compd. and a silicon series compd. are used. COPYRIGHT: (C)1986,JPO&Japio

Studies of D-penicillamine on strain variability and lymph node cellularity in adjuvant arthritis.

Abstract: Experiments were performed in order to ascertain the action ofd-penicillamine (PA) on adjuvant arthritis (AA) in rats and to develop a quantitative evaluation method for PA-like drugs, using Lewis, SD, and Wistar rats. Rats were inoculated in the tail with 0.6 mg ofMycobacterium butyricum suspended in 0.1 ml of liquid paraffin. PA apparently induced enhancement of arthritis only in Lewis rats with a good reproducibility. The enhancing effect of PA was seen when it was administered during the period from day −7 to day −1, from day 0 to day 6, or from day 14 to day 20. In control group of Lewis and Wistar rats, adjuvant caused a rapid increase in the cell number of lymph nodes just after the inoculation, and also a marked increase in spleen cells coinciding with the development of arthritis. In PA-treated Lewis rats, the cell numbers of lymph nodes and spleen significantly surpassed those of control rats. However, PA induced no difference from control in Wistar rats, which were not sensitive to PA treatment during the course of arthritis. These results indicate that AA in Lewis rats is a good model for evaluating the activities of PA-like drugs and that PA may affect lymphocytes in lymph nodes and spleen and induce severer arthritis in Lewis rats.

Production of esterified product of magnolia alcohol and fatty acid, and cosmetic containing esterified product of magnolia alcohol and fatty acid

Abstract: PURPOSE:To provide a cosmetic containing an esterified product derived from magnolia alcohol and a fatty acid, giving refreshing feeling to the skin, and free from stimulation to the skin. CONSTITUTION:The objective cosmetic contains one or more kinds of the esterified products derived from (A) magnolia alcohol which is a mixture of unsaturated higher alcohols of the composition shown in the Table and obtained by the hydrolysis of magnolia oil and (B) a fatty acid such as isopalmitic acid, isostearic acid, stearic acid, oleic acid, etc. The esterified product has high compatibility with various oils or solvents such as liquid paraffin, isopropyl myristate, castor oil, ethanol, etc., and is a lubricant free from oiliness and giving refreshing feeling to the skin.

Hydrophobic antifungal zeolite composition and its production

Abstract: PURPOSE: To obtain the titled composition with hygroscopicity inherent in zeolite suppressed, suitable as additives to polymeric materials, by coating liquid paraffin on the surface of activated zeolite having antifungal metal. CONSTITUTION: Either natural or synthetic zeolite with a molar ratio: SiO 2 /Al 2 O 3 ≥1.5 (e.g., analcime, A-type zeolite) is immersed in an aqueous solution of antifungal metal (e.g., Ag, Cu, Zn) ion to perform ion exchange to prepare activated zeolite containing the antifungal metal. The resulting zeolite is impregnated at ≥50°C with either liquid paraffin with a specific gravity 0.8W0.9 and viscosity 9.5W80cst or its solution followed by separation of the solid phase from the liquid phase, the resultant zeolite phase being heated to ≥50°C to expel the residual solvent, thus obtaining the objective composition. COPYRIGHT: (C)1987,JPO&Japio

In vivo micro application of adrenaline to capillaries in frog mesentery.

Abstract: In-vivo studies were carried out on frog mesentery in order to determine the precise and specific actions of micropipette application of adrenaline on arterioles, precapillary sphincters and capillaries. A technique was employed, using liquid paraffin and micropipettes to deliver droplets to a particular microvessel; the droplets varied between 10-20 microns in diameter. All vessel types, including segments of capillaries, demonstrated constrictor responses to the local application of adrenaline. The time course of these constrictor events varied with the vessel type, with the sphincter being the most rapid in response.

Purfication of liquid paraffins

Abstract: Aromatic hydrocarbon impurities are removed from a liquid paraffin by contacting the liquid paraffin at relatively low temperatures (less than 120°C) with an X-type zeolite molecular sieve materiai. The contacting is performed without recycling and purified liquid paraffin containing less than about 0.01% by weight aromatics may be obtained.

Preparation of microcapsule containing enzyme

Abstract: PURPOSE:To encapsulate enzyme without lowering the activity thereof, by dispersing a liquid mixture consisting of an aqueous solution having a water-soluble polymer dissolved therein and enzyme or an enzyme-containing composition in liquid hydrocarbon and subsequently adding acetone to the resulting dispersion. CONSTITUTION:A liquid mixture consisting of an aqueous solution having a water-soluble polymer constituting a capsule wall dissolved therein and enzyme or an enzyme-containing composition is dispersed in liquid hydrocarbon and acetone is subsequently added to the resulting dispersion to prepare an enzyme- containing microcapsule. As the embodiment of the water-soluble polymer, there are polyvinyl alcohol and carboxy methyl cellulose, etc., and, as the embodiment of enzyme, there are protease, amylase, glucoamylase and liperse, etc. As the liquid hydrocarbon, there are n-hexane, n-heptane, n-octane and liquid paraffin, etc.

Composition and method for hair straightening

Abstract: Hair straightening composition based on an alkali metal hydroxide or an alkali metal alcoholate, consisting of a) 40 to 80% by weight of liquid paraffin and/or petrolatum and/or a solution of polyethylene in liquid paraffin, b) 0.5 to 8% by weight of lithium hydroxide, sodium hydroxide, potassium hydroxide or an aliphatic alcoholate of lithium, sodium or potassium with 1 to 5 carbon atoms, c) 2 to 59.5% by weight of at least one ethoxylated saturated or unsaturated C8-C18-fatty alcohol and/or ethoxylated C6-C14-alkylphenol with in each case 2 to 30 ethylene oxide units in the molecule, d) 0 to 10% by weight of water and, where appropriate, up to 40% by weight of additives customary for alkaline hair straightening compositions, and a method for straightening hair, in the application of which the abovementioned hair straightening composition displays an excellent cutaneous tolerability.

Production of polyglycolide or polylactide

Abstract: PURPOSE: To obtain a high-MW polyglycolide inexpensively, by polycondensing glycolic acid in the presence of a catalyst and adding liquid paraffin to the reaction system after reaching a specified MW. CONSTITUTION: Glycolic acid is polycondensed at 150W250°C in the presence of 0.01W1.0wt%, based on the acid, catalyst (e.g., stannous chloride). When the MW of the condensate reaches 2,000W6,000 after about 2W10hr from the start of the reaction, 5W30wt%, based on the acid, liquid paraffin is added to the reaction system and the reaction is further continued for about 1W20hr. This process is useful also for the production of a polylactide from lactic acid. COPYRIGHT: (C)1987,JPO&Japio

Formatin of metallic coating layer on surface

Abstract: PURPOSE:To form easily a uniform metallic coating layer in optional composition on the surface of a substrative metal by placing a thin metallic plate having specified properties on the surface of a substrative metallic material, and irradiating the plate with a high-energy density beam while controlling the energy density and irradiating time. CONSTITUTION:A thin film of an Fe-Cr-Ni-P-C alloy in 20-30mum thickness is placed on an Ni plate as a substrative metal, and liquid paraffin is interposed in-between. A high-energy density beam such as a laser and an electron beam is irradiated in a vacuum vessel to partially melt the alloy thin film, and a molten thin film of the alloy is formed while forming an alloy of both Ni and alloy between the substrative Ni and the alloy. Or the third metal which can be easily cemented to the surface of the substrative metal is previously plated on the surface of the substrative metal, the alloy thin film is placed thereon, and a beam is irradiated. The energy density and irradiation time are controlled, and an amorphous Fe-Cr-Ni-P-C alloy coating layer having excellent corrosion resistance, toughness, and strength is formed.

Transparent gel composition for cleansing skin

Abstract: PURPOSE:The titled composition showing improved gelatinous state, having improved washing performances, obtained by blending a hydrophilic sucross fatty acid ester, a polyhydric alcohol alkyl ether, a polyhydric alcohol, an anionic surface active agent, and a specific liquid oil in a specified ratio. CONSTITUTION:(A) 0.45-40wt% based on total amount of composition of a hydrophilic sucrose fatty acid ester (mono- or diester having >=9 HLB and 12-22C of fatty acid residue) is blended with (B) 0.05-16wt% polyhydric alcohol alkyl ester having 12-22C alkyl group, (C) 1.5-72wt% polyhydric alcohol such as glycerin, sucrose, etc., (D) 0.1-20wt% anionic surface active agent, and (E) 20- 95wt% liquid oil comprising a hydrocarbon oil such as liquid paraffin, etc. and an ester oil sich as isoproylmyristate, etc. in a weight ratio of the former to the latter of (20-90):(10-80). To obtain a transparent gel having improved washing feeling, a weight ratio of (A+B+C):(D+E) is preferably (5-80):(20-95) and a weight ratio of A:B:C is preferably (9-50):(1-20):(30-90).

Adsorption of 1-olefin/ n -paraffin liquid mixtures on NaX and NaY zeolites

Abstract: The isotherm equation for adsorption of binary liquid mixtures of nonelectrolytes, involving differences in molecular sizes of components and quasi-Gaussian energy distribution of adsorption sites, is used to describe the excess adsorption data for 1-olefin/n-paraffin liquid mixtures on NaX and NaY zeolites at 293 K. This equation gives a good representation of the above adsorption data. Analysis of these data showed that the heterogeneity parameter is slightly dependent on the difference in molecular sizes of both components.

Peat extract which can be used in cosmetic products, and process for its preparation

Abstract: The invention describes the composition and preparation of an extract, which has only a yellowish colour, from peat, which is suitable, owing to the absence of the typical dark brown-coloured humic acids and fulvic acids of the peat, and the presence of the complete lipoid fraction of the peat, to be employed as carrier of the peat active substances in uncoloured cosmetic products. Isopropyl myristate and liquid paraffin are mentioned as solvents for the peat lipoids. The ratio of the extractant to the finely ground air-dried peat is 2.5:1 to 6:1. Extraction takes place at 70 DEG -95 DEG C with continuous stirring. The extract must be filtered off immediately and quickly because peat lipoid constituents precipitate out of the extract again on cooling. However, these can be resuspended again satisfactorily in the extract at room temperature.

Powdery, dental alginate impression material having low scattering property of dust

Abstract: PURPOSE:The titled impression material having low scattering properties of dust, obtained by blending an alginate impression material composition with a hydrocarbon having no volatility, showing hydrophobic nature, and almost no affinity for water and/or a silicone oil, and a small amount of polyvinyl pyrrolidone. CONSTITUTION:A dental alginate impression material consisting of an alginate, gelatinizing agent, gelatinizing adjustor, and filler is blended with one or more of a hydrocarbon (e.g., squalane, squalene, liquid paraffin, etc.) having <=3.15mm. Hg vapor pressure at 20 deg.C, showing hydrophobic nature and a silicone oil (e.g., dimethylpolysiloxane oil, etc.) containing no hydrophilic group (preferably 1- 5wt% based on total amount) and polyvinyl pyrrolidone (0.1-1wt%) to give a dental alginate impression material. EFFECT:Having improved shelf stability and accuracy of gypsum cast.

Tackifier-relaxing spray

Abstract: PURPOSE:To obtain titled spray capable of relaxing adhesive force through spraying to the surface of, e.g., adhesive tape to make said tape free to attach or detach, by mixing liquid paraffin and a solvent such as 1,1,1-trichloroethane capable of dissolving said paraffin to make the resulting mixture sprayable. CONSTITUTION:Liquid paraffin is incorporated with a solvent dissoluvable for at least said paraffin (e.g., 1,1,1-trichloroethane). The resultant mixture is put, together with a propellant such as DME, in a container equipped with nozzle to effect sprayable, thus obtaining the objective spray. On spraying this liquid to the surface 1 of an adhesive tape 2 such as gummed tape, the fine particles of said liquid paraffin in the spray is mixed with the adhesive in the tape 2, whereas the adhesive layer 1a persists on the surface layer of the tape 2, thus maintaining the adhesive force of the tape 2; furthermore, avoiding the breakage on the surface of corrugated box when peeling off the tape.

Production of spherical gelatin gel

Abstract: PURPOSE:To obtain spherical gelatin gel applicable as a blood vessel plugging material or a carrier for impregnating pharmaceuticals, by dissolving gelatin and a water-soluble compound capable of crosslinking the gelatin in water, dispersing the solution in a liquid incompatible with water, and carrying out the crosslinking reaction of gelatin. CONSTITUTION:Gelatin is dispersed in a water-incompatible liquid (a liquid having a viscosity of 10cps-10ps/25 deg.C and obtained by dissolving a water-insoluble solid in liquid paraffin, etc. to raise the viscosity of paraffin). An aqueous solution of a water-soluble compound capable of crosslinking the gelatin (e.g. formaldehyde) is added to the dispersion and the gelatin is crosslinked to obtain the objective gel.

Closed and circulating type processing facility for filthy matter

Abstract: PURPOSE:To offer the facility capable of incinerating a transferred filth under odorless and non environmental pollution condition by a method wherein a low specific gravity solution such as a liquid paraffin is utilized as a transferring medium, a filth such as an excrement, a dust and the like are transferred to an incinerating furnace without any water supply and draining. CONSTITUTION:A filth B falls in a receiver 1, and a germicide (for instance, phenol) for transferring the filth B to a separating tank 2 is dissolved into a low specific gravity solution A (for instance, liquid paraffin), then the solution A is circulated and supplied from the separating tank 2 to the receiver 1 through a phenol dissolving vessel 3 with a pump P1. The pump P1 is driven by an output signal from a sensor 4 for detecting a user, the low specific gravity solution A is supplied into the receiver 1 before the falling of the filth B into the receiver 1. Thereby, the receiver 1 is prevented from the adhesion of the filth B, accordingly, cleaned perfectly. The phenol solution vessel 3 is connected between the pump P1 and the receiver 1, while the phenol solution vessel 3 is filled with a phenol splinter inside thereof, and formed so that the low specific gravity solution A is passed through the inside of the phenol solution vessel 3.

Ink inverse flow preventing material composition for aqueous ball-point pen

Abstract: PURPOSE: The titled composition for preventing ink inverse flow, suitable for aqueous ink having constant viscosity, comprising a slightly volatile organic liquid or a nonvolatile organic liquid of hydrocarbon, a gelatinizing agent and a specific N-polyoxyethylenealkylamine. CONSTITUTION: An ink inverse flow preventing material composition for aqueous ball-point pen wherein an ink storage tube is packed with aqueous ink having 50W2,000CPS viscosity at 25°C, containing (A) a slightly volatile organic liquid or nonvolatile organic liquid (e.g. liquid paraffin, etc.,) of hydrocarbon as a base, (B) a gelatinizing agent (e.g., fine particle silica, etc.,) and (C) an N- polyoxyethylenealkylamine shown by the formula (R is 8W24C alkyl; m and n are 0 or ≥1 integer and m+n is 1W20). COPYRIGHT: (C)1987,JPO&Japio

Production of microporous polyethylene material

Abstract: PURPOSE:To produce the titled material having fine orientated pores, by molding a mixture of specified PE and paraffin into a plate, rolling the plate and removing the paraffin by extraction. CONSTITUTION:1pt.wt. powdered PE of a weight-average MW of 2X10 -5X10 is mixed with 1-10pts.wt. solid or liquid paraffin and the mixture is heated, after deaeration, to a temperature >= the m.p. of the PE to dissolve it in the paraffin. The obtained thick solution is homogenized by kneading in a screw extruder, a mixer, or the like and extruded through a die slit into a plate. This plate is solidified by cooling to a temperature <= the solidifying point of the PE, and rolled at 60-120 deg.C by rollers to a thickness which is 1/3-1/40 time the initial thickness. This rolled plate is immersed in a volatile organic solvent to remove the paraffin by extraction. EFFECT:It is possible to form pores of a size which is about one tenth that of the conventional. The control of a pore size is easy, and a porosity of 70% at maximum can be attained.

Composition for preventing oil painting color from drying

Abstract: PURPOSE:To provide the titled compsn. which can eliminate the waste of oil color and save labor in cleaning a palette by applying it to oil painting color left behind on the palette, consisting of a specified nonvolatile org. liquid, a soluble antioxidant, an oil-soluble resin and an org. solvent. CONSTITUTION:1-50wt% nonvolatile org. liquid (A) selected from among animal and vegetable oils (e.g., linseed oil), mineral oils (e.g. liquid paraffin) and plasticizers (e.g. dioctyl phthalate), 0.1-20wt% antioxidant (B) (e.g. butylhydroxytoluene) soluble in component A, 3-25wt% oil-soluble resin (C) (e.g. oil-modified alkyd resin) soluble in component A, and 20-95wt% org. solvent (D) (e.g. toluene) are introduced into a dissolving tank and heated at 75 deg.C with stirring until components B and C are completely dissolved to form a clear soln.

Manufacture of magnetic disk

Abstract: PURPOSE:To absorb the impact force of a head and to improve the durability, etc. by forming a protective film on a magnetic recording layer on a substrate, coating a solvent contg. Si and a liquid contg. a substance which is easy to decompose by heat, etc. on the protective film, forming a rugged film, then coating a soln. of thermosetting resin, and baking. CONSTITUTION:An anodized aluminum film 2 and a magnetic recording layer 3 are successively formed on an Al substrate 1, and a liquid mixture of a solvent contg. Si and a substance which is easily decomposable by heat or a substance which is easily vaporizable by heat (e.g., liquid paraffin) is coated, and baked. The liquid mixture is cured, and the substance which is easily decomposed by heat is simultaneously decomposed and vaporized to form a protective film 4 having innumerable protrusions 8. Then a soln. of ethyl cellosolve acetate contg. 0.2-1.0% thermosetting resin (e.g., phenol resin) is coated and baked at 230- 250 deg.C to form a rugged resinous film 9. A lubricant 5 is finally coated on the film 9. The adhesion of a magnetic head to a disk is prevented by protrusions 8, and the coefficient of friction is reduced. Accordingly, the damage of the magnetic film 3 due to the impact of the head can be prevented.