SUBSTANCE: invention relates to an immersion liquid which can be used in optical instrument-making for investigating optical parameters of inorganic materials and optical components, including large, irregularly shaped articles. The immersion liquid for optical investigation contains 97-99 wt % meta-bis(meta-phenoxyphenoxy)benzene and 1-3 wt % 2-naphthol. To reduce viscosity and surface tension, the immersion liquid may further contain 0.1-3 wt % dibutyl sebacate per 100 wt % of said composition.
EFFECT: disclosed immersion liquid is nontoxic, has a good refraction index nD>1,6 and high adhesion to inorganic optical materials, which enables to deposit on the entire surface of the investigated substrate or part thereof a thin immersion layer and use thereof for effective quality control of large optical articles without immersion in a cell with an immersion liquid.
2 cl, 2 dwg, 2 tbl, 2 ex
The invention relates to applied chemistry and can be used as an immersion liquid in an optical instrument for monitoring optical parameters of inorganic materials and optical components, including large complex-shaped products.
Known immersion liquid on the basis of white phosphorus, methylene iodide, organic solvents β-bromonaphtalene, bromoform, decaline, tetraline, which have a high refractive index (1.5) (Handbook of chemistry, I. 4, M-L.: Chemistry, S. 821). The disadvantages of these fluids is their high toxicity, extreme toxicity, explosiveness and high cost.
Known with high refraction liquids Meirovitch (Geological dictionary. - M.: Nedra. Edited by K. N. Paffenholz and others, 1978, T. 1, 486 C.) selenium Se, sulphide of arsenic As2S3, bromide arsenic AsBr3and methylene iodide CH2I2and the immersion liquid based on methylene iodide CH2I2containing white phosphorus bromide arsenic AsBr3the sulphide of arsenic As2S3, sulfur, tin iodide SnI4and antimony iodide SbI3. These fluids are highly toxic and rapidly decompose under the action of light.
Known more cheap and safe liquid on the basis of the iodides of the metals. For example, an aqueous solution jodidamente and cadmium chloride and zinc, with a maximum refractive index of n D=1.625 (USSR Author's certificate N 948994, NC: C09K 3/00 and G01M 11/00, published 07.08.1982). But when a sufficient stability of this liquid it is not possible to obtain a higher refractive indices simultaneously with large viscosities.
Known less stable fluid in the form of an aqueous solution of iodide of zinc with a refractive index of nD=1.64 (RF Patent No. 2051940, NC: C09K 3/00, G02B 1/06 and G01M 1/00, published 10.01.1996), the viscosity of which is achieved large values of (8.1 relative to water). But the downside of this fluid is the fragility maintain its high optical properties. After a few days in liquid complexes are formed, changing its optical properties.
Known technical solutions closest to destination and technical nature of the claimed object is immersion liquid for optical studies containing iodide of cadmium CdI2the sodium iodide NaI and water that is described in the patent of the Russian Federation 2134708, NC: C09K 3/00 and G02B 1/06 published 20.08.1999. The patent States that liquid stable, low-toxic, easily washed off with water, has a high refractive index. At the maximum refractive index of nD=1,66 density of the liquid is equal 2,787, and the relative viscosity has a value of 7.7.
Immersion liquid, which can be used to control Krupnov baranich parts of the modern single crystals, optical glasses or ceramics (such as optical parts made of synthetic sapphire, alumomagnesium spinel, yttrium aluminium garnet, various glasses, and others), must meet the following requirements:
1) have a high (n>1,6) refractive index and high transparency in the visible part of the spectrum;
2) to have high adhesion to the surface of the inorganic optical materials;
3) immersion liquid and its components must be non-toxic;
4) possess a high boiling point and low vapor at room temperature.
Immersion liquid, is described in the patent of the Russian Federation 2134708, has significant drawbacks - high toxicity (the presence in its composition of iodide of cadmium CdI2), it also allows you to get a thin layer on the surface of the test object with the necessary uniformity and stability properties at the time of testing (due to water evaporation).
The present invention is to create a non-toxic with high refraction immersion liquid having a high adhesion to inorganic optical materials. This allows you to get on the surface of the tested materials and products thin layers immersion without putting large items in the cuvette with the immersion liquid. The absence of toxic components PR the environmental safety of the proposed use of the immersion liquid.
New immersion liquid to control large with high refraction of optical materials and products contains high-boiling, viscous organic compounds.
The technical result is achieved by using as the immersion liquid mixture of meta-bis (meta, phenoxyphenoxy) benzene with 2-naphthol. The chemical composition of the immersion liquid (wt.%):
To reduce the thickness of the layer of immersion that is applied to the material, it is necessary to reduce the viscosity and surface tension of the liquid without changing its refractive index. For this purpose, the composition of the immersion liquid may additionally be injected 0.1 to 3 wt.% dibutylsebacate (over 100%).
The refractive index of the immersion liquid in the visible part of the spectrum is 1,63-1,64. Both fluids are characterized by high evaporating temperatures (Tinstrumentation·(1)>360°C; Tinstrumentation·(2)>290°C) and low values of the elasticity of steam (≤5 10-7mm Hg) at room temperature, which determines the absence of evaporation of the immersion liquid. This ensures the stability properties of the layer immersion the first liquid and the absence of unpleasant odors and toxic fumes in the process of testing optical materials. The introduction of the material 2-naphthol stabilizes the structure and properties of the material.
The mere fact that the introduction of the immersion liquid aromatic hydrocarbons does not provide a significant increase in the refractive index of the liquid. So, for example, U.S. patent No. 4465621 describes the immersion liquid, consisting of butyl benzyl phthalate, mixed with diallylphthalate and/or chlorinated paraffin, and having a refractive index in the visible part of the spectrum only 1,49-1,53.
In the description of U.S. patent No. 4832855 immersion liquid based on dialkylamide ester of phthalic acid and chlorinated paraffin has a refractive index to the visible part of the spectrum in the range 1,50-1,60. However, in the examples described in this patent, the values of the refractive index of the immersion liquid does not exceed 1,52.
To obtain a thin layer on the surface of the test material immersion liquid is applied by brush or swab, and when diluted volatile solvent (e.g. acetone) by spraying. After applying a layer of immersion liquid on the ground or frosted surface of the test specimen while scanning can be defined inclusions, bubbles, cords and other defects in the material volume.
Developed immersion liquid may also be used in mi is roscopy when creating immersion lenses.
In Fig.1 shows a photograph of a polished slice of a crystal of gallium-scandium-gadolinium garnet without immersion liquid.
In Fig.2 shows a photograph of a polished slice of a crystal of gallium-scandium-gadolinium garnet coated with a new layer of immersion liquid.
Manufactured immersion liquid by mixing at room temperature components under item 1 of the formula at different ratios. Chemical composition and properties of liquids are given in table 1. Without additives modifying component (2-naphthol) the main component of the immersion fluid - meta-bis(meta-phenoxyphenoxy) benzene - prone to spontaneous crystallization transition in the gel state and the loss of high optical homogeneity. The introduction of the immersion liquid 1-3 wt.% 2-naphthol stabilize its structure and allows to obtain a highly homogeneous transparent viscous composition having a high refractive index (nD>1,6). Experiments have also shown that the introduction of the immersion liquid than 3 wt.% 2-naphthol leads to its dimness.
|Chemical composition and properties of the immersion fluid.|
|Chemical composition, wt.%||The properties of the immersion liquid|
|meta-bis(meta-phenoxyphenoxy)benzene||2-naphthol||Appearance||The refractive index, nD||Viscosity, SP|
|1||100,0||-||Inhomogeneous gel-like substance||-||-|
|2||99,0||1,0||Viscous transparent liquid||1,633||3600|
|3||98,0||2,0||Viscous transparent liquid||1,636||3480|
|4||97,0||3,0||Viscous transparent liquid||1,640||3410|
Manufactured immersion liquid by mixing at room temperature components under item 2 formulas for different ratios. Chemical composition and properties of the fluids are shown in table 2.
|Chemical composition and properties of the immersion fluid.|
|Chemical composition, wt.%||The properties of the immersion liquid|
|meta-bis(meta-phenoxyphenoxy)benzene||2-naphthol||Dibutylsebacate (over 100%)||The refractive index of nD||Viscosity, SP|
The table shows that the introduction of the immersion liquid supplements dibutylsebacate up to 3 wt.% (over 100%) leads to a significant reduction of its viscosity, the value of the refractive index is almost unchanged. The introduction of this additive in the amount of more than 3 wt.% leads to an undesirable decrease of the refractive index of the immersion liquid.
Developed immersion liquid can be used to control the optical homogeneity of products made of different optical materials. As a subject was selected crystal gallium-scandium-gadolinium garnet (GSGG). From crystal boules GSGG having a cylindrical shape, cut the sample in the form of a plate thickness of 3 mm, the Opposite ends of the sample were polished. Immersion composition was applied with a swab on the polished end surface of the sample crystal. The sample was placed between crossed Polaroids, allowing to visually observe the distortion of analogo front, due to the presence in the sample of the external phase, smiley or stress.
Comparison of the images shown in Fig.1 and 2, demonstrates the high effectiveness of the developed immersion fluid for quality control of optical elements.
1. Immersion liquid for optical studies with meta-bis(meta-phenoxyphenoxy)benzene and 2-naphthol in the following ratio, wt. %:
2. Immersion liquid under item 1, characterized in that it further contains 0.1 to 3 weight. % dibutylsebacate in excess of 100 weight. % the composition of the immersion liquid on p. 1.
FIELD: physics, optics.
SUBSTANCE: invention relates to visible light absorbers, particularly novel azo compound monomers, particularly suitable for use in materials for implantable ophthalmic lens materials. The ophthalmic device material includes an azo compound, a device forming acrylic monomer and a cross-linking agent. The ophthalmic device is made from the ophthalmic device material and is in the form of intraocular lenses, contact lenses, keratoprostheses and corneal inlays or rings.
EFFECT: azo compounds are suitable for use as monomers which absorb part of the visible light spectrum (about 380-495 nm).
17 cl, 6 dwg, 3 tbl
SUBSTANCE: free form ophthalmic lens comprises a first optical zone portion comprising multiple voxels of polymerised crosslinkable material containing a photoabsorptive component. The optical zone portion comprises a first area having a first refraction index and a second area having a second refraction index; and a second portion comprising a layered volume of crosslinkable material polymerised beyond the gel point of the crosslinkable material.
EFFECT: obtaining ophthalmic lenses with a free form surface and areas with different refraction indices, which enable to correct vision by changing the focal distance.
18 cl, 19 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to production of sandwiched materials used in thin-film instruments and devices. Proposed levelling film comprises levelling ply containing binding polymer resin and inorganic filler as components, at least, on one side of transparent polymer substrate. Note here that the number of foreign particles with mean diameter of 20-100 mcm on levelling air surface does not exceed 5 per m2.
EFFECT: decreased amount of linear defects at production of thin-film transistor on film surface.
3 cl, 1 tbl, 3 ex, 2 dwg
FIELD: physics, optics.
SUBSTANCE: group of inventions relates to producing a terbium aluminium garnet monocrystal which can be used as a Faraday rotator for optical insulators. In the terbium aluminium garnet monocrystal, a portion of aluminium is at least replaced with scandium and a portion of at least aluminium or terbium is replaced with at least one component selected from a group consisting of thulium, ytterbium and yttrium, wherein the garnet monocrystal has the general formula (Tb3-x-zSczMx) (Sc2-yMy) Al3O12 (1), where M represents at least one component selected from a group consisting of Tm, Yb and Y, and x, y and z satisfy the following relationship: 0<x+y≤0.30 and 0≤z≤0.30.
EFFECT: present monocrystal has a high light transmission factor in a wide wavelength range and a wide Faraday rotation angle with cracking-resistance.
8 cl, 3 dwg, 1 tbl, 12 ex
SUBSTANCE: invention relates to polymers for producing ionic silicone hydrogels suitable for making ophthalmic devices. Disclosed are polymers obtained from reactive components comprising at least one silicone-containing component which includes at least one trimethylsilyl group and at least one ionic component comprising at least one anionic group, which is a carboxylic acid-containing component. Also disclosed is a contact lens made from the disclosed polymers.
EFFECT: disclosed polymers demonstrate improved thermal stability and desirable protein uptake.
24 cl, 5 dwg, 10 tbl, 18 ex
SUBSTANCE: invention refers to ophthalmic devices and methods for preparing them. What is presented is a soft silicone hydrogel contact lens which possesses an ability to deliver a hydrophobic comfort-maintaining agent (phospholipid, glycolipid, glyceroglycolipid, sphingolipid, sphingoglycolipid, fatty alcohol containing 8 to 36 carbon atoms, or a mixture thereof) into the user's eye gradually releasing it from a polymer matrix consisting of hydrophobic chains formed of a silicon monomer or macromere, and hydrophilic chains formed of a hydrophilic monomer or macromere when in use. What is also presented is a method for making the above contact lens.
EFFECT: in the presented soft silicone contact lens, the hydrophobic comfort-maintaining agent is not covalently bond to the polymer matrix wherein it is distributed and can be released from the soft hydrogel contact lens into the user's eye when in use reliably for a long period of time and thereby reinforcing and stabilising a lipid layer of the lachrymal fluid film and reducing eye dryness.
16 cl, 2 tbl, 7 ex
FIELD: physics, optics.
SUBSTANCE: device has a base and a plurality of convex and concave structural elements arranged on the surface of the base with spacing which is equal to or less than the wavelength of visible light. The structural elements form a plurality of tracks and form a structure of a quadrangular or quasi-quadrangular array. In one version, each structural element has the shape of an elliptical or truncated elliptical cone, the long axis of which is parallel to the track. In another version, the ratio ((2r/P1)×100) of the diameter 2r to the spacing P1 is 127% or higher, where P1 is the spacing between structural elements on the same track, and 2r is the diameter of the lower surface of the structural element in the direction of the track. The method is carried out by forming a resist layer on the peripheral surface of a columnar or cylindrical standard mould, forming latent images via interrupted irradiation of the resist layer with a laser beam while rotating the standard mould with relative displacement of the laser beam spot parallel to its central axis, forming a resist structure via development thereof and forming structural elements by etching using the resist structure as a mask.
EFFECT: improved antireflection characteristics.
12 cl, 6 tbl, 67 dwg
SUBSTANCE: initial raw material in the form of a briquette of a powder of aluminium-magnesium spinel with stoichiometric composition, alloyed with 1 wt % of lithium fluoride is sintered in vacuum at a temperature of 1100-1500°C. The obtained briquette with a diameter equal to the diameter of the mould is loaded into the mould, with its further compression at a temperature of 1550-1600°C for 5-30 minutes under pressure of 350-500 kg/cm2, kept for 30-55 minutes and cooled.
EFFECT: obtaining a polycrystalline optical material from aluminium-magnesium spinel.
1 ex, 1 tbl
SUBSTANCE: described are novel derivatives of benzotriazole of general formula , where X is C3-C4 alkenylene, C3-C4 alkylene, CH2CH2CH2SCH2CH2 or CH2CH2CH2SCH2CH2CH2; Y is hydrogen, if X is C3-C4 alkenylene, or Y is -O-C(=O)-C(R1)=CH2, if X is C3-C4 alkylene, CH2CH2CH2SCH2CH2 or CH2CH2CH2SCH2CH2CH2; R1is CH3 or CH2CH3; R2 is C1-C4 alkyl, and R3is F, Cl, Br, I or CF3.
EFFECT: compounds are absorbers of UV/visible light and can be applied in production of materials for ophthalmological lenses.
5 cl, 3 dwg, 5 tbl, 6 ex
FIELD: physics, optics.
SUBSTANCE: invention relates to means of displaying on liquid crystals. The electroconductive optical device has a base element and a transparent electroconductive film formed on the base element. The structure of the surface of the transparent electroconductive film includes a plurality of bulging portions with antireflection properties and arranged with spacing equal to or less than the wavelength of visible light.
EFFECT: improved antireflection properties of the electroconductive optical device.
16 cl, 57 dwg
SUBSTANCE: invention relates to a light-sensitive polymer composition, suitable for obtaining various microdevices for microelectromechanical systems and other systems, as well as to a method of the structure obtaining and to a head for a liquid supply. The polymer composition contains the following components: (a) epoxy resin, which can be polymerised in the presence of an acid; (b) photoacid-generating agent, which contains an onium salt, containing a structure of a cationic part, represented by formula , and a structure of an anionic part, represented by formula , and (d) one of diphenyl, naphthalene and anthracene compounds, containing one of the following compounds: The component (b) absorbs, at least, 50% of quantity of light with the wavelength of 365 nm, absorbed by the light-sensitive polymer composition. The method of the structure obtaining consists in the following: a substrate, containing a layer of the said light-sensitive polymer composition is taken and irradiated by light. After that, an irradiated part is hardened and a non-solidified part is removed. After that, a solidified part is heated at a temperature, of at least, 140 degrees Celsius to obtain the structure. The head for the liquid supply contains an element of a hole for supply, containing the hole for supply, constructed for the liquid supply. The element of the hole for supply is obtained from the product of hardening of the said light-sensitive polymer composition.
EFFECT: invention makes it possible to obtain the structure with high sensitivity and high shape correctness.
9 cl, 9 dwg, 4 tbl, 9 ex
SUBSTANCE: invention relates to demulsifier compositions (versions) containing: (a) an anionic surfactant selected from a group consisting of alkylsulphosuccinates, alkyl phosphate esters, alkylphosphonic acids, salts thereof, and combinations thereof; and/or (b) a nonionic surfactant selected from a group consisting of ethylene oxide and propylene oxide copolymers, ethoxylated fatty acid esters and polyethylene glycol, terpene alkoxylates, alcohol ethoxylates, modified alkanolamides, and combinations thereof; and (c) a solvent base composition containing a mixture of dibasic esters. The present invention also relates to methods of breaking oil and water emulsions (versions).
EFFECT: obtaining solvent bases for use in demulsifier compositions, which have less toxicity and are environmentally safer.
40 cl, 6 tbl, 2 dwg
FIELD: medicine, pharmaceutics.
SUBSTANCE: invention relates to application of ester compounds of benzoic acid, taken from group, which includes 1-phenylvinyl 4-methoxybenzoate; 1-(4-methoxyphenyl)-vinyl 4-tert-butyl benzoate, 1-(4-tert-butylphenyl)-vinyl 4-methoxybenzoate, 1-phenylvinyl 4-tert-butyl benzoate, 4-benzoyloxy-2-methoxybenzolsulphonic acid, 3-diethylaminophenyl benzoate and 3-(1-pyrrolidinyl) phenyl benzoate and 3-methoxy salicylate, as component for preparing composition for protection of human organism or animal or material from ultraviolet radiation, containing effective quantity at least one of claimed compounds, as component for preparing composition, which is characterised by progressive protection from UV radiation, depending on duration of sun influence and level of sun radiation, as component for preparing composition for individual hygiene, which is characterised by progressive protection from UV radiation, depending on duration of sun influence and level of sun radiation, as component for preparing industrial composition, which is characterised by progressive protection from UV radiation, depending on duration of sun influence and level of sun radiation, and as component for preparing composition, which at photo-regrouping shows quantity of obtained UV-B radiation.
EFFECT: invention also relates to composition for protecting human or animal organism or protection of material from ultraviolet radiation, contains effective quantity of at least one above mentioned ester compound of benzoic acid.
40 cl, 6 dwg, 33 ex
FIELD: oil and gas industry.
SUBSTANCE: inhibitor consists of mixture of solvent from alcohol and hydrocarbon compounds and additive in the form of quaternary ammonium salt of vegetable oil alkilimidasoline and benzyl chloride of the following general formula: where R - acid radical of vegetable oil of selected group: caprylic, capric, lauric, myristic, palmitic, palmitoleic, stearic, oleic, linoleic, arachidic, linolenic, gondoinic, behenic, erucic. Component ratio in the mixture, wt %: additive - 1.0-30.0; solvent - 70-99.
EFFECT: invention allows preventing formation of high-molecular deposits on the surface of equipment and corrosion of metal.
2 tbl, 14 ex
FIELD: process engineering.
SUBSTANCE: invention relates to abrasive grain mix bonded by inorganic binder. Mix structure is formed by multiple abrasive grains. Note here that abrasive grain is selected from the group consisting of corundum, fused corundum, sintered corundum, zirconium corundum, silicon carbide, boron carbide, cubic boron nitride, diamond and/or mixed thereof, and bonded by inorganic binder. Said binder is based on aluminium silicate, liquid glass and water. Note here that molar ratio of Al2O3 components to those of SiO2 in binder varies from 1:2 to 1:20. Proposed method comprises mixing abrasive grains with binder, drying produced mix at 100°C - 150°C and curing the mix at 200°C to approx. 450°C.
EFFECT: highest possible hardness.
18 cl, 3 dwg, 2 tbl, 3 ex
FIELD: organic chemistry.
SUBSTANCE: invention refers to using a flocculating and sequestering agent with the organic solution as an agent to facilitate such purification. A method of purifying an organic solution, comprising contacting a flocculating and sequestering agent with the organic solution, which organic solution comprises fatty acid alkyl esters, wherein the water content of the organic solution is equal or less than 5% by weight, when the pH in the organic solution is 9 to 12, wherein the flocculating and sequestering agent is chosen from polyaluminium coagulants. There is provided a process for purification of an organic solution of fatty acid alkyl esters suitable for use as biodiesel, comprising: adding a flocculating and sequestering agent chosen from polyaluminium coagulants to the organic solution so as to facilitate the purification when the pH in the organic solution is 9 to 12 and removing a portion from the organic solution, which portion comprises the flocculating and sequestering agent, and impurities, wherein the water content of the organic solution is equal or less than 5% by weight.
EFFECT: process will enable less energy input and becomes less time-consuming and less costly, as compared to the known processes using water to purify the organic solution.
10 cl, 3 tbl, 12 ex
SUBSTANCE: method involves preparation of a solution of initial components and addition of extra components to the said solution while stirring. The initial components used are glycerin, polyethylene glycol and distilled water and are stirred for 1 hour at 55°C. During addition of extra components, the following are successively added to the solution of initial components: acetates of aliphatic amines while stirring for 12 hours, benzotriazole while stirring for 12 hours, sodium benzoate while stirring for 5 hours, triethanolamine while stirring for 2 hours and proxanol while stirring for 3 hours. The extra components are added while stirring at 55°C and the following nominal ratio of components is maintained (wt %): glycerin 37.20, distilled water 32.64, polyethylene glycol 23.10, triethanolamine 4.00, sodium benzoate 1.50, benzotriazole 1.30, acetates of aliphatic amines 0.25, proxanol 0.01.
EFFECT: wider field of use, obtaining hydraulic fluid for use as actuating medium in hydraulic systems.
FIELD: oil and gas industry.
SUBSTANCE: composition contains di-sodium salt of ethylene-diamin-tetra-acetic acid, sodium hydroxide, ethylene glycol and water at following ratio of components, wt %: di-sodium salt of ethylen-diamin-tetra-acetic acid 9-15, sodium hydroxide 2-6, ethylene glycol 20-40 and water the rest.
EFFECT: composition possesses upgraded dissolving capacity relative to non-organic sediments of complex composition with inclusions of sulphide and iron oxide in them in wide range; also there is facilitated increased capacity of dissolving, high lubricant ability and added capacity to retain ions of iron in dissolved condition.
3 tbl, 1 ex
SUBSTANCE: bottles are crushed to particle size ranging from 0.001 to 5 mm, mixed with calcium chloride in mass ratio bottle : CaCl2 equal to 20:1.
EFFECT: obtaining new material.
1 cl, 2 tbl
FIELD: oil-and-gas production.
SUBSTANCE: group of inventions related to material and method for collection of oil, lube, masut, fuel and hydrocarbons form water, soil, and other surfaces, also for cleaning of contaminated with oil and oil-products waters The material consists of swelling in oil and/or oil-products rubber and dispersing mineral filler with opened internal hydrophobic porosity.
EFFECT: efficiency increase and economically more profitable in terms of material consumption and method itself due to oil bonding speed increase and decrease of resin volume in the material.
3 cl, 2 ex, 4 tbl
FIELD: oil and gas production.
SUBSTANCE: reagent contains fraction obtained in processing of liquid products from oil feedstock pyrolysis via rectification of these products within a temperature range of 28 to 150°C at atmospheric pressure and in presence of polymerization inhibitors; and optionally polyalkylbenzene resin in amount 0.5-5.0% separately or in mixture with α-olefin 2.0-8.0%), or with anionic surfactant (0.05-0.2%). Reagent may also further contain 0.5-5.0% α-olefins and 4.0-10.0% butylbenzene fraction. Method of treating well bottom zone comprises injecting hydrocarbon fluid containing above-indicated hydrocarbons, forcing it into formation with buffer liquid, holding it in bottom zone for a wale, and drawing off dissolution products.
EFFECT: enhanced dissolution of asphaltene-tar-paraffin deposits on oil-field equipment and in well bottom zone and prevented re-precipitation of asphaltenes.
EFFECT: 5 cl, 3 tbl