WO2018156036A1

WO2018156036A1 - A sealing composition for tires

Info

Publication number: WO2018156036A1
Application number: PCT/PL2017/000014
Authority: WO
Inventors: Wieslaw Hreczuch; Darota DOMARECKA; Arkadiusz Chrusciel; Dominik Gschwender
Original assignee: Aircom Automotive Sp. Z.O.O. Sp. K.
Priority date: 2017-02-23
Filing date: 2017-02-23
Publication date: 2018-08-30

Abstract

The invention relates to a sealing composition for automobile tires. The composition comprises at least one polyhydric alcohol from a group comprising glycerol, ethylene glycol, propylene glycol, natural latex, water and possibly mineral fillers, as well as amphiphillic block copolymer being a polydispersion mixture of compounds of the general formula (I) and (II), in the amount of 1-5 % by weight, with compounds of type (I) being a polydispersion mixture with the content of individual homologues defined by Poisson distribution or other distribution similar to Poisson distribution, with average content of propylene oxide mer units per 1 mole of 2-ethyihexan-l-ol and variances falling within the range of 1-3 and the average content of ethylene oxide mer units per 1 mole of 2-ethylhexan-l-ol and variances following within the range of 8-13.

Description

A sealing composition for tires

The invention relates to a sealing composition for automobile tires, in particular to be applied to the interior surface of a tire by a compressor without the need to remove the pneumatic valve.

Sealing compositions for automobile tires have a long history and have already been described at the beginning of the previous century (for instance in applications US 1444288 A of 1923 and US 2357650 A of 1944). Technological development has offered new solutions and applications but it has also introduced ever higher quality and environmental requirements.

The primary categories of ingredients of known tire sealing compositions comprise anti-freezing agents including mainly ethylene glycol, propylene glycol or other polyhydric alcohols such as glycerol, polyoxyalkylene glycol, or calcium chloride, fillers such as silica, bentonite, aluminum hydroxide, viscosity modifiers, dispersing agents, surfactants, preservatives , corrosion inhibitors, vegetable oils, crosslinking catalysts, latex, fibers from a group comprising cellulose, glass, carbon and asbestos fibers and many other functional ingredients.

A number of ingredients of known sealing compositions for automobile tires is harmful to health or environment. These include for instance ethylene glycol or carcinogenic asbestos fibers known from applications US4713114A and US4337322A. However safer natural substitutes such as flour and vegetable oils known from US patent application US5059636A, or molasses known from application US7807732A or glycerol known from international patent application PCT/CN2011/080946, or synthetic propylene glycol disclosed in patent application US5364463A have been successfully used in sealing preparations for automobile tires. A frequent functional additive to sealing compositions for tires includes also anti-foaming substances, for instance silicone emulsions disclosed in application US5059636 A.

A group of high-performance sealants with valuable performance properties, known from prior art, includes liquid sealing compositions based on synthetic or natural latex.

American patent application US4294730 (A) discloses compositions for application to the interior surface of the tread of a pneumatic tire to facilitate relative movement between contacting portions of the interior surface when the tire is driven deflated, comprise a polybutene, an acrylic polymer or a polyolefin as a gelling agent for the polybutene, and a particulate solid puncture sealing material. Preferred gelling agents are polyethylenes, especially a mixture of high density and low density polyethylenes. Examples of suitable puncture sealing materials are rubber crumb and wood flour.

Chinese patent application CN103555122 (A) relates to a macromolecuiar self-mending self-sealing hot melting polymeric glue for automobile tires and a preparation method thereof. The self-sealing polymeric glue comprises the following main components in percentage by weight: 30-38% of styrenic thermoplastic elastomer, 40-45% of thermoplastic polymer resin with the relative molecular weight of 200-2000, 5-15% of plasticized softening component, 1-2% of anti-aging antioxidant component, 0-2% of catalyzing promoting component and 0- 8% of filling temperature-resistant component. When the macromolecular self- mending self-sealing hot melting polymeric glue provided by the invention is sprayed on the surface of the inner wall of an automobile tire, a uniform coating with the thickness not less than 3.5mm is formed so as to play roles in leak prevention, puncture prevention and bullet prevention, so that the glue can be used for military vehicles.

From Chinese patent application CN102006987 (A) there is known a tire repair sealing composition having: 30 to 80% natural iatex, 5 to 35% synthetic Iatex, and 10 to 60% ethylene glycol, and wherein the diameter of the synthetic iatex particles advantageously has a mean particle-size distribution of 0.04 to 0.5 [mu]m,

From international patent application WO2016115560 (Al) there is known a high performance sealant for repairing punctures in tires which includes a highly filtered natural rubber Iatex, an ultra-fine inorganic powder, a polyamide suspension, and an antifreeze agent that includes water and at least one of ethylene glycol and propylene glycol. The high performance sealant can readily pass through a valve stem of a tire without removing the core and seal, and provides a strong and durable sealing of the puncture. Indian patent application IN6310DEN2012 (A) relates to an elastomeric composition having a self-sealing property, which is usable, in particular, as an anti- puncture layer in a tire object, and containing at least (a significant percentage of parts by weight percent of a solid elastomer): an unsaturated solid diene elastomer; between 30 and 90 percent of a hydrocarbon resin; 0 to less than 30 percent of a filler; between 0.5 and 15 percent of thiuram polysulfide.

From American patent application US2016032215 (Al) there is known elastomer composition having a self-sealing property which can be used in particular as puncture-resistant layer in an inflatable article, based on at least (phr meaning parts by weight per 100 parts of solid elastomer): a blend of at least two solid elastomers, a polybutadiene or butadiene copolymer elastomer, referred to as "elastomer A", and a natural rubber or synthetic polyisoprene elastomer, referred to as "elastomer B", the elastomer A: elastomer B ratio by weight being within a range from 10: 90 to 90 : 10 between 30 and 90 phr of a hydrocarbon resin; from 0 to less than 30 phr of filler.

Chinese patent application TW201525114 (A) discloses a sealant composition; the sealant composition comprises latex emulsion, nanoporous particles, surfactant, anti-freezing agent, wetting agent, and water. The sealant composition of the present application achieves a good sealing performance for the puncture of the tire. From Japanese patent application J P 2014214313 (A) there is known a color sealant composition with self-sealing performance useful for a tire which includes 10 to 60 pts.wt. of surface modified silica, 0.05 to 5 pts. wt. of pigment, 40 to 100 pts.wt. of polybutene having a number average molecular weight of 1000 to 1500, 60 to 300 pts.wt. of polybutene having a number average molecular weight of 2000 to 3000, and 5 to 15 pts.wt. of peroxide, to 100 pts. wt. of raw rubber.

American patent application US2009272476 (Al) discloses a sealant material composition providing puncture sealing property within the sealant material composition which includes a compound containing a diphenyldisulfide structure therein.

From American patent application US2014138004 {Al} there is known US2014138004 (Al) an elastomer composition having a self-sealing property which includes a blend of at least two solid elastomers, in which "elastomer A" is a polybutadiene or butadiene copolymer eiastomer, in which "eiastomer B is a natural rubber or synthetic polyisoprene eiastomer, and in which an elastomer A: elastomer B weight ratio is within a range from 10: 90 to 90 : 10 with phr meaning parts by weight per 100 parts of solid eiastomer; and from 0 to less than 120 phr of filler, which includes from 0 to less than 30 phr of reinforcing filler. The composition may be used to form a puncture-resistant layer in an inflatable article, such as a tire. The puncture-resistant layer may be used in combination with an airtight layer to form an airtight and puncture-resistant laminate for the inflatable article.

From American patent application US2011165408 (Al) there is known a self- sealing elastomer composition that can in particular be used as puncture-resistant layer in an inflatable article, comprising at least 30 phr of a saturated thermoplastic styrene elastomer, at most 70 phr of an unsaturated thermoplastic styrene elastomer and more than 200 phr of an oil extender. Inflatable article, such as a tire, provided with a puncture-resistant layer comprising, as self-sealing composition, an elastomer composition according to the invention. Advantageously, the puncture-resistant layer is combined with an airtight layer, for example based on butyl rubber, so as to constitute, in the inflatable article, a puncture-resistant airtight laminate.

The disadvantage of latex-based sealing mixtures is their relatively low resistance to coagulation.

Despite commonly added surfactants to stabilize latexes and in particular synthetic latexes at the early stage of their production, the durability of latex compositions over time is not satisfactory in the context of the automotive sector requirements.

An example of a known latex sealing composition, disclosed in European patent application EP1836249 (A4) and characterized in that a surfactant is an anticoagulant agent with HLB>13. The known rubber composition includes a surfactant, propylene glycol and natural rubber, synthetic rubber or a mixture of natural and synthetic rubber. The composition is temperature-resistant down to (-) 35 °C and may be used for instance as a sealant for tires. The invention also describes the method of preparing the composition according to the invention. The method comprises the addition of propylene glycol to the surfactant to produce a mixture with propylene glycol and combining polypropylene glycol mixture with a rubber emulsion. Optionally, a fibrous or a non-fibrous filler, as well as a binder and antioxidant may be added to the polypropylene glycol mixture, before it is mixed with rubber.

The excessive coagulability of latex reduces the stability of the sealing composition over time, stiil the maintenance of limited latex coagulability on walls with high surface energy and electrical charge, as is the case for porous surfaces of damaged rubber tires, is desired.

The coagulability of latex, which is a component of a high-performance sealing composition, is thus the object of optimization.

The sealing composition according to the invention was developed based on the analysis of the phenomenon of latex flocculation and coagulation based on the theory of stability of lyophobic dispersions by Derjaguin, Landau, Vervey, and Overbeek (DLVO), taking into account the structure of latex micelle particle comprising a tangled chain of cis 1,4-polyisoprene surrounded with a spherical layer of phospholipid particles with their hydrophobic part turned to the polyisoprene macromolecule.

In the case of synthetic latex, the macromolecule is an appropriate polymer of synthetic rubber (e.g. polybutadiene, polychloroprene etc.), stabilized with a synthetic surfactant.

According to DLVO theory, coagulation takes place if there is an increase in van der Waals' interaction energy against the energy of electrostatic repulsion of electrical double layers of micelles.

Assuming that potential energy of electrical double layer repulsion is given by equation (1):

Y - ^Άα ¾ _c ^rD

r^R (1) where:

A - constant a - micelle radius ζ - electrokinetic potential (zeta potential}

R - center-to-center distance between micelles, s - surface-to-surface distance between particles r_D - thickness of the electrical double layer, equal to the Debye length, given by equation (2) eRT

2F²I (2) where: ε - dielectric permittivity of the medium R - universal gas constant T - absolute temperature F - Faraday constant

/ - ionic strength of an aqueous solution phase the increase of the potential repulsion energy of micelles may be obtained by increasing the thickness of the electrical double layer and zeta potential with the ionic strength of the solution phase kept low (lack of strong electrolytes).

The effects of surface phenomena known from scientific publications and related to the compatibility of hydrophobic chains or the creation of ordered surface molecular structures of mixed amphiphilic systems [Shah, D.O.: J. Colloid Interface Sci. 37 (1971} 744-752; Shiao, S.Y., , Chabra, V, Patist, A, Free, M.L, Huibers, D.P.T., Gregory, A., Patel, S., Shah, D.O. Adv. Colloid Interface Sci. 74 (1998) 1-29; Chrusciel, A., Hreczuch, W., Dabrowska, K. , Materna, ., Sznajdrowska, A. J. Surf act. Deterg, (2016) DOI : 0.1007/sll743-016-1888-6], were a basis for the inventors to assume that both the thickness and the structure of the electrical double layer of a latex micelle and the value of zeta potential may be modified by introducing to the dispersion system particles with amphiphilic properties which have the capacity to interact strongly with particles of polar and non-polar solvents alike.

The study of the effect of selected substances with dipolar characteristics of the molecular structure showed that selected low-molecular amphiphilic copolymers of ethylene oxide, propylene oxide and 2-ethylhexan-l-ol have properties that make it possible to modify the above-mentioned characteristics.

It has been unexpectedly found that the introduction of a relatively small amount of the compound from the previously mentioned group of copolymers of ethylene oxide, propylene oxide and 2-ethylhexan-l-ol to the sealing composition made it possible to significantly increase the stability of the sealing composition over time, with performance properties maintained and assessed based on sealing performance criteria. Thus it has become possible to moderate the a coagulability of latex-containing sealing compositions in a controlled way.

The essence of the sealing composition according to the invention is based on the use of amphiphilic copolymer of ethylene oxide, propylene oxide and 2- ethylhexan-l-ol as a surfactant, and its interaction with other ingredients of the said composition which facilitates maximum reduction of the number of ingredients of the sealing composition and at the same time ensures favorable environmental performance and high sealing performance even in extreme temperatures. Thanks to a special branched structure of the copolymer, which is an ingredient of the sealing composition according to the invention, molecules of this compound demonstrate steric specificity which creates a dimensionally-oriented structure on the interfacial surface of suspended particles of latex emulsion, solid particles and the liquid phase of the sealing composition ingredients and on the inner surface of a tire and its space filled with air, and also on the surface of the puncture thus facilitating the penetration of other components of the sealing composition thus increasing its effectiveness, including the effectiveness of sealing the hole where the tire is punctured. Sterically specific amphiphilic structure of the amphiphilic copolymer used also has impact on keeping the suspension homogenous without its quick breaking, preventing coagulation and cross-linking of ingredients of the sealing composition during its storage.

The sterically specific amphiphilic compound, included in the sealing composition according to the invention and acting as a surfactant, constitutes polydispersion mixtures of block copolymers obtained as a result of oxypropylating of 2-ethylhexan-l-ol and the subsequent polyoxyethylenating with 8 to 12 moles of oxirane leading to the production of a mixture of products with polyether properties with the general formula (I):

where and j are natural numbers between 0 -20. Analytical research conducted by the authors of this study shows that the product of the reaction in question may also contain up to 30% by weight of diols of general formula (II),

where: a, b and c, are natural numbers from 0-30 which also demonstrate partial amphiphilic properties. The described structure of molecules and the ingredients of the mixture of products makes it impossible to define their hydrophilic and lipophilic balance and explains specific characteristics and properties different from other amphiphilic compounds known from prior art. The said properties include for instance the lack of gelling, irrespective of concentration in aqueous solutions, and a significantly higher minimum surface of particles adsorbed at the phase boundary. This indicates a different self-organization of the discussed structures in solvent solutions.

The sealing composition for automobile tires according to the invention contains a surfactant, at least one polyhydric alcohol from a group comprising glycerol, ethylene glycol, propylene glycol, natural latex, water and possibly mineral fillers, yet it contains amphiphilic block copolymer which is a po!ydispersion mixture of compounds of general formula (I) and (II), in the amount of 1-5% by weight where compounds of type {1} are a polydisperston mixture with the content of individual homologues defined by Poisson distribution or other distribution similar to Poisson distribution, with average content of mer units of propylene oxide per 1 mole of 2-ethylhexan-l-ol and variances falling in the range from 1-3, and the average content of mer units of ethylene oxide per 1 mole of 2-ethylhexan-l-ol and variances falling in the range from 8-13.

It must be noted that the amphophilic copolymer included in the sealing composition is a polydispersion mixture which contains homologues with a different number of oxyalkylene groups, the amount similar to the content defined by Poisson distribution, the expected value and variance v{3):

where: x„ - mole fraction of an oligomer molecule containing n monomers xo - initial mole fraction of a starter in a reaction mixture v - average degree of oxyethylenating (expected value and variance of distribution) n - number of mers of oxirane in a molecule e - a basis of a natural algorithm in the preferred embodiment, the sealing composition according to the invention may include at least one mineral filler selected from a group comprising bentonite and ground glass.

Also, in the preferred embodiment, the sealing composition according to the invention is a mobile liquid in temperature range from -30 to +70°C.

Preferably, the sealing composition according to the invention is applied to the interior surface of an automobile tire by a compressor without the need to remove the valve.

In the drawing attached:

Fig. 1 shows a schematic structure of !atex micelle, sectional view;

Fig. 2 presents a family of Poisson distribution curves for concentrations of individual oligomers with six different average degrees of oxyalkilenating;

Fig. 3 a) is a schematic structure of a monolayer of a surface film of a known conventional linear surfactant; b) is a schematic structure of a monolayer of a surface film with a sterically specific amphophilic copolymer.

The micelle with rubber latex, shown in fig. 1, is composed of a tangled chain of cis 1,4-polyisoprene surrounded with a spherical layer of phospholipid molecules with their hydrophobic surface turned to the polyisoprene macromolecule; the broken lines indicate an electrical double layer of a latex micelle. The schematic structure of a monolayer of a surface film with a) conventional linear surfactant and b) a sterically specific amphiphilic copolymer, shown in fig. 3, is a general illustration of the effect of a sterically specific structure in the packing in of the adsorption layer of nano-conformates enabling the penetration of other ingredients and/or facilitating desired reactions, for instance the dimensionally-oriented adsorption on interfacial surfaces.

The key function of the amphiphilic copolymer used involving the exceptionally effective and quick action of the sealing composition according to the invention also involves a proper foaming of the sealing composition when applied which facilitates even dispersion of ingredients of the composition according to the invention on the interior surface of a tire while using a minimum amount thereof. At the same time, the exceptionally low stability of the foam produced results in immediate wetting and maximum contact of the sealing agent with the surface it is supposed to act on.

The applied sterically specific amphiphilic copolymer also plays a crucial role in the removal of remains of the sealing composition from the interior surface of a tire in the case of its repair/vulcanization and further use. Attempts to use linear surfactants known from prior art as a substitute such as oxyethylated fatty alcohols have failed or the results were moderate in a limited scope of functions played as compared to the sterically specific amphiphilic copolymer used in the sealing composition according to the invention. The negative results obtained involved latex coagulation and a lack of possibility to dose the emulsion to a tire or its excessive stability which did not have the sealing effect.

The observed exceptional compatibility of the said amphiphilic copolymer with other ingredients of the sealing composition according to the invention is justified by the branched sterically specific structure of the hydrophobic part facilitating penetration and adsorption of other ingredients building in the surface structures of dimensionaily-oriented copolymer particles contrary to tightly-packed structures of oxyethylates of typical fatty alcohols.

It has been unexpectedly found that the use of sterically specific amphiphilic copolymer, which constitutes a product of the oxypropylating and oxyethyienating of 2-ethylhexan-l-ol being a polydyspersion mixture of compounds type (I) and (II) as an ingredient of the sealing composition according to the invention made it possible to obtain an exceptionally high-performing sealing composition for automobile tires with a minimum input of other functional ingredients known from prior art, that lower the freezing point, modify viscosity and have sealing properties which without the contribution of the amphiphilic copolymer according to the invention lost their effectiveness and/or underwent breaking, coagulation cross- linking thus leading to a loss of the expected performance properties of the composition according to the invention.

The sealing composition according to the invention is not classified as a dangerous chemical product in the meaning of principles of Regulation no. 1272/2008 of the European Parliament and of the Council (EC), and is chemically neutral which means that is does not for example cause corrosion of an automobile tire or plastic packaging. The composition according to the invention remains liquid enough to facilitate its automatic application in the temperature range from -30°C to +70°C.

The composition according to the invention shows high sealing performance. The effectiveness of the composition according to the invention was measured using a method based on sealing a puncture made in an inflated tire by means of a standard steel spike with diameter of up to 6 mm causing a drop of overpressure from 2.5 bar to 0.9 bar/min. due to decompression.

If the composition according to the invention is used, the puncture is sealed within up to 10 minutes and remains effective for at least 24 hours and a distance of up to 2000 km and driving speed of up to SO km/h.

Below are the embodiments of the invention.

Exam p le 1.

A mixture of 17% by weight of glycerol, 9% by weight of ethylene glycol, 20% by weight of propylene glycol, 26% by weight of natural latex being a 60% {by weight) water emulsion, 25% by weight of water was prepared, and then while mixing carefully 3% of the reactive mixture obtained by oxypropylating of 1 mol of 2- ethy[hexan-l-ol with 1 mol of propylene oxide was added and then the product obtained was subject to oxyethylenating with 9 moles of oxirane in the presence of zinc hexacyanocobaltate as a dimethyl cyanide catalyst.

The sealing composition according to the invention, being a stable suspension of ingredients, was obtained. When tested, the obtained sealing composition remained a mobile liquid in the temperature range from -30°C to +70°C. Slight breaking occurred during storage at +S0°C but the composition was easily blended by shaking.

During road tests an inflated tire was punctured with a standard steel spike with a diameter of 6mm and was then sealed with the composition according to the invention obtained in example 1, applied in the amount of 450 ml to an automobile tire size 255/55 R18 by means of a compressor without removing the AV valve, the process took 80 seconds. The puncture made was sealed within 4 minutes from the application of the composition to the interior surface of the tire and was effective when driving at 80 km/h.

Exa mp l e 2

A mixture containing 17% by weight of glycerol, 9 % by weight of ethylene glycol, 20 % by weight of propylene glycol, 26 % by weight of natural latex being a 60% water emulsion, 25% by weight of water, was made and then while mixing carefully 5% by weight of the reactive mixture was applied obtained by oxypropylating of 1 mole of 2-ethylhexan-l-o! with 3 moles of propylene oxide and which was then subject to oxyethylenating of the product obtained with 13 moles of oxirane in the presence of NaOH as a catalyst.

The sealing composition according to the invention, being a stable suspension of ingredients, was obtained and applied in the amount of 450 ml to an automobile tire size 255/55 R1S by a compressor without the need to remove the AV valve, the process took 80 seconds. When tested, the obtained sealing composition remained a mobile liquid in the temperature range from -30°C to +70°C. Slight breaking occurred during storage at 80°C but the composition was easily blended by shaking.

During road tests, the puncture in the tire made with a standard steel spike with a diameter of 6mm was effectively sealed.

Example 3

A mixture containing 17% by weight of glycerol, 9 % by weight of ethylene glycol, 20 % by weight of propylene glycol, 26 % by weight of natural latex being a 60% (by weight) water emulsion, 25% by weight of water was made, and then while mixing carefully 1% by weight of the product obtained by oxypropylating of 1 mole of 2- ethylhexan-l-ol with 1 mole of propylene oxide was added and then the product obtained was subject to oxyethylenating with 13 moles of oxirane in the presence of calcium catalyst.

The sealing composition according to the invention, being a stable suspension of ingredients, was obtained and applied in the amount of 450 ml to an automobile tire size 255/55 R18, by a compressor without the need to remove the AV valve, the process took 80 seconds. When tested, the obtained sealing composition remained a mobile liquid in the temperature range from -30°C to +70°C. Slight breaking occurred during storage at 80°C but the composition was easily blended by shaking.

During road tests, the puncture in the tire made with a standard steel spike with a diameter of 6mm causing a drop of overpressure from 2.5 bar to 0.9 bar/mrn. due to decompression, was effectively sealed.

In all examples the puncture was sealed within up to 10 minutes and was effective for at least 24 hours for a distance of up to 2000km and driving speed of up to 80 km/h.

Com parative exa mple 4

A mixture containing 17% by weight of glycerol, 9 % by weight of ethylene glycol, 20 % by weight of propylene glycol, 26 % by weight of natural latex being a 60% (by weight) water emulsion and 28% by weight of water, was made.

A stable suspension of ingredients was obtained and applied in the amount of 450 ml to an automobile tire size 255/55 R18, by a compressor without the need to remove the AV valve, the process took 80 seconds. When tested, the obtained sealing composition remained a mobile liquid in the temperature range from -30°C to +70°C. Slight breaking occurred during storage at 80°C but the composition was easily blended by shaking. During road tests, the puncture in the tire made with a standard steel spike with a diameter of 6mm was not effectively sealed.

Co mpa rative exa mp le 5

A mixture containing 17% by weight of glycerol, 9 % by weight of ethylene glycol, 20 % by weight of propylene glycol, 26 % by weight of natural latex being a 60% (by weight) water emulsion, 25% by weight of water was made and then while mixing carefully 3% by weight of the product obtained by oxyethylenating of alcohols of fraction C12-14 (coconut fraction) with 22 moles of oxirane in the presence of an alkaline catalyst (NaOH).

A stable suspension of ingredients was obtained and 450 ml thereof was applied to an automobile tire size 255/55 R18 by a compressor without the need to remove the AV valve, the process took 80 seconds. When tested, the obtained formulation of the sealant remained a mobile liquid in the temperature range from -30°C to +70°C. During road tests the puncture in the tire made with a standard steel spike with a diameter of 6 mm was not effectively sealed.

Claims

1. The sealing composition for automobile tires comprising a surfactant, at least one polyhydric alcohol from a group comprising glycerol, ethylene glycol, propylene glycol, natural latex, water and possibly mineral fillers characterized in that it contains amphiphillic block copolymer being a polydispersion mixture of compounds of the general formula (1} and (II), in the amount of 1-5 % by weight, with compounds of type (I) being a polydispersion mixture with the content of individual homologues defined by Poisson distribution or other distribution similar to Poisson distribution with average content of propylene oxide mer units per 1 mole of 2-ethylhexan-l-ol and variances falling within the range from 1-3 and the average content of ethylene oxide mer units per 1 mole of 2-ethylhexan-l- ol and variances following within the range of 8-13.

2. The sealing composition according to claim 1, characterized in that it is a mobile liquid in the temperature range from -30 to +70°C.

3. The sealing composition according to claim 1, characterized in that it contains at least one mineral filler selected from a group comprising bentonite and ground glass.

4. The sealing composition according to claim 1, characterized in that it is applied to the inner surface of a tire by a compressor without the need to remove the valve.