MXPA97006990A - Rim with elastome composition bearing surface - Google Patents

Abstract

A pneumatic rubber rim with an outer circumferential bearing surface composed of selected elastomers with spatially defined glass transition temperatures, in combination with defined amounts of aromatic processing oil and reinforcing filler is presented.

Description

RIM WITH COMPOSITION BEARING SURFACE OF STOMEPOS FIELD OF THE INVENTION This invention relates to a pneumatic rubber rim with a bearing surface and an external gate of the selected turbine, reinforcement filler and oil. BACKGROUND OF THE INVENTION Pneumatic rubber tires are conventionally prepared with a rubber bearing surface typically composed of a »ne ~~ r] < a of elastomers, reinforcement fillers, and oil. This invention focuses essentially on rims for passenger vehicles where it is desired that the rubber composition of the rim bearing surface have a good balance between abrasion resistance and hysteresis properties. Rubber compositions designed to specifically emphasize a very good adhesion for a tire bearing surface typically have a relatively low abrasion resistance and relatively limited wear resistance as well as a glass transition temperature (Tg). single, typically relatively high above -50 ° C and generally within a range of from about zero to about -50 ° C and which also has a relatively high content of rubber processing oil such as, for example, from a sludge about 40 to about 1 0 phr. In this attempt, it is necessary to provide ana rubber composition for the bearing surface, a relatively high resistance to abrasion, it is desired to provide such rubber composition for ra. rim bearing surface with materials, essentially known materials, combined together in a new combination. It is recognized that various diene-based elastomers, including individual polymers of isoprene and butadiene as well as isaprene and / or butadiene copolymers together with each other or with mater? Ale = > vinyl aromatics > For example, it has been or is frequently indicated for use in various compositions for tire bearing surfaces. For example, 1, 4-poly cis isoprene - both natural or synthetic, 3,4-pal and isoprene, 1,4-pal cis-ibutadiene, copolymer of is it not / butadiene and isoprene copolymer has been used. / butadiene, or such elastomers have been suggested for use in various combinations in rim bearing surface compositions. Terms such as "compound rubber", "rubber compound" and "compound", if used herein, refer to composite compositions composed of one or several elastomers joined with various ingredients, including curing agents such as for example Sulfur and healing accelerators. The terms "elastomers" and "rubbers" can be used interchangeably here. All of these terms are considered to be well-known by experts in the field. A reference to the transition temperature to glass, or Tg, of an elastomer or an elastomer composition, when mentioned herein, represents the glass transition temperature (s) of the elastomer in question. either of the elastomer composition in its uncured state or possibly in a cured state in the case of an elastomer composition. A Tg can be adequately determined by means of a differential scanning calorimeter (DSC) at a temperature change rate of 1 ßC per my unit. The existence of more than one glass transition temperature of a cured rubber composition can be determined by dynamic mechanical testing and demonstrated, for example, in the form of a graphic or graphical representation of delta tangents, or of low modulus (ie, E ") as a function of temperature The existence of more than one transition temperature to glass for the composition of rubber is evident when at least two jumps, or (jumps), are present in the graph between the temperatures of ~ -9"C and 1 ° C. PRESENTATION AND PRACTICE OF THE INVENTION In accordance with this invention, there is provided a pneumatic rubber rim having a cylindrical rubber bearing surface where said bearing surface is a composition of rubber that nsiste >1, on the basis of 10 parts by weight of the rubber of the bearing surface, (A) elastomers consisting of (i) about 20 to about > 0, alternatively approvetely 25 to approve 4 < "> Stored / butadiene phr is prepared by emulsion or bi polymerization by polymerization in organic solution having a content in the range of about 30 to about 55, alternatively from Approximately 30 to approximately 50 * and a Tg within a range of approximately -15 ° C to approximately -45 ° C, (??) of apra :; 5 to about 40, alternately from about 15 to about 30, vini lpol ibutadiene medium having a vinyl content within a range of approximately 40 to about 65 * and a Tg within a range from about -45 ° C to about -65 ° C, (iii) from about 20 to about 40, to about 20 to about 30 phr of 1,4-polybutane having a transition temperature of about glass within a range of about -95 ° C to approximately -105 ° C and IV) from about 5 to about 30, alternately from about 10 to about 30 phr of 1, -pol ii or cis reindeer having a glass transition temperature within a range of approximately -65 ° C and roundabout -70 ° C, (F1) of approximately 60 to about 110, preferably of about or>. 5 Approximately 90 phr of a carbon black reinforcement filler with high structure characterized because it has an iodine adsorption value of greater than 10, preferably greater than 115 and alternatively within a range of approximately 11 to approximately 135 g / lg together with a DBP number greater than 110, preferably greater than 115 and alternatively within a range from approximately 325 to approximately 140 cm3 / 100g and (or approximately 2 to approximately 30, preferably within a range of approximately 5 to approximately 25 phr of an aromatic processing oil having an aromaticity content of at least 35, and preferably within a range of approximately 35 to approximately 50 * 4 in accordance with ASTM D2140, where the glass transition temperature of the elastomer with the glass transition temperature plus ba is at least 50 * C lower than the glass transition temperature of the elastomer with the temperature transition to the highest vid io ra. It is an important aspect of the present invention that the glass transition temperature of the elastomer with the glass transition temperature plus ba, is deci, the rubber of 1, - polybuta i is not, is at least 50 ° C lower at the glass transition temperature of the elastomer with 1? Higher glass transition temperature, ie, the styrene / butadiene copolymer rubber. Preferably, in one aspect of the invention, a. minus 20, alternately at least 25 * /. by weight of the elastomers have a glass transition temperature of less than -95aC, ie, the 1,4-polybutane cis, and at least 20 * 5 by weight of the elastomers have a higher glass transition temperature at about -45 ° C, ie, the styrene / butadiene copolymer. This difference in a spatially defined glass transition temperature of the individual elastomers of at least 50 * C is considered important and in fact one of the critical aspects of the invention, to provide the rubber composition, is to have a good balance between a relatively low abrasion resistance and a relatively high hysteresis at low temperatures within a range of -35 ° C to O'C for hysteresis. In this way, it is considered here that the relatively low glass transition temperature of the 1,4-poly ibadotenol elastomer is relatively incompatible with the relatively high glass transition temperature of. The elastomer of styrene / butadiene copolymer complies with what is evidenced by its individual tan delta peaks in a graphical, or graphical, representation of tan delta versus rubber composition temperature within a range of temperature of about -90 ° C to about 10 ° C. Parcularly, and as an aspect of this invention, a plot of Tan of a versus the temperature curve within a range of -90 ° C to 10 ° C for 3a The rubber composition of this invention provides two peaks in the curve with a peak having its peak within a temperature range of -90 ° C to -50 ° C and a second peak with its apex within a temperature range of -30. ° to 10 ° C., the evidence of the elastomer incompetencies are the presence of dual peaks of Tan. delta for the elastomer composition cured with sulfur. Tan delta values, with the peaks included in their curves, can be determined by dynamic mechanical testing of the cured compound by procedures well known to those skilled in the art. Accordingly, it is required that the curated composite rubber composition present at least two peaks Tan. Delta ß within the aforementioned temperature range. This is considered significant because, for the cured composite rubber, it is considered here that a combination of the Tan.delta type, at the lower temperature (for example -90 * C to -50 ° C) for the temperature elastomer of ba transition to glass, would suggest a property promotion of improved abrasion resistance (ie, improved resistance to wear in the case of a rim) together with a second peak Tan. delta at the highest temperature (e.g. -30 * C to 10ßC) represented by the elastomer with the highest glass transition temperature, which would suggest a higher hysteresis promotion at temperatures within a range of approximately -30 to approximately O'C ( that is, a higher rolling surface adhesion), which is a pre-ect property of a better balance of such properties, particularly in the case of a rim bearing surface, than a cured rubber composition having Peak peak Tan delta of the aforementioned temperature range of -90"C to 10 * C. A useful cure system for the composition of elastomers is sulfur with a combination of hexameter and lens-thinning accelerators and its 1-fluoride of N-tert-bu and 1-benzothiazole. They were found to provide a good cure for compounds for passenger tire rim surfaces claimed in this invention in a weight ratio between the tetramma based and t &g based accelerators. Enzyme Azole within a range of Approximate 0.6 to Approximate 1.5, It can be seen that additional elements such as secondary accelerators as well as retardants can be used for the system. Curing for the rubber composition For such a vulcanization system, it may be customary to employ between 0.7 and about 2.0 phr of sulfur together with approximately 10 and about 3.5 p> g of l a-, combined accelerators. In practice, the styrene / buta i epo copolymer elastomer containing a solid or styrene content is considered here as important to increase the adhesion of the rim bearing surface, hysteresis or coefficient of friction, for the rubber composition, it is desired here that the reinforcement content is at least 30% to increase the adhesion of the bearing surface of the rim.Preferably, for such purposes, the copolymer or of reinforcement / butadiene is prepared by polymerization in emulsion. The use of the v i elastomer or Ipol ibutadi not medium specific is here considered important to provide a good balance between the abrasion resistance and the hi t re is for the rubber composition. It is desired that the content in a loop is within a range of 40 to 65%. The use of the elastomer of 1, 4-polybutane in particular is considered important here to increase the resistance to abrasion. The use of 1, -pul i i = > Specified cis op, preferably natural rubber,:. > Here, it is considered important to increase the processing capacity of the compound with the lower amount of processing oil and processing additives that are considered here that adversely affect abrasion resistance. The addition of the natural rubber 1, 4 ~ poly isoprene cis is also considered here as an important factor in contributing to the property and wear resistance for the rubber composition for the bearing surface. The use of carbon black (s) to reinforce the c-Aucho, in this invention, with the range of iodine adsorption values characterized and the range of the DBP number is considered here as a supporting factor to provide a good abrasion resistance, or coefficient of friction, as well as an increased or relatively high hysteresis for a relatively good adhesion for a rim bearing surface. Examples of carbon blacks for reinforcing the rubber are NI 21 and N20. All of these carbon blacks represent an iodine adsorption index within a range of approximately 110 to approximately 145 ky and a DBP number within a range of approximately 110 to approximately 140 cm3 / g. of carbon black reinforcement for elastomers, generally, together with its iodine index values and DBP absorption values of dibutyl phthalate, can be found in The Vanderbilt Rubber Handbool, (Vanderbilt Rubber Handbook) (1990), 13ava. edition, pages 416-419. The use of the specified aromatic rubber processing oil is considered here as an important factor in providing a processibility of rubber and hysteresis for adhesion. A typical characteristic of such an aromatic rubber processing oil is for example a flavor content of at least 35 * /. with the rest of the primary oil being a combination of paraffinic and naphthenic content. An aromatic oil with an aromatic content of at least about 35% and a range of about 35 to about 50 * /. is contemplated. Consequently, even though the aromatic content may be lower than most, even though at least 35% is present, it is still known as an aromatic oil. Typically, for rubber forming purposes, rubber processing oils can be divided into three categories, ie, paraff oils (ruches containing less than 20% aromaticity which may be the most common naphthenic oils containing less than 20%). % aromatics and aromatic oils containing at least 40% aromaticity of conformity with ASTM D 2140. Frequently the paric, naphthenic and aromatic oils are a mixture of the three oils.Therefore, while it is required here that the oil of If the processing contains the aromatic component, the rest of the oil is typically composed of paraffinic and naphthenic components.

Also, an oil known as process oil of raffinate rubber may also contain naphthenic and / or aromatic components, and a processing oil known herein as naphthenic or paraffinic / naphthenic oil may also contain naphthenic and / or aromatic components. also contain an aromatic component, even though it is expected that the aromatic content will be less than 30% and probably less than 20%. All these oils are well known to those skilled in the art of the composition of rubbers. For this invention, the aromatic rubber processing oil with the relatively high aromatic content is required instead of the paraffinic rubber processing oil or the naphthenic rubber chalking oil with its lower romatic content cJebi or at its best compliant with the reclaimed rubber composition and, more specifically, the styrene / butadiene copoly elastomer, the high temperature elastomer component of transition to the rubber composition. In the practice of this invention, the use of specific combinations of the aforementioned elastomer mixture and rubber additives and curing agents are considered important here to optimize strength. abrasion (res isi eneja .1 wear) and hiresis (ie adhesion). In fact, it is considered here that the use of the elastomers is combined and in combination with a relatively low aromatic oil content for surface. of rim bearing for passengers provides a mixture of incompatible elastomers in accordance with what is defined by a composition of elastomers cured with sulfur that has the two tan delta pikes, is significant, is considered novel and is believed to be an advance in relating to the use of typical elastomer blends with a cured elastomer composition with a Tan. delta peak within a temperature range from approximately -90 ° C to approximately i ° C, using defined elastomers having glass transition temperatures spaced at least 50'C. In the further practice of this invention, while maintaining the aforementioned basic inert elastomer composition, it is proposed here that the composition of -fc. Rubber for the bearing surface can contain very much in quantities of:? 5 to approximately 15 phr of at least one synthetic elastomer based on di no additional. Such additional synthetic diene-based elastomers may, for example, be 1, 4-polybutadiene tranb with a glass transition temperature within a range of approximately 70 ° C to about 85 ° C. In practice, it is preferred that the elastomers used in the composition of bearing surfaces, including both the other elastomer and the additional elastomers, exclude polymers and capolymers of silicone, including modifications thereto. As presented herein, the invention is based on the use of known elastomers, carbon blacks, and rubber processing oils in what is called = * here as a novel combination for the purpose of (i) selecting individual materials specific, and fu) combine the specific materials selected in novel combinations in terms of individual quantities in a manner that is not believed to have been specifically used above for a tire bearing surface. This aspect of the invention is considered particularly important for creating a rubber composition for rim bearing surfaces and bearing good abrasion properties together with good adhesion properties, either coefficient of friction or bi n hysteresis. This aspect of the invention focuses specifically on - > A more precisely defined approach that is discussed in its most precise form as follows: "While it is considered that a rim bearing surface rubber is conveniently reinforced with a reinforcing grinder of particle carbon neyro, it is recognized that, for some applications of tires, one may also wish on a silica reinforcement. In this case, from about 5 phr to approximately 30 phr of silica can be used insofar as the weight ratio between carbon black and silica is at least about 1. Siliceous pigments commonly stamped in rubber composition applications they are usually precipitated siliceous pigments (known here as silica). The siliceous pigments used may be precipitated silicas, for example those obtained by the acidification of a soluble silicate, for example sodium silicate. The av = >The TSE surface of the silica, according to the measurement using nitrogen gas, can for example be within d > = < a range from approximately 300 to approximately 200 square meters per gram. A BET method for surface area measurement is described in the Journal of the American Chemical Society, vol. O, p. 304 (1930). The silica can also have an absorption value of dibutyltin (DBP) within a range of about 100 to about 400, and usually about 150 to about 300. The silica can be expected to have a average size of final particles, for example, detritus of?.? \ Approximately 0.01 to 0.05 microns in accordance with what is determined by the electron microscope, even when the particles, of silica can be even lower in terms of its size. Vapa = silicas commercially available for use in this invention can be considered as, for example, only to titers, "for example and without limitation, silicas commercially available in PPG Industries, under the third trademark Hi-Sil with those of ignations 210, 243 , silicas available in Rhone-Poulen, with designations of Zeosil 1165MP and silicas available in Degussa AG with ignations VN2 and U 3, etc. When a silica reinforcement is used for the rolling surface of rubber tires, the Silica is conventionally employed with a coupling agent, or what is sometimes referred to as a reinforcing agent, compounds capable of binding both with the silica surface and with the 3-molecule of the silica. or erosion of rubber to cause the silica to have a reinforcing effect on rubber, many of the particles are usually bonded by the components of the coupling agents, or coupling are often used. Such coupling agents, for example, can be premixed, either pre-reacted with the silica particles or added to the rubber seal during the processing of the product or in the stage. If the coupling agent and silica are added separately to the rubber mixture during the rubber / silica mixture, or bi n at the processing stage, the coupling agent is considered to be combined In situ with the silica, particularly, such coupling agents can, for example, be composed of a ring having a constituent component, or a portion (the silane portion) capable of reacting with the silica surface, and likewise, a constituent component or portion, capable of reacting with rubber, especially a vulcanizable rubber with sulfur containing carbon-carbon double bonds, or unsaturation, in this way, the coupler then acts as a connecting bridge. between the síli and rubber and therefore increases the rubber reinforcement aspect of the rubber. In one aspect, the licking agent of the coupling agent apparently forms an ion bond to the silica surface, possibly by hydrolysis, and the rubber-reactive component of the coupling agent is combined with the rubber itself. Numerous coupling agents are taught for use in the combination of silica with rubber such as, for example, silicone coupling agents containing a polysulfide component, or structuring with, for example, b1 - (3 - 1 ri et * _> xii 1 i I r op i 1) tetra your 1 furo). It is easily understood by those skilled in the art that the rubber compositions in the rolling surface are made with conventionally compounded ingredients including the aforementioned reinforcing fillers such as carbon black, as defined above, possibly mediated -3 the addition of a minor compound of precipitated silica, in combination with a silica coupling agent., as well as an idegradant (s), processing oil as defined above, stearic acid, or a zinc stearate, or an inc, material (s) that contributes ín) sulfur as well as ac the vulcanizer (s) tion of conf igitivity with the previously defi ned. Such rubber composition is well known to those skilled in the art. The grinding media are typically of the amine or phenolic type. While stearic acid is typically known as an ingredient in rubber composition, it can be emphasized that the ingredient itself is obtained and used habitually as a mixture of organic acids and organic compounds. with at least one of oleic acid, linoleukic acid and palmiolic acid and / or palmitic acid normally contained in the latter, as is commonly used. The mixture may contain minor amounts (up to approximately 6% by weight) of myristic acid, arachidonic acid and / or A i or arachidonic acid. Such a material or mixture is conventionally known in the art of the composition of rubbers as stearic acid. When amounts or ranges of normal or typical rubber composition amounts of such additives are employed, they are not otherwise considered as part of the invention. For example, some of the ingredients can be classified, in one aspect, as processing aids. Such processing aids may be, for example, waxes, such as, for example, microcrystalline waxes and paraffins typically employed within a range of * ().

Approximately 1-5 phr and often within a range of approximately 1 to approx. 3 phr-; and resins, usually as a linkage such as synthetic hydrocarbon and natural resins typically employed within a range of ap or imam 1-5 phr and often within a range of approximately 1 to approximately 3 phr. A curing actuator can be classified as a combination of sulfur and accelerator s) of cure of zu f re for the. composed of 'rubber (hat) i tually simply known as > zsl ar dor) or a sulfur donor / accelerator. In a sulfur and accelerator (s) of curing, the amount of sulfur drawn is within a range of approximately 0.5 to about 5 phr and usually within a range of about 0.5 to about 3 phr the accelerator (e) ), often of the sulphonic type, is used within a range of about 0.5 to about 3 phr and frequently within a range of about 1 to about 2 phr. However, the preferred system for curing sulfur and accelerators has already been defined arrib. The ingredients, including pear elastomers excluding the sulfur and accelerator curing agents, are usually first mixed together in the series of at least two mixing stages, even though a mixing step may sometimes be employed, at a temperature inside the mixing stage. of the ratio of approximately 145 ° C to approximately 180 ° C, and such mixing steps are typically known as non-productive mixing steps. Then, the sulfur and the accelerators, and possibly one or more retardants and one to several anti-degradants are mixed at a temperature of approximately 90 ° C to approximately 12 ° "*" C and that is typically known as a stage of productive mixing. The mixing process is well known to those skilled in the art. After mixing, the composite rubber can be manufactured as such, for example, by extrusion through a suitable die to form a rim bearing surface. The rim bearing surface is then typically integrated into a sulfur-curable rim and the assembly is cured in a suitable mold under high temperature and pressure conditions, by methods well known to those skilled in the art. In the case of retreading of the bearing surface of a rim, the bearing surface of the rim must first be pre-cured and then applied to the already cured rim shell with a rubber band curable between the bearing surface and the housing and the rim. The assembly is then subjected to curing conditions to cure the aforementioned rubber band.

The invention will be better understood with reference to the following example wherein the parts and percentages are by weight unless otherwise indicated. EXAMPLE I Mixtures of diene rubber compositions were prepared according to the repairs shown in Table 1 as experiments A, R, C and D. Experiment A is considered a control experiment and experiments B, C and D use mixtures of styrene rubber / bt? T ~ di ene with high styrene content, polybutadiene of vi or medium, cis 1,4-polybutadiene as well as natural rubber elastomers together with black Specific carbon and aromatic oil and accelerators. TABLE 1 Parts Material Exp A Exp B Exp C Exp D Control elastomer (1) of styrene / 96.25 butadiene polybutadiene vinyl 34.38 34.38 34.38 medium (2) 1, 4-po3 ibutadiene cis (3) 37.50 1, 4-polybutadiene ci (4) 25 25 E- SBPI5) (40% BS) 27.50 E-SBR (6) (36% BS) 27.50 E-SBR (7) (52% BS) 20 Natural rubber (8) 30 30 30 Carbon black (9), N205 70 Carbon black, NI 21 (10) 70 70 70 Processing oil 10 5 5 5 (aromatic) (1 Sulfur 1.5 1.0 1.0 1.0 Accelerators (12) 1.5 Accelerators (13) 1.8 1.8 1.8 Conventional amounts were used, preferred, of ant idegradante (s) (of type for feni lend ia ina), ream de li a, fatty acid, or x cicio de i c, pepti zador. The aromatic processing oil mentioned in the following notes was composed of an approximately 40% rom content, a paraffin content of approximately 36% and a naphthenic content of approximately 24%. The total aromatic oil (oil contained in the elastomers diluted in oil and additional oil added to the rubber composition) was approximately 44, 22, 22 and 14 phr, respectively, for the A (control), B , C and D. 1. A styrene / butadiene copolymer elastomer prepared by emulsion polymerization having an emulsion content. Is it approximately 23.5% and at a transition temperature to glass of approximately ~ -52 ° C obtained from The Goodyear Tire? Rubber1 Company, oil diluted with 37.5 phr of a and of rubber processing rom. 2. An Amero of poly butadiene of vi or medium that has a content of approximately 45% of viule 1.2 and a glass transition temperature of approximately -55"C obtained in the form of B dene (r) 1255, oil diluted with 37 phr of aromatic rubber proc ess oil, in The Goodyear T e >; Rubber Company. The rubber had a large Mooney viscosity index (ML-4) of approximately 50. 3. An elastomer of 1, 4-μol and butad i non-cis has a content of 1.4 cis at 0 and a glass transition temperature of approximately -100'C, obtained as Budene (mr) 1254 at The Goodyear Tire &; Rubber Company (oil diluted with 20 phr of aromatic rubber processing oil). 4. A high cis iron blade, Budene (mr> 1207 which has a glass transition temperature of approximately -100 ° C and which is obtained from The Goodyear Tire Z> Rubber Company.) 5. A co-polymer copolymer elastomer. reinforcement / butadiene polymerization emulsion emulsion (E-SBB), containing 40% bound styrene (BS) and having a glass transition temperature of approximately -35'C obtained in The Goodyear Tire Z> Rubber Company (oil diluted with 37.5 phr of aromatic rubber processing oil.) 6. Cobalt elastomer (polystyrene butadiene / polymer emulsion emulsion, ESE-SBR), which contains 36% of the product. Reinforced rubber (BS) and having a glass transition temperature of approximately -40 ° C, obtained in The Goodyear Tire% Rubber Company (oil diluted with 37.5 phr of aromatic rubber processing oil) 7. Copolymer elastomer Polystyrene / butadiene plate of pol im p zac i orr by emulsion (E - SBP) , that i ran 52% of bound styrene (BD) and that it has a glass transition temperature of approximately ~ 25 ° C, obtained in The Goodyear Tire% > Rubber Company. 8. A natural rubber 1, -pal i i sop reno cis, technical grade, which has a glass transition temperature within a range of approximately -65 ° C to approximately -7 * C. 9. A carbon black N205 (ASTM designation) having an air purity index of 122 with a DBP value of approximately 115. 10. A carbon black NI 21 having an index of iodine approximately 121, and a carbon black. DBP value of Approximately-1 13. "11. An aromatic processing oil having an aromatic content in accordance with ASTM D2140 of approximately 40% with the rest of the oil made up of naphthenic and naphthenic content. 12. Accelerators with a weight ratio of 4 to X between sulphenamide of Nc c 3 ohe., I 1 -2-benzoylol (CBS) and tetramethyl thiuram disulfide (TMTD >, respectively.) 13. Accelerators with a weight ratio from 0.95 to 1 between hexame and amine lens and sulfenamide of -tert-but and i 1-2-benzothiazole (TBBS), respectively F.TEMPLO II The prepared rubber compositions were cur-, at a temperature of approximately 150 °. C for approximately 18 minutes and the resulting cured rubber samples were evaluated to determine their physical properties (reported numbers are reported here) as shown in the following Table 2. Samples A, B, C and D of rubber composition correspond to the experimental samples A, B, C and D of Example I. TABLE 2 Properties Ex A Ex B Ex C Ex D Abrasion control according to DIN 78 49 43 51 (loss in cm3) bounce (%) at 23 ° C (Zwicl-) 32 34 36 bounce (%) at 100 ° C) (Zwic) 51 49 49 51 Lengthening Ult. (%) 31 534 528 533 Module at 30%; MPa 6.2 9.2 8..9 8.8 Resistance to tension, MPa 1 177..44 17.3 16. 6 17.0 Hardness, PT 60 67 67 64 «Fc. The observation of the previous physical properties of the c-tueho compounds shows an improvement i nifi ti a as regards the resistance to Id abrasion according to DIN (a minor loss of rubber) for B, C, D compared to A. This is considered here as meaning because it indicates or at least suggests the wear resistance of the tires (minor wear of the bearing surface). The E,, C, and DL models also have a significantly higher module and a higher ratio compared to what makes better handling and grip on UAN wheel curves or the use of composite materials. Rubber ions had bearing surfaces. The rebound values at 23'C indicate a similar adhesion and 3 rebound values at 100 ° C indicate a similar rolling resistance for all rubber compositions, ie experiment A (cont ol), experiment B, experiment C and e.pep ment D, when used as rim bearing surfaces. Reaméo data (150 ° C) for samples A, B, C, and D appear here in the following Table 3. TABLE 3"O Prop e ages E¡ AE, BE, C Ex D Control Time for an elevation 6.7 7.7 7.2 7.7 of a point (minutes) 8.3 10.9 10.8 1 .7 T25 (i ñutos) • 1 T - * "* 17.9 17.8 16.5 T9 ( minutes) 2. 28.6 28 29.2 p of torc ón of 1 ta í N-m) The data generated by the rheometer indicate that the experiential curing system 3 of the two accelerators provides an adequate degree of cure for a rubber composition for rim bearing surface, ie, a T90 less than 20. minutes, and an acceptable safety cont'd to fire 'time pa to an increase of one point to 7 minutes and a torque of delta torque greater than 25). The Tan. Delta versus temperature values for the sulfur cured rubber compositions (ex A and ex B) appear in the accompanying drawing. In the attached drawing, the Tan. Delta urva for 13 Ex. Rubber composition. A (control) appears repressed * by the line of stroke int r umpi o and shows an apex of a single peak to approximately -4? ßC; while the Tan. Delta curve for the rubber composition of Ex B is represented by the solid line and shows two distinct peaks with their apices at approximately -18 ° C. and approximately -60 ° C., respectively. The presence of the two peaks of Tan. Delta indicates the incompibility of the aforementioned elastomer in the composition of i 3uch ~ > , The peak Tan. Delt ~ t at the lower temperature ~ ~ 60 ° C) indicates a resistance re-1! It was greatly improved to abrasion and the second peak Tan. Delta in the upper temperature (-18 * 0 ind to a relatively high mylesis to the rubber composition.) While some of the three modalities and modalities were presented. For the purpose of illustrating the invention, it will be apparent to those skilled in the art that numerous changes and modifications can be made without departing from the spirit or scope of the invention.

Claims (5)

1. CLAIMS 1. nd pneumatic rubber rim having a rubber bearing surface where said surface .d bearing is a rubber composition characterized because it comes, in b a 1 OO for r e e-. ert rubber weight of the bearing surface, (A) shaped elastomers pior (i) of approx. mutely 25 approximately 6/0 ph * of a styrene / bai copolymer elastomer not having a styrene content within the urt range d? - > Approximately 30 to approximately 55% and a glass transition temperature within a range of approximately -15 ° C to approximately -4 ° C, from approximately 5 to approximately 40 ph " A polyimage of vi or the medium having a urine content within a range of approximately 40 to about 5% and a glass transition temperature within a range of about -45 ° C to about -65ßC, iiii) Approximately 2 to about 40 phr of 1, cis-cis-ibutadiene cis a temperature transition to glass within a range of approximately -95 ** C to about -105ßC and (iv) approx. 5 to about 30 phr of cis-1,4-pol ii soprene having a glass transition temperature within a range of about -65 ° and about -70 ° C, > 'B) of about 60 to about 110 phr of carbon black reinforcement filler dropped by a iodine adsorption value within a range of approximately 116 to approve 345 together with an index of DBP within a range of apiro, nately 35%) and 140%), and approximately 2 to approximately 30 phr of an aromatic processing oil that emits an aromatic content of at least 35%.; where the transition to glass transition? said elas! ome or 1, -po3 ibn adi no cis is at least 50 ° C pi r below 'l. glass transition temperature of said styrene / butadiene elastomer elastomer. 2. The rim of claim 1, characterized in that the curing system for said rolling surface composition is from approximately 0.7 to approximately 2.0 phr of sulfur and from approximately 1.0 to approximately 3.5. The combination of accelerators for the curing of hexa and the lens and sulfenamide of N-tert-bu-1-2-benzoyl in a weight ratio between one accelerator and the other and approximately 0.90 to approximately 1.5, respectively. 3. A pneumatic rubber rim having a cylindrical rubber bearing surface characterized in that said bearing surface is a rubber composition formed by, based on 300 parts by weight of the rubber on the rolling surface, (A ) elastomers formed by (i) from approximately 5 to api'o: i ately 4 < J phr of a copying elastomer! The first part of this booklet is prepared by means of a pipelining system, which has a content in the range of approximately 35 to 50% of the total volume. and a transitional transition period of approximately one year - 15 * C to apiro, one year -45"* C, i) and approximately 15 to approve : imadamente 3 '"* phr of a pol ibutadi eno dt? medium vinyl that has a content in vi or within an apiro range: immedi- ately 40 to approximately 65. and a glass transition temperature within a range of approximately -45 ° C to approx. 65 ° C, (iii) from about 20 to approximately 30 phr of 1,4-polybutadiene cis having a glass transition temperature within an approximatively -95 ° C to about -105 ° C range and < v) Approximately 10 to about 30 phr of cis 1,4-poly isoprene having a glass transition temperature within a range of approximately -6 ° C to about -70 ° C. (B) Approximately 65 to about 90 phr of the carbon black reinforcement reactor characterized in that it has an iodine adsorption value within a range from approximately 110 to approximately 145 g / l- 9 together with an index of DBP within a range of approximately 110 to approximately 140 cm3 / 100g(C) of ap oxytely 5 to approximately 30 phr of an aromatic processing oil having an aromatic content of at least about 35/5, and (D) a curing system that comprises suitably .7 a ap or imadamente
2. 2.0 phr of sulfur and of next amen e \ ß (-_, approximately
3. 3.5 of accel- ers- of compound healing by a co-cinna- ion of he, -amet i lentet ra ina and su 1 f in -nnuia letter t-but i 1 -2-benzot j azcjl ert a piroporc in de 1? accelerators within a range of approximately 0.9 to approximately 1.5, respectively- where-1 the glass transition tempera- said cis 1,4-poly ibutadiene elastomer is at least 50 ° C lower than the temperature of >; transition to idrio of said elas ~ > copolymer turner of e = t i reindeer / butadiene; and where a graph of Tan. Delta versu-, the rva of temperature within a range t- -9 'C to 10 ° C for the rubber composition provides two peaks in the curve with a peak having its apex within a temperature r-ango of -90 ° C to -5 ° C and a second peak that has its apex within a temperature range of -30 ° C to 10 ° C.
4. 4. The pneumatic tire of the reactor 1 and any of the preceding claims characterized in that said styrene / butadiene copolymer elastomer is an elastomer prepared by emulsion polymerization and said aromatic oil has an aromatic content within a range of about 35 to about 501-5, where the rest of the oil consists of a paraffinic and naphthenic content in accordance with? STM D2140; and where a graph of Tan. Delta versu-s the curve of temperatures within a range of -90 ° to ß piara the canch composition pro- duce two peaks in the curve with a pi or ti ti ne its apex within a range of temperatures from -90 ° C to -50 ** C and a second peak which has a minimum concentration of 30 ° C to 10 ° C.
5. 5. rim rim 11 > . of the rei indication 1, and of any of the above-mentioned third indications 3-3 ca ter because said elastomer of copolymer of reinforcement / bu ai is not an elastomer propagated by poly erization in organic solution and said The aromatic oil has an aromatic content within a range of about 30%, approximately 5 * 5, where the rest of the oil is conformed to paraffinic and naphthenic content in accordance with ASTM D2140"and where one and Tannic acid. Delta versus temperature curve within a range of -90ßC to 10ßC for the rubber composition provides two peaks in the curve with a peak having its apex within a temperature range of -9GßC to -50 °C and a second peak that has its apex within a range of temperatures from -30 ° C to 10 ° C. FIGSM? IN DG THE IMMEDI- TION p lays a 3-lane neuter- tic gauge with a surface area of r_lj nl o t_ i n- unf erenc 113 e: terna co pueats dr- el a -3 t RANGE = "»? lean incountry "> transitional to VJ.J? IO e = .pa? - ía 1 defini? a., in combination with defined quantities of oil of μror e- ~ am ? ento om ti oy reí lumberjack CIH.- rofueivu.