MXPA99009148A - Rim with bearing band containing an electrically conductive thread - Google Patents

Abstract

The invention relates to a rubber rim, and its preparation, composed of a rubber carcass reinforced with carbon black with an outer circumferential rubber tread construction, made from a rubber composition having a relatively high electrical resistivity. The tire tread construction has an electrically conductive filament yarn sewn through the tread construction and extending between the inner surface and its outer surface. In this way an electrically conductive path is created through the plain tread

Description

RIM WITH ROLLING BAND CONTAINING A THREAD ELECTRICALLY CONDUCTOR THREAD Field of the invention The present invention relates to a rubber rim, and to its preparation, composed of a rubber housing reinforced with carbon black with a tread pattern construction. Circumferential, external rubber, elaborated from a rubber composition that has a relatively high electrical resistivity. The construction of the tread of the rim has an electrically conductive filament type wire sewn into the tread construction and extending between the inner surface of the tread and its outer surface. An electrically conductive path is created in this way through the tread and the outer surface of the tread towards the rim housing. In practice, the bottom surface of the tread construction is connected to at least one other rubber component reinforced with carbon black from the rim shell in such a way as to provide a relatively electrically conductive path from the outer surface. from the tread of the rim to the rim portion of the rim and, from there, to a metal rim on which the rim is mounted. BACKGROUND OF THE INVENTION Pneumatic rubber tires are conventionally prepared with a rubber tread, which may be a mixture of several rubbers that are typically diene-based elastomers curable with sulfur or sulfur-cured. Sometimes, the rubber tire treads are prepared from a cover / base construction where the outer portion of the tread is the underlying coating and part of the tread between the tread coating and the support rim shell is its base. The covering portion is usually designed to be in contact with the ground and, consequently, has associated properties and the base portion generally covers the rim housing and is customarily designed to support the coating, therefore it is not in contact with the body. floor. Said coating / base constructions are well known to those skilled in the art. The rubber compositions for most of the components of a tire are typically reinforced with a substantial amount of carbon black reinforcement filler filler and therefore have a relatively low electrical resistivity to visit the static electricity towards the road from a moving vehicle that uses said tires. It is believed that said phenomenon is well known to those skilled in the art.

However, it is sometimes desired to provide a tread of a rubber composition containing a substantial amount of a relatively electrically non-conductive reinforcing filler, such as, for example, precipitated silica, and consequently only a small amount of carbon black reinforcement. , optionally, in an amount of, for example less than 20 phr. Said tread band has a relatively high electrical resistivity due to the low level of carbon black and, consequently, has a resistance to the dissipation of the static electricity generated by the vehicle through the rim towards the road. In practice, the relatively high electrical resistivity rubber composition may be the unitary tread, the tread coating and / or the tread base. It is believed that said phenomenon is well known to those skilled in the art. Various methods have been suggested for providing reduced electrical resistance pathways to the outer surface of a tread coating. For example, see US Patent Nos. 1,797,545, 2,267,503 and 2,641,394; and the following patent publications: French patent 1,198,271, 1,251,273, 1,279,913 and 1,564,448; German patent DE 44 17914; Swiss Patent 597,008 and Japanese Patents 57-194,109 and 1-293,208.

Accordingly, for a tire tread construction where a unitary tread composition, or a tread and / or tread base rubber composition has a relatively high electrical resistivity, particularly where it contains only up to about 20 phr of carbon black, it is desirable to provide a suitable path of relatively low electrical resistance from the outer surface of the tread of the rim to the inner surface of the tread of the rim, or in the case of a cover / base type construction rim, towards the inner surface of the tread or tread base covering as the case may be. As used herein, the terms "substantially or quantitatively reinforced with reinforcing fillers that are relatively electrically non-conductive such as, for example, silica" and the like are generally employed in combination with a tire tread, or a tire coating. tread band and / or tread base, in the case of a cover / base type tread construction, containing from about to about 100, sometimes preferably from about 30 to about 90 phr from a filler electrically non-conductive and only a minimal amount, if any, of carbon black where the carbon black is present in no more than about 20 phr. Sometimes, the ratio between non-conductive filler and carbon black can be at least 2/1 and sometimes up to at least 10/1. By the term "reinforced with carbon black", we refer to the fact that the rubber components of the tire carcass rubber that are reinforced with carbon black, contain a quantitative amount of carbon black reinforcement, usually at least 25 phr. , and a minimum amount, if any, of a relatively non-electrically conductive reinforcing filler such as Opor example silica. The weight ratio between the carbon black and said non-conductive filler can be, for example, at least 5/1. In the description of this invention, unitary rubber composition treads and treads of coating / base rubber compositions are presented. Usually, the rubber composition of the tread coating differs from the tread base rubber composition, particularly since the tread coating has the purpose of being in contact with the road and requires a tread composition. rubber with high durability to abrasion. This is understood by an expert in the field. Tread wings are frequently employed in a tread construction that extends to a portion of a rim sidewall and usually over a portion of said rim sidewall. In the description and in the claims of this invention while we do not intend to exclude such treads, the description of a unitary tread rubber composition and cover / base type tread rubber compositions generally focuses on the tread portion other than the tread flanges, it being understood that a tread flange rubber composition may be the same as or different than the composition of the unitary tread rubber or tread rubber composition of rolling type of coating and base. A tread of a tire tread is the portion of the tread that is in contact with the ground when it is used. Said footprint, in relation to the description of this invention, refers to the rim tread, whether the rim is mounted on a rim or on a vehicle under loading conditions. The term "phr" as used there, and in accordance with conventional practice, refers to "parts of a respective material per 100 parts by weight of rubber". In the present description, the words rubber and elastomer are used interchangeably.

In the description of the present invention, the term "vulcanized" or "vulcanizable" can sometimes be used interchangeably with the terms "cured" and "curable". SUMMARY AND PRACTICE OF THE INVENTION In accordance with this invention, there is provided a pneumatic rim composed of a rubber housing reinforced with carbon black, containing two individual side walls, and two portions of spaced eyebrows, and supporting a tread circumferential rubber, peripheral of (a) a unitary rubber composition having a high electrical resistivity or of (b) a coating / base construction, preferably a coextruded coating / base construction, wherein said rubber composition Tread coating and / or tread base is of high electrical resistivity; where the outer surface of the tread, or the tread coating according to the case, is designed to be in contact with the ground, and where said high electrical resistivity of said rubber composition (s) of blindness because the tire has an electrical resistance of at least 20,000 meg-ohms in accordance with the WDK 110 test; characterized in that said tread has a flexible wire in the form of electrically conductive filament sewn through said tread to create an electrically conductive path of the outer surface of the tread designed to be in contact with the ground towards a housing of electrically conductive rim and to thereby form a rim having an electrical resistance within a range of about 1 ohm to about 10,000 mega-ohms in accordance with the WDK 110 test. Accordingly, the above description is for a first characterization of the rim with a tread band that has a high electrical resistivity without an electrically conductive wire sewn through the tread, thus presenting a rim that has a high electrical resistance, and a second characterization of the rim itself that has the electrically conductive wire sewn through the band d e bearing, thus presenting a rim that has a substantially lower electrical resistance. According to this invention, a process for separating a rim is provided in which it comprises sewing a flexible, filament-shaped, electrically conductive yarn through an extruded, unvulcanized rubber tread strip; wherein said tread strip is (a) a unitary rubber composition containing less than 20 phr of carbon black reinforcement or (b) of a coating / base construction wherein the rubber composition of said coating tread or said tread base contains less than 20 phr of carbon black reinforcement; placing these tread strips in a rubber housing reinforced with carbon black to create an assembly and vulcanizing said assembly in a suitable mold at an elevated temperature to form a rim; where said tire has an electrical resistance within a range of about one ohm to about 10,000 mega-ohms in accordance with the WDK 110 test. In a significant aspect of the process of sewing the yarn through the uncured tread the sewing it can be positioned or positioned specifically in a desired location on the tread which can eventually be transformed into a tread rib or a tread block designed to be in contact with the ground. Accordingly, a process is provided where the stitching of the filament is positioned on a tread by staggering the placement of the stitches with a predetermined location of a rim tread rib or rim tread pad designed to be in place. contact with the ground and that are formed as the tire / tread carcass assembly is molded and cured. In practice, said yarn is contemplated as in the form of a plurality of continuous stitches extending circumferentially around the tread to provide at least one stitch in the tread of the tread of the rim intended to be in contact with the ground, where each stitch extends across the tread in such a manner that a segment of each stitch of the thread extends on a portion of the inner surface of said tread and a segment of each stitch of said thread extends in a portion of the outer surface of the tread intended to be in contact with the ground. In the practice of this invention, various stitch configurations can be employed and the stitch method is not limited nor is the stitching created by said stitches not limited to a particular configuration, recognizing that several industrial sewing devices from various manufacturers provide a multiplicity of sewing configurations. For example, the stitches may be of an open loop or closed loop construction, recognizing that several industrial sewing machines can provide a multiplicity of variations of open loop and closed loop stitches configurations. In fact, it is contemplated that an industrial sewing machine can simultaneously apply the threads to the sewing operation where one thread can pass through the eye of a needle of one machine and another thread is fed from a coil on the opposite side of the piece to be sewn. For example, in the case of closed loop stitches, it is contemplated that the stitches may form a series of closed loops of the thread extending substantially circumferentially around the tread of the rim and which may be created, for example, by the Sewing the thread from the inner surface of the unitary tire tread or tread base, as the case may be, on the inner surface of the tire tread construction, where the segments of the thread loop they oppose each other on the outer surface of the tread and on the inner surface of the tread. It is envisaged that sewing with closed loops, for the purpose of this invention, is not limited to said described stitches but may encompass any type of stitch applied by a specific sewing machine employed. In practice, the segments of closed-loop yarn stitches extending on a portion of the outer surface of said tread band intended to be in contact with the ground can be cut, filed or otherwise subjected to abrasion to form a plurality. of sequential open loop yarn stitches connected by their segments on the inner surface of the tread, where at least one end of the yarn of the open loops terminates on the outer surface of the tread intended to be in contact with the yarn. floor. Alternatively, the yarn can be sewn with open loops through the tread construction to create what is sometimes known as a "rectangular wave configuration of the yarn" in the sense that the yarn segments on the outer surface of the yarn The tread band does not directly oppose segments on an inner surface of the tread. Thus, the sewn thread configuration does not have the appearance of closed loops. It is contemplated that open loop stitches, if used, are not limited to this specific example, since various embodiments may be employed according to the sewing method or the contemplated sewing machine. It is considered that, in general terms, a closed-loop and open-loop stitch construction is well known to those skilled in the art, even though there are many complexities in sewing techniques and configurations employed by various sewing machines. industrial As mentioned above, it is not contemplated that the invention is necessarily limited to a specific stitching technique or configuration.

In one aspect of the invention, the segment of a closed loop or open loop of the stitch on the outer surface of the yarn may be cut, filed or abraded in such a way that the ends of the yarn end up on the surface of the band. of bearing. The stitched configuration becomes a series of open loops that are not connected to the outer surface of the tread of the rim. Thus, the yarn of said stitches extends towards the outer surface of the tread construction where the open ends of the yarn loop terminate and are positioned on the outer surface of the tread construction designed to be in contact with the tread. floor. In one aspect of the invention, the relatively insulating rubber composition (with high electrical resistivity) of said tread band may contain from about 30 to about 100 phr of electrically non-conductive (electrically insulating) reinforcing fillers such as, for example, precipitated silica and from zero, or from about 5 phr to about 20 phr of carbon black. In one aspect, it is sometimes preferable that, for the relatively electrically insulating rubber composition of the tire tread, the weight ratio between the silica and the carbon black, if carbon black is used, is present in at least about 1.2 / 1 and preferably at least 10/1. Various materials can be used for the filament type yarn for the stitches of this invention insofar as they have a relatively low electrical resistance. It will be understood that some filament type materials may have greater or lesser physical longevity depending on the type of tire, use and service. For example, filaments of carbon fibers, synthetic textile fibers, including cords made therefrom, (e.g., nylon, aramid, polyester, rayon) that are electrically conductive (i.e., made electrically conductive by the inclusion of an element electrically conductor or electrically conductive material, for example a dispersion within its composition or coating, sheath or sheath of electrically conductive material), ultra high molecular weight polyethylene containing a carbon black dispersion (wherein said polyethylene has an average molecular weight in weight within a range of about 4 million to about 7 million), as well as filament type edges or other electrically conductive materials. This invention is not intended to be limited to the aforementioned exemplary materials, even though, preferably, in most cases, it is desired that the yarn be made of non-metallic fiber even when the material of one or more of the filaments may contain a dispersion of metal in particles. The WDK 110 test is a method for measuring the electrical resistance of a rim mounted on an electrically conductive metal ring (ie, a steel ring). In the test, the tire of the tread of the rim is pressed against an electrically conductive metal plate (ie, a steel plate). The plate and the ring are connected through copper wires to an instrument. A voltage is applied and the electrical resistance between the plate and the ring is read from an ohm-meter on the instrument. A reference to the WDK 110 test can be found in the WDK Leitlinien Index (May 1998). The electrically conductive wires for use in this invention may be formed of a unitary filament (monofilament) or of several individual filaments formed together (twisted). As mentioned above, the yarns can be sewn through the tread construction by various methods and, it is desirable that the treads are mechanically sewn through the use of a suitable automatic machine. While not limited to these, various diene-based elastomers and combinations thereof can be employed in the tire tread construction components (i.e., unitary tire tread, tread layer and tread base). Such diene-based elastomers can include homopolymers and copolymers of conjugated diene hydrocarbons and copolymers of conjugated dienes and aromatic vinyl compounds such as styrene and alpha-methylstyrene. Examples of various dienes are, for example, isoprene and butadiene. Representatives of various elastomers are, for example, cis 1,4-polyisoprene (natural and synthetic), 1,4-polybutadiene cis, styrene / butadiene copolymers, or copolymers prepared by emulsion polymerization and as copolymers prepared by organic solution copolymerization. , isoprene / butadiene copolymers, styrene / isoprene copolymers, 3,4-polyisoprene, relatively high vinyl polybutadiene containing from about 30 to about 85% vinyl and styrene / isoprene / butadiene terpolymers. In practice, the rim can be constructed, in part, by the construction of an extruded tread in a rubber housing. Said construction and training process are well known to those skilled in the art. The rim assembly is vulcanized in a suitable mold under high temperature conditions, for example, in a range of about 140 ° C to about 180 ° C. The electrically conductive wire sewn through at least one of the tire tread components provides a relatively low electrical resistance track, as compared to a tire tread with a relatively high electrical resistance and, consequently, a way for the dissipation of static electricity between the floor and the rim flange portion, and consequently, the metal rim of the wheel of the vehicle where the rim can be mounted. In practice, after the outer surface of the tire tread, as used in service, is worn in such a way that a part of the electrically conductive wire is also at least partially worn, the path for static electricity dissipation is considered here maintained by the exposed portion (s) of residual yarn on the outer surface of the tread coating such that at least a portion of the ends of the yarn can be in contact with the ground. The accompanying drawings are provided for a further understanding of the invention, even though the invention is not intended to be limited to that illustrated in the drawings. It will be understood that the stitches described in the drawings are a very simplified description. As discussed above, industrial sewing machines provide many stitch procedures, as well as methods and configurations resulting from stitched threads. Accordingly, it should be emphasized that the thread configurations stitched in the drawings are presented only for a general understanding and, in practice, the configurations of the stitched yarns may be substantially different. DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view, in cross-section, of a tire tread compound consisting of a tire and a tread base together with an electrically conductive wire sewn through the belt. of bearing. It will be understood that, alternatively, the tread may be a unitary rubber composition instead of a construction consisting of a covering and a base. Figure 2 is a cross-sectional, perspective view of a molded and vulcanized rim with a tread of a rib and groove design of a cover / base construction coupled with an electrically conductive wire sewn into the tread . It will be understood that, alternatively, the tread may be of a unitary rubber composition rather than a shell / base construction. Figures 3 (A), 3 (B) and 3 (C) represent a cross section of a tread taken in section 3 (A) -3 (A) of Figure 1 where Figure 3 (A) represents the electrically conductive wire with an open loop stitchFigure 3 (B) represents the electrically conductive wire with a closed loop, and Figure 3 (C) represents a sewn tread where the thread on the outer surface of the tread has been cut. With reference to the drawings, a cross section of an unvulcanized rubber tread (1) having portions that will become, after the rim construction and when shaping and vulcanizing the rim in a suitable mold, a coating is shown. of tread band (2) having, in the case of this exemplary drawing, a high electrical resistivity, and normally designed to be in contact with the ground, a tread base (3) (unless the tread band tire bearing is of a unitary rubber composition) which is found under the tread band and tread wings (4), or what is known as "inialas", which come out of both the band coating of bearing (2) as the base of tread (3) and splicing a portion of the side wall (5). It will be understood that, alternatively, the tread may not have the mini-rails (4) and that the side wall (5) It may splice a portion of the tread even when, for the purposes of this invention, such construction is not preferred.

An electrically conductive wire (6) is shown sewn through the tread body (1) and, consequently, both through the tread base (3) and through the tread coating ( 2) in order to create an open loop stitch (figure 3 (A)) or a closed loop stitch (figure 3 (B)) or an open loop stitch where the thread on the tread surface external has been cut (figure 3 (C)). It will be noted that Figures 3 (A), 3 (B) and 3 (C) are only for presenting examples and that many variants of stitch configurations may be employed. For the sewn thread (6), a segment of (7) extends on a small portion of the outer surface (8) of the tread coating (2) and a small segment (9) extends over a small portion of the inner surface (10) of the tread base. In one aspect, the outer segment (7) of the closed loop stitched onto the outer surface (8) of the unvulcanized tread intended to be in contact with the ground can be trimmed, or else in the vulcanized tread, by example, it can be filed by a filing or cutting device, (15) in such a way that a series of open, connected, individual loops is formed in which only the ends (11) of the wire (6) extend up to the surface external (8) of the tread (2) as shown in Figure 2. In this way, and for this example, the sewn thread provides a relatively low electrically conductive path of electrical resistivity from the outer surface (8). ) of the tread coating (12) of relatively high electrical resistivity towards the inner surface of the tread base (10). It will be noted that, alternatively, the tread base (3) of a tread pattern / tread base covering construction can perform a function of an electrically non-conductive rubber composition. with a relatively high electrical resistivity. While in figure 1 the minialas (4) are represented as individual rubber components of the tread (1), it will be understood that the minialas (4) can be a unitary extension and the same composition of the tread base (3). It will be noted that the tread coating (2) of Figure 1 is substantially reinforced with relatively non-conductive reinforcing filler, such as, for example, without limitation, silica, viz. For this drawing from about 20 to about 90 phr. of non-conductive reinforcement filler, with only a minor amount of carbon black (ie, approximately 20 phr or less). Thus, the tread coating (2) has a high electrical resistivity and the sewn thread (6) therefore provides a path of reduced electrical resistivity through the tread (1). For the tread construction of this example, all the tread components, namely the tread base (3), the tread coating (2) and the minialas (4), in the General practice can be coextruded together in a multiple extruder to form the tread compound (1). The rim construction is shaped and vulcanized in a suitable mold to form a rim (12) with the sewn thread (6) on the outer surface of a rib (13) of the tread cover (2), with an example of the stitched version illustrated in Figure 2. As discussed above, such stitched configuration is provided only as a example. According to the rim, which has been assembled and inflated in a suitable rigid electrically conductive metal hoop, mounted in turn on a wheel of a vehicle, rolls on the floor, creates a path of electrical dissipation between the ring and the external surface (8) of the rib (13) of the tread coating (12), and therefore the floor, through the aforementioned sewn thread (6) as it comes in contact with the road. It is contemplated that, as the outer surface of the tread coating (2) on the outer surfaces in contact with the tread rib floor (13) wears out, unless it has already been filed or cut as previously discussed , a segment of the yarn (7) on the outer tread surface (8) wears away also thus leaving a portion of the yarn (6), particularly the yarn ends (11) in contact with the road surface. The creation of an electrically conductive path from the outer surface of a relatively non-electrically conductive tread by sewing an electrically conductive wire is considered to be novel and inventive. In practice, the filament or the filaments of the yarn can be modified by varying their diameters and selecting the compositions in order to provide various flexibilities and compatibilities with the rubber compositions as well as various electrical resistivities, according to somehow the compositions of rubber itself and the intended use and service of the same tire tread. A significant novelty is considered here that is the concept of sewing the electrically conductive thread through the tread which does not introduce significant penalties on the extrusion capabilities of the tire tread including modifications to the extruder die, compromises minimum if they exist for tire tread rubber compositions and without complicated additional rim construction steps (the construction of the tread on the rim shell). A further aspect of the novelty of this invention is that it allows for flexibility both in the positioning of the sewn yarn at predetermined specific locations in the tread band as well as a variation of selection and choice of stitch configurations (i.e., open loop, closed loop, cut loop or subject to abrasion) according to whether the stitch may be desired for a particular rim as well as to provide more than a stitch configuration on the same rim band. In practice, while various electrically non-conductive reinforcing fillers may be employed, example of such fillers is silica, even though it will be understood that the practice of the present invention is not limited to silicas as the only suitable electrically non-conductive reinforcing filler. Representative examples of silica fillers, for example, and without limitation, are precipitated silicas.

The use of such silicas in the reinforcement of rubber compositions is well known to those skilled in the art. Representatives of various precipitated silicas are, for example, and without limitation, the silicas available from PPG Industries under the trademark Hi-Sil with designations 210, 243, etc; silicas available from Rhone-Poulenc, for example, Zeosil 1165MP and silicas available from Degussa AG with designations such as for example VN2, VN3, and BV3370GR, and from J. M Huber as Zeopol 8746. When a silica reinforcement is desired, particularly reinforcement Quantitative silica, for a rubber tire tread band, conventionally precipitated silica, particulate, with a coupling agent, or what is sometimes known as a silica coupler, capable of reacting both with the surface is conventionally used of silica as with the rubber elastomer molecule, in such a way that the silica is achieved to have a reinforcing effect on the rubber, many of which are generally known to those skilled in the art as coupling agents, or good couplers. In practice, the rim can be constructed, shaped and cured by various methods that will be readily apparent to those skilled in the art. The invention will be better understood with reference to the following examples, in which parts and percentages are given by weight unless otherwise indicated. Example I This example is presented to illustrate a concept of the present invention. Pneumatic rubber tires identified here as tires A, B and C, are prepared in a type and size 265 / 35R18. All rims have rubber hoods reinforced with identical carbon black with eyebrows and associated side walls. For this example, the tires were of a tread construction on the side wall with the tread itself being of a coextruded shell / base / miniala construction. All treads have the same vulcanized tread pattern or surface configuration, studs and grooves. Particularly and for this example, tires A, B and C have a tread construction composed of the coextrusion of (i) a tread coating (ii) bearing base; where the rubber of the tread coating is quantitatively reinforced with silica and contains a minimum amount of carbon black, and where the tread base is quantitatively reinforced with carbon black. The "A" rim is a control tire with a tread of high electrical resistivity and, therefore, a rim of high electrical resistance but without any stitch of an electrically conductive thread through its tread. The experimental tire "B" has an electrically conductive filament thread sewn through the tread before forming the tread on the rim shell through an open loop stitch, similar to Figure 3 ( TO) . The experimental rim "C" has an electrically conductive filament yarn sewn through the tread before forming the tread on the rim housing through an open loop stitch, similar to Figure 3 ( A) except that the segment of the tread on the outer surface of the tread was trimmed, similarly to that in Figure 3 (C). The yarn had a diameter of approximately 1 millimeter and was composed of a multiplicity of filaments formed in cable of carbon fiber material. All the tires, after vulcanization in a suitable mold, had a tread of a rib and groove configuration. The tires were evaluated to determine their electrical resistance in accordance with the WDK 110 test.

The composition of the tread coating contained the materials illustrated in the following table 1. The base of the tread was composed of natural rubber, 1,4-polybutadiene cis and was reinforced with approximately 50 phr of carbon black. The aforementioned co-extruded landing strips are suitably shaped in the rim housings and the assembly is vulcanized in a rim mold at a temperature of about 160 ° for about 15 minutes to form cured pneumatic rims with rib tread configurations and grooves Table 1 (Tread coating) Tires A, B and C Parts Non-productive stages of mixing E-SBR1 25 Isoprene / butadiene rubber 2 45 1,4-polybutadiene cis3 20 Natural rubber4 10 Processing auxiliaries5 25 Fatty acid 2 Silica7 80 Black smoke, type for tread 0 Coupling agent8 12 Production stage of mixing Sulfur 1 Zinc Oxide 4 Antioxidant (s) 3 Accelerators 4 1) SBR separated by emulsion polymerization obtainable from The Goodyear Tire & Rubber Company with a styrene content of approximately 40%. 2) isoprene / butadiene copolymer elastomers with a glass transition temperature of about -45 ° C and an isoprene content of about 50%, obtained in The Goodyear Tire & Rubber Company. 3) cis 1,4-polybutadiene rubber obtained as BUDENE ® 1207 from The Goodyear Tire & Rubber Company. 4) Natural rubber (1, 4-polyisoprene cis). 5) Oil processing oil comprising approximately 9.4 parts in the E-SBR, where the amount of E-SBR is reported above in a dry weight (without the oil) and in addition, approximately 15 additional parts of processing oil were added of rubber, plasticizers resins and waxes. 6) Of the di-aryl-para-phenylenediamine and dihydro-trimethylquinoline type. 7) A silica obtained as Zeosil 1165MO from Rhone-Poulenc. 8) Obtained as bis- (3-triethoxysilylpropyl tetrasulfide) (50% active) commercially available as X50S from Degussa as a 50/50 mixture of tetrasulfide with carbon black N330 (thus, it is considered 50% active). Measurements of the electrical resistance were carried out on tires A and B, using the WDK 110 test. The results of the tests (average values) are illustrated in the following table 2. Table 2 Electric Resistivity Wheel1 A (control) Greater than 20,000 B (open loop stitch) 0.03 C (open loop stitch and 0.17 Cut) 1) Meg Ohms. These measurements of electrical resistance demonstrate that the application of an electrically conductive wire sewn onto an electrically non-conductive tread can provide a suitable electrical path to significantly reduce the electrical resistance of the rim between the outer surface between the tread and the tire casing. In the practice of this invention, a precipitated silica is used for the electrically non-conductive reinforcing filler. It will be understood that, when said silica is employed in the practice of this invention as a reinforcing filler, it is conventionally employed in combination with a silica coupler.

While some representative embodiments and representative details were presented for the purpose of illustrating the invention, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the claims.

Claims (1)

1. CLAIMS A pneumatic rubber tire characterized in that it is composed of a rubber carcass reinforced with carbon black, which contains two individual side walls, and two spaced eyebrow portions, and which supports a peripheral, circumferential rubber tread of (a ) a unitary rubber composition having a high electrical resistivity or of (b) a coating / base construction; wherein the rubber composition of said tread coating and / or said tread base has a high electrical resistivity; wherein the outer surface of the tread, or of the rolling coating as the case may be, is designed to be in contact with the ground, and where said high electrical resistivity of said rubber composition (s) is evidenced because the rim has an electrical resistance of at least 20,000 meg-ohms according to the WDK 110 test; characterized in that said tread has a flexible, filament-shaped, electrically conductive thread sewn through said tread in order to create an electrically conductive path from the outer surface of the tread to a rim housing electrically conductive and to thereby form a tire having an electrical resistance within the range of about one ohm to about 10,000 mega-ohms according to the test WKD 110. A process for the preparation of a rim, characterized in that it comprises the fact of sewing a flexible thread, in the form of filaments, electrically conductive through an extruded, unvulcanized rubber tread, where said tread is (a) a unitary rubber composition containing less than 20 phr of reinforcement carbon black, or else (b) a coating / base construction where the rubber composition of said coating of tread or said tread base contains less than 20 phr of carbon black reinforcement; constructing said tread in a rubber rim casing reinforced with carbon black to create an assembly and vulcanize said assembly in a suitable mold at an elevated temperature in order to form a rim; wherein said rim has an electrical resistance within a range of about 1 ohm to about 10,000 mega-ohms according to the WDK test 110. The process of claim 2, characterized in that the stitch of the filament is positioned in the tread by the stepping of the placement of the stitches with a predetermined location of a rim tread rib or a tread rim tread designed to be in contact with the ground and formed in accordance with the tire rim / tread housing assembly. Bearing is molded and cured. The pneumatic tire of claim 1, characterized in that the tread is of a unitary rubber composition. A pneumatic tire prepared in accordance with the process of claim 2 or 3, characterized in that the tread is of a unitary rubber composition containing a carbon black reinforcement in an amount of about 5 to about 20 phr. The process of claim 2 or 3, characterized in that the tread is of a cover / base type construction where the tread coating contains a carbon black reinforcement in an amount of about 5 to about 20 phr . A rim characterized in that it is prepared in accordance with the process of claims 2, 3 or 6. A pneumatic rim of claim 1 or 2, characterized in that the tread is of a coating / base construction where the composition of rubber of the tread coating contains a carbon black reinforcement in an amount of 5 to about 20 phr. 9. A pneumatic tire prepared in accordance with the process of claim 2, characterized in that the tread is of a cover / base construction where the rubber composition of the tread coating contains a carbon black reinforcement in an amount of about 5 to about 20 phr. 10. The pneumatic tire of claim 1, or of claim 2, characterized in that the tread is of a coating / base construction where the rubber composition of the tread base contains a carbon black reinforcement. in an amount of 5 to about 20 phr. 11. A pneumatic tire characterized in that it is prepared in accordance with the process of claim 2, wherein the band is of a coating / base type construction where the rubber composition of the tread base contains a carbon black reinforcement in an amount of 5 to about 20 phr. The pneumatic tire of claim 1, characterized in that said yarn has the shape of a plurality of continuous stitches extending circumferentially around the tread in order to offer at least one stitch in a portion of the tread of rim expected to be in contact with the floor; where each stitch extends across the tread in such a manner that one segment of each thread stitch extends on a portion of the inner surface of said tread band and one segment of each thread stitch extends over a portion of the external surface of the tread intended to be in contact with the ground. 13. A pneumatic tire prepared in accordance with the process of claim 2, or claim 3, characterized in that said yarn is in the form of a plurality of continuous stitches extending circumferentially around the tread with the object providing at least one stitch in a portion of the tire tread provided to be in contact with the ground; where each stitch extends through the tread in such a way that one segment of each stitch of the tread extends on a portion of the inner surface of said tread and a segment of each thread stitch extends on a portion of the outer surface of the tread intended to be in contact with the ground. 14. The pneumatic tire of claim 7, characterized in that said yarn is in the form of a plurality of continuous stitches extending circumferentially around the tread in order to offer at least one stitch of a tread of the tread. of rim bearing intended to be in contact with the floor; where each stitch extends across the tread in such a manner that one segment of each thread stitch extends on a portion of the inner surface of said tread band and a segment of each thread stitch extends in a portion of the outer surface of the tread intended to be in contact with the ground. The pneumatic tire of claim 1, characterized in that said segments of said yarn stitch extending a portion of the outer surface of said tread band intended to be in contact with the ground are cut, filed or abraded to forming a plurality of sequential open loop yarn stitches connected through their segments on the inner surface of the tread; where at least one end of the yarn of the open loops ends on the outer surface of the tread intended to be in contact with the floor. A pneumatic tire characterized in that it is prepared in accordance with the process of claim 2 or claim 3, wherein said segments of said yarn stitch extending on a portion of the outer surface of said tread band intended to be in contact with the floor are cut, filed or removed by abrasion in order to form a plurality of sequential open loop yarn stitches connected through their segments on the inner surface of the tread; where at least one end of the yarn of the open loops ends on the outer surface of the tread intended to be in contact with the floor. The pneumatic tire of claim 7, characterized in that said segments of said yarn stitch extending on a portion of the outer surface of said tread band intended to be in contact with the ground are cut, filed or abraded in order to form a plurality of sequential open loop yarn stitches connected through subsegments on the inner surface of the tread; where at least one end of the yarn of the open loops ends on the outer surface of the tread intended to be in contact with the floor. The pneumatic tire of claim 6, characterized in that said stitch is in the form of a closed loop construction. The pneumatic tire of claim 1, characterized in that said yarn is sewn through the tread in the form of a plurality of continuous open loop stitches extending circumferentially around the tread where each stitch extends through the tread in such a manner that a segment of the yarn extends on a portion of the inner surface of said tread and at least a portion of the yarn of each stitch extends to an outer surface, without extending over it, of the tread intended to be in contact with the ground. A rim prepared in accordance with the process of claim 2, or of claim 3, characterized in that said yarn is sewn through the tread in the form of a plurality of continuous open loop stitches extending circumferentially around the tread where each stitch extends across the tread in such a way that a segment of the thread extends on a portion of the inner surface of said tread and at least a portion of the thread of each stitch extends to an external surface, without extending over them, of the tread intended to be in contact with the ground. 21. The rim of claim 1, characterized in that said stitch is in the form of an open loop construction with at least one segment of the thread on a portion of the inner surface of the tread and at least one segment of the thread on one side. portion of the outer surface of the tread intended to be in contact with the ground. 22. A rim prepared according to the process of claim 2 or claim 3, characterized in that said stitch has the shape of an open loop construction with at least one segment of the yarn in a portion of the internal surface of the yarn. tread and at least one segment of the thread on a portion of the outer surface of the tread intended to be in contact with the ground. 23. A pneumatic tire of claim 1, characterized in that said yarn is of a multi-filament construction, of the cable type. 24. A pneumatic tire prepared in accordance with the process of claim 2 or claim 3, characterized in that said yarn is of a multi-filament construction of the cable type. 25. A pneumatic tire of claim 1, characterized in that said yarn is of a monofilament construction. A pneumatic tire prepared in accordance with the process of claim 2 or claim 3, characterized in that said yarn is of a monofilament construction. The pneumatic tire of claim 1, characterized in that said filament type yarn is of a non-metallic fiber composed of at least one of the following: carbon fibers, synthetic textile fibers containing a dispersion of electrically conductive material and / or having a coating, shield or sheath of electrically conductive material, and ultra high molecular wt polyethylene of a wt-average molecular wt within a range of about 4 million to about 7 million containing a carbon black dispersion. A pneumatic tire prepared in accordance with the process of claim 2 or claim 3, characterized in that said yarn in the form of filament is a non-metallic fiber composed of at least one of the following: carbon fibers, synthetic textile fibers electrically conductive including cords thereof, and an ultra-high molecular wt polyethylene of a wt-average molecular wt within a range of about 4 million to about 7 million containing a carbon black dispersion.