MXPA96002673A - Rim which has reinforced rubber bearing band with silica with reinforced rubber envelope with car black - Google Patents

Abstract

The invention relates to a rubber tire composed of a rubber frame reinforced with carbon black and having a rubber tread which is quantitatively reinforced with an electrically non-ductile fill pigment, such as, for example, silica and, that, in turn, it is at least partially and, preferably substantially, wrapped by the carbon-reinforced rubber of a consistent or continuous composition. In one aspect, the rubber layer extends through at least a portion of the outer surface of the tread which is normally intended to make contact with the earth and wraps both, the ends and optionally the inner surface of a tread band. Tire bearing, which can be a tread cap of a tire / base tread construction. The rubber layer connects with at least one other carbon component reinforced with carbon black from the rim in a manner to provide a path of reduced electrical resistance from the layer on the outer surface of the tread to the heel portion of the frame. of rim and, therefore, said path of the vehicle to a road surface. In one aspect, it is seen that the tread construction can be a double extrusion of (i) the tread rubber and, (ii) the rubber layer composed of tread flaps and rubber layer extension associated on the external surface of the bearing band

Description

RIM WHICH HAS A BEARING BAND OF i: REINFORCED AUCHO WITH SILI CE WITH REINFORCED RUBBER ENVELOPE WITH CARBON BLACK FIELD This invention relates to a rubber rim with carbon black reinforced frame and a rubber tread compound composed of (i) a tread band containing electrically nonconductive quantitative filler pigment such as, example, silica, reinforcement and a minimum quantity of electrically conductive carbon black, if any, the tread having (ii) an integral rubber layer of consistent, or continuous, composition which at least partially envelops and substantially preferred tread and which is quantitatively reinforced with electrically conductive carbon black. The aforementioned bearing bank construction can be double extrusion of the tread and the layer. In one aspect, the invention also relates to a rubber rim with a frame reinforced with electrically conductive carbon black, vulcanized with sulfur and a vulcanized tread with sulfur of a cap / base-fin construction in which the The tread cap is quantitatively reinforced with electrically non-conductive pigment, such as for example, silica and, with a lower amount of carbon black, if any, and the underlying base and outer fins are one-layer of rubber of varying thickness and of consistent box composition, or continuous that also extends from the fin over at least a portion of the tread which is intended to be in contact with the ground. Said rubber layer connects with at least one other carbon black reinforced component of the rim shell to provide a continuous path of reduced electrical resistance from the outer tread surface to the bead portion of the rim shell. This reduced electrical resistance is compared to the electrical resistance between the reinforced tire tread with silica and the bead portion of the rim frame.

Background Pneumatic rubber tires are conventionally prepared with a rubber tread that can be a mixture of various rubbers that are typically curable with azu¬ - fre or cured with sulfur as the case may be, diene-based elastomers. Rim rubber, including its tread portion, is typically reinforced with carbon black reinforcement filler and with a minimum, if any, of silica. In one aspect, the treads of rubber tires are often prepared from a cap / base construction in which the outer portion of the tread is the cap and the underlying part of the bearing sheaf between the tire and the tire. - pa tread and support rim frame, is - your base. The lid portion is usually designed to make contact with the ground and, thus, have associated properties and the base portion generally overlies the rim frame and is usually designed to support the lid, therefore, so as not to be in contact with the tire. contact with the earth. These lid / base constructions are well known to those experienced in the field. In one aspect of this invention, a cover / base construction tread is contemplated in which, for the purposes of this invention, the tread cap is substantially reinforced with silica, with a minimum amount of carbon black , usually less than about 15 phr of carbon black and, the underlying tread base is substantially reinforced with carbon black. In one aspect, the tire tread, or tread base in the case of a tire / ba * construction, may be presented in a fin spread form on each side of the tread in that the tread flaps extend towards the war and on a portion of the outer surface of the rim sidewall of the rim frame. These tread flaps can sometimes be referred to as "minialetas". In this way, the rim construction, in what refers to the construction of tread, is a construction of tread-on-side wall. It should be noted that the constructions of conventional tread, tread / base cover and tread flap are typically prepared by an extrusion process where, in the case of a de-cap / base-fin construction by For example, the lid, base and fins are extruded - together to form a unified, one-piece extrusion. Said tread extrusion processes are well known to those having experience in that field. However, conventionally in a rim side wall-to-wall construction, the rim flanges are of a rubber composition approximately the rim wall side composition, primarily for compatibility. of side-to-wall tread band. In the practice of this invention, usually, the tread cap is of a composition: ue rubber and, the tread base and the tread fins are * different, individual rubber compositions. In fact, the tread flaps are more conventionally of a rubber composition somewhat similar to the sidewall of the rim frame. The tread cap is typically of a composition designed to make contact with the road and, thus, have proper traction, rolling resistance and tread wear characteristics. The tread base may be of a rubber composition, for example, designed to assist the tire band cap to improve rim bearing strength, but not to be as effective as the belt cap. of bearing by promoting traction and tread wear, because the tread base is not intended to be normally designed to make contact with the road. For the purposes of this presentation, a rim is seen as being composed of a circumferential tread and supporting frame therefor. As discussed above, the tread may be comprised of a tread cap, tread base and, optionally, tread flaps. The frame is seen as being composed of relatively conventional elements which include, but are not limited to rubber side walls reinforced with electrically conductive carbon black (even though a portion of an outer surface of the side walls may be colored by a appropriate pigment, such as, for example, *. white titanium dioxide and, thus, not contain carbon black), heels, apex, inner lining and support frame layers, including fabric-reinforced layers. A rim region of a rim is considered to include a portion of the rim on which its sidewall meets its tread. Normally it is not a sharp line of demarcation and its actual position can vary from rim to rim. The heel portion of the frame is typically comprised of a relatively inextensible bundle of wires that is housed in rubber reinforced with carbon black and is designed to make contact with a metal wheel on which the rim itself is mounted to form a set of rim / wheel that itself is conventionally adapted to be mounted on a vehicle, particularly a wheel of a vehicle. The wheel is typically made of steel or aluminum, or alloy thereof and, thus, is electrically conductive since the metal is considered to have a very low resistance to the flow of electricity. The term "metal", as used herein for the metal wheel, is meant to mean electrically conductive metals, such as, for example, the aforementioned steel and aluminum, as will be understood by those who have experience. in that branch. It is recognized that, in some tire constructions, the components of rubber reinforced with carbon black, such as, for example, components that are sometimes known as astilles or slag can be placed in the bead area or region of the construction of rim to help cushion the bead component against the metal wheel. In the context of this description, a reference to the aforementioned bead component of the rim shell is intended to include said other associated rubber components, unless otherwise indicated, and thus are part of the rim shell. In practice, as is well known to those who have experience in that field, the rim, which can sometimes be referred to as a pneumatic tire, is mounted on the metal wheel and air pressure is applied to the cavity wrapped around it. the metallic wheel and the pneumatic tire frame. The above building elements, or components, of a pneumatic tire and rim frame, as well as said rim / wheel assembly, are also well known to those familiar with the tire industry. It is important to note that rubber n? compound itself is generally considered as being substantially an electrical insulator or, in other words, a rather low conductor of electricity. A vehicular tire made of rubber reinforced with carbon black, while still providing a degree of resistance to the flow of electricity, has a considerably higher electrical conductivity, or resistance less to the flow of electricity, than rubber without the reinforcement of black carbon. It is considered in the foregoing that a relatively low, continuous electric resistance path is created between the electrically conductive metal wheel of a wheel / wheel assembly (crank / wheel) to the surface of the wheel. outer rim band and, from there to the ground through the tire, reinforced with carbon black of the rim, including its tread compound content with the ground, so that said set of 3 lanta / Wheel mounted on a vehicle that is intended to travel over the earth.

In this way, it is considered present that the potential electrical enery, which can potentially be created by the components of or within a moving vehicle such as its rotating wheels and associated rim / tire wheel assemblies as they travel over The ground is discharged from the wheel of 11 arta of a set of 1 lta nta / rim wheel on the vehicle to the earth through the path of rubber reinforced carbon black of the rim frame and tread, or lid of a bearing band of a bearing of a cover / base construction, the tread of which is to be used, as the case may be,- Normally the outer rubber surface of the rim intended to be in contact with the ground. Thus, in one aspect, it is considered here that the rubber reinforced with carbon black of the rim frame and associated tread usually proportional to a sufficiently low electrical resistance path pa¬ * To dissipate the potential electrical energy and, in this way, delay or eliminate the static electric charge that accumulates and / or accumulate under dynamic conditions of a rotating tire in a vehicle traveling through the earth. Alternatively, in practice rubber tires refroced with carbon black can sometimes be prepared by having external rubber treads designed to be in contact with earth that are quantitatively reinforced with silica or other non-electrical electrical fillers. and, in this way, they contain only minimal quantities, such as - for example, 15 phr or less, or sometimes even less than 10 phr, of carbon black. In such a tire-reinforced rim construction with silica, even when the various other rubber components of the rim, namely, the aforementioned total bundle framework, are reinforced quantitatively with carbon black with a minimum amount, if there is, of silica and, in this way, they can have a relatively low electrical resistance, of the order of a megtholium or less, while, the tread reinforced with silica-, itself can have a substantially high electrical resistance of a order of at least 20,000 megho_ mios y. in this way, said tread band creates a degree - of electrical insulating effect between the rim shell and earth. Said tire construction has substantially less tendency to dissipate static electricity from the rim to the ground. and, particularly from the metal wheel of the rim / wheel wheel assembly to the outer surface of the tire rim band and thence to the ground, which can be generated by a dynamic condition of the tire's 3 rd rotation. rim on a moving vehicle. Consequently, a potential for static electricity to increase or increase is considered to be higher for such a tire construction with a silica reinforced tread than for a similar Harta with a tread band reinforced with carbon black. Therefore, it is desirable to provide a suitable trajectory of relatively low electrical resistance between the rim bead portion and the outer belt surface for said rim having a rubber-reinforced rubber tread. quantitative and minimum, if any, carbon black reinforcement. Even though the dissipation of generated electrical energy may not be fully understood, it is believed that, as it relates to a vehicular tire, electricity can be transmitted primarily from the rim wheel of metal, steel or aluminum, by example, from there or through the rubber surface re-enforced with carbon black from the rim shell to the outer surface of a rubber tread reinforced with carbon black and from there to the ground. It is recognized that a thin coating of external rubber, if applied to a tire tread surface, will wear out relatively quickly as you use the rim, weave the lining over the surfaces within the grooves in a band. of tire bearing that - typically has a design or configuration of saliente / rrura. In this way, it is hereby considered that only a very small coating of the lining, except for the thickness of the lining on the walls of the rim tread projections, is in fact available for direct presentation. a, or make contact, with the earth to facilitate a relatively low electrical resistance e rim to the ground - for a rim with tread that is quantitatively reinforced with silica. Therefore, it is considered in the present invention that, in order to be practical, the outer top layer of the tread with the carbon black on the outer surface of the silica reinforced rubber tread should be a layer of rubber containing thin carbon black, integral with the tread band and, in this way, having good adhesion to the bearing center, particularly within the tread segments of the rim, impacting the projection walls, and having a sufficient cross-sectional thickness, or surface area, to the ground of the upper-outer cap layer on the rim slab walls to be effective after said layer wears away the outer surface of the tread lugs or bearing. In an alternative aspect, for a tire tread conventionally configured with a combination of grooves and grooves, it is desired that the grooves be connected directly or indirectly to the rubber shoulder refo rm with carbon black of the rim, Ares the rim where they find the side wall and the tread band, so that the strain - of external lid sprung with carbon black is more fully connected with the portion of rubber screened with carbon black of the rim , ad G f, the rim frame and including the tread base er! the case of a tread / base cap construction. In a tire-base / fin-base bearing cap construction, which is well known to those having experience in that field and, for the purposes of this invention, it is intended that the cap be substantially reinforced with silica with. a minimum amount of carbon black and its carbon and carbon blacks are substantially reinforced with carbon black. In practice, it is desirable that the outer top layer of outer tread, fins and base of the rock band be used. If it does, (i) contain a quantitative amount of carbon black and have a relatively low electrical resistance to assist in the dissipation of electrical energy under the conditions mentioned above, (ii) and be co-vulcanized with the tread. of rubber rim so that they are integral with the tread and the walls of grooves of a ^ w configuration of tire tread compound composed of grooves and grooves. It is expected that the outer cap rubber composition will wear away from the outer surface of the rim tread shoulders during the use of the rim, so that the cross-section, or thickness, of the cap layer e_x terna On the projecting walls, be sure to present a relatively low electrical drag path of 3rd round * of bearing to the ground. As used herein, the terms "quantitatively reinforced with silica", "quantitative silica reinforced rubber" and the like are generally used in conjunction - with a tire tread and, with a tire tread cap of rubber, in a tread cap / base construction containing from about 30 to about 100, preferably from about 30 to about 90 phr, of silica and which may also contain optional * Black carbon mind where carbon black is present - at no more than about 20 phr. It is often preferred that the ratio of silica to carbon black be at least 2/1 and sometimes at least 10/1. By the term reinforced with "carbon black", it is implied that the rubber components of the rim frame rubber which 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 silica and the weight ratio of carbon black to silica is at least 5/1. While it is recognized that most carbon blacks are electrically conductive to some degree, and most carbon blacks make most rubber compositions electrically conductive or, to a lesser extent if they contain enough of the carbon black, some carbon blacks are more electrically conductive than others. For convenience herein, the term "electrically conductive carbon black" is intended to mean a chalked black because it has a BET surface area of at least 30 g / cm. The BET surface area of carbon black is a well known technique for characterizing said surface area by a method of nitrogen absorption. The term "consistent or continuous rubber composition" when used herein is intended to mean that the rubber composition is basically of the same rubber composition through designated rubber components. In particular, it is intended in the practice of this invention that the mini tread plates and the outer tread cap layer be of the same rubber composition and be of a unitary composition or component or construction, or continuous . In this way, in one sense, the outer tread cap layer is simply an extension of the mj_ ? $ * nialetas of bearing band. In another aspect of the invention it is intended that the tread minialetas, the layer - of external lid of tread and the base of roda_miento, when the base of tread is used, are of the same composition of rubber and are of unitary construction. By the term "unitary construction" it is intended that all the components of said tire tread band be joined together in a single unitary construction.

The term "phr" as used herein and, in accordance with conventional practice, refers to "parts of a respective material per 100 parts by weight of rubber". In the description herein, rubber and elastomer are used interchangeably.

In this invention, a pneumatic tire is provided which is composed of a refocused rubber frame with carbon black having two individual side walls and, two spaced bead portions and a circumferential rubber tread band composed of a tread band and a pair of spaced tread fins, each individually placed in adjacency and extending axially outward from opposite sides of the tread to overlap at least a portion of the outer surface of each of the two sidewall portions of the rim frame, wherein the tread is comprised of a laminate of vulcanizable rubber with double extruded sulfur-composed of (i) a tread, and (ii) tread-fins with an outer tread cap - upper outer layer extending from each of the tread flaps and integral with and covering at least a portion of the outer surface of the tread designed to be in contact with the ground; wherein the roving band contains from about 30 to about 100 phr of precipitated silica and, optionally, up to about 20 phr of carbon black; and wherein the tread flaps and the outer tread cap layer are of a unitary rubber composition and contain about 25 to about 100 phr of carbon black having a BET value at an epiphyseal level. about 30 to about 1000 / g. The rim is vulcanized whereby the upper tread cap is co-vulcanized and integral with the tread and tread fins and where the tread has a protrusion and ranch configuration. The rim can be properly characterized in that the rim without the top tread cap layer has an electrical resistance greater than 20,000 meters and the rim - with the top tread cap has a -electrical resistance of less than 100. These are in accordance with a load-bearing electrical resistance test which, for convenience, is given herein as Test GT-L and which is described further below, and wherein the top tread cap layer in The walls of the projections have a thickness on a scale of about 0.01 to about 0.5 mm. In one aspect of the invention, the integral top tread cap layer can circumferentially cover the peripheral outer surface of each guide of the outer tread surface to be in contact with the ground and covers from about 20 to approximately 100 percent - of the total outer surface of the tread, including the walls of the tread ridges within the tread grooves. In further accordance with this invention, said continuous rubber layer encompassing substantially continuous, constituent, or continuous, unitary is of variable thickness and is composed of (i) an optional underlying ridge cap base having a thickness on a scale of about 0.1 mm to about 2 m, (ii) two miniatures, each individually placed adjacent to the outside of the tread cap and optional tread base and (iii) a top cap layer external having a thickness on a scale of about 0.1 mm to about 0.5 mm extending from the min-fins over at least a portion of the outer surface of the rolled-up band cover intended to make contact with the ground, where the miniatures make contact with the wall of the rim frame; wherein the tread cap contains about 30 to about 100 phr of precipitated silica and, optionally, about 20 phr of carbon black; and wherein the rubber layer contains about 25 to about 100, preferably about 35 to about 90 phr of carbon black having a BET value on a scale of about 30 to about 1000 mVg In additional practice the invention, there is provided a method for preparing a rim composed of a set of vulcanized rim of (A) a frame of vulcanizable rubber with sulfur, reinforced with carbon black having two-sided individual walls and two spaced bead portions and (B) a tread structure of vulcanizable rubber with sulfur, intended to make contact with the earth, placed circumferentially about and integral with the outer circumferential surface of the frame; wherein the bearing-band structure is composed of a tread and a pair of spaced-apart tread fins, each flap being individually located adjacent to and extending axially outward from opposite sides of the tread band to overlap when less a portion of the outer surface of one of the two sidewall portions of the rim shell., comprising the steps of (i) doubly extruding a vulcanizable vulcanizable rubber tire tread band construction composite comprised of (a) the tread rubber composition portion and (b) the tread composition portions. tread rubber with a cap layer - outer top tread band extending from each of the tread portion and covering at least a portion of the outer surface of the tread band Bearing intended to make contact with the earth; in -where the portions of the roll band flap and the top tread cap layer are of a rubberized composition; wherein the rolling band comprises from about 30 to about 100 phr of precipitated silica and / or non-conductive reinforcing fillers and, optionally, up to about 20 phr of carbon black; and wherein the tread flaps and the outer top tread cap are of a unitary rubber composition and contain from about 25 to about 100 phr of carbon black having a BET value on a scale of about 30 to approximately- * • mind 1000 / g; (ii) applying the double-extruded rim band structure circumferentially towards and around the circumferential outer surface of the frame to form the rim coring thereof; and 9 i i) vulcanizing with sulfur the rim assembly in a modified mold under warm conditions. elevated height to form a vulcanized rim. Said method is also provided in which the tread structure is a cap / base construction of a portion of a roll band cap and a base portion of a roll band in which the tread cap - is the composition of rubber band; where the rolling band base lies below the rolling band cover and extends to and into contact with the rolling fins where the tread structure method is prepared by double extrusion (i) the portion of tread cap rubber composition and (ii) the tread-tread fins, the outer top tread cap layer on its extension of the fins and the composition portions of the tread. tread base rubber, wherein the tread fins, the outer top tread cap layer and the tread base - is of a unitary rubber composition that substantially envelops the portion of the tread. tread cap. Said method is further provided in which the tread base is of a rubber composition differing from the unitary rubber composition of the trim band flaps and the extended top tread layer, wherein the tread base portion is tri-extruded with the tread cap and the tread band flap and the upper tread layer portions to form the tread tire construction before preparing and vulcanizing the rim assembly. Said method is also provided in which the tread base is of a rubber composition that differs from the unitary rubber composition of the tread flaps and the extended upper tread layer, wherein the Base tread portion is laminated to the double extruded tread cap and the tread-fins and the upper tread layer passages to form the tread construction before preparing and vulcanizing the rim assembly.

In one aspect, it is sometimes preferable that, for the tire tread cap, the weight ratio of silica to carbon black, if carbon black is used, is at least about 2/1 and, preferably at least 10/1 .. Said rim is vulcanized whereby the rubber layer is covulcanized and integral with the tread cap and, wherein the tread has a protrusion and groove configuration. In one aspect of the invention, even when the rubber layer substantially encompasses the tread, said rubber layer can cover up to thirty percent of the outer surface of the tread cap intended to make contact with the ground, even if desired, said rubber layer may cover approximately 100 percent of the outer surface of the tread intended to be in contact with the earth. * In one aspect of the invention, the tread construction is a double extrusion of (i) the tread rubber and, (ii) the tread flaps and the outer tread layer. Said rim is vulcanized, whereby the rubber layer is covulcanized and integral with the tread cap and wherein the tread cap has a protrusion and groove configuration.

It is important to note that the rim construction of this invention is not based on the electrically conductive strip of rubber embedded within the tread itself, but instead is based on an extension of the tread minialetas in a rim construction with a tread pattern on the side wall. The reference tread components, ie, the tread, tread cap, tread base and miniature strips are well-known tread components by those experienced in said façade m ia. It is hereby considered to be novel that the tread, minialettes and the outer rubber layer on at least a portion of the outer surface of the tread cap is of a consistent, or continuous composition, particularly when taken that the tread has a minimum amount of carbon black reinforcement and the rubber layer has a quantitative amount of carbon black reinforcement. By the terms "coextrusion" and "coextruded" it is !;; it implies that the rubber components are extruded through the same die and are not simply extruded separately and then joined together. In the practice of this invention, the tread sheets are formed by coextrusion at a temperature on a scale of about 80 ° C to about 150 ° C, more preferably about 100 ° C to about 140 ° C. The hot coextrusion of the tread components is particularly beneficial in creating an otherwise intact laminate structure not otherwise obtainable. In general, the coextrusion of the tread cap, tread base and tread flaps (on occasions called minialetas) are well known to those experienced in the field. The upper outer tread cap layer typically has a vulcanized thickness on the outer surface of the tread on a scale of about 0.01 to about 0.5 mm, particularly as being on the walls of the protrusions of the tread strip. bearing of a typical construction and design of projection and groove. While it is understood that said thickness will be expected to vary between the layer in the walls of the projections and the bottom of the grooves, the average thickness is significant as noted above. The outer top tread layer is considered to be integral with the tread in one direction that is both coextruded and covulcanized with the tread. In this way, the outer top layer of outer tread is not a simple laminate formed by coating a relatively cold tread with a solvent-based rubber composition or by applying a relatively cold pre-extruded rubber strip to a tread of rim - relatively cold, particulamente at temperatures of less than approximately 5QC and covulcanizing the whole. Having the aforementioned rubber layer covering partially or substantially of consistent composition to be formed by coextrusion with the tread cap in the cap / base construction of the rolling bath, it is considered herein to be a vnetaja considerable about applying a solvent-based rubber coating on the tread cap or forming a co-extrusion of the individually variable tread components because (i) the adhesion of the components of the laminate is considered in the present which is better since they are created to form the extruded laminating in its hot, unvulcanized state, (ii) a better covulcanization is considered in the present to occur and, (iii) a possibility of contamination is reduced or eliminated. exposed surface. Electrically conductive carbon blacks, apro¬ The compounds contemplated for use in this invention are carbon blacks having a sufficient surface area demonstrated by a BET value on a scale of about 30 to about 2,000 m / g. It is recognized that the majority of blacks are electrically conductive to a certain degree and that some are more electrically conductive than others. The BET method is used herein to indicate those carbon blacks that are believed to be more electrically conductive. It is recognized that most carbon blacks typically used for tire tread reinforcement purposes have BET values that fall within this range. The BET surface area values and the method of determining carbon blacks are well known to those with experience in the field. In practice, the tread of said rim has a protrusion and groove configuration. By the term "covulcanized" it is meant that the coextruded tread components are co-contoured together with the rubber rim frame. Such covulca- nization is well known to those who have experience in the material. The resulting rim assembly is configured and cured with sulfur in a suitable mold to form a cannulated tire. Although not limited thereto, various vulcanizable elastomers with sulfur and combinations of * the same in the construction of different elements of the rim. The contemplated elastomers include homopolymers and copolymers of conjugated diene hydrocarbons and copolymers of conjugated dienes and aromatic vinyl compounds such as, for example, styrene and alphamethylstyrene. The representatives of various dienes are, for example, isoprene and butadiene. Examples of various elastomers are, for example, cis-1,4-polyisoprene (natural and synthetic), cis-1,4-polybutadiene, styrene / butadiene copolymers as copolymers prepared by emulsion polymerization and as copolymers prepared by polymerization of organic solution, isoprene / butadiene copolymers, styrene / isoprene copolymers, 3,4-poly isoprene, relatively high vinyl polybutadiene containing about 30 to about 85 percent content of vinyl and styrene / isoprene / butadiene terpolymers. the rim is then constructed by erecting a coextruded tread to a rubber rim frame, said - Construction and erection procedure are well known by those who have experience in the field. The rim assembly is vulcanized in an appropriate mold under high temperature conditions, for example, on a scale of about 140 C to about 180 QC. The substantially encompassing rubber layer, reinforced with carbon black, co-vulcanized provides a relatively low electrical resistance path, as compared to - a tire tread reinforced with silica and, thus, a path for electricity dissipation static between the ground and the rim heel portion and from there - to the metal wheel rim of the vehicle wheel on which the rim can be mounted. After the tire tread, to be. vice, it is worn so that the outer top layer of rubber tread is weathered from the outer surface of the projections of a tire tread band having a protrusion and groove configuration, the trajectory for static electricity dissipation is maintained by the outer top layer of outer tread on the walls of the tread projections of a protrusion / groove configuration. The accompanying drawings are provided to further enter the invention, even though the invention is not intended to be limited to the presentation of the drawings. In the drawings: Figure 1 is a cross-sectional view of rubber band strips curable with sulfur, non vulcanized, reinforced with silica, extruded, showing a cap / base-fin construction, in combination with the rubber layer of consistent composition that is quantitatively reinforced - with carbon black, is an extension of the base tread band and substantially covers the tread cap.

? While a tread cap / base construction is illustrated in Figure 1 as well as in the following Figures, it is important to note that the tread band may be simply a tread band without the tread band base. to Figures 1B and 1B show the tread base which is of a rubber composition different from the tread cap and tread flaps which may be (1) triextruded with the tread cap, fins and outer roll cap layer as in Figure 1A, or may be (2) applied by separate lamination to the aforementioned construction of double extruded tread-as in Figure 1B. Figure 2 illustrates a perspective view, in cross-section, of a rim with a tread of cap / base construction and containing the substantially coextruded, unvulcanized, covering rubber layer, positioned as a set thereof. the rim shell. Figure 3 is a cross-sectional view of a portion of a rim shaped and vulcanized in its bearing-band region, showing the construction of the rim-cap / base-fin rim band with the rubber layer it covers substantially co-extruded associated, wherein the raised portions of the tread and the recessed groove configuration are illustrated. Figure 4 is a perspective, cross-sectional view of a shaped and vulcanized lant showing the tread cap / base-fin construction, with the substantially co-extruded rubber layer, together with the slatted configuration and tread groove. Figure 5 is similar to Figure 4, except that it illustrates a portion of the aforementioned outer rubber layer that is worn away from the outer surface of the tread projections. Referring to the drawings, a cross-section of unvulcanized, co-extruded rubber treads (Figure 1) is shown having portions to be converted, after the rim is constructed and the configuration and vulcanization of the ridge in an appropriate mold, in the tread cap 7, normally intended to make contact with the earth, and a rubber layer comprising substantially of consistent, unitary and continuous rubber composition as the band of tread that supports the band of rolling, the treads 8 of connecting and extending the tread band as a thin layer 9 on at least a portion of the outer surface of the tread cap that is intended to be in contact with - the earth. For Figure 1, between the portions of the extrusion - which will be converted into the tread cap 7 and the two fins 8 adjacent to the tread cap 7 and the tread band 10 is the outer layer 9 of thin, double extruded rubber outer rubber layer containing a cumulative amount of carbon black and a minimum amount, if any, of silica. While Figure 1 illustrates the minicalls 8 as being an extension of the base 10, it should be understood that the tread base-10 may be of a rubber composition different from that of the tread flaps 8 if the The tread base is formed by a triextrusion or if it is laminated to the double extrusion, as described above, even though all the mini-wheels 8 and the tread-base 10 are quantitatively reinforced rubber composition. mind with carbon black. The aforementioned tread fins, or miniature strips 8, are conventionally a structural part of, or - minialets for a tread cap / base construction are considered herein to be well known to those experienced in the art. the branch that construction and manufacture of tires. All tread components, to say, the tread base, tread cap, outer integral top cap and the minialetas, in general practice, extruded together in a multiplex extruder to form the tread strip construction. An important aspect of the invention is the use of a double extrusion to form the tread construction which preferably can be composed of only two rubber compositions. This double extrusion to form the said (i) tread and - (ii) tread flaps and associated extension thereof of the thin layer on the outer tread surface is believed to be novel and inventiveness, particularly when the tread itself is quantitatively reinforced with silica and the aforementioned tread flaps and the associated thin rubber extension on the outer surface of the tread is quantitatively reinforced with black of coal. In practice, the optional rubber tread base 10 is reinforced quantitatively with carbon black, as are the minialetas and the rubber band cover 7, is quantitatively reinforced with silica and the upper part 9 of double extruded external rubber is quantitatively reinforced with carbon black. A significant novelty is considered in the present - that is that the composite rubber layer of the tread flaps, mini-rails and the outer tread layer, and optionally the tread base, are of a rubber composition quantitatively with identical, unitary, consistent carbon black. It is recognized that said rubber layer is of a varial thickness to accommodate the thickness and requirements of the contour of the mini-plates and the outer tread layer and the optional rolling-bed base. In one aspect of the invention, as illustrated in Figures 3, 4, 5 and 6, the double extruded e.x. tread layer portion of the rubber layer may only partially cover the band cover 7 of the rubber layer. bearing, say, extending, for example, the tread flaps to a location around 20 to about 80 percent of the distance from the inner edge of the tread flap to - the line central tire tread band. The tire construction, as illustrated in Figure 3 with the double extruded tread band constructed towards the rim shell, is configured and vulcanized in a mold suitable for forming a rim as illustrated in Figures 4 and 5 which they have a tread pattern configured with what is presently denoted as projections 14 and grooves 15. The double-extruded tread layer 9 of the substantially encompassing rubber layer, which is co-vulcanized with the rim , it is shown as the aspect of the invention covering the external surface and the walls of the projections 14 and the bottoms of the grooves 15 as an extension of the rubber reinforced with black of cajrón of the minialetas 8 that now remains on a part of the rim side wall 21 placed in the shoulder region of the rim where the tread and the 12-side walls are joined. As the rim, having been assembled and inflated on an appropriate electrically conductive rigid rim wheel, itself mounted on a wheel of a vehicle, rolls through the earth, a path is created for electrical dissipation - between the wheel of the lanta to the tread and, thus, the earth, by the electrically conductive top cap layer as it makes contact with at least one other rubber component reinforced with carbon black from the rim. As the outer top cap 9 on the outer ground contact surfaces of the tread lugs 14 wears out to present a portion 18 of the underlying tread cap 7, an electrical path between the earth and the shoulder of the rim is maintained by the external cover 9 on the walls of the tread projections 15, which in themselves make contact with the earth and, furthermore, through the groove path of connection that extends to a_r mazón reinforced with carbon black of the rim. It is important to note that the invention, as illustrated by the aforementioned drawings, is presented without an electrically conductive element, or strip, such as for example a rubber composition quantitatively reinforced with carbon black, placed entirely within the band of bearing reinforced with silica, including between the tread and fins of tread band and, extending from the outer surface of said tread band to a portion quantitatively reinforced with carbon black of the tread frame or tread base to thereby create an electric resistance path reduced. In practice, the silicious pigments commonly used in rubber composition applications are preferably precipitated silicious pigments (referred to in the pre-I * as silica). The silicious pigments preferably used in this invention are precipitated silicas such as, for example, those obtained by the acidification of a soluble silicate, e.g., sodium silicate. The silicon pigment (silica) must, for example, have a final particle size on a scale of 50 to 10,000 angstrom, preferably between 50 and 400 angstrom. The BET surface area of the pigment, a measurement using nitrogen gas, * is preferably from the scale of about 50 to about 300, preferably from about 120 to about 200 square meters per gram. The BET method for measuring surface area is described in the Journal of the American Chemical Society Volume 60, page 304 (1930), although instruments are now provided by one or more manufacturers that more conveniently provide absorption surface area measurements. of nitrogen that approximate the most bothersome or involved and detailed BET measurement described in the aforementioned literature reference. The silica also typically has an absorption value of dibutyl fatalate (DBP) on a scale of about 100 to about 400 and, usually on a scale of about 150 to about 300. The silica could be expected to have a couple size. Average final film, for example, on a scale of about r ^ H ^ 0.01 to 0.05 microns, as determined by an electron microscope, even though the silica particles may be even smaller in size. Various commercially available silicas may be considered for use in this invention, such as, for example, only and without limitation, commercially available silicas from PPG Industries under the trademark Hi-Sil with designations 210, 243, etc .; available silicas of Rhone-Poulenc, such as, for example, Zeosil 1165MP and silicas available from Degussa AG with designations such as, for example, VN2, VN3 and BV3370GR and - from JM Huber as Zeopol 8746. When silica reinforcement is desired, particularly reinforcement Quantitative silica, for a rubber tire tread, conventionally precipitated silica is used in particles with a coupling agent, or what is referred to - sometimes as a silica coupler. The compounds capable of reacting with both the silica surface and the rubber elastomer molecule, in a manner to cause the silica to have a reinforcing effect - on the rubber, many of which are generally known to those skilled in the art. material as coupling agents or couplers, are frequently used. These co-blowing agents, for example, can be pre-mixed or, pre-reacted, with the silica particles or added to the rubber mixture during decaduction / silica processing, or mixing step. If the coupling agent and silica are added separately to the rubber mixture during rubber / silica mixing, or processing step, it is considered that the coupling agent is then combined, in situ with the silica. In particular, said coupling agents, for example, can be composed of a silane having a constituent component, or fraction, (the silane portion) capable of reacting with the silica surface and, likewise, a constituent component, or fraction , capable of reacting with rubber, particularly vulcanizable rubber with sulfur containing carbon-carbon double bonds, or unsaturation. In this way, then the coupler acts as a connection bridge between the silica and the rubber and thus improves the rubber reinforcement aspect of the silica. In one aspect, the silane of the coupling agent apparently forms a bond to the silica surface, possibly through hydrolysis, and the interactive rubber component of the coupling agent is combined with the rubber itself. Many coupling agents are taught to be used in combining silica and rubber, such as, for example, silane coupling agents containing a polysulfide component, or structure, such as, for example, bis- (3-trialkoxysi 1) polysulfides. i lalqui lo) containing from 2 to about 8 connecting sulfur atoms in the sulfide bridge representative of which is, for example, bis- (3-triethoxysi 1 i-propyl) polysulfide containing an average of about 3.5 to approximately 4 sulfur atoms of connection in its sulfidic bridge that in occasion is denominated like a tetrasulfuro. It is easily understood by those of ordinary skill in the art that the rubber composition of the rolling rubber would be compounded by methods generally found in the rubber composition branch, such as mixing the various vulcanizable constituent rubbers in the rubber composition field. sulfur with various commonly used additive materials, such as for example curing aids, such as sulfur, activators, retarders and accelerators, processing additives, such as oils, resins which include tackifying resins, silicas, and filled plasticizers , pigments, fatty acid, zinc oxide, waxes, antioxidants and antiozonants, peptizing agents and reinforcing materials, such as, for example, carbon black. As is known to those skilled in the art, depending on the intended use of the vulcanizable material with sulfur and vulcanized with sulfur (rubbers), the additives mentioned above are commonly selected and used in conventional amounts. typically, carbon black additions, for this invention, if used, are discussed above. Typical amounts of tackifying resins, if used, comprise from about 0.5 to about phr, usually from about 1 to about 5 phr. Typical amounts of processing aids comprise about 1 to about 5 phr. Said processing aids may include, for example, aromatic, naphthenic and / or paraffin processing oils. Typical amounts of antioxidants comprise about 1 to about 5 phr. Representative antioxidants may be, for example, diphenyl-p-phenylenediamine and others, such as, for example, those described in the Vanderbilt Rubber Handbook (1978), pages 344-346. Typical amounts of antiozonants comprise about 1 to 7 phr. The typical amounts of fatty acids, if used, which may include steric acid, comprise about 0.5 to about 3 phr. The typical amounts of zinc oxide comprise about 2 to -about 5 phr. Typical amounts of waxes comprise about 1 to about 5 pyr. Microcrystalline waxes are often used. Typical amounts of peptizers comprise, for example, from about 0.1 to about 1 phr. Typical peptizers may be, for example, pentachlorothiophenol and dibenzamidodiphenol disulfide. The vulcanization is conducted in the presence of a sulfur vulcanization agent. Examples of suitable sulfur vulcanization agents include elemental sulfur (free sulfur) or sulfur donor vulcanizing agents, for example, an amine disulfide, polymeric polysulfide or sulfur olefin adducts. Preferably, the vulcanization agent is elemental azine, as is known to those skilled in the art, the sulfur vulcanization agents are used in an amount ranging from about 0.5 to about 4 phr., or even, in some circumstances, up to about 8 phr, with a scale of around 1.5 to about 2.5, sometimes from 2 to 2.5, being preferred. Accelerators are used to control the time - and / or temperature required for vulcanization and to improve vulcanization properties. The retarders are also used to control the vulcanization rate. In one embodiment, a single accelerator system, ie, primary-accelerator, can be used. Conventionally and preferably, a primary accelerator (s) 9 s) is used in total amounts ranging from about 0.5 to about 4, alternatively from about 1 to about 2 phr. In another method, combinations of primary and secondary accelerator can be used, with the secondary counter being used in amounts of about 0.05 to about 3 phr, for example, in order to activate and improve the properties of the vulcanized. The combinations of these accelerators could be expected to produce a synergetic effect on the final properties and are somewhat better than those produced by the use of any accelerator alone, in addition, the delayed action accelerators can be used that are not affected by the temperatures of normal processing, but produce a satisfactory cure at ordinary vulcanization temperatures. The appropriate types of accelerators 4 which may be used in the present invention are amines, disulphides, guanidines, thioureas, thiazoles, thiurams, sulfenamides, di thiocarbamates and xanthates. Preferably, the primari accelerator is a sulfenamide. If a second accelerator is used, the secondary accelerator is preferably a guanidine, dithiocarbamate or thiuram compound. The presence and relative amounts of the sulfur vulcanization agent and accelerators) are not considered as an aspect of this invention which is directed more primarily to the use of silica as a reinforcing filler in combination with a coupling agent. The presence and the relative amounts of the above additives are not considered to be an aspect of the present invention that is more primarily directed to a rim with an outer rubber tread cap reinforced with carbon-black over a reinforced portion. with silica of the tread to provide a relatively low electrical resistance path from the outer surface of the tread to the bead portion of the tread band. The rim can be constructed, configured, molded and cured by various methods that will be readily apparent to those who have experience in the field. The composition of the rubber composition of tread band / tread base used in this invention, and also the extension of the top layer of the rolling surface of the track (s), is developed in order to obtain The desired properties of wear, wet and flexing performance, or required, for a lanyard component placed or located in these areas of the tire. A typical rubber formulation contains a mixture of natural rubber (cis-1,4-isoprene rubber), styrene-butadiene copolymer rubber pre-stopped by emulsion polymerization (E-SBR), and cis-1 rubber. , 4-poly ibutadiene. Natural rubber is used to improve wear resistance E-SBR is used to improve the performance¬ * Wet tread (wet traction) and polybutadiene rubber is used to improve the flexural properties. The content of carbon black in the rubber composition is optimized to obtain reinforcement and bending properties. A carbon black content on a scale of about 50 to about 80 phr is usually considered satisfactory. Other conventional rubber composition ingredients are added to the rubber composition as is customary for tire sulfur-curable rubber compositions. In one aspect of the practice of this invention, it is important. Note that, since the upper tread cap layer will be an extension of the tread flaps as a unitary rubber composition, the tread rubber compound composition is prepared with properties more closely aligned with the tread compound. the properties of tire tread. This is considered to be a departure from the conventional past practice where the roller band flaps, particularly for a sidewall rim tire construction, are prepared with associated rubber properties and composition more closely aligned with each other. -the rubber composition of the side wall of the rim on which the tread flaps overlap. The invention can be better understood by reference to the following examples in which the parts and percentages are by weight, unless otherwise indicated.

EXAMPLE I The electrical resistance of a rim, for the purposes of this invention, is measured with the aid of a rigid electrically conductive metal (steel, for example) of a wheel on which the rim is mounted to create a rim assembly. rim wheel, a flat steel plate on which the rim of the rim / wheel wheel assembly is pressed and an instrument for measuring the electrical resistance associated between the rim wheel and the steel plate before mentioned. The test prescribed herein is herein designed for the purpose of this description as a charged electrical resistance test which, for convenience, may be referred to herein as Test GT-L. This test, at this time, is not one prescribed by ASTM or the test procedure of the tire industry association.

Apparatus and Procedure: 1. A flat steel plate having a thickness of at least about 5 mm and a length and width greater than the tread of the rim to be tested: 2. An electrically insulating plate, electrically non-conductive (polyethylene, for example) at least as long and wide as the aforementioned steel plate and placed under and against the steel plate - whereby the insulation resistance of the steel plate through the plate insulation - which is at least 100 times greater than the test value measured for the electrical resistance between the tire tread (e.g., the above-mentioned steel plate) and the wheel - steel rim of the aforementioned 11-wheel rim / wheel assembly; 3.- a voltage source of about 100 volts and power within 0.01 and 3 watts and a resistance meter instrumentation to read the resistance in ohms or megohms with an accuracy of +/- 10 percent; 4.- Appropriate copper connector wiring: (a) from the steel rim wheel to the copper strip from the lantan set / rim wheel to the - resistance instrumentation; and (b) from the steel plate to the ressistance instrumentation; 5.- tire that is going to be tested; 6. - electrically conductive steel rim wheel; and 7.- apparatus for pressing the rim / wheel assembly of the rim against the steel plate and associated pressure measurement instrument. In accordance with the test procedure, the rim is mounted on a rim steel wheel and inflated with air pressure at 100 percent of the test pressure of approximately 2.2 bar which is considered herein as being the # standard for radial tires for passengers. Before the test, the tire is inflated, on the steel rim wheel, at the test pressure and for at least 8 hours at room temperature between 15 and 30 ° C at a relative humidity of less than 60 percent. A test load is applied to the rim / rim assembly against the aforementioned steel plate in a capacity equal to 80 percent of the load indicated for the rim - by its load index. The rim / wheel wheel assembly is loaded, as described above, twice within one minute. Then the assembly is charged for a third time for a duration of three minutes after which the electrical measurements are taken and are reported in ohms resistance omegohms between the rim wheel and steel plate below the tire tread. charged This procedure is repeated at least three times in approximately equal spaced locations around the 1 lanta.

EXAMPLE II Pneumatic rubber tires are prepared, identified herein as Tires A, B and C of a type and size 185/70 / R14. All rims have rubber frames reinforced with identical carbon black with heels and associated side walls. The lantas were from a construction of the rodamieri band * to and tread-fin, with the tread band itself being cap / base construction. All treads have the same surface configuration of projections and grooves, with the grooves connecting with the side walls of the rims in the shoulder region. Rim "A" is considered here as a control with a tread construction composed of a double extrusion of (i) a tread cap and (ii) tread base and two tread flaps. individually spaced bearing adjoining the tread on the axial outer edges of the tread and each - one overlapping a portion of its associated sidewalls; wherein the rubber tread stage is quantitatively reinforced with silica and contains a nickel-carbon black and wherein the tread base and the tread rubber is quantitatively reinforced with carbon black and without silica. Layers "B" and "C" had similar double-tread tread construction, except that the extrusion - (ii) also contained an extension of the tread flap as a thin rubber layer that was spread over the tire. Integrate with a portion of the outer surface of the extrusion (i) of the tread cap and cover at least one part of the outer surface of the tread cap intended to make contact with the ground. All the tires, after vulcanization in an appropriate mold, had a tread pattern of a protrusion and groove configuration. Even though, for the purposes of this example, the rolling bearing bands are described as being of cap / base construction, said construction being considered as a viable tread construction and that the construction illustrated by this Example adequately describes. a better way - to practice the invention. For said cover / base construction for the tread, the tread base can be either of the aforementioned double extrusion wherein is a part of the (ii) tread flap and the extrusion layer of the tread. outer tread and thus the same or consistent rubber composition, or the tread base can be of a rubber composition different from any tread rubber tread rubber and formed by (1) a triextrusion of the rolling belt, fin and base rubber compositions and (2) applying the tread base as an additional rubber layer to the double extrusion or the tread and fins of tread with the above-mentioned outer tread layer extension. The tire identified herein as Rim "C" - is the same as Rim "B", except that an outer portion of the vulcanized tread projections and the accompanying outer layer of coextruded layer extending from The tread fins have been worn away, exposing the silica-reinforced tread rubber on the external protrusion surface of the 1-inch tread. The tires are evaluated for their electrical resistance by the aforementioned electrical resistance test "GT-L test". The compositions for the tread, tread fin and outer layer of tread respecting that extends from the tread flaps e_s so included of the materials shown in the following Tables 1 - 2. In particular , the tread of the Rim A of Control is a double extrusion of the (i) tread rubber composition shown in Table 1, and (ii) the composition of tread base rubber and minialetas of the Table 2, without outer layer of tread.

The treads of the "B" and "C" tires are - a double extrusion of (i) the rubber composition of the rubber band shown in Table 1 and, (ii) the base of the belt band, minialetas and cap layer of external tread shown in table 2. As noted in the foregoing in this example, the - Rim "B" is the same as the rim "C", except that the rim -C it has the outer surfaces of its worn tread bosses, thus eliminating the top-tread cap layer from the outer surfaces. of the projections, thus leaving the outer bearing-belt cover layer on the sides of the projections in the tread grooves. The aforementioned double-extruded treads are appropriately constructed towards the tire frames and the assembly thereof is vulcanized in a rim mold at a temperature of about 160 ° C for about -15 minutes to form cured pneumatic tires with tread and groove tread configurations.

F Table 1 (Bearing Belt) Wheels A, B and C Parts Non-Productive Mixing Stages E-SBR 25 Isoprene / Butadiene Rubber 45 BR3 20 Natural Rubber 10 Processing Aids 25 f. Fatty Acid 2 Silica7 80 Carbon Black, Type Bearing Band 0 Q Copulation Agent 12 Productive Mixing Step Sulfur 1 Zinc Ozide 4 Antioxidant (s) 3 Accelerators type Sulfenamide and Tiuram 4 1) SBR prepared by emulsion polymerization obtainable from The Goodyear Tire & Rubber Company that has a styrene content of approximately 40 percent. 2) Isoprene / butadiene copolymer elastomer having a Tg of about -45SC and an isoprene content of about 50 percent, obtained from The Goodyear Tire & Rubber Company. 3) Cis-1, 4-polybutadiene rubber obtained as Budene (R) * 1207 from The Goodyear Tire & Rubber Company 4) Natural rubber (cis-1, 4-poly isoprene). 5) Rubber processing oil as being about 9.4 parts in the E-SBR, where the amount of E-SBR is reported above on a dry weight (without the oil) and in addition, about 15 additional parts of oil Processing of rubber, plasticizers, resins and waxes are added. 6) Of the type of di-ari lparafeni lendiamine and dihydro-trimethoxyquinoline. 7) A silica obtained as Zeosil 1165MP from Thone-Poulenc 8) obtained as bis-3- (triethoxysi 1 ipropro) tetrasulfide (50% active) commercially available as S50S from Degussa as a 50/50 mixture of tetrasulfide with carbon black N330 (thus, considered 50%). % active .

Table 2 (Minialetas, Base of band of Bearing and External layer of Tape of Bearing) Materials Lanta to Rims B and C Non-productive Mixing Stages E-'SBR 0 30 Natural Rubber * 1 40 40 Rubber of cis-1, 4- poly ibutadiene 60 30 Processing aids 20 40 Fatty Acid 2 2 Carbon Black, N550 (BET = 42m2 / g) 50 70 Productive Mixing Step Sulfur 2.5 2.5 Zinc Oxide 2 2 Antioxidant (s) 5.5 5.5 Sulfenami Type Accelerators - da and Tiuram 1) SBR prepared by emulsion polymerization, obtainable from The Goodyear Tire & Rubber Company that has a styrene content of about 23 percent reported here on a dry weight basis. 2) Natural rubber (cis-1,4-isoprene). 3) Cis-1,4-polybutadiene rubber obtained as Neocis MR BR 40 from Enichem. 4) Rubber processing oil as approximately 10 parts in the E-SBR, where the amount of E-SBR is reported above on a dry weight (without the oil) and, which includes rubber processing oil and waxes; as well as plasticizer and resin for tires B and C. 5) Of the type of di-ari 1-parafeni len-diamine and dihydro-trime ti 1-quinol ina. The electrical resistance measurements were conducted in the A, B and C lnates using the charged electrical resistance test described above "GT-L Test". The results of the tests (average values) are shown in the following Table 3.

Frame 3 Electric Resistance Tire 1 A (Control) 27,000 8.3 7.0 1) Megohms These electrical resistance measurements demonstrate that, for the tread with reinforced rubber tread - quantitatively with silica, the application of the upper tread cap layer of rubber quantitatively reinforced with carbon black, integral, covulcanized, double extruded, which extends from and as part of the minialetas through the external surface of the tread intended to make contact with the earth can significantly reduce the electrical resistance of the rim between its outer tread surface and its internal heel portion. In the description of this invention, in some cases - reference is made to a triextrusion process. It is recognized that, in conventional practice, said extrusion or extrusion process is often referred to as a triple extrusion or triple extrusion process. In the practice of this invention, the precipitated silica is prescribed as a rubber reinforcing filler. It should be understood that when said silica is used in the practice of this invention as a reinforcing filler, it is used in combination with a silica coupler. Although certain modalities and representative details have been shown for the purpose of illustrating the invention, it will be apparent to those skilled in the art that various changes and modifications may be made therein without abandoning the spirit or scope of the invention.

Claims (16)

1. - A pneumatic tire composed of a rubber frame reinforced with carbon black having two individual side walls and two spaced bead portions and a circumferential rubber tread band composed of a tread band and a pair of band flaps of spaced bearings, each individually positioned adjoining and extending axially outwardly from opposite sides of the tread to overlap at least a portion of the outer surface of each of the two sidewall portions of the rim frame, characterized in which the tread is comprised of vulcanizable rubber laminate with double extrusion sulfur composed of (i) a tread and, (ii) the tread band flaps with an outer top tread cap layer - that extends from each of the tread and integral fins with and that cover cuajn * at least a portion of the outer surface of the rod band designed to be in contact with the ground; wherein - the tread contains about 30 to about 100 phr of optionally precipitated silica, up to about 20 phr of carbon black; and wherein the tread flaps and the outer top tread cap are of a unitary rubber composition and contain about 25 to about 100 phr of carbon black having a BET value on a scale of about 30 at approximately 1000 m / g.

2. The pneumatic tire of claim 1, characterized in that the tread construction also has a tread base that is below the tread, extending both of the tread flaps, Composed of the rubber composition of the tread fins; wherein the construction is a double extrusion of (i) the tread rubber composition and (ii) the rubber composition of the tread fins, the outer tread cap layer and the -base tread.

3. The rim of claim 1 or 2, characterized in that when the tread sheets are formed by coextrusion at a temperature on a scale of about -80 ° C to about 150 ° C.

4. The pneumatic rim of claim 1, characterized in that the tread construction also has a tread base that underlies the tread band, which extends to both tread and tread flaps. Composed of a rubber composition quantitatively reinforced with carbon black that differs from the composition of rubber tread and tread fins; wherein the construction is a triextrusion of (i) the tread rubber composition, (ii) the rubber composition of the outer cap layer and (iii) the rubber composition of the tread base. tread.

5. The pneumatic tire of claim 1, characterized in that the tread construction also has a tread base that underlies the tread, which extends both of the tread and tread flaps.

Composed of a quantitative rubber composition reinforced with carbon black that differs from the rubber composition of the tread and the tread fins; wherein the construction is a double extrusion of (i) - * 'the tread rubber composition and (ii) the rubber composition of the tread fins, the outer layer of the tread layer; and wherein the rubber composition of the tread base is laminated to the double-extruded tread construction after the double extrusion thereof. 6.- The rim of any of the previous relics, characterized in that the rim is vulcanized, whereby the upper tread layer layer is covulcanized and is integral with the tread and tread fins and where the tread has a outgoing and groove. 7.- The rim of any of the previous vindications, characterized in that the rim without the top cover layer of the tread has an electrical resistance greater than 20,000 megohms and the rim with the upper band cover of (p.

The bearing has an electrical resistance of less than 100 megohms, in accordance with Test GT-L and, where the tread layer of the upper tread on the walls of the tread projections has a thickness on a scale of about 0.01 to about 0.5 mm 8.

The rim of any of the preceding claims, characterized in that the integral upper tread cap layer circumferentially covers the outer peripheral surface of each side of the tire. external rolling band surface intended to be in contact with the ground and covers about 20 to about 100 percent of the total external surface of the tread.

The rim of any of the preceding claims, characterized in that the construction of tread reinforced with silica is provided without and in the absence of - a quantitatively reassigned carbon black and the relatively conductive electric rubber element placed within the proper tread composition and extending between the rim shell and the outer portion of the tread band that is intended to be in contact with the ground.

10. The rim of any of the preceding claims, characterized in that the tread, fins - tread and outer tread layer are composed of one or more elastomers selected from homopolymers and copolymers of hydrocarbons of conjugated diene and copolymers of conjugated dienes and aromatic vinyl compounds selected from styrene and alphamethylstyrene.

11. The rim of claim 10, wherein the elastomers are selected from at least one of cis-1,4-isoprene (natural and synthetic) cisllM, 4-polybutadiene, styrene copolymers. butadiene as copolymers prepared by emulsion polymerization and as copolymers prepared by polymerization of organic solution, copolymers of isoprene / butadiene, copolymers of styrene / isoprene, 3,4-polyisoprene, polybothiethylene with a high relative content of vinyl containing about 30 to about 85 percent vinyl content and styrene / isoprene / butadiene terpolymers.

12. A method for preparing a rim composed of a vulcanized rim assembly of () A rubber frame mountable with sulfur, reinforced with carbon black having two individual side walls, and two spaced heel portions and ( B) a vulcanizable rubber with sulfur tread structure, pretened to make contact with the earth, placed circumferentially around and integral with the external circumferential surface of the frame; characterized in that the tread structure is composed of a tread band and a pair of spaced tread fins, each fin individually placed adjoining and extending axially outwardly from opposite sides of the lap band to overlap. at least a portion of the outer surface of each of the two sidewall portions of the lamella frame, comprising the steps of (i) extruding a laminate of tire rim tread construction vulcanizable with sulfur composed of (a) the tread rubber composition portion and (b) the tread rubber rubber composition portions with an outer top tread cap layer extending from each of the tread regions. portions of tread flap and covering at least a portion of the surface of the tread intended to be in contact with the Earth; wherein the tread fin portions and the upper tread cap layer are of a single-faced rubber composition; wherein the tread runs from about 30 to about 100 phr of pre cipitated silica and, optionally, up to about 20 phr of carbon black; and wherein the tread flaps and the outer upper tread plate are of a unitary rubber composition and contain about 25 to about 100 phr of carbon black having a BET value on a scale-of about 30 at approximately 1000 m / g; (ii) applying the double extruded tread structure circumferentially towards and around the outer circumferential surface of the frame to form the rim assembly thereof, and (iii) vulcanizing the rim assembly in a mold with sulfur. suitable under high temperature conditions to form a vulcanized rim.

13. The method of claim 12, characterized in that the tread structure is of a cap / base construction of a portion of the tread cap and a portion of the tread base. wherein the roll band size is the tread rubber composition; where the tread base underlies the tread cap and extends to and makes contact with -the tread band flaps, in which method the tread structure is prepared by double extrusion of (i) the rubber composition of tread cap and (ii) the tread fins, the extension of the cap layer - upper outer tread of the fins and the rubber composition portions of the bearing base; wherein the tread flaps, the outer top layer of the top band and the tread base are of a unitary rubber composition substantially enveloping the portion of the tread stage.

14. The method of claim 12, characterized in that the tread structure is of a cap / base construction of a tread cap portion and a tread base portion in the that the bearing-band cover is the tread rubber composition; wherein the tread base underlies the tread cap and extends to and makes contact with the tread band flaps and the tread base is of a rubber composition that differs from the tread compound composition. of the tread flaps and the extended upper tread layer, where the tread portion of the tread band is triextruded with the tread-roller cover and the tread flap and the portions -from upper tread layer to form a rim tread construction before preparing and vulcanizing the rim assembly.

15. The method of claim 12, characterized in that the tread structure is of a cap / base construction of a tread cap portion and a tread base portion in the tire body. that the bearing-band cover is made of rubber-band composition; wherein the tread base underlies the roll band cap and extends to and makes contact with - the roll band flaps and the tread base is of a rubber composition that differs from the rubber composition of the tread flaps and the extended upper tread layer, wherein the base portion of the tread band is laminated to the strapping strip and extruded double strand band flap and the portions thereof. upper roll band layer to form the roll band construction before preparing and vulcanizing the rim assembly.

16. - The rim of any one of the preceding claims, characterized in that the integral top cap layer extends from the tread fins to a location around 20 to about 80 percent of the distance from the inner edge of each fin of the tire. tread band to the centerline of the tire rim band. Summary of the Invention The invention relates to a rubber rim made of rubber reinforced with carbon black and having a rubber tread which is quantitatively reinforced with an electrically non-conductive filler pigment, such as, for example, silica and, which, in turn, is when # less partially and, preferably substantially, wrapped by the carbon reinforced rubber of a consistent or continuous composition. In one aspect, the rubber layer extends through at least a portion of the outer surface of the tread which is normally intended to make contact with the earth and wraps both, the ends and optionally the inner surface of a band. of rim bearing, which may be a tread cap of a cap / base bearing construction. The rubber layer connects to at least one other rubber component, or reinforced with carbon black of the rim in a manner to provide a reduced electrical resistance path from the layer on the outer surface of the rip band to the portion. of the bead of the rim frame and, therefore, said path of the vehicle to a cmain surface. In one aspect, it can be seen that the construction of the tread band can be a double extrusion of (i) the tread rubber, and (ii) the rubber layer composed of tread-and-extension treads. of associated rubber layer on the outer surface of the tread.