NL2003748C2

NL2003748C2 - Tire and method for manufacturing a tire.

Info

Publication number: NL2003748C2
Application number: NL2003748A
Authority: NL
Inventors: Petrus Johannes Swaaij; Cristian Bernard Maria Greve; Laura Bosch; Louis-Philippe Antoine Euga Ne Maria Reuvekamp; Paulus Bremmer
Original assignee: Apollo Vredestein Bv
Priority date: 2009-11-03
Filing date: 2009-11-03
Publication date: 2011-05-04

Description

Tire and method for manufacturing a tire

The invention relates to a tire, comprising a carcass and a tread portion for contact with the road. The invention also relates to a method for manufacturing such a tire.

5 A tire according to the preamble is known from EP1437371B1. Herein, a pneumatic tire is described comprising a tire tread layer which is formed by curing a polyurethane resin composition comprising a compound having active hydrogen atoms and an organic polyisocyanate compound, having an oxygen permeation coefficient at 23°C 10 under a relative humidity of 60% of 2.0 ml.mm/m2.day.MPa or smaller and further comprising 20% by weight or more of a specific skeleton structure represented by formula (1) of EP1437371B1. The specific skeleton structure provides the ability for retaining internal pressure within the pneumatic tire.

15 Although air tightness of a pneumatic tire is obviously important, other desired properties of such a tire include a low rolling resistance and a good grip on the road. Rolling resistance directly influences fuel consumption, while the grip on the road is one of the dominant safety factors.

20 A drawback of the known tire having tire tread layers made from the above described specific polyurethane resin is its relatively poor grip on the road. Also, the stability of the tire may be improved further.

The present invention has for its object to provide a tire and method for manufacturing 25 said tire, wherein the above stated drawbacks of the known tire are at least partly obviated.

This objective is achieved according to the invention by providing a tire comprising a carcass of a polyurethane polymer and a tread portion of a rubber polymer, wherein the 30 tread portion is molded with the carcass by providing, between the tread portion and the carcass, a first intermediate layer of a rubber polymer comprising a compound containing carboxylic acid anhydride, and a second intermediate layer of a composition comprising at least a polyisocyanate, a polyol and a catalyst, and polymerizing at least the second intermediate layer. The tire according to the invention combines a low 2 rolling resistance with excellent grip on the road, since, according to the invention, the rubber polymer of the tread portion can be specifically selected for that purpose. It turns out that this selection does not substantially impair other desirable properties of the tire such as a low rolling resistance.

5

Rolling resistance relates to the force resisting relative movement of a tire and the road. As the tire rotates under the weight of the vehicle, it experiences repeated cycles of deformation and recovery. Since the rubber in a tire exhibits hysteresis, the tire will dissipate the hysteresis energy loss as heat. Hysteresis is the main cause of energy loss 10 associated with rolling resistance and is attributed to the viscoelastic characteristics of the rubber. An additional advantage of the tire according to the invention is that the low rolling resistance properties of polyurethane are substantially maintained, notwithstanding the addition of a tread portion from a rubber polymer, and the first and second intermediate layers.

15

The invention also relates to a method for manufacturing a tire comprising a carcass of a polyurethane polymer and a tread portion of a rubber polymer. The method comprises at least the following steps of (A) providing a carcass of a polyurethane polymer and a tread portion of a rubber polymer; (B) providing between the tread portion and the 20 carcass a first intermediate layer of a rubber polymer comprising a compound containing carboxylic acid anhydride; (C) providing between the tread portion and the carcass a second intermediate layer of a composition comprising at least a polyisocyanate, a polyol and a catalyst, (D) bringing the carcass and the tread portion together; and (F) polymerizing at least the second intermediate layer at a suitable 25 temperature. The tread portion and/or the carcass are preferably vulcanized and/or polymerized.

In another embodiment of the invented method for manufacturing a tire comprising a carcass of a polyurethane polymer and a tread portion of a rubber polymer, the method 30 comprises at least the following steps of (A) providing a carcass of a composition comprising at least a polyisocyanate, a polyol and a catalyst, (B) providing a tread portion of a rubber polymer comprising a compound containing carboxylic acid anhydride; (C) bringing the carcass and the tread portion together; and (D) polymerizing at least the tread portion at a suitable temperature. A method according to this 3 embodiment provides a preferred embodiment of the tire according to the invention, wherein the first intermediate layer forms part of the tread portion. In another preferred embodiment, the second intermediate layer forms part of the carcass. Most preferred is an embodiment of the tire wherein the first intermediate layer forms part of the tread 5 portion, and the second intermediate layer forms part of the carcass. Such an embodiment is easy to manufacture and moreover provides an improved rolling resistance.

The known tire generally comprises several parts. Typical parts include the tread 10 portion, the shoulders, the sidewalls, the bead, carcass, belt and inner liner. The tread portion is that part that comes in direct contact with the road when driving. The shoulders are located between the tread and the sidewalls, and act to protect the tire against impact loads, for which reason they are usually the thickest rubber part in the tire. The flexible sidewalls are located between the shoulder and bead, protect the 15 carcass and enhance the ride. They are also used to indicate the type, size, structure, pattern, manufacturing company, product name and the like of the tire. The bead is that part of the tire that attaches the tire to the rim and wraps the end of the cord fabric. Comprised of the bead wire, core, flipper and other parts, the bead is generally designed to be slightly tight around the rim so that in the case of a sudden drop in inflation 20 pressure, the tire will not fall off the rim. The carcass represents the tire structural framework and acts to support air pressure, vertical load and absorb shocks. The breaker is a cord layer placed between the carcass and the tread in order to protect the carcass of a bias tire. The breaker reduces shocks, prevents rips or injury of the tread from reaching the carcass directly while also stopping the separation between the rubber layer 25 and the carcass. The belt is a strong reinforcement found between the tread and the carcass in a radial or belted bias tire. It functions much like the breaker but also increases tread rigidity by tightly winding about the carcass. The inner liner finally is made of a layer of rubber that resists air diffusion and replaces the inner tube within a tire. Generally made of a (halogenated) butyl rubber, the inner liner maintains the air 30 inside the tire.

It is clear from the above that a tire is a complex product with each part providing a particular essential function. A particularly preferred tire according to the invention is characterized in that the carcass is molded in one piece and further preferably comprises 4 reinforcing yams or cords, embedded in a polyurethane polymer. In this embodiment, the functions of air tightness, mechanical strength and structural rigidity are all combined in the carcass. Although any type of reinforcing yams or cords may be chosen, preferred reinforcing yams or cords comprise steel cords, nylon, polyester 5 and/or cellulose yams, glass and/or carbon yams or cords, and more preferred aramid yams or cords. The polyurethane polymer may be thermosetting or thermoplastic, with the thermosetting polyurethane preferred.

In a preferred embodiment, the tire according to the invention comprises a separate 10 inner liner, preferably of a semi-crystalline, thermoplastic polymer, more preferably of thermoplastic polyurethane (TPU). In another preferred embodiment, the tire according to the invention does not comprise a separate inner liner, the function of air tightness being substantially provided by the carcass. An additional advantage of such embodiment is that hysteresis in the tire is further reduced, resulting from a reduced 15 number of assembled parts. This reduces rolling resistance further.

Rubber polymers frequently applied in the rubber industry, such as for instance natural mbber, styrene-butadiene mbber, butadiene mbber and ethylene-propylene-diene rubber, are apolar. Molding such rubbers with other polar polymers, such as the 20 polyurethane polymer of the carcass, easily leads to a poor bond and therefore to delamination during use. In the tire according to the invention a good bond exists between carcass and tread portion, notwithstanding their different properties.

The surfaces of carcass and tread portion may be pretreated, if desired. Pretreatment of 25 the tread portion generally comprises modifying the rubber polymer with polar groups. A likewise frequently applied method comprises treating the surface of the rubber polymer with plasma. Both pretreatments aim to provide polar groups on the contact surfaces, thereby improving adhesion. Pretreatment is time-consuming, and, certainly for plasma treatment, also costly.

The rubber polymer applied in the first intermediate layer of the tire according to the invention can be non-vulcanized or at least partially vulcanized.

30 5

In a preferred embodiment of the method and tire according to the invention, the first intermediate layer and/or the tread portion is obtained by admixing rubber oligomers containing carboxylic acid anhydride to a rubber, admixing other additives if desired, and at least partially vulcanizing the thus formed rubber composition. Vulcanization can 5 for instance take place by arranging the rubber polymer in for instance a vulcanizing mould in the form of the tread portion, and bringing this mould to a suitable vulcanization temperature. If desired, the rubber polymer of the tread portion and/or the first intermediate layer can be in at least partially vulcanized state. Preferably however, the method according to the invention is characterized in that the rubber polymer of the 10 tread portion and/or the first intermediate layer is substantially fully vulcanized.

Suitably applicable compounds containing carboxylic acid anhydride are at least mono functional relative to the polyurethane polymer of the carcass. Mono functional is understood to mean in the context of this application that the compound containing 15 carboxylic acid anhydride will react mainly via the anhydride functionality with the polyurethane polymer of the carcass, and/or via the diacid functionality formed after hydrolysis of the anhydride. This does not preclude that the carboxylic acid anhydride-containing compound possibly comprises other reactive groups, although the reactivity of these groups will preferably be lower than the reactivity of the polyurethane polymer 20 of the carcass with the carboxylic acid anhydride group. Compounds suitable for application are for instance saturated aliphatic (di)carboxylic acid anhydrides, such as for instance succinic acid anhydride, glutaric acid anhydride, adipinic acid anhydride and so forth. Also suitable are cycloaliphatic dicarboxylic acid anhydrides, such as for instance cyclohexane-dicarboxylic acid anhydride. Application of cycloaliphatic 25 dicarboxylic acid anhydrides has the additional advantage that discoloration as a result of for instance sunlight is prevented. In addition, dicarboxylic acid anhydride-containing compounds which comprise ethylenic unsaturations are preferably suitable. An example of such an ethylenic unsaturated compound is maleic acid anhydride (MAA). Also particularly suitable are compounds comprising an aromatic unsaturation, 30 such as for instance phtalic acid anhydride and/or trimellitic acid anhydride. The amount of compound containing (di)carboxylic acid anhydride to be applied in the rubber polymer of the tread portion can be selected within broad limits. For a given rubber polymer of the tread portion and/or the first intermediate layer, and the polyurethane polymer of the carcass a suitable quantity will generally be determined by 6 determining that quantity which produces the highest level of adhesion between the tread portion and the carcass.

A preferred embodiment of the method according to the invention is characterized in 5 that between 1 and 50% by weight of rubber oligomers containing carboxylic acid anhydride are admixed to the rubber relative to the weight of the rubber, more preferably that between 5 and 25% by weight of rubber oligomers containing carboxylic acid anhydride are admixed to the rubber relative to the weight of the rubber, and most preferably that between 8 and 15% by weight of rubber oligomers containing carboxylic 10 acid anhydride are admixed to the rubber relative to the weight of the rubber.

According to the invention a second intermediate layer of a composition comprising at least a polyisocyanate, a polyalcohol and a catalyst is arranged between the tread portion and/or the first intermediate layer, and the carcass. After polymerization, a 15 polyurethane as described below is thus obtained by means of polyaddition. This relates to the reaction between isocyanates and alcohols and, particularly for the building of macro molecules, the reaction between at least bifunctional starting materials. The invented method is therefore preferably performed with di-isocyanates, tri-isocyanates, and diols, triols and/or polyols. The functionality of the starting material determines 20 whether a thermoplastic (bifunctional) or a thermoset (trifunctional) is obtained as end product.

Polyisocyanates suitable for application in the second intermediate layer and/or carcass composition comprise toluene diisocyanates, m-phenylene diisocyanate, 25 4-chloro-l,3-phenylene diisocyanate, 4,4'tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate, 1,10-decamethylene diisocyanate, 1,4-cyclohexylene diisocyanate, 4,4'-methylene bis cyclohexane diisocyanate, 1,4-cyclohexane bis methyl isocyanate, isophorone diisocyanate, 1,5-tetrahydronaphthalene diisocyanate, p-xylene diisocyanate, m-xylene diisocyanate and polymers, such as dimers en trimers of such 30 diisocyanates. This series is given only by way of example, and is by no means intended as limitative.

Polyols, and in particular diols, suitable for application in the second intermediate layer and/or carcass composition comprise aliphatic diols such as for instance ethylene 7 glycol, propane-1,2-diol, propane-1,3-diol, butane- 1,2-diol, butane-1,4-diol, butane- 1,3-diol, 2,2-dimethyl propanediol-1,3 (= neopentylglycol), hexane-2,5-diol, hexane-1,6-diol, 2,2-bis(4-hydroxycyclohexyl)-propane (hydrogenated bisphenol-A), 1,4-dimethylolcyclohexane, diethyleneglycol, dipropyleneglycol and 2,2-bis[4-2— 5 hydroxyethoxy)-phenylpropane. It is also possible to apply aromatic polyalcohols and/or relatively small quantities, such as less than about 4% by weight, but preferably less than 2% by weight, of trifunctional alcohols.

In a preferred embodiment of the method according to the invention the second 10 intermediate layer and/or carcass composition comprises a short chain diol and a long chain diol. In the context of this application a short chain diol is understood to mean a diol comprising 1 to 50 carbon atoms. In the context of this application a long chain diol is understood to mean a diol comprising at least 51 carbon atoms. Different compounds can be applied as chain extender or flexible chain, provided they have a group reactive 15 with the isocyanate. Examples of suitable reactive groups comprise hydroxyl groups, amines, acids and thiols. Generally speaking, suitable reactive groups comprise a nucleophilic part, which in the context of this application is understood to mean a negative ion or molecule with a non-binding or free electron pair which can react relatively simply with an electrophilic particle, generally as electron-pair donor.

20 All catalysts known for polyurethane reactions, such as for instance metal complexes, are in principle applicable in the adhesive composition. The quantity of catalyst generally lies between 0.01 and 3% by weight relative to the overall weight of the adhesive composition, although other contents are possible.

25 The surfaces of the tread portion, the intermediate layers, and/or the carcass may be pretreated, for instance by roughening, sanding, degreasing, providing the surfaces with a primer or other pretreating agent and/or providing the surfaces with radicals. The latter can for instance take place by irradiating the surfaces with radiation of suitable wavelength, for instance UV light, if desired laser radiation. It is also possible to subject 30 the surfaces to an additional plasma treatment, although this is not essential according to the invention.

According to the invented method, the first and second intermediate layer are provided between the tread portion and the carcass, after which the tread portion and the carcass 8 are joined together, and at least the second intermediate layer is polymerized at a suitable temperature. More particularly, a polyaddition reaction is performed on the at least partly vulcanized tread portion with the different, above-stated building blocks. Preferably a thermosetting polymer is obtained, for which purpose it is necessary to 5 have a trifunctionality in the system. Trifiinctionality can originate from the isocyanate and/or from the chain extender, and/or from the polyol. At least some of the isocyanate groups will react with the anhydride of the rubber polymer and thus form a cyclic imide group. In case the polymer comprises a thermoplastic polyurethane, at least some of the isocyanate groups can in addition also react with the urethane group of the 10 polyurethane, and thus form an allophanate group. By means of the method according to the invention a good adhesion is obtained between the tread portion and the carcass. It is likewise possible according to the invention to perform the polyurethane reaction on the tread portion rubber surface during the vulcanization thereof.

15 The method according to the invention also makes it possible to adhere a polyurethane coating layer to a part of a tire, preferably a tread portion, of a modified rubber composition, in order to influence the rigidity, deformability and strength of said part. This part may then later be combined with a carcass of a polyurethane polymer.

20 The rubber composition from which the tread portion and/or the first intermediate layer are obtained can be prepared in a manner known to the skilled person. Any known method of mixing polymers, fillers and other additives is in principle suitable for this purpose. It is thus possible to mix the rubber composition, optionally supplemented if desired with additives and/or other polymers, using an internal mixer or Banbury mixer, 25 a single or double-screw extruder apparatus, a blade kneader, a Buss Co-kneader, a roller and the like. Suitable temperatures during mixing are substantially determined by the rheological properties of the relevant rubber polymer.

The rubber polymers preferably applied in the tread portion and/or the intermediate 30 layers can be selected from the known rubbers. In general these rubbers have a glass transition temperature Tg lower than -10°C, although this is not essential. Rubbers suitable for application are for instance chosen from the group of natural rubbers, isoprene rubbers, butadiene mbbers, styrene butadiene copolymer rubbers, acrylonitrile butadiene copolymer rubbers, if desired copolymerized with styrene, butadiene isoprene 9 copolymer rubbers, chloroprene rubbers, butyl and acryl rubbers, and ethylene-propylene copolymers which, if desired, comprise a third copolymerizable diene monomer such as for instance 1,4-hexadiene, dicyclopentadiene, dicyclooctadiene, methylene norbomene, ethylidene norbomene and tetrahydroindene. If desired, the 5 rubber composition also comprises a minor quantity of natural rubber and/or elastomer, which is preferably composed of 1,3-diene compounds such as for instance butadiene and/or isoprene and/or 2,3-dimethyl butadiene. The rubber composition applied in the method preferably comprises an ethylene-propylene rubber, a natural rubber, a butadiene rubber, and a styrene butadiene copolymer rubber. Mixtures of said rubber 10 polymers are likewise possible. The rubber compositions may be sulfur-vulcanizable and/or peroxide-vulcanizable. Other vulcanization systems may also be used.

If desired, additives can be added to the rubber polymer, the intermediate layer compositions and the polyurethane polymer. Examples of usual additives are stabilizers, 15 antioxidants, lubricants, fillers, dyes, pigments, flame retardants, conductive fibres and reinforcing fibres. The rubber composition can particularly also comprise an oil as additive. It is also possible to add petroleum plasticizers. If desired, the rubber composition can also comprise a coupling agent. Suitable coupling agents comprise silane compounds. Particularly suitable silane compounds comprise di- and 20 tetrasulphides. Preferably the rubber composition for the tread portion is provided with a conductive filler to make it at least partially conductive.

It has been found that the thickness of the intermediate layers is preferably relatively thin. In a preferred embodiment of the tire, the intermediate layers each have an average 25 thickness of about 0.05 to 0.5 mm, and more preferably an average thickness of about 0.1 to 0.3 mm. In the embodiments in which the first intermediate layer forms part of the tread portion and/or the second intermediate layer forms part of the carcass, the thicknesses may be much higher, being the typical thicknesses of a tread portion or a carcass of a tire. It may be difficult in these embodiments to be able to observe a well 30 defined border of the first and/or second intermediate layer.

The tire according to the invention is particularly suitable as pneumatic tire for passenger cars, cycles, tractors, trailers, trucks, buses, and tires for motor vehicles. The tire may also be non-pneumatic.

5 10

The invention will now be further elucidated on the basis of the accompanying figure 1 and the example below, without however being limited thereto. Figure 1 shows a perspective view of a tire cross-section according to the invention.

Referring to figure 1, a cross-sectional part of a tire 1 according to the invention is shown. Tire 1 comprises a carcass 10 of a polyurethane polymer and a tread portion 20 of a typical rubber compound. A typical tread portion rubber compound is for instance given in Table 1 of EP 0501227A1 as compound I. The tread portion 20 of the 10 embodiment shown comprises an outer part 21, provided with longitudinal grooves 22 and transverse grooves (not shown), and an inner part 26 that acts as cushion for part 21. The longitudinal and transverse grooves define profiled elements 23. At the central part 24 of the tread portion 20, the rubber composition for the tread portion 20 is provided with a conductive filler to make it at least partially conductive. At the sides of 15 the tread portion 20, wing tips 25 are provided.

According to the invention the tread portion 20 is molded with the carcass 10 by providing, between the tread portion 20 and the carcass 10, a first intermediate layer 2 of a rubber polymer comprising a compound containing maleic acid anhydride, and a 20 second intermediate layer 3 of a composition comprising at least a polyisocyanate, a polyol and a catalyst, and polymerizing at least the second intermediate layer 3. The average thickness of first intermediate layer 2 and second intermediate layer 3 is about 0.3 mm.

25 In the embodiment shown, carcass 10 is provided with an inner layer 11 of a thermosetting polyurethane polymer (TPU), and an outer coating layer 12 of steel cords, embedded in a cast polyurethane polymer or a thermoplastic polyurethane. A core layer 13 of metal cords is embedded in layer 12. Tire 1 does not comprise a separate inner liner, since carcass 10 provides adequate air tightness.

30

In another embodiment (not shown) the first intermediate layer 2 forms part of the tread portion 20, and the second intermediate layer 3 forms part of the carcass 10. Further, the tire is provided with an inner liner to further improve air tightness. Such an embodiment of the tire 1 is manufactured according to a method elucidated below.

11 A typical tread portion rubber compound such as the one given in Table 1 of EP 0501227A1 is first prepared in known manner by mixing in a standard kneader. The tread rubber composition comprises 75 parts per hundred rubber (phr) of a SBR and 25 5 phr of a polybutadiene (PB) rubber. The rubber composition further comprises 80 phr of silica , about 45 phr of usual additives such as oil, zinc oxide and stearic acid, and about 1.4 phr of sulfur for vulcanization.

A first intermediate layer rubber composition is then prepared in a known manner by 10 mixing in a standard kneader the following components: 0-100 phr, preferably 60-90 phr, for instance 75 phr of a natural rubber; 0-100 phr, preferably 10-40 phr, for instance 25 phr of a butadiene rubber, the phr of both rubbers adding up to 100 phr; 0-100 phr, preferably 50-90, for instance 75 phr of carbon black; 15 0-5 phr, preferably 1-4 phr, for instance 2.5 phr of zinc oxide; 0-3 phr, preferably 1-2 phr, for instance 1.5 phr of stearic acid; 0-30 phr, preferably 10-20 phr, for instance 15 phr of oil; 0-5 phr, preferably 1 -4 phr, for instance 2 phr of a suitable accelerator; 0.1-5 phr, preferably 1-4 phr, for instance 2 phr of sulphur; and 20 0-30 phr, preferably 10-20 phr, for instance 15 phr of maleic acid anhydride.

The compositions thus prepared are then co-extruded in the required layer thicknesses and relative position, and then formed into a hoop, which is positioned in a suitably shaped mold. The hoop is subsequently vulcanized at a temperature of about 170°C 25 during 10 min to form a tread portion wherein the first intermediate layer is incorporated.

A tire forming mold part is then provided in the form of a core around which a thermoplastic polyurethane (TPU) foil is draped. To this TPU layer are then added steel 30 cords by winding a plurality of such cords around the core provided with the TPU foil. The core mold part provided with the TPU foil and cords is then placed in a second tire forming mold part, together with the previously vulcanized hoop. The space left between the hoop and the TPU foil is then filled with a composition comprising at least polyisocyanate, a diol and a catalyst to form the carcass 10, wherein the second 12 intermediate layer is incorporated. The tire is then polymerized at ambient pressure. If desired, polymerization can take place here at increased temperature.. After about 30-60 minutes the mould is opened and the tire 1 is removed from the mould.

Claims

1. Band omvattende een karkas uit een polyurethaanpolymeer en een loopvlakgedeelte uit een rubberpolymeer, waarbij het loopvlakgedeelte is gevormd met het karkas door tussen 5 het loopvlakgedeelte en het karkas een eerste tussenlaag uit een rubberpolymeer te verschaffen, welk rubberpolymeer een carbonzuuranhydride-houdende verbinding omvat, en een tweede tussenlaag uit een samenstelling die ten minste een polyisocyanaat, een polyol en een katalysator omvat, en ten minste de tweede tussenlaag te polymeriseren.A tire comprising a carcass of a polyurethane polymer and a tread portion of a rubber polymer, the tread portion being formed with the carcass by providing a first intermediate layer of a rubber polymer between the tread portion and the carcass, said rubber polymer comprising a carboxylic acid anhydride-containing compound, and a second intermediate layer of a composition comprising at least one polyisocyanate, a polyol and a catalyst, and at least polymerizing the second intermediate layer.

2. Band volgens conclusie 1, met het kenmerk dat de eerste tussenlaag een deel van het loopvlakgedeelte vormt.Tire according to claim 1, characterized in that the first intermediate layer forms part of the tread portion.

3. Band volgens conclusie 1 of 2, met het kenmerk dat de tweede tussenlaag een deel van het karkas vormt. 15A tire according to claim 1 or 2, characterized in that the second intermediate layer forms a part of the carcass. 15

4. Band volgens één der voorgaande conclusies, met het kenmerk dat het karkas is gevormd uit één stuk en versterkende garens of koorden omvat, die zijn ingebed in een polyurethaanpo lymeer.A tire according to any one of the preceding claims, characterized in that the carcass is formed in one piece and comprises reinforcing yarns or cords embedded in a polyurethane polymer.

5. Band volgens conclusie 4, met het kenmerk dat het polyurethaanpolymeer een thermohardend polyurethaan is.Tape according to claim 4, characterized in that the polyurethane polymer is a thermosetting polyurethane.

6. Band volgens één der voorgaande conclusies, met het kenmerk dat de band geen afzonderlijke binnenvoering omvat. 25Tape according to one of the preceding claims, characterized in that the tape does not comprise a separate inner lining. 25

7. Band volgens één der voorgaande conclusies, met het kenmerk dat het rubberpolymeer is gekozen uit de groep bestaande uit een etheen-propeen-dieenrubber (EPDM), een natuurrubber, een butadieenrubber, en een styreen-butadieen copolymeer rubber. 30A tire according to any one of the preceding claims, characterized in that the rubber polymer is selected from the group consisting of an ethylene-propylene-diene rubber (EPDM), a natural rubber, a butadiene rubber, and a styrene-butadiene copolymer rubber. 30

8. Band volgens één der voorgaande conclusies, met het kenmerk dat de gemiddelde dikte van de eerste en/of de tweede tussenlaag varieert van 0.05 tot 0.5 mm.Tape according to one of the preceding claims, characterized in that the average thickness of the first and / or the second intermediate layer varies from 0.05 to 0.5 mm.

9. Werkwijze voor het vervaardigen van een band, omvattende een karkas uit een polyurethaanpolymeer en een loopvlakgedeelte uit een rubberpolymeer, welke werkwijze ten minste de volgende stappen omvat van: (A) het verschaffen van een karkas uit een polyurethaanpolymeer en een loopvlakgedeelte 5 uit een rubberpolymeer; (B) het tussen het loopvlakgedeelte en het karkas verschaffen van een eerste tussenlaag uit een rubberpolymeer, dat een carbonzuuranhydride-houdende verbinding omvat; (C) het tussen het loopvlakgedeelte en het karkas verschaffen van een tweede tussenlaag uit een samenstelling die ten minste een polyisocyanaat, een polyol en een katalysator 10 omvat, (D) het samenbrengen van het karkas en het loopvlakgedeelte; (F) en het polymeriscren van ten minste de tweede tussenlaag bij een geschikte temperatuur.A method of manufacturing a tire comprising a carcass from a polyurethane polymer and a tread portion from a rubber polymer, the method comprising at least the following steps of: (A) providing a carcass from a polyurethane polymer and a tread portion 5 from a rubber polymer; (B) providing a first intermediate layer of a rubber polymer comprising a carboxylic anhydride-containing compound between the tread portion and the carcass; (C) providing between the tread portion and the carcass a second intermediate layer of a composition comprising at least one polyisocyanate, a polyol, and a catalyst; (D) bringing the carcass and the tread portion together; (F) and polymerizing at least the second intermediate layer at a suitable temperature.

10. Werkwijze volgens conclusie 9, met het kenmerk dat de eerste tussenlaag wordt verkregen door carbonzuuranhydride-bevattende rubber oligomeren in te mengen in een rubber, desgewenst andere toeslagstoffen in te mengen, en de aldus gevormde rubbersamenstelling ten minste gedeeltelijk te vulkaniseren.Method according to claim 9, characterized in that the first intermediate layer is obtained by blending carboxylic anhydride-containing rubber oligomers into a rubber, blending in other additives if desired, and at least partially vulcanizing the rubber composition thus formed.

11. Werkwijze volgens conclusie 10, met het kenmerk dat ten opzichte van het gewicht van het rubber tussen 5 en 25 gew.-% carbonzuuranhydride-bevattende rubber oligomeren worden ingemengd in het rubber.Process according to claim 10, characterized in that, relative to the weight of the rubber, between 5 and 25% by weight of carboxylic acid anhydride-containing rubber oligomers are mixed into the rubber.

12. Werkwijze voor het vervaardigen van een band die een karkas uit een 25 polyurethaanpolymeer en een loopvlakgedeelte uit een rubberpolymeer omvat, welke werkwijze ten minste de volgende stappen omvat van: (A) het verschaffen van een karkas uit een samenstelling die ten minste een polyisocyanaat, een polyol en een katalysator omvat; (B) het verschaffen van een loopvlakgedeelte uit een rubberpolymeer, dat een 30 carbonzuuranhydride-houdende verbinding omvat; (C) het samenbrengen van het karkas en het loopvlakgedeelte; (F) en het polymeriseren van ten minste het loopvlakgedeelte bij een geschikte temperatuur.12. Method of manufacturing a tire comprising a carcass from a polyurethane polymer and a tread portion from a rubber polymer, which method comprises at least the following steps of: (A) providing a carcass from a composition comprising at least one polyisocyanate , a polyol and a catalyst; (B) providing a tread portion from a rubber polymer comprising a carboxylic acid anhydride-containing compound; (C) joining the carcass and the tread portion; (F) and polymerizing at least the tread portion at a suitable temperature.

13. Werkwijze volgens conclusie 12, met het kenmerk dat het loopvlakgedeelte wordt verkregen door carbonzuuranhydride-bevattende rubber oligomeren in te mengen in een rubber, desgewenst andere toeslagstoffen in te mengen, en de aldus gevormde rubbersamenstelling ten minste gedeeltelijk te vulkaniseren 513. A method according to claim 12, characterized in that the tread portion is obtained by blending carboxylic anhydride-containing rubber oligomers into a rubber, blending in other additives if desired, and at least partially vulcanizing the rubber composition thus formed.

14. Werkwijze volgens conclusie 13, met het kenmerk dat ten opzichte van het gewicht van het mbber tussen 5 en 25 gew.-% carbonzuuranhydride-bevattende mbber oligomeren worden ingemengd in het rubber.A method according to claim 13, characterized in that, relative to the weight of the mbber, between 5 and 25% by weight of carboxylic anhydride-containing mbber oligomers are mixed into the rubber.