Sulphur-crosslinkable rubber mixture, vulcanisate of the rubber mixture, and vehicle tyre
AssigneeContinental Reifen Deutschland GmbH
InventorChristian Weber
Life of this patent
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Abstract
A sulfur-crosslinkable rubber mixture, to the vulcanizate thereof, and to a vehicle tire. The sulfur-crosslinkable rubber mixture comprises at least the following constituents: 50 to 100 phr of natural polyisoprene (NR), 0 to 50 phr of at least one further diene rubber, 5 to 80 phr of at least one rubber regenerate produced using at least one regenerating agent selected from the group consisting of dithiophosphoryl polysulfides and silanes having a polysulfane group from a rubber mixture produced in an internal mixer, where the rubber mixture includes at least 50% by weight of comminuted treads of radial HGV tires and/or radial bus tires, 1 to 30 phr of at least one tackifier resin, and 50 to 100 phr of at least one filler.
Claims19
A sulfur-crosslinkable rubber mixture comprising at least the following constituents:
- 50 to 100 phr (parts by weight, based on 100 parts by weight of all rubbers in the mixture) of natural polyisoprene (NR),
- 0 to 50 phr of at least one further diene rubber,
- 5 to 80 phr of at least one rubber regenerate produced using at least one regenerating agent selected from the group consisting of dithiophosphoryl polysulfides and silanes having a polysulfane group from a rubber mixture produced in an internal mixer, where the rubber mixture includes at least 50% by weight of comminuted treads of radial heavy goods vehicle (HGV) tires and/or radial bus tires,
- 1 to 30 phr of at least one tackifier resin, and
- 50 to 100 phr of at least one filler.
A vehicle tire comprising a vulcanizate in at least one component, the vulcanizate obtained from a sulfur-crosslinkable rubber mixture comprising:
- 60 to 90 phr (parts by weight, based on 100 parts by weight of all rubbers in the mixture) of natural polyisoprene (NR),
- 10 to 40 phr of at least one further diene rubber, which is butadiene rubber (BR),
- 5 to 40 phr of at least one rubber regenerate obtained from a mixture including at least one regenerating agent and at least 70% by weight of comminuted treads of radial heavy goods truck tires and/or radial bus tires, wherein the at least one regenerating agent includes bis(O,O-2-ethylhexylthiophosphoryl) polysulfide and/or (bis(triethoxysilyl)propyltetrasulfane (TESPT)),
- 2.5 to 10 phr of at least one tackifier resin selected from the group consisting of aliphatic hydrocarbon resins, phenolic resins, terpene resins, terpene-phenol resins, AMS resins, coumarone-indene resins, and rosin resins, and
- 50 to 100 phr of at least one filler, wherein the at least one filler includes 10 to 30 phr of silica and 20 to 80 phr of carbon black.
A method of producing a sulfur-crosslinkable rubber mixture suitable for a tire component, the method comprising:
- (i) obtaining at least one rubber regenerate by mixing at least one regenerating agent and at least 50% by weight of comminuted treads of radial heavy goods vehicle tires and/or radial bus tires, wherein the at least one regenerating agent is selected from the group consisting of dithiophosphoryl polysulfides and silanes having a polysulfane group;
- and
- (ii) mixing 5 to 80 phr of the at least one rubber regenerate with at least the following constituents:
- 50 to 100 phr (parts by weight, based on 100 parts by weight of all rubbers in the mixture) of natural polyisoprene (NR),
- 0 to 50 phr of at least one further diene rubber,
- 1 to 30 phr of at least one tackifier resin, and
- 50 to 100 phr of at least one filler.
Dependencies are inferred from the claim text.