Continental Reifen Deutschland Gmbh

Thomas Völker

Carla Recker

Andreas Tyburski

Carola Schroeder

Dieter Jeromin

Joe Guardalabene

Markus Dahlke

Martin Convey

Tobias Ruckert

Hilke Wolf

Konstantin Efimov

Nils Krüger

Shreyas Naik

Fei Liu

Inga Soetbeer

Lena MÜLLER

Marson Kwan

Endres Borchardt

Tim Rennmann

The invention relates to a process for devulcanizing a vulcanized rubber mixture, comprising the following steps: A) providing or producing a vulcanized rubber mixture, B) comminuting the vulcanized rubber mixture to a granular material composed of vulcanized rubber particles, where the vulcanized rubber particles have a maximum particle diameter of 100 mm, C) extruding the vulcanized rubber particles produced in step B) in a twin-screw extruder at a shear rate of less than 100 s, where the temperature of the vulcanized rubber particles during extrusion is less than 200° C., to give a devulcanized rubber mixture having a temperature above 100° C., D) cooling the devulcanized rubber mixture in a further kneading unit, so as to give a devulcanized rubber mixture having a temperature in the range from 50° C. to 100° C. The invention further relates to an apparatus for performing the process and to the use of the apparatus for devulcanization of a vulcanized rubber mixture.

Method for the devulcanization of a vulcanized rubber mixture, device for carrying out the method and use of the device for the devulcanization of a vulcanized rubber mixture

Self-sealing tire sealants are provided which contain fragments and/or residues of expanded solids, where the solids are selected from the group containing expandable graphite and microspheres. In some aspects, the microspheres include at least isobutane and/or isopentane as blowing agents. The microspheres may also have a shell containing at least one polymer, and in some cases the polymer is at least one copolymer of acrylonitrile and methyl acrylate. The self-sealing tire sealant may further include graphene structures. In some aspects the interior of a pneumatic vehicle tire has the self-sealing tire sealant disposed on the inner surface, opposite the tire tread, and the layer thickness of the tire sealant may be from 0.5 to 8 mm.

Self-sealing tire sealant and pneumatic vehicle tire

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Seelze, Germany

Thomas Völker