Metzeler Kautschuk Gmbh

Klaus Thiel

Walter Brachmann

Jochen Schnetger

Horst Kornau

Roland Stecher

A vulcanizable rubber mixture which will give the desired properties of leather-hard rubber and can also be extruded with a mixture which gives soft rubber. The composite profile from the extrusion has an area of leather-hard rubber and an area of soft rubber. The composite profile is heated by hot air and/or uhf radiation to 180.degree. to 280.degree. C. and the vulcanized profile cooled very rapidly to 10.degree. to 50.degree. C.

Vulcanizable rubber mixture and vulcanizing process for such a rubber

A vulcanizable rubber mixture for producing a leather-hard rubber, which mixture is suitable for use in making a composite profile produced by simultaneous extrusion and vulcanization of two different grades of rubber. The composite profile has a region of leather-hard rubber which serves as the clamping part, and a second zone made integrally therewith, of ordinary soft, rubber-elastic rubber. The vulcanizable rubber mixture for producing a leather-hard mixture contains 20 to 40 parts by weight of polar rubber, i.e. rubber which splits off acid groups under vulcanizing conditions, e.g. polychloroprene, and 60 to 80 parts non-polar rubber, i.e. will not split off said groups, e.g. nitrile rubber, 15 to 50 parts phenolformaldehyde reinforcement resin, 0.5 to 4 parts hexamethylene tetramine, and 0.5 to 3 parts sulfur. Conventional accelerators and zinc oxide are added. Excessive pore formation during the vulcanizing is repressed by the addition of the polar rubber which splits off acid groups under vulcanizing conditions. Other excellent properties are increased toughness in cutting and stamping, reduced splintering, low shrinkage, good injectability, and insignificant production of sulfur dioxide.

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Lindau, Germany

Klaus Thiel