Solutia Germany Gmbh & Co. Kg

Hoechst Aktiengesellschaft

Vianora Resins Gmbh

Siegfried Wallenwein

Thomas Burkhart

Gerd Walz

Richard Sattelmeyer

Gerhard Brindoepke

Helmut Eckes

Frank Scholl

Use, as modifier resin for rubber mixtures, of novolaks ABC plastified with terpene-type olefinically unsaturated natural substances C, where the ratio of the molar amount of the phenol or phenol derivative B and the molar amount of the natural substance C in the modified novolak is from 1:6 to 6:1, process for increasing the tear propagation resistance and reducing the compression set of rubber vulcanizates by adding these modifier resins to rubber mixtures, and components molded from vulcanizates thus prepared.

Plastified novolaks as additive to rubber mixtures

A process for reducing the heat evolution on dynamic stressing of vulcanised rubber products, using for this purpose, in vulcanizable rubber mixtures, mixtures made from non-selfcuring novolaks A and from unetherified or partially etherified triazine resins B, as a combination of reinforcing resin and curing agent.

Rubber products with low heat build up on mechanical stressing

Urethane-modified novolaks which are prepared by simultaneous reaction of a monohydric or polyhydric phenol (A) with an oxo compound (aldehyde or ketone) (B) and a urethane (C) in the presence of an acidic catalyst (D) at an elevated temperature of 60.degree. to 200.degree. C. and contain no interfering amounts of free starting phenol, and their use as adhesion improvers in rubbers, in particular rubbers containing reinforcing media such as steel cord or textile fibers.

Urethane-modified novolaks for increasing the steel cord adhesion and

Heat-stable moldings for brake linings, clutch linings and grinding tools are produced by molding and vulcanizing a mixture containing a natural or synthetic rubber in the presence of a sulfur-free vulcanizer/activator system comprising phenol resols which contain at least 90 mol % of p-(C.sub.3 -C.sub.12)-alkylphenols, based on the total amount of phenols, and a substance, or mixture of substances, which acts as a Bronsted or Lewis acid under the reaction conditions of the rubber-vulcanization, at a temperature of 120.degree. to 250.degree. C.

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Buettelborn, Germany

Siegfried Wallenwein