Phenol/diene novolok resins, process, preparation and...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

18/183, 402/48,

C08G 61/02 (2006.01) C08G 8/20 (2006.01) C08L 7/00 (2006.01) C08L 9/00 (2006.01) C08L 11/00 (2006.01) C08L 21/00 (2006.01)

Patent

CA 2201389

The purpose of the invention is novolak resins obtained by condensation (A) of an aromatic compound containing at least two hydroxyl groups and (B) a non-conjugated diene in a molar relationship (A) (B) between 0.7 and 1.75, in the presence of an acid catalyst, characterized by a free aromatic compound of less than 5% by weight of the novolak resins with 0 parts of rubber by weight. These rubber-based resins or compounds are for use in vulcanization, particularly in tires and conveyor belts.

L'invention a pour objet des résines novolaques obtenues par condensation (A) d'un composé aromatique renfermant au moins deux groupes hydroxyles et (B) d'un diène non conjugué dans un rapport molaire (A)/(B) compris entre 0,7 et 1,75 en présence d'un catalyseur acide, caractérisées en ce que la teneur en composé aromatique libre est inférieure à 5% en poids. L'invention a aussi pour objet un procédé de préparation de ces résines et des compositions à base de caoutchouc comprenant de 0,5 à 20 parties en poids des résines novolaques précitées pour loO parties en poids de caoutchouc. Ces résines ou compositions à base de caoutchouc sont utilisables dans le domaine de la vulcanisation, notamment des pneumatiques et des bandes transporteuses.

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