Novolac resins, process for preparing them and uses thereof

Details Novolac resins, process for preparing them and uses thereof Novolac resins, process for preparing them and uses thereof

2006-11-14

2006-11-14

Yoon, Tae H. (Department: 1714)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From aldehyde or derivative thereof as reactant

C528S137000, C528S159000, C528S219000

Reexamination Certificate

active

07135539

ABSTRACT:
The present invention relates to novel novolac resins obtained by coupling at least one aromatic compound (A) comprising at least two hydroxyl groups and at least one aldehyde (B) in the presence of an acid catalyst and in the presence of water and/or an organic solvent, followed by a step of alkylating the coupling resin thus obtained with at least one unconjugated diene (C), preferably containing no indene. These novolac resins are advantageously used in vulcanized and crosslinked elastomeric compositions since their viscosity, which is lower than that of the resins of the prior art, allows them to be handled easily. They are also used as adhesion promoters for improving the adhesion of rubber to reinforcing materials such as organic fibres made in particular of rayon, polyesters, polyamides or aramids, and metal cords made of steel, in particular brass steel or galvanized steel.

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Le Bras, Jean; Piccini, Ivan; Direct Reinforcement of Natural Rubber Latex Mixes, Industrial and Engineering Chemistry, Feb. 1951, pp. 381-386, vol. 43, No. 2.

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