FIELD: production of rubber mixture. SUBSTANCE: novolac alkyl phenol-formaldehyde resin is prepared by condensation of monoalkyl phenol with formaldehyde. At the first step the process takes place at boiling point of the mixture in the presence of triethyl amine as base catalyst. At the second step the process is carried out in the presence of oxalic acid as acid catalyst, simultaneously with dehydration of the resin. EFFECT: decreased duration of the process and amount of industrial wastes. 2 tbl
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