OVERBASED CALIXARATES,PROCESS FOR THEIR PRODUCTION,COMPOSITIONS CONTAINING THEM AND USE AS LUBRICATING OIL ADDITIVES

摘要

Non-sulphurised overbased metal salts of sulphur-free calixarenes having a substituent hydroxyl group or groups available for reaction with metal base and their preparation are claimed. The salts are useful as additives to lubricating oils by reason of their acids neutralisation capability, their detergent and their antioxidant properties.