Agip Petroli

Giampaolo Gerbaz

Paolo Koch

Luigi Imparato

Luciano Mattei

Giuseppe Fisicaro

Enrico Betta

A lubricant composition comprises: a) a mineral base oil; b) a synthetic base oil; c) a long-chain dialkyl carbonate; d) a parcel of usual additives; and e) viscosity index and pour point improvement additives. Component c) is the product of transesterification of a lower dialkyl carbonate with an alcoholic mixture consisting of at least 98% by weight of aliphatic alcohols with a linear or essentially linear hydrocarbon chain carrying a --CH.sub.2 --OH group on a non-terminal carbon atom, the total number of carbon atoms in the molecule varying from 10 to 18 and preferably from 13 to 16.

Lubricant compositions for autotraction

Dispersing additives for lubricating fluids are disclosed, which contain the oxazoline function and are prepared by reacting amino alcohols with mono or bicarboxylic linear or branched chain aliphatic acids having from 2 to 51 carbon atoms. These additives are characterized by a very high dispersing power which makes them particularly suitable for engines used in stop-and-go service.

Dispersing additives for lubricants, and the method for their preparation

A process for preparing viscosity index improvers for lubricating oils consisting of thermally cracking a solution of an olefin copolymer in mineral oil at a temperature of between 250.degree. C. and 350.degree. C. in an inert atmosphere said solution containing free radical scavengers.

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Milan, Italy

Giampaolo Gerbaz