Lubricant compositions for autotraction
AssigneeAgip Petroli S.p.A.
InventorsGiuseppe Fisicaro, Giampaolo Gerbaz
Life of this patent
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Abstract
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.
Claims19
A lubricant comprising:
- a) from 0 to 90% by weight of a mineral base oil;
- b) from 0 to 90% by weight of a synthetic base oil;
- c) from 5 to 50% by weight of a long-chain dialkyl carbonate;
- d) from 6 to 12% by weight of usual additives;
- and
- e) from 0 to 15% by weight of additives which raise the viscosity index and lower the pour point of the lubricant;
- wherein the long-chain dialkyl carbonate is the transesterification product of a lower dialkyl carbonate with an alcoholic mixture consisting of at least 98% by weight of branched aliphatic alcohols having the formula:
- ##STR2## where m is a whole number and n is zero or a whole number and where the total number of carbon atoms in the alcohol is 13 to 16.
A lubricant comprising:
- a) 43% by weight of a mineral oil base;
- b) 10% by weight of a synthetic base oil;
- c) 30% by weight of a long-chain dialkyl carbonate which is the transesterification product of a lower dialkyl carbonate with an alcoholic mixture consisting of at least 98% by weight of branched aliphatic alcohols having the formula:
- ##STR3## where m is a whole number and n is zero or a whole number and where the total number of carbon atoms in the alcohol is from 13 to 16;
- d) 9% by weight of usual additives;
- and
- e) 8% by weight of additives which are able to raise the viscosity index and lower the pour point of the lubricant.
Dependencies are inferred from the claim text.