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US 7,846,882 B2Granted
Electrical oil formulation
AssigneeShell Oil Company
InventorsAndree Hilker, Volker Klaus Null
Life of this patent
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Abstract
Electrical oil formulation comprising a base oil component and an additive, wherein (i) at least 80 wt % of the base oil component is a paraffin base oil having a paraffin content of greater than 80 wt % paraffins and a saturates content of greater than 98 wt % and comprising a series of iso-paraffins having n, n+1, n+2, n+3 and n+4 carbon atoms and wherein n is between 20 and 35; and (ii) an anti-oxidant additive; wherein the base oil component has a flash point of at least 170° C., as determined by ISO 2592.
Claims13
An electrical oil formulation consisting essentially of:
- (i) at least 80 wt % of a base oil component comprising a paraffinic base oil having a paraffin content of greater than 80 wt % paraffins and a saturates content of greater than 98 wt % and comprising a series of iso-paraffins having n, n+1, n+2, n+3 and n+4 carbon atoms and wherein n is between 20 and 35;
- (ii) an phenolic or amine anti-oxidant additive;
- (iii) an aromatic anti-gassing compound;
- (iv) a copper passivator additive;
- and
- (v) a sulphur or phosphorus containing additive;
- wherein the base oil component has a flash point of at least 170° C., as determined by ISO 2592;
- wherein the paraffinic base oil is obtained by hydroisomerisation of a Fischer-Tropsch derived wax, followed by dewaxing;
- and
- wherein the formulation comprises between 0.05 and 10 wt % of an aromatic anti-gassing compound selected from the group consisting of:
- tertrahydronaphthalene, diethylbenzene, di-isopropylbenzene, mixtures of alkylbenzenes, and mixtures of 2,6-di-t-butyl phenol and 2,6-di-t-butyl cresol.
8 more elements
Dependencies are inferred from the claim text.