US4324933A — Electrical insulating oil compositions

Claim 1

Independent Claim 273 words

An electrical insulating oil composition consisting essentially of (I) 50-85 parts by weight of a mixed or paraffinic base crude oil-derived electrical insulating oil having a sulphur content of not higher than 0.35 wt.% and being obtained by the steps of: refining with a solvent a distillate boiling within the range of 230° to 430° C. at atmospheric pressure, the distillate being obtained by distillation of a mixed or paraffinic base crude oil at atmospheric pressure or by distillation at a reduced pressure of a residual oil produced by distillation of the crude oil at atmospheric pressure, to obtain a raffinate, hydrofining the thus obtained raffinate and solvent dewaxing the thus hydrofined raffinate, (II) 50-15 parts by weight of a naphthenic base crude oil-derived insulating oil, and (III) of 0.001-1.0% by weight of a hydrocarbon derived pour point depressant, based on the total weight of the oils (I) and (II), selected from the group consisting of (1) copolymers of ethylene and α-olefin having the general formula CH 2 ═CH--R wherein R is an alkyl group having at least one carbon atom, (2) polymers of α-olefin having the general formula CH 2 ═CH--R wherein R is any one of C 7-18 alkyl groups which are identical with, or different from, each other, the polymers containing -CH 2 -- n wherein n is at least 6, (3) styrene-butadiene copolymers in hydrogenated form, and (4) alkylated polystyrenes obtained by the reaction of a polystyrene having a number average molecular weight of 10,000-150,000 with an alkyl halide of the formula RX wherein R is an alkyl group having 6-20 carbon atoms and X is a halogen atom.

Claim 2

Dependent Claim 273 words

An electrical insulating oil composition consisting essentially of (I) 50-85 parts by weight of a mixed or paraffinic base crude oil-derived electrical insulating oil having a sulphur content of not higher than 0.35 wt.% and being obtained by the steps of: refining with a solvent a distillate boiling within the range of 230° to 430° C. at atmospheric pressure, the distillate being obtained by distillation of a mixed or paraffinic base crude oil at atmospheric pressure or by distillation at a reduced pressure of a residual oil produced by distillation of the crude oil at atmospheric pressure, to obtain a raffinate, hydrofining the thus obtained raffinate and solvent dewaxing the thus hydrofined raffinate, (II) 50-15 parts by weight of a naphthenic base crude oil-derived insulating oil, and (III) of 0.001-1.0% by weight of a hydrocarbon derived pour point depressant, based on the total weight of the oils (I) and (II), selected from the group consisting of (1) copolymers of ethylene and α-olefin having the general formula CH 2 ═CH--R wherein R is an alkyl group having at least one carbon atom, (2) polymers of α-olefin having the general formula CH 2 ═CH--R wherein R is any one of C 7-18 alkyl groups which are identical with, or different from, each other, the polymers containing -CH 2 -- n wherein n is at least 6, (3) styrene-butadiene copolymers in hydrogenated form, and (4) alkylated polystyrenes obtained by the reaction of a polystyrene having a number average molecular weight of 10,000-150,000 with an alkyl halide of the formula RX wherein R is an alkyl group having 6-20 carbon atoms and X is a halogen atom.

Claim 3

Dependent Claim 22 words

An electrical insulating oil composition according to claim 1, wherein the electrical insulating oil (I) is further treated with a solid adsorbent.

Claim 4

Dependent Claim 91 words

An electrical insulating oil composition according to claim 1, wherein the naphthenic base crude oil-derived insulating oil (II) is one boiling within the range of 250° to 400° C. and being obtained by the steps of: hydrofining a distillate boiling within the range of 250° to 400° C. obtained by distillation of a naphthenic base crude oil at atmospheric pressure or by distillation at a reduced pressure of a residual oil obtained by distillation of the crude oil at atmospheric pressure, and treating the thus hydrofined distillate with a solid adsorbent.

Claim 5

Dependent Claim 155 words

An electrical insulating oil composition according to claim 3, wherein the hydrocarbon-derived pour point depressant (III) is at least one member selected from the group consisting of (1) copolymers of ethylene and α-olefin having the general formula CH 2 ═CH--R wherein R is an alkyl group having at least one carbon atom, (2) polymers of α-olefin having the general formula CH 2 ═CH--R wherein R is any one of C 7-18 alkyl groups which are identical with, or different from, each other, the polymers containing --CH 2 -- n wherein n is at least 6, (3) styrene-butadiene copolymers in hydrogenated form, (4) condensed alkylnaphthalenes obtained by the condensation of dichloroparaffin and naphthalene and (5) alkylated polystyrenes obtained by the reaction of a polystyrene having a number average molecular weight of 10,000-150,000 with an alkyl halide of the formula RX wherein R is an alkyl group having 6-20 carbon atoms and X is a halogen atom.

Claim 6

Dependent Claim 22 words

An electrical insulating oil composition according to claim 3, wherein the electrical insulating oil (I) is further treated with a solid adsorbent.

Claim 7

Dependent Claim 22 words

An electrical insulating oil composition according to claim 4, wherein the electrical insulating oil (I) is further treated with a solid adsorbent.

Claim 8

Dependent Claim 39 words

An electrical insulating oil composition according to claim 1, wherein the electrical insulating oil (I) is present in an amount of 55-75 parts by weight and insulating oil (II) is present in an amount of 45-25 parts by weight.

Claim 9

Dependent Claim 152 words

The process of providing an improved electrical insulating oil comprising blending: (I) 50-85 parts by weight of a mixed or paraffinic base crude oil-derived electrical insulating oil having a sulphur content of not higher than 0.35 wt.% and being obtained by the steps of: refining with a solvent a distillate boiling within the range of 230° to 430° C. at atmospheric pressure, the distillate being obtained by distillation of a mixed or paraffinic base crude oil at atmospheric pressure or by distillation at a reduced pressure of a residual oil produced by distillation of the crude oil at atmospheric pressure, to obtain a raffinate, hydrofining the thus obtained raffinate, and solvent dewaxing the thus hydrofined raffinate, (II) 50-15 parts by weight of a naphthenic base crude oil-derived insulating oil, and (III) 0.001-1.0% by weight of a hydrocarbon derived pour point depressant, based on the total weight of the oils (I) and (II).

Claim 10

Dependent Claim 152 words

The process of providing an improved electrical insulating oil comprising blending: (I) 50-85 parts by weight of a mixed or paraffinic base crude oil-derived electrical insulating oil having a sulphur content of not higher than 0.35 wt.% and being obtained by the steps of: refining with a solvent a distillate boiling within the range of 230° to 430° C. at atmospheric pressure, the distillate being obtained by distillation of a mixed or paraffinic base crude oil at atmospheric pressure or by distillation at a reduced pressure of a residual oil produced by distillation of the crude oil at atmospheric pressure, to obtain a raffinate, hydrofining the thus obtained raffinate, and solvent dewaxing the thus hydrofined raffinate, (II) 50-15 parts by weight of a naphthenic base crude oil-derived insulating oil, and (III) 0.001-1.0% by weight of a hydrocarbon derived pour point depressant, based on the total weight of the oils (I) and (II).

Claim 11

Dependent Claim 26 words

An electrical insulating oil composition according to claim 1, wherein said distillate is refined with the solvent to remove 30-75 wt.% of the sulphur contained therein.

Claim 12

Dependent Claim 23 words

An electrical insulating oil composition according to claim 1, wherein said raffinate is hydrofined to remove 40-90 wt.% of the sulphur contained therein.

Claim 13

Dependent Claim 27 words

An electrical insulating oil composition according to claim 1, wherein said mixed or paraffinic base crude oil-derived electrical insulating oil has a sulphur content of 0.05-0.35 wt.%.

Claim 14

Dependent Claim 173 words

An electrical insulating oil composition consisting essentially of: (I) 50-85 parts by weight of a mixed-base crude oil-derived electrical insulating oil having a sulphur content of not higher than 0.35 wt.% and being obtained by the steps of: refining with furfural a distillate boiling at 260°-380° C. at atmospheric pressure, the distillate being obtained by distillation of crude oil at atmospheric pressure and then by distillation at reduced pressure of the residual oil from the first distillation, to obtain a raffinate, hydrofining the thus obtained raffinate and solvent dewaxing the thus hydrofined raffinate; (II) 50-15 parts by weight of a naphthenic base crude oil-delivered insulating oil wherein the latter boils within the range of 280° to 390° C. and is obtained by: hydrofining a distillate boiling within said latter range obtained by distillation of crude oil at atmospheric pressure, and treating the thus hydrofined distillate with activated clay; and (III) 0.001--1.0% by weight of an amorphous ethylene-prophylene copolymer with an average molecular weight of about 36,000 and a propylene content of 40 mol.%.

Claim 15

Dependent Claim 173 words

An electrical insulating oil composition consisting essentially of: (I) 50-85 parts by weight of a mixed-base crude oil-derived electrical insulating oil having a sulphur content of not higher than 0.35 wt.% and being obtained by the steps of: refining with furfural a distillate boiling at 260°-380° C. at atmospheric pressure, the distillate being obtained by distillation of crude oil at atmospheric pressure and then by distillation at reduced pressure of the residual oil from the first distillation, to obtain a raffinate, hydrofining the thus obtained raffinate and solvent dewaxing the thus hydrofined raffinate; (II) 50-15 parts by weight of a naphthenic base crude oil-delivered insulating oil wherein the latter boils within the range of 280° to 390° C. and is obtained by: hydrofining a distillate boiling within said latter range obtained by distillation of crude oil at atmospheric pressure, and treating the thus hydrofined distillate with activated clay; and (III) 0.001--1.0% by weight of an amorphous ethylene-prophylene copolymer with an average molecular weight of about 36,000 and a propylene content of 40 mol.%.

Claim 16

Dependent Claim 195 words

An electrical insulating oil composition consisting essentially of: (I) 50-85 parts by weight of a mixed-base crude oil-derived electrical insulating oil having a sulphur content of not higher than 0.35 wt.% and being obtained by the steps of: refining the furfural a distillate boiling at 260°-380° C. at atmospheric pressure, the distillate being obtained by distillation of crude oil at atmospheric pressure and then by distillation at reduced pressure of the residual oil from the first distillation, to obtain a raffinate, hydrofining the thus obtained raffinate and solvent dewaxing the thus hydrofined raffinate; (II) 50-15 parts by weight of a naphthenic base crude oil-delivered insulating oil wherein the latter boils within the range of 280° to 390° C. and is obtained by: hydrofining a distillate boiling within said latter range obtained by distillation of crude oil at atmospheric pressure, and treating the thus hydrofined distillate with activated clay; and (III) 0.001-1.0% by weight of a styrene-butadiene copolymer, with an average molecular weight of about 40,000 and a styrene content of about 32 mol% and which is hydrogenated to the extent that at least 95% of the double bonds of the butadiene units have been hydrogenated.

Claim 17

Dependent Claim 195 words

An electrical insulating oil composition consisting essentially of: (I) 50-85 parts by weight of a mixed-base crude oil-derived electrical insulating oil having a sulphur content of not higher than 0.35 wt.% and being obtained by the steps of: refining the furfural a distillate boiling at 260°-380° C. at atmospheric pressure, the distillate being obtained by distillation of crude oil at atmospheric pressure and then by distillation at reduced pressure of the residual oil from the first distillation, to obtain a raffinate, hydrofining the thus obtained raffinate and solvent dewaxing the thus hydrofined raffinate; (II) 50-15 parts by weight of a naphthenic base crude oil-delivered insulating oil wherein the latter boils within the range of 280° to 390° C. and is obtained by: hydrofining a distillate boiling within said latter range obtained by distillation of crude oil at atmospheric pressure, and treating the thus hydrofined distillate with activated clay; and (III) 0.001-1.0% by weight of a styrene-butadiene copolymer, with an average molecular weight of about 40,000 and a styrene content of about 32 mol% and which is hydrogenated to the extent that at least 95% of the double bonds of the butadiene units have been hydrogenated.

Claim 18

Dependent Claim 179 words

An electrical insulating oil composition consisting essentially of: (I) 50-85 parts by weight of a mixed-base crude oil-derived electrical insulating oil having a sulphur content of not higher than 0.35 wt.% and being obtained by the steps of: refining the furfural a distillate boiling at 260°-380° C. at atmospheric pressure, the distillate being obtained by distillation of crude oil at atmospheric pressure and then by distillation at reduced pressure of the residual oil from the first distillation, to obtain a raffinate, hydrofining the thus obtained raffinate and solvent dewaxing the thus hydrofined raffinate; (III) 50-15 parts by weight of a naphthenic base crude oil-derived insulating oil wherein the latter boils within the range of 280° to 390° C. and is obtained by: hydrofining a distillate boiling within said latter range obtained by distillation of crude oil at atmospheric pressure, and treating the thus hydrofined distillate with activated clay; and (III) 0.001--1.0% by weight of an alkylated polystyrene obtained by reacting a polystyrene with an average molecular weight of about 25,000 with dodecyl chloride in the presence of aluminum chloride.

Claim 19

Dependent Claim 179 words

An electrical insulating oil composition consisting essentially of: (I) 50-85 parts by weight of a mixed-base crude oil-derived electrical insulating oil having a sulphur content of not higher than 0.35 wt.% and being obtained by the steps of: refining the furfural a distillate boiling at 260°-380° C. at atmospheric pressure, the distillate being obtained by distillation of crude oil at atmospheric pressure and then by distillation at reduced pressure of the residual oil from the first distillation, to obtain a raffinate, hydrofining the thus obtained raffinate and solvent dewaxing the thus hydrofined raffinate; (III) 50-15 parts by weight of a naphthenic base crude oil-derived insulating oil wherein the latter boils within the range of 280° to 390° C. and is obtained by: hydrofining a distillate boiling within said latter range obtained by distillation of crude oil at atmospheric pressure, and treating the thus hydrofined distillate with activated clay; and (III) 0.001--1.0% by weight of an alkylated polystyrene obtained by reacting a polystyrene with an average molecular weight of about 25,000 with dodecyl chloride in the presence of aluminum chloride.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1985-04-12	1985-10-12	1986-04-13	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1989-04-12	1989-10-12	1990-04-13	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1993-04-12	1993-10-12	1994-04-13	$7700.00	Window Closed / Lapsed

Electrical insulating oil compositions

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