US4292462A
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Liquid dielectric compositions comprising bromochlorobenzene/polychlorobenzene admixtures
Assignee: Rhone Poulenc Industries SA
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Filing: 1980-03-18
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Granted: 1981-09-29
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Expires: 2000-03-18
Abstract
Abstract Liquid, non-flammable dielectric compositions especially adapted as insulators/coolants for transformers and the like, are comprised of an admixture of [i] a bromochlorobenzene and [ii] a polychlorobenzene, and, optionally, [iii] a diluent therefor.
Inventors
- 👤 Bruno Rey-Coquais
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:52
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/20; H01B3/24
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
35 words
A liquid, non-flammable dielectric composition, comprising (i) a bromochlorobenzene fraction, and (ii) a polychlorobenzene fraction including a member selected from the group consisting of at least one trichlorobenzene, at least one tetrachlorobenzene, and admixtures thereof.
Claim 2
Dependent Claim
35 words
A liquid, non-flammable dielectric composition, comprising (i) a bromochlorobenzene fraction, and (ii) a polychlorobenzene fraction including a member selected from the group consisting of at least one trichlorobenzene, at least one tetrachlorobenzene, and admixtures thereof.
Claim 3
Dependent Claim
48 words
The dielectric composition as defined by claim 1, said bromochlorobenzene fraction (i) comprising at least one bromochlorobenzene having the structural formula: ##STR4## in which m and n, which are identical or different, are integers equal to 1 or 2, and the sum m+n is no greater than 3.
Claim 4
Dependent Claim
29 words
The dielectric composition as defined by claim 2, said at least one bromochlorobenzene being selected from the group consisting of 1-bromo-2-chlorobenzene, 1-bromo-3-chlorobenzene, 1-bromo-4-chlorobenzene, 1,2-dibromo-3-chlorobenzene, 1,2-dibromo-4-chlorobenzene, 1,3-dibromo-2-chlorobenzene, 1,3-dibromo-5-chlorobenzene and 2-bromo-1,3-dichlorobenzene.
Claim 5
Dependent Claim
21 words
The dielectric composition as defined by claim 2, said at least one bromochlorobenzene comprising a mixture of 1-bromo-2-chlorobenzene, 1-bromo-3-chlorobenzene and 1-bromo-4-chlorobenzene.
Claim 6
Dependent Claim
27 words
The dielectric composition as defined by claim 2, said polychlorobenzene fraction (ii) comprising at least one polychlorobenzene selected from the group consisting of 1,2,3-trichlorobenzene, 1,2,4-trichlorobenzene and 1,2,3,4-tetrachlorobenzene.
Claim 7
Dependent Claim
20 words
The dielectric composition as defined by claim 2, said polychlorobenzene fraction (ii) comprising a eutectic mixture of 1,2,3-trichlorobenzene and 1,2,4-trichlorobenzene.
Claim 8
Dependent Claim
22 words
The dielectric composition as defined by claim 2, said polychlorobenzene fraction (ii) comprising a ternary eutectic mixture of 1,2,3-trichlorobenzene, 1,2,4-trichlorobenzene and 1,2,3,4-tetrachlorobenzene.
Claim 9
Dependent Claim
18 words
The dielectric composition as defined by claim 2, said polychlorobenzene fraction (ii) further comprising at least one dichlorobenzene.
Claim 10
Dependent Claim
26 words
The dielectric composition as defined by claim 8, said at least one dichlorobenzene being selected from the group consisting of 1,2-dichlorobenzene, 1,3-dichlorobenzene, 1,4-dichlorobenzene, and admixtures thereof.
Claim 11
Dependent Claim
25 words
The dielectric composition as defined by claim 8, said at least one dichlorobenzene comprising from about 2 to 25% by weight of said polychlorobenzene fraction.
Claim 12
Dependent Claim
34 words
The dielectric composition as defined by claim 2, said bromochlorobenzene fraction (i) comprising from about 5 to 35% by weight thereof, and said polychlorobenzene fraction (ii) from about 95 to 65% by weight thereof.
Claim 13
Dependent Claim
61 words
The dielectric composition as defined by claims 1 or 10, further comprising a diluent (iii) selected from the group consisting of biphenyl, monoalkylbiphenyl, polyalkylbiphenyl, terphenyl, monoalkylterphenyl, polyalkylterphenyl, at least partially hydrogenated biphenyl, at least partially hydrogenated terphenyl, monoalkylbenzene, polyalkylbenzene, diphenyl- and polyphenylalkanes wherein the aliphatic radical contains from about 1 to 10 carbon atoms, phthalate, and natural or synthetic aliphatic oil.
Claim 14
Dependent Claim
102 words
The dielectric composition as defined by claim 12, said diluent (iii) comprising an alkylbiphenyl having the structural formula: ##STR5## in which R 1 and R 2 represent linear or branched chain alkyl radicals which are identical or different and contain from 1 to 5 carbon atoms, and n 1 and n 2 , which are identical or different, represent 0 or an integer ranging from 1 to 3, with the proviso that at least one of the indices n 1 and n 2 is equal to at least 1 and that the sum n 1 +n 2 is no greater than 5.
Claim 15
Dependent Claim
113 words
The dielectric composition as defined by claim 12, said diluent (iii) comprising an alkylterphenyl having the structural formula: ##STR6## in which R 1 , R 2 and R 3 represent linear or branched chain alkyl radicals which are identical or different and contain from 1 to 5 carbon atoms, and n 1 , n 2 and n 3 , which are identical or different, represent 0 or an integer ranging from 1 to 3, with the proviso that at least one of the indices n 1 , n 2 and n 3 is equal to at least 1 and that the sum n 1 +n 2 +n 3 is no greater than 4.
Claim 16
Dependent Claim
17 words
The dielectric composition as defined by claim 13, the diluent (iii) comprising an admixture of such alkylbiphenyls.
Claim 17
Dependent Claim
17 words
The dielectric composition as defined by claim 14, the diluent (iii) comprising an admixture of such alkylterphenyls.
Claim 18
Dependent Claim
15 words
The dielectric composition as defined by claim 12, the diluent (iii) comprising biphenyl, per se.
Claim 19
Dependent Claim
15 words
The dielectric composition as defined by claim 12, the diluent (iii) comprising terphenyl, per se.
Claim 20
Dependent Claim
34 words
The dielectric composition as defined by claim 15, the degree of alkylation of the admixture comprising the diluent (iii), expressed as the number of alkyl groups per molecule of biphenyl, being at least 0.5.
Claim 21
Dependent Claim
34 words
The dielectric composition as defined by claim 16, the degree of alkylation of the admixture comprising the diluent (iii), expressed as the number of alkyl groups per molecule of terphenyl, being at least 0.5.
Claim 22
Dependent Claim
29 words
The dielectric composition as defined by claim 13, R 1 and R 2 being selected from the group consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec.-butyl, and t-butyl.
Claim 23
Dependent Claim
32 words
The dielectric composition as defined by claim 14, R 1 , R 2 and R 3 being selected from the group consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec.-butyl and t-butyl.
Claim 24
Dependent Claim
26 words
The dielectric composition as defined by claim 12, said diluent (iii) comprising at least partially hydrogenated biphenyl having a degree of hydrogenation of at least 10%.
Claim 25
Dependent Claim
26 words
The dielectric composition as defined by claim 12, said diluent (iii) comprising at least partially hydrogenated terphenyl having a degree of hydrogenation of at least 10%.
Claim 26
Dependent Claim
46 words
The dielectric composition as defined by claim 12, said diluent (iii) comprising a phthalate having the structural formula: ##STR7## in which R 4 and R 5 , which are identical or different, represent linear or branched chain alkyl radicals having from 3 to 10 carbon atoms.
Claim 27
Dependent Claim
19 words
The dielectric composition as defined by claim 25, both R 4 and R 5 being branched in the 2-position.
Claim 28
Dependent Claim
12 words
The dielectric composition as defined by claim 26, said phthalate being di(2-ethylhexyl)phthalate.
Claim 29
Dependent Claim
13 words
The dielectric composition as defined by claim 12, said diluent (iii) comprising polybutene.
Claim 30
Dependent Claim
15 words
The dielectric composition as defined by claim 12, said diluent (iii) comprising a paraffin oil.
Claim 31
Dependent Claim
17 words
The dielectric composition as defined by claim 12, having a hydrogen index iH of less than 0.003.
Claim 32
Dependent Claim
27 words
The dielectric composition as defined by claim 12, said diluent (iii) comprising up to 30% by weight of the total weight of the fractions (i) and (ii).
Claim 33
Dependent Claim
27 words
The dielectric composition as defined by claim 31, said diluent (iii) comprising at least 3% by weight of the total weight of the fractions (i) and (ii).
Claim 34
Dependent Claim
13 words
The dielectric composition as defined by claim 12, further comprising a sequestering agent.
Claim 35
Dependent Claim
16 words
The dielectric composition as defined by claim 33, wherein the sequestering agent is an epoxy compound.
Claim 36
Dependent Claim
30 words
The dielectric composition as defined by claim 34, wherein the epoxy compound is a compound selected from the group consisting of propylene oxide, glycidyl ethers, styrene oxide, 1,3-bis-(2,3-epoxy-propoxy)-benzene and di(2-ethylhexyl)-4,5-epoxy-tetrahydrophthalate.
Claim 37
Dependent Claim
18 words
In a transformer, the improvement which comprises insulation/coolant material comprising the dielectric composition as defined by claim 12.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |