Patent US4223071A successfully refreshed from Google Patents.
US4223071A
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High voltage insulating compositions containing phosphorus compounds
Assignee: Raychem Corp
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Filing: 1978-01-13
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Granted: 1980-09-16
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Expires: 1998-01-13
Abstract
Abstract New high voltage insulating compositions are disclosed. The compositions comprise a polymer (e.g. a polysiloxane, epoxide resin or a polymer of one or more olefins or substituted olefins), an antitracking additive (e.g. an alumina hydrate), and certain phosphorus-containing compounds which have been found to provide the compositions with greatly improved resistance to erosion by high voltage stress. The phosphorus-containing compounds include phosphonates, phosphates, phosphites, phosphinates, phosphonites, phosphinites, phosphine oxides and sulfides, and phosphines, and salts and complexes thereof. The phosphorus-containing compound can react in situ with the polymer or other ingredients of the composition.
Inventors
- 👤 Nicodemus E. Boyer
- 👤 II Travers K. Cammack
- 👤 David D. Nyberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:08
CPC Classifications
C; C08; C08K; C08K13/00; C08K13/02; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B7/00; H01B7/17; H01B7/28; H01B7/2813; Y; Y10; Y10S; Y10S174/00; Y10S174/02
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
148 words
A high voltage insulating composition comprising (1) a polymer; (2) an anti-tracking additive effective in reducing tracking; and (3) a phosphorus-containing compound effective in improving the resistance of the composition to erosion by high voltage stress, said compound being selected from (a) complexes of a metal salt wherein the metal is a transition metal other than copper, and a compound having a formula selected from ##STR13## wherein t is 1; p is integer greater than 1; X is independently selected from oxygen and sulphur; L is an --R group; one of the Q groups is an --R group and the other Q group is an R group or an --XR group; and R is independently selected from hydrogen atoms and organic groups; and (b) reaction products derived from the reaction of at least one said complex in the presence of the polymer to form higher molecular weight products.
Claim 2
Dependent Claim
148 words
A high voltage insulating composition comprising (1) a polymer; (2) an anti-tracking additive effective in reducing tracking; and (3) a phosphorus-containing compound effective in improving the resistance of the composition to erosion by high voltage stress, said compound being selected from (a) complexes of a metal salt wherein the metal is a transition metal other than copper, and a compound having a formula selected from ##STR13## wherein t is 1; p is integer greater than 1; X is independently selected from oxygen and sulphur; L is an --R group; one of the Q groups is an --R group and the other Q group is an R group or an --XR group; and R is independently selected from hydrogen atoms and organic groups; and (b) reaction products derived from the reaction of at least one said complex in the presence of the polymer to form higher molecular weight products.
Claim 3
Dependent Claim
20 words
A composition according to claim 1 wherein the anti-tracking additive is selected from alumina, alumina hydrates, magnesia and magnesia hydrates.
Claim 4
Dependent Claim
24 words
A composition according to claim 1 which contains an amount of at least 0.25% by weight of said phosphorus-containing compound and moieties derived therefrom.
Claim 5
Dependent Claim
15 words
A composition according to claim 3 wherein the amount is 0.25% to 5% by weight.
Claim 6
Dependent Claim
22 words
A composition according to claim 1 wherein at least one of the R groups is selected from phenyl and substituted phenyl groups.
Claim 7
Dependent Claim
70 words
A composition according to claim 1 wherein at least one of the R groups is selected from aryl groups, substituted aryl groups in which each of the substituents is an electron-attracting group; substituted aryl groups in which the substituents contain a total of at least six carbon atoms; and alkyl groups which together with the other R groups contain a total number of carbon atoms which is at least 45.
Claim 8
Dependent Claim
33 words
A composition according to claim 1 wherein t is 1, L is an --R group, one of the Q groups is an --R group and the other Q group is an --XR group.
Claim 9
Dependent Claim
18 words
A composition according to claim 1 wherein each of L and the Q groups is an --R group.
Claim 10
Dependent Claim
19 words
A composition according to claim 1 wherein the phosphorus-containing compound is a complex of nickelous chloride and phenyl diphenylphosphonite.
Claim 11
Dependent Claim
41 words
A composition according to claim 1 wherein the polymer (1) is selected from the group consisting of polysiloxanes, epoxide resins and polymers which consist essentially of units derived from at least one ethylenically unsaturated compound selected from olefins and substituted olefins.
Claim 12
Dependent Claim
12 words
A composition according to claim 10 wherein the polymer (1) is cross-linked.
Claim 13
Dependent Claim
17 words
A composition according to claim 1 which also contains up to 1% by weight of carbon black.
Claim 14
Dependent Claim
15 words
A composition according to claim 1 which is in the form of a recoverable article.
Claim 15
Dependent Claim
20 words
Insulated electrical apparatus in which at least a part of the insulation is a composition as claimed in claim 1.
Claim 16
Dependent Claim
27 words
Insulated electrical apparatus according to claim 14 which is a high voltage cable having a said composition as at least part of the insulation at its termination.
Claim 17
Dependent Claim
18 words
A composition according to claim 1 which contains from 0.25 to 5% by weight of said phosphorus-containing compound.
Claim 18
Dependent Claim
18 words
A composition according to claim 1 which contains from 0.35 to 1.5% by weight of said phosphorus-containing compound.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |