US4766011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Restoring stranded conductor electrical distribution cable
Assignee: Dow Silicones Corp
•
Filing: 1986-12-29
•
Granted: 1988-08-23
•
Expires: 2006-12-29
Abstract
Abstract A method for restoring stranded conductor, polyolefin insulated electrical distribution cable which comprises supplying the interstices of the conductor of said cable with aromatic radical containing silane such as phenyltrimethoxysilane or phenylmethyldimethoxysilane, and mixtures, and partial hydrolyzates thereof.
Inventors
- 👤 Gary A. Vincent
- 👤 Daniel F. Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:02
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; H01B7/00; H01B7/17; H01B7/28; H01B7/2813; Y; Y02; Y02A; Y02A30/00; Y02A30/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
142 words
A method of restoring a polyolefin insulated cable having water-containing tree voids in its insulation, comprising: supplying the interstices of the stranded conductor portion of said cable with an organosilicon fluid which comprises aromatic radical containing silanes or partial hydrolyzates and condensates thereof, of the general formula (RO).sub.x SiR'.sub.y Ar.sub.(4-x-y) where R denotes an alkyl radical with 1 to 6 carbon atoms, R' denotes an alkyl radical with 1 to 6 carbon atoms, Ar denotes an aromatic organic radical chosen from the group consisting of phenyl and benzyl radicals, x is 1, 2 or 3, y is 0, 1 or 2, x+y≦3, where said organosilicon fluid has an initial kinematic viscosity at 25° C. of less than 20 centistokes, whereby said organosilicon fluid is absorbed by said insulation and subsequently polymerizes within said tree voids by reacting with the water contained therein.
Claim 2
Independent Claim
142 words
A method of restoring a polyolefin insulated cable having water-containing tree voids in its insulation, comprising: supplying the interstices of the stranded conductor portion of said cable with an organosilicon fluid which comprises aromatic radical containing silanes or partial hydrolyzates and condensates thereof, of the general formula (RO).sub.x SiR'.sub.y Ar.sub.(4-x-y) where R denotes an alkyl radical with 1 to 6 carbon atoms, R' denotes an alkyl radical with 1 to 6 carbon atoms, Ar denotes an aromatic organic radical chosen from the group consisting of phenyl and benzyl radicals, x is 1, 2 or 3, y is 0, 1 or 2, x+y≦3, where said organosilicon fluid has an initial kinematic viscosity at 25° C. of less than 20 centistokes, whereby said organosilicon fluid is absorbed by said insulation and subsequently polymerizes within said tree voids by reacting with the water contained therein.
Claim 3
Dependent Claim
59 words
The method described in claim 1 wherein said organosilicon fluid further comprises a hydrolysis condensation catalyst in sufficient quantity to increase the kinematic viscosity of said fluid from less than 20 centistokes at 25° C. to more than 100 centistokes at 25° C. in less than 2000 hours at room temperature and pressure in the presence of atmospheric moisture.
Claim 4
Dependent Claim
25 words
The method of claim 1 wherein said organosilicon fluid comprises by weight; (a) 5 to 95 percent phenylmethyldimethoxysilane; and (b) 5 to 95 percent phenyltrimethoxysilane.
Claim 5
Dependent Claim
16 words
The method of claim 1 wherein said organosilicon fluid comprises by weight about 100 percent phenylmethyldimethoxysilane.
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein said organosilicon fluid comprises by weight about 100 percent phenyltrimethoxysilane.
Claim 7
Dependent Claim
25 words
The method of claim 2 wherein said organosilicon fluid comprises by weight; (a) 80 to 95 percent phenylmethyldimethoxysilane; and (b) 5 to 20 percent phenyltrimethoxysilane.
Claim 8
Dependent Claim
30 words
The method of claim 6 wherein said hydrolysis condensation catalyst is chosen from the group consisting of dibutyltindilaurate, dibutyltindiacetate, dibutyltindioctoate, stannous octoate, dimethyltinneodeconoate, di-N-octyltin-S, S-isooctylmercaptoacetate, dibutyltin-S, S-dimethylmercaptoacetate, or diethyltin-S, S-dibutylmercaptoacetate.
Claim 9
Dependent Claim
22 words
The method of claim 7 wherein the hydrolysis condensation catalyst is present between 0.05 and 5 wt percent of the organosilicon fluid.
Claim 10
Dependent Claim
12 words
The method of claim 8 wherein said hydrolysis condensation catalyst is dibutyltindilaurate.
Claim 11
Dependent Claim
27 words
The method of claim 1 which further comprises purging the interstices of the stranded conductor with a dessicant gas prior to supplying said interstices with organosilicon fluid.
References Cited (Backward Citations)
US3252834A
Cited
US3939882A
Cited
US4042776A
Cited
US4206260A
Cited
DE2737430A1
Cited
DE2805875A1
Cited
US4144202A
Cited
US4401491A
Cited
US4372988A
Cited
US4212756A
Cited
US4299713A
Cited
US4400429A
Cited
US4360539A
Cited
US4608306A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |