US4120838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyphosphazene wire coverings
Assignee: Bridgestone Firestone Inc
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Filing: 1977-08-01
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Granted: 1978-10-17
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Expires: 1997-08-01
Abstract
Abstract Wire covering compositions are described with excellent electrical properties and an outstanding combination of physical properties. The compositions comprise polyphosphazenes to which fillers, particularly Mg(OH) 2 and Al 2 O 3 .3H 2 O have been added and which include as a processing aid alkylarylsiloxanes.
Inventors
- 👤 John Charles Vicic
- 👤 Kennard Anthony Reynard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:02
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/29; H01B7/295; C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08L; C08L83/00; C08L83/04; C08L85/00; C08L85/02; H01B3/00; H01B3/18; H01B3/30; H01B3/307
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
100 words
A composition suitable as a fire resistant low smoking, electrically insulating covering for electrically conducting metal wires comprising for each 100 parts by weight of polyaryloxyphosphazene polymer: (1) between 50 and 125 parts by weight of a hydrated filler selected from the group consisting of Mg(OH) 2 , Al 2 O 3 .3H 2 O and mixtures thereof; (2) an effective amount of a curing agent; (3) between 3 and 11 parts by weight of a polysiloxane as a processing agent; and a compound of lead in an amount which is effective to improve the moisture resistance of the composition.
Claim 2
Dependent Claim
100 words
A composition suitable as a fire resistant low smoking, electrically insulating covering for electrically conducting metal wires comprising for each 100 parts by weight of polyaryloxyphosphazene polymer: (1) between 50 and 125 parts by weight of a hydrated filler selected from the group consisting of Mg(OH) 2 , Al 2 O 3 .3H 2 O and mixtures thereof; (2) an effective amount of a curing agent; (3) between 3 and 11 parts by weight of a polysiloxane as a processing agent; and a compound of lead in an amount which is effective to improve the moisture resistance of the composition.
Claim 3
Dependent Claim
19 words
The composition of claim 1 wherein the amount of filler is about equal to the weight of the polymer.
Claim 4
Dependent Claim
12 words
The composition of claim 1 wherein the curing agent is a peroxide.
Claim 5
Dependent Claim
18 words
The composition of claim 1 wherein the processing aid is a polydimethylsiloxane containing both phenyl and vinyl groups.
Claim 6
Dependent Claim
14 words
The composition of claim 1 including in addition an effective amount of an antioxidant.
Claim 7
Dependent Claim
15 words
The composition of claim 5 wherein the antioxidant is a high molecular weight phenolic compound.
Claim 8
Dependent Claim
23 words
The composition of claim 1 including in addition between about 0.05% and 5.0% by weight of a stabilizer consisting of a metal 8-hydroxyquinolate.
Claim 9
Dependent Claim
20 words
The composition of claim 1 including in addition between 1 and 5 parts by weight of an aryl silicone oil.
Claim 10
Dependent Claim
10 words
A metal wire covered with the composition of claim 1.
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) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |