Patent US3128333A successfully refreshed from Google Patents.
US3742084A
Expired / Lapsed
US
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Corona-resistant electrically insulating organic polymeric compositions
Assignee: 3M Co
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Filing: 1971-03-04
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Granted: 1973-06-26
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Expires: 1991-03-04
Abstract
Abstract Organic, polymeric, electrically insulating compositions having high corona resistance comprising a base organic electrically insulating material and, in an amount equaling 1-10 percent of the weight of the base material, a silicone resin. A typical silicone resin is a hydrolyzate type of branched silicone resin prepared by condensation of mixed methyl and phenyl chlorosilanes.
Inventors
- 👤 M Olyphant
- 👤 A Bridenbecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:04
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/46; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08K3/06; C08K3/18; C08K3/20; C08K3/22; C08K3/34; C08K3/346; C08K5/00; C08K5/04; C08K5/14; C08L; C08L23/00; C08L23/02; C08L23/16; H01B3/44; H01B3/441; C08L2312/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
24 words
A composition of claim 1 in which the monovalent hydrocarbon radical of the silicone resin is selected from methyl ethyl, vinyl, and phenyl groups.
Claim 2
Dependent Claim
26 words
A composition of claim 1 in which the silicone resin has on the average at least 0.2 branch for each silicon atom in the resin molecule.
Claim 3
Dependent Claim
23 words
A composition of claim 1 that includes said silicone resin in an amount equal to at least 3 weight-percent of the base polymer.
Claim 4
Dependent Claim
12 words
A composition of claim 1 that further includes a particulate inorganic filler.
Claim 5
Dependent Claim
23 words
A composition of claim 1 in which the silicone resin has on the average at least 10 silicon atoms in each resin molecule.
Claim 6
Independent Claim
179 words
A method for increasing the corona resistance of a composition of matter that (1) is used to provide electrical insulation on conductors where the insulation is subject to conditions leading to corona attack and (2) is based on an organic electrically insulating material that incluDes a polyolefin, the method comprising mixing into a continuous phase of the base organic electrically insulating material of the composition in an amount equaling about 1-10 percent of the weight of the base organic electrically insulating material, a silicone resin that (a) is substantially compatible with the base material, (b) is substantially not reactive with the base material under processing conditions used for the composition, (c) has on the average at least 5 silicon atoms in each resin molecule, (d) has on the average at least 0.1 branch for each silicon atom in the resin molecule, and (e) has the formula Rn SiXm O4-n-m/2, where R is a monovalent hydrocarbon radical, X is a hydroxyl or alkoxy radical, the sum of n and m is less than 3, and m is less than 1.
Claim 7
Dependent Claim
151 words
An insulated electrical article comprising an electric conductor and electrical insulation around the conductor comprising (1) a continuous phase of a base organic insulating material that includes a polyolefin, and (2) mixed into the base organic insulating material in an amount equaling about 1-10 percent of the weight of the base organic insulating material, a silicone resin that (a) is substantially compatible with the base material, (b) is substantially not reactive with the base material under processing conditions used for the composition, (c) has on the average at least 5 silicon atoms in each resin molecule, (d) has on the average at least 0.1 branch for each silicon atom in the resin molecule, and (e) has the formula Rn SiXm O4-n-m/2, where R is a monovalent hydrocarbon radical, X is a hydroxyl or alkoxy radical, the sum of n and m is less than 3, and m is less than 1.
Claim 8
Dependent Claim
150 words
An electrical cable comprising an elongated conductor and electrical insulation around the conductor comprising (1) a continuous phase of a base organic insulating material that includes a polyolefin, and (2) mixed into the base organic insulating material in an amount equaling about 1-10 percent of the weight of the base organic insulating material, a silicone resin that (a) is substantially compatible with the base material, (b) is substantially not reactive with the base material under processing conditions used for the composition, (c) has on the average at least 5 silicon atoms in each resin molecule, (d) has on the average at least 0.1 branch for each silicon atom in the resin molecule, and (e) has the formula Rn SiXm O4-n-m/2, where R is a monovalent hydrocarbon radical, X is a hydroxyl or alkoxy radical, the sum of n and m is less than 3, and m is less than 1.
References Cited (Backward Citations)
US3170890A
Cited
US3575916A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |