US3802913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressureless curing system for chemically cross-linking ethylene containing polymers,and product formed thereby
Assignee: Vulkor Inc
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Filing: 1970-10-28
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Granted: 1974-04-09
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Expires: 1990-10-28
Abstract
Abstract A curable composition comprising an ethylene-containing polymer, a curing agent, and a mineral filler treated with an organosilane, is compounded and fabricated to the desired shape, such as an insulation layer over a conductor. The fabricated product is then passed through a non-aqueous heat transfer medium maintained at a temperature sufficient to effect curing in situ of the ethylene-containing polymer. The resulting cured composition is characterized as relatively dense (substantially non-porous), especially suitable for use as insulation for wire and cable.
Inventors
- 👤 Kenzie B Mac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:42
CPC Classifications
B; B29; B29B; B29B15/00; B29B15/08; B29B15/10; B29B15/12; B29B15/122; B29C; B29C48/00; B29C48/022; B29C48/03; B29C48/05; B29C48/06; B29C48/25; B29C48/88; B29C48/91; C; C08; C08F; C08F255/00; C08F255/02; H; H01; H01B; H01B13/00; H01B13/06; H01B13/14; H01B13/145; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; B29K; B29K2101/00; B29K2101/10; B29K2301/00; B29K2301/10; B29L; B29L2031/00; B29L2031/34; B29L2031/3462; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2958; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
12 words
A method according to claim 1 wherein said ethylene-containing polymer is polyethylene.
Claim 2
Dependent Claim
17 words
A method according to claim 1 wherein said ethylene-containing polymer is a copolymer of ethylene and propylene.
Claim 3
Dependent Claim
18 words
A method according to claim 1 wherein said ethylene-containing polymer is a copolymer of ethylene and vinyl acetate.
Claim 4
Dependent Claim
29 words
A method according to claim 1 wherein said mineral filler is selected from the group consisting of aluminum silicate, calcium silicate, magnesium silicate, silica, aluminum oxide, and titanium dioxide.
Claim 5
Dependent Claim
22 words
A method according to claim 1 wherein said filler is treated with about 0.5 to 4 percent by weight of said organo-silane.
Claim 6
Dependent Claim
15 words
A method according to claim 1 wherein said heat transfer medium is a polyalkylene glycol.
Claim 7
Dependent Claim
23 words
A method according to claim 1 wherein said heat transfer medium is a gas substantially inert to the polymer at the curing temperature.
Claim 8
Independent Claim
231 words
A method for making an insulated electrical cable having an insulation about a metallic conductor of a relatively dense, substantially non-porous, mineral filled and cured polymeric composition which is cured at substantially atmospheric pressure, comprising the steps of: treating a mineral filler selected from the group consisting of aluminum silicate, aluminum oxide, calcium silicate, magnesium silicate silica, and titanium dioxide, and mixtures thereof, with an alkyl alkoxy silane wherein said alkyl group has at least two carbon atoms, or a vinyl alkoxy silanes, by admixing said mineral filler with about 0.5 to 3 percent of said organo-silane compound by weight of the filler, and preparing a polymeric composition by admixing ingredients of the composition comprising an ethylene-containing polymer comprising at least about 50 mole percent ethylene, about 25 to 60 percent by weight of the composition of said mineral filler and the treating organo-silane compound, and an orGanic peroxide curing agent; forming an insulation layer of said polymer composition around a metallic conductor; and thereafter heating and curing said polymeric composition insulation at about atmospheric pressure by passing the resulting insulated cable through a non-aqueous heat transfer medium which is substantially inert to the polymeric composition and at a temperature and for a dwell time sufficient to effect an in situ cross-linking cure of the ethylene-containing polymer composition to a relatively dense and substantially non-porous insulation of cured filled polymer composition.
Claim 9
Dependent Claim
166 words
An insulated electrical cable comprising a metallic conductor and a relatively dense and substantially non-porous layer of insulation of cured filled polymeric composition, said insulation comprising the heat cured product of: a) an ethylene containing polymer comprising at least 50 mole percent ethylene, b) an organic peroxide curing agent, and c) a mineral filler in an amount of about 25 to 60 percent by weight of the composition which has been treated with an alkyl alkoxy silane wherein said alkyl group has at least two carbon atoms, or a vinyl alkoxy silanes, in an amount of about 0.15 to 4 percent by weight of the filler, and which has been heat cured at substantially atmospheric pressure by passing the metallic conductor with a curable polymeric composition comprising said ingredients through a non-aqueous heat transfer medium which is substantially inert to the polymeric composition, maintained at a temperature and for a dwell time sufficient to effect an in situ cross-linking cure of the ethylene containing polymer composition.
Claim 10
Dependent Claim
11 words
The cable of claim 10 wherein said ethylene-containing polymer is polyethylene.
Claim 11
Dependent Claim
16 words
The cable of claim 10 wherein said ethylene-containing polymer is a copolymer of ethylene and propylene.
Claim 12
Dependent Claim
17 words
The cable of claim 10 wherein said ethylene-containing polymer is a copolymer of ethylene and vinyl acetate.
Claim 13
Dependent Claim
28 words
The cable of claim 10 wherein said mineral filler is selected from the group consisting of aluminum silicate, calcium silicate, magnesium silicate, silica, aluminum oxide, and titanium dioxide.
Claim 14
Dependent Claim
14 words
The cable of claim 10 wherein said heat transfer medium is a polyalkylene glycol.
Claim 15
Dependent Claim
187 words
An insulated electrical cable comprising a metallic conductor and a relatively dense and substantially non-porous layer of insulation of cured filled polymeric composition, said insulation comprising the heat cured product of: a) an ethylene containing polymer comprising at least 50 mole percent ethylene, b) an organic peroxide curing agent, and c) a mineral filler selected from the group consisting of aluminum silicate, aluminum oxide, calcium silicate, magnesium silicate, silica, and titanium dioxide, and mixtures thereof, in an amount of about 25 to 60 percent by weight of the composition which has been treated with an alkyl alkoxy silane wherein said alkyl group has at least two carbon atoms, or a vinyl alkoxy silanes, in an amount of about 0.5 to 3 percent by weight of the filler, and which has been heat cured at substantially atmospheric pressure by passing the metallic conductor with a curable polymeric composition comprising said ingredients through a non-aqueous heat transfer medium which is substantially inert to the polymer composition, maintained at a temperature and for a dwell time sufficient to effect an in situ cross-linking cure of the ethylene containing polymeric composition.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |