US3859247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressureless cure system for chemically cross-linking ethylene containing polymers
Assignee: Vulkor Inc
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Filing: 1972-11-10
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Granted: 1975-01-07
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Expires: 1992-11-10
Abstract
Abstract A curable composition comprising an ethylene-containing polymer, a curing agent, and a mineral filler treated with tetramethyltetravinylcyclotetrasiloxane, is compounded and fabricated to the desired shape, such as an insulation layer over a conductor. The fabricated product is then passed through a nonaqueous heat transfer medium maintained at about atmospheric pressure and 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
- 👤 Jr Burton Thornley Mackenzie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:29
CPC Classifications
B; B29; B29C; B29C35/00; B29C35/02; B29C35/04; B29C35/06; B29C35/065; B29C48/00; B29C48/022; B29C48/03; B29C48/06; B29C48/25; B29C48/88; B29C48/91; C; C08; C08F; C08F255/00; C08F255/02; B29C48/05; B29K; B29K2101/00; B29K2101/10; B29K2301/00; B29K2301/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
114 words
A METHOD OF CURING A COMPOSITION COMPRISING AN ETHYLENE CONTAINING POLYMER AND MINERAL FILLER TREATED WITH ABOUT 0.15 TO 4.0 PERCENT OF TETRAMETHYLETRAVINYLCYCLOTETRASIOLXANE BY WEIGHT OF THE FILLER AT SUBSTANTIALLY ATMOSPHERIC PRESSURE TO A RELATIVELY DENSE AND SUBSTANTIALLY NON-POROUS CURED POLYMERIC COMPOSITION, COMPRISING THE STEPS OF PREPARING THE COMPOSITION BY ADMIXING THE INGREDIENTS COMPRISING AN ETHYLENE CONTAINING POLYMER, MINERAL FILLER, TREATING TETRAMETHYLTETRAVINYCYCLOTETRASILOXANE, AND CURING AGENT; AND THEREAFTER HEATING THE SAID ADMIZED COMPOSITION AT ABOUT ATMOSPHERIC PRESSURE IN AN NON-AQUEOUS HEAT TRANSFER MEDIUM TO A TEMATURE AND FOR A DWELL TIME SUFFICIENT TO EFFECT AN IN SITU CROSSLINKING CURE OF THE ETHYLENE CONTAINING POLYMER TO A RELATIVELY DENSE AND SUBSTANTIALLY NON-POROUS CURED FILLED POLYMER COMPOSITION.
Claim 2
Independent Claim
114 words
A METHOD OF CURING A COMPOSITION COMPRISING AN ETHYLENE CONTAINING POLYMER AND MINERAL FILLER TREATED WITH ABOUT 0.15 TO 4.0 PERCENT OF TETRAMETHYLETRAVINYLCYCLOTETRASIOLXANE BY WEIGHT OF THE FILLER AT SUBSTANTIALLY ATMOSPHERIC PRESSURE TO A RELATIVELY DENSE AND SUBSTANTIALLY NON-POROUS CURED POLYMERIC COMPOSITION, COMPRISING THE STEPS OF PREPARING THE COMPOSITION BY ADMIXING THE INGREDIENTS COMPRISING AN ETHYLENE CONTAINING POLYMER, MINERAL FILLER, TREATING TETRAMETHYLTETRAVINYCYCLOTETRASILOXANE, AND CURING AGENT; AND THEREAFTER HEATING THE SAID ADMIZED COMPOSITION AT ABOUT ATMOSPHERIC PRESSURE IN AN NON-AQUEOUS HEAT TRANSFER MEDIUM TO A TEMATURE AND FOR A DWELL TIME SUFFICIENT TO EFFECT AN IN SITU CROSSLINKING CURE OF THE ETHYLENE CONTAINING POLYMER TO A RELATIVELY DENSE AND SUBSTANTIALLY NON-POROUS CURED FILLED POLYMER COMPOSITION.
Claim 3
Dependent Claim
37 words
The method of curing of claim 1, wherein the mineral filler is pretreated with the tetramethyltetravinylcyclotetrasiloxane by intimately admixing the tetramethyltetravinylcyclotetrasiloxane with the filler and then admixing the pretreated filler with the other ingredients of the composition.
Claim 4
Dependent Claim
30 words
The method of curing of claim 1, wherein the mineral filler is treated with the tetramethyltetravinylcyclotetrasiloxane by intimately admixing the mineral filler and tetramethyltetravinylcyclotetrasiloxane together with the ethylene containing polymer.
Claim 5
Dependent Claim
35 words
The method of curing of claim 1, wherein the ethylene containing polymer is selected from the group consisting of polyethylene, copolymers of ethylene and propylene, and copolymers of ethylene and vinyl acetate, and mixtures thereof.
Claim 6
Dependent Claim
28 words
The method of curing of claim 1, wherein the mineral filler content of the ethylene containing polymer is about 25 to 60 percent by weight of the composition.
Claim 7
Dependent Claim
33 words
The method of curing of claim 5, wherein the mineral filler is selected from the group consisting of aluminum silicate, aluminum oxide, calcium silicate, silica, magnesium silicate, and titanium dioxide, and mixtures thereof.
Claim 8
Dependent Claim
28 words
The method of curing of claim 6, wherein the mineral filler content of the ethylene containing polymer is about 30 to 50 percent by weight of the composition.
Claim 9
Dependent Claim
23 words
The method of curing of claim 7, wherein the mineral filler is treated with about 0.5 to 3 percent by weight of tetramethyltetravinylcyclotetrasiloxane.
Claim 10
Dependent Claim
33 words
The method of curing of claim 6, wherein the curing agent is a tertiary organic peroxide in amount of about 0.5 to 10 parts by weight per hundred parts by weight of polymer.
Claim 11
Independent Claim
211 words
A method of curing a composition comprising an ethylene containing polymer with mineral filler at substantially atmospheric pressure to a relatively dense and substantially non-porous cured polymer composition, comprising the steps of: treating a mineral filler selected from the group consisting of aluminum silicate, calcium silicate, magnesium silicate, silica, aluminum oxide, and titanium dioxide, and mixtures thereof, with tetramethyltetravinylcyclotetrasiloxane by admixing said mineral filler with about 0.15 to 4.0 percent of tetramethyltetravinylcyclotetrasiloxane by weight of the filler, and admixing the composition ingredients comprising an ethylene containing polymer with at least about 50 mole percent ethylene selected from the group consisting of polyethylene, copolymers of ethylene and propylene, and copolymers of ethylene and vinyl acetate, and mixtures thereof, with about 25 to 60 percent by weight of the composition of said mineral filler and treating tetramethyltetravinylcyclotetrasiloxane, and about 0.5 to 10 parts by weight of organic peroxide curing agent per 100 parts by weight of ethylene containing polymer; and thereafter heating the said admixed composition at about atmospheric pressure in a non-aqueous heat transfer medium to a temperature and for a dwell time sufficient to effect an in situ cross-linking cure of the filled, ethylene containing polymer and peroxide curing agent to a relatively dense and substantially non-porous cured filled polymer composition.
Claim 12
Independent Claim
211 words
A method of curing a composition comprising an ethylene containing polymer with mineral filler at substantially atmospheric pressure to a relatively dense and substantially non-porous cured polymer composition, comprising the steps of: treating a mineral filler selected from the group consisting of aluminum silicate, calcium silicate, magnesium silicate, silica, aluminum oxide, and titanium dioxide, and mixtures thereof, with tetramethyltetravinylcyclotetrasiloxane by admixing said mineral filler with about 0.15 to 4.0 percent of tetramethyltetravinylcyclotetrasiloxane by weight of the filler, and admixing the composition ingredients comprising an ethylene containing polymer with at least about 50 mole percent ethylene selected from the group consisting of polyethylene, copolymers of ethylene and propylene, and copolymers of ethylene and vinyl acetate, and mixtures thereof, with about 25 to 60 percent by weight of the composition of said mineral filler and treating tetramethyltetravinylcyclotetrasiloxane, and about 0.5 to 10 parts by weight of organic peroxide curing agent per 100 parts by weight of ethylene containing polymer; and thereafter heating the said admixed composition at about atmospheric pressure in a non-aqueous heat transfer medium to a temperature and for a dwell time sufficient to effect an in situ cross-linking cure of the filled, ethylene containing polymer and peroxide curing agent to a relatively dense and substantially non-porous cured filled polymer composition.
Claim 13
Dependent Claim
14 words
The method of claim 10, wherein the organic peroxide is a tertiary organic peroxide.
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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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |