Patent EP0067009A1 successfully refreshed from Google Patents.
EP0067009A1
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Water-excluding filling composition
Assignee: Raychem Corp
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Filing: 1982-05-25
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Granted: —
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Expires: 2002-05-25
Abstract
Abstract Hydrophobic filling compositions (3) comprise a mineral oil and a hydrophobic fumed silica, and optionally other additives such as a depolymerized butyl rubber, a microcrystalline wax or hydrophobic glass microspheres. The compositions have a very low water content, a good thermal stability to phase separation of oil and an unexpectedly improved water-excluding capability. These hydrophobic filling compositions have excellent electrical properties and are particularly useful as water-excluding filling compounds for splice cases, sealing connections between telecommunication cables.
Inventors
- 👤 Christian Arthur Marie L. Debbaut
- 👤 Paul Sung Chan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 18:42
CPC Classifications
C; C10; C10M; C10M169/00; C10M101/00; G; G02; G02B; G02B6/00; G02B6/02; G02B6/02395; G02B6/44; G02B6/4401; G02B6/4429; G02B6/44384; H; H01; H01B; H01B7/00; H01B7/17; H01B7/28; H01B7/282; H01B7/285; H02; H02G; H02G15/00; H02G15/003; C10M2201/00; C10M2201/02; C10M2201/10; C10M2201/105; C10M2201/12; C10M2203/00; C10M2203/10; C10M2205/00; C10M2205/06; C10M2205/14; C10M2205/16; C10M2205/17; C10M2227/00; C10M2227/04; C10N; C10N2040/00; C10N2040/14; C10N2040/16; C10N2040/17
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
34 words
A hydrophobic filling composition, comprising: (a) a mineral oil; and (b) about 6 to about 30% by weight of a hydrophobic fumed silica having a primary particle size of less than about 0.05 micron.
Claim 2
Dependent Claim
34 words
A hydrophobic filling composition, comprising: (a) a mineral oil; and (b) about 6 to about 30% by weight of a hydrophobic fumed silica having a primary particle size of less than about 0.05 micron.
Claim 3
Dependent Claim
19 words
A composition according to Claim 1, which comprises from about 12 to about 24% by weight of the silica.
Claim 4
Dependent Claim
22 words
A composition according to Claim 1 or 2, in which the mineral oil consists essentially of saturated hydrocarbon and is substantially aromatic-free.
Claim 5
Dependent Claim
24 words
A composition according to Claim 1, 2 or 3, which further comprises from about 0.01 to about 10% by weight of a microcrystalline wax.
Claim 6
Dependent Claim
22 words
A composition according to any preceding Claim, which further comprises from about 0.01 to about 20% by weight of hydrophobic glass microspheres.
Claim 7
Dependent Claim
20 words
A composition according to any preceding Claim, which additionally comprises a polymeric thickener substantially entirely dissolved in the mineral oil.
Claim 8
Dependent Claim
15 words
A composition according to Claim 6, in which the polymeric thickener comprises a depolymerized rubber.
Claim 9
Dependent Claim
16 words
A composition according to Claim 7, in which the polymeric thickener comprises a depolymerized butyl rubber.
Claim 10
Dependent Claim
37 words
A composition according to Claim 8, in which the polymeric thickener is a copolymer which comprises from about 80 to about 98% by weight of isobutylene and from about 2 to about 20% by weight of isoprene.
Claim 11
Dependent Claim
20 words
A composition according to Claim 6, which is comprised of at least about 5% by weight of the polymeric thickener.
Claim 12
Dependent Claim
22 words
A composition according to Claim 10, which is comprised of from about 10 to about 30% by weight of the polymeric thickener.
Claim 13
Dependent Claim
17 words
A composition according to any preceding Claim, in which the drip point is about 80°C or greater.
Claim 14
Dependent Claim
22 words
A composition according to any preceding Claim, having a viscosity of about 30,000 poise or less at 1 Hertz and at -10°C.
Claim 15
Dependent Claim
18 words
A composition according to any preceding Claim, having a water content of about 0.1% by weight or less.
Claim 16
Dependent Claim
12 words
A composition according to any preceding Claim, which additionally comprises an antioxidant.
Claim 17
Dependent Claim
63 words
A hydrophobic filling composition, comprising: (a) as a lattice a hydrophobic fumed silica; and (b) dispersed throughout and supported by said lattice, a solution of a polymeric thickener in a mineral oil, the mineral oil having a pour point of about -10°C or less and a viscosity of at least about 300 SUS at 40°C; said filling composition being a hydrophobic thixotropic grease.
Claim 18
Dependent Claim
63 words
A hydrophobic filling composition, comprising: (a) as a lattice a hydrophobic fumed silica; and (b) dispersed throughout and supported by said lattice, a solution of a polymeric thickener in a mineral oil, the mineral oil having a pour point of about -10°C or less and a viscosity of at least about 300 SUS at 40°C; said filling composition being a hydrophobic thixotropic grease.
Claim 19
Dependent Claim
14 words
A composition according to Claim 16, which comprises 12-24% by weight of said silica.
Claim 20
Dependent Claim
23 words
A composition according to Claim 16 or 17, in which said silica has a primary particle size of less than about 0.05 micron.
Claim 21
Dependent Claim
30 words
A composition according to Claim 16, 17 or 18, in which said mineral oil is a heavy mineral oil having an average molecular weight of about 400 to about 450.
Claim 22
Dependent Claim
24 words
A composition according to any of Claims 16-19, in which said polymeric thickener has an average molecular weight of from about 40000to 45000. .
Claim 23
Dependent Claim
17 words
A composition according to any of Claims 16-20, in which said polymeric thickener comprises a degraded rubber.
Claim 24
Dependent Claim
16 words
A composition according to Claim 21, in which said polymeric thickener is a degraded butyl rubber.
Claim 25
Dependent Claim
22 words
A composition according to any of Claims 16-22, in which said polymeric thickener has a Brookfield viscosity at 66°C of about 1,300,000.
Claim 26
Dependent Claim
23 words
A composition according to any of Claims 16-23, which is comprised of from at least about 5% by weight of said polymeric thickener.
Claim 27
Dependent Claim
22 words
A composition according to Claim 24, which is comprised of from about 10 to about 30% by weight of the polymeric thickener.
Claim 28
Dependent Claim
16 words
A composition according to any of Claims 1-15, in the form of a hydrophobic thixotropic grease.
Claim 29
Dependent Claim
13 words
A composition according to any of Claims 16-26, which additionally comprises an antioxidant.
Claim 30
Dependent Claim
79 words
A spliced cable comprising: (a) a spliced core; (b) an outer sheath surrounding the core and which has been partially removed to allow for splicing, thereby defining a splice zone; (c) a splice case externally surrounding the splice zone and extending transversely for a distance on either side thereof so that the splice case overlaps the outer sheath; and (d) a hydrophobic filling composition according to any of Claims 1-28, within the splice case and substantially sealing the cores.
Claim 31
Dependent Claim
17 words
A spliced cable according to Claim 28, in which the core is at least one optical fiber.
Claim 32
Dependent Claim
14 words
A spliced cable according to Claim 28, in which the core is electrically conductive.
Claim 33
Dependent Claim
17 words
A spliced cable according to Claim 30, in which the core comprises a plurality of electrical conductors.
Claim 34
Dependent Claim
20 words
A spliced cable according to Claim 28, 29 or 30, in which the splice case is a recovered polymeric sleeve.
Claim 35
Dependent Claim
31 words
A filled cable which comprises: (a) a core; (b) a sheath surrounding the core; (c) a filling composition according to any of Claims 1-28, surrounding the core and within the sheath.
Claim 36
Dependent Claim
25 words
A filled cable according to Claim 33, in which the filling composition is localized along the length of the cable to provide a cable block.
Claim 37
Dependent Claim
64 words
An assembly for environmentally sealing a substrate, which comprises: (a) a hollow recoverable article which can surround the substrate and which can be recovered substantially to enclose the substrate; and (b) a filling composition according to any of Claims 1-28, which can surround the substrate within the recoverable article to provide a seal between the substrate and the article when in its recovered form.
Claim 38
Dependent Claim
14 words
An assembly according to Claim 35, in which the recoverable article is a sleeve.
Claim 39
Dependent Claim
13 words
An assembly according to Claim 41, in which the recoverable article is heat-recoverable.
Claim 40
Independent Claim
81 words
A method of producing a hydrophobic thixotropic grease which comprises: (a) producing a solution by dissolving a polymeric thickener in a mineral oil having a viscosity of at least about 300 SUS at 40°C and a pour point of about -10°C or less; (b) adding to the solution a hydrophobic fumed silica; and (c) mixing with shearing the solution and silica to cause the silica to form a lattice throughout which the solution is dispersed, and by which it is supported.
Claim 41
Independent Claim
81 words
A method of producing a hydrophobic thixotropic grease which comprises: (a) producing a solution by dissolving a polymeric thickener in a mineral oil having a viscosity of at least about 300 SUS at 40°C and a pour point of about -10°C or less; (b) adding to the solution a hydrophobic fumed silica; and (c) mixing with shearing the solution and silica to cause the silica to form a lattice throughout which the solution is dispersed, and by which it is supported.
Claim 42
Dependent Claim
16 words
A method according to Claim 38, in which the polymeric thickener is a depolymerized butyl rubber.
Claim 43
Dependent Claim
21 words
A method according to Claim 39, in which the mixing with shearing is carried out at a temperature above about 80°C.
Claim 44
Dependent Claim
54 words
A method according to Claim 40, in which step (a) is carried out by mixing the oil and the polymeric thickener at a first temperature to produce a soft gel, said soft gel is heated to a second temperature to produce a liquid solution, and step (b) is carried out at the second temperature.
References Cited (Backward Citations)
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FR2472820A1
Cited
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