Cable sealing apparatus comprising heat resistant gel compositions
First Claim
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1. A cable sealing apparatus, comprising:
- a first end seal, the first end seal comprising a layer of gel which comprises;
(1) about 2 to about 30 parts by weight of a poly(styrene-ethylene-butylene-styrene) triblock copolymer having a styrene to ethylene butylene block ratio of about 27 to 35 styrene blocks to about 65 to 73 ethylene butylene blocks, and having a molecular weight of at least 100,000; and
(2) about 70 to about 98 parts by weight of a plasticizer;
wherein the triblock copolymer and the plasticizer have been(a) melt-blended and(b) have been treated(i) at sufficiently high temperature or(ii) under sufficiently high shear to cause the composition to have a cone penetration of at least about 50 (10-1 mm), an ultimate elongation of at least about 200% and a viscosity at 200°
C. of at least 10 poise;
the layer of gel including(A) means formed therein for passage of the cable to be sealed therethrough between inner and outer opposite faces of the gel, the cable to be sealed being held in contact with the gel formed means;
(B) a convoluted member forming an outer circumferential surface of the gel, the convoluted member having a series of ridges and valleys extending circumferentially therearound;
(C) a first member disposed adjacent to and in contact with an outer face of the gel and having means formed therein to facilitate passage of the cable to be sealed therethrough;
(D) a second member disposed adjacent to and in contact with an inner face of the gel and having means formed therein to facilitate passage of the cable to be sealed therethrough; and
(E) gel formed means comprising a plurality of longitudinal slits extending through the gel, a width of at least one of the slits being greater than a diameter of the cable to be sealed.
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Abstract
This invention provides cable sealing apparatus comprising styrene-ethylene-butylene-styrene triblock copolymer-oil compositions which are temperature resistant and nonmeltable. They have a viscosity at 200° C. of at least 200 poise. The compositions can be molded under pressure at elevated temperatures.
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Citations
33 Claims
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1. A cable sealing apparatus, comprising:
- a first end seal, the first end seal comprising a layer of gel which comprises;
(1) about 2 to about 30 parts by weight of a poly(styrene-ethylene-butylene-styrene) triblock copolymer having a styrene to ethylene butylene block ratio of about 27 to 35 styrene blocks to about 65 to 73 ethylene butylene blocks, and having a molecular weight of at least 100,000; and (2) about 70 to about 98 parts by weight of a plasticizer;
wherein the triblock copolymer and the plasticizer have been(a) melt-blended and (b) have been treated (i) at sufficiently high temperature or (ii) under sufficiently high shear to cause the composition to have a cone penetration of at least about 50 (10-1 mm), an ultimate elongation of at least about 200% and a viscosity at 200°
C. of at least 10 poise;the layer of gel including (A) means formed therein for passage of the cable to be sealed therethrough between inner and outer opposite faces of the gel, the cable to be sealed being held in contact with the gel formed means; (B) a convoluted member forming an outer circumferential surface of the gel, the convoluted member having a series of ridges and valleys extending circumferentially therearound; (C) a first member disposed adjacent to and in contact with an outer face of the gel and having means formed therein to facilitate passage of the cable to be sealed therethrough; (D) a second member disposed adjacent to and in contact with an inner face of the gel and having means formed therein to facilitate passage of the cable to be sealed therethrough; and (E) gel formed means comprising a plurality of longitudinal slits extending through the gel, a width of at least one of the slits being greater than a diameter of the cable to be sealed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- a first end seal, the first end seal comprising a layer of gel which comprises;
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15. A splice cable closure, comprising:
- first and second ends seals, each of which seals comprises a convoluted disc
(A) having convolutions on an outer cylindrical surface thereof and (B) having a layer of gel on an inside surface thereof shaped so as to form an axial bore therethrough, said layer of gel comprising; (1) about 2 to about 30 parts by weight of a poly(styrene-ethylene-butylene-styrene) triblock copolymer having a styrene to ethylene butylene block ratio of about 27 to 35 styrene blocks to about 65 to 73 ethylene butylene blocks, and having a molecular weight of at least 100,000; and (2) about 70 to about 98 parts by weight of a plasticizer; wherein the triblock copolymer and the plasticizer (a) have been melt blended and (b) have been treated at sufficiently high temperature or under sufficiently high shear to cause the composition to have a cone penetration of at least about 50 (10-1 mm), an ultimate elongation of at least about 200% and a viscosity of 200°
C. of at least 10 poise; anda bridging member having a continuous convoluted inner surface at opposite ends thereof adapted for engagement with an outer surface of the first and second end seals, the end seals being adapted to be disposed on a cable opposite a cable splice, the bridging member being adapted to be disposed around the splice. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
- first and second ends seals, each of which seals comprises a convoluted disc
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24. A kit of parts capable of being assembled into a splice enclosure comprising:
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a convoluted disc (A) having convolutions on an outer cylindrical surface thereof and (B) having a layer of gel on an inside surface thereof shaped so as to form an axial bore therethrough, said layer of gel comprising; (1) about 2 to about 30 parts by weight of a poly(styrene-ethylene-butylene-styrene) triblock copolymer having a styrene to ethylene butylene block ratio of about 27 to 35 styrene blocks to about 65 to 73 ethylene butylene blocks, and having a molecular weight of at least 100,000; and (2) about 70 to about 98 parts by weight of a plasticizer; wherein the triblock copolymer and the plasticizer (a) have been melt blended and (b) have been treated at sufficiently high temperature or under sufficiently high shear to cause the composition to have a cone penetration of at least about 50 (10-1 mm), an ultimate elongation of at least about 200% and a viscosity at 200°
C. of at least 10 poise; anda bridging member having a continuous convoluted inner surface at opposite ends thereof adapted for engagement with an outer surface of the first and second end seals, the end seals being adapted to be disposed on a cable opposite a cable splice, the bridging member being adapted to be disposed around the splice. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification