Patent EP0058022A1 successfully refreshed from Google Patents.
EP0058022A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Electric cables and compositions for use in them
Assignee: Balfour Beatty PLC
•
Filing: 1982-01-28
•
Granted: —
•
Expires: 2002-01-28
Abstract
Abstract A low-tack, non-cell filling filling medium for telecommunication cables comprises in parts (by weight):- (a) 70 - 98% of a hydrocarbon base; (b) 1 - 15% of a block copolymer which comprises at least one block tending to confer solubility in the base and at least one block tending to inhibit such solubility, the proportions of the blocks being such that the polymer shows a strong tendency to form a gel with the base; and (c) 1 - 15% of a hydrocarbon material that is miscible with the medium at high temperatures but forms solid dispersed particles on cooling at a temperature not lower than 65°C: the base (a) comprising: (i) 0 - 95% of a mineral oil with or without wax, for example in the form of petroleum jelly; and (ii) 5 - 100% of a hydrocarbon or hydrocarbon mixture whose molecules are substantially incapable of diffusing into polyethylene, polypropylene or other cellular insulating material at temperatures of up to 80°C and, when mineral oil is present being soluble in it and having a low enough (number average) molecular weight to reduce significantly the osmotic pressure of the medium.
Inventors
- 👤 John Michael Richards Hagger
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 18:53
CPC Classifications
C; C08; C08L; C08L23/00; H; H01; H01B; H01B3/00; H01B3/18; H01B3/20; H01B3/22; H01B7/00; H01B7/17; H01B7/28; H01B7/282; H01B7/285; C10; C10M; C10M2205/00; C10M2205/02; C10M2205/022; C10M2205/026; C10M2205/04; C10M2205/14; C10N; C10N2040/00; C10N2040/14; C10N2040/16; C10N2040/17
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
186 words
A filling medium for fully-filled telecommunication cables comprising (by weight):- (a) 70 - 98% of a hydrocarbon base; (b) 1 - 15% of a block copolymer which comprises at least one block tending to confer solubility in the base and at least one block tending to inhibit such solubility, the proportions of the blocks being such that the polymer shows a strong tendency to form a gel with the base; and (c) 1 - 15% of a hydrocarbon material that is miscible with the medium at high temperatures but forms solid dispersed particles on cooling at a temperature not lower than 65°C: the base (a) comprising: (i) 0 - 95% of a mineral oil with or without wax, for example in the form of petroleum jelly; and (ii) 5 - 100% of a hydrocarbon or hydrocarbon mixture whose molecules are substantially incapable of diffusing into polyethylene, polypropylene or other cellular insulating material at temperatures of up to 80°C and, when mineral oil is present being soluble in it and having a low enough (number average) molecular weight to reduce significantly the osmotic pressure of the medium.
Claim 2
Dependent Claim
186 words
A filling medium for fully-filled telecommunication cables comprising (by weight):- (a) 70 - 98% of a hydrocarbon base; (b) 1 - 15% of a block copolymer which comprises at least one block tending to confer solubility in the base and at least one block tending to inhibit such solubility, the proportions of the blocks being such that the polymer shows a strong tendency to form a gel with the base; and (c) 1 - 15% of a hydrocarbon material that is miscible with the medium at high temperatures but forms solid dispersed particles on cooling at a temperature not lower than 65°C: the base (a) comprising: (i) 0 - 95% of a mineral oil with or without wax, for example in the form of petroleum jelly; and (ii) 5 - 100% of a hydrocarbon or hydrocarbon mixture whose molecules are substantially incapable of diffusing into polyethylene, polypropylene or other cellular insulating material at temperatures of up to 80°C and, when mineral oil is present being soluble in it and having a low enough (number average) molecular weight to reduce significantly the osmotic pressure of the medium.
Claim 3
Dependent Claim
29 words
A medium as claimed in Claim 1 in which the ingredient (ii) of the base comprises a liquid polybutene with a number average molecular weight between 200 and 4000.
Claim 4
Independent Claim
18 words
A medium as claimed in Claim loin which the ingredient (ii) comprises a low molecular weight hydrocarbon resin.
Claim 5
Dependent Claim
24 words
4 . A medium as claimed in any one of the preceding claims in which the oil has an aromatic content less than 15%.
Claim 6
Independent Claim
53 words
A medium as claimed in any one of the preceding claims in which ingredient (b) is a block copolymer of the A BA type in which the centre block (B) is a random copolymer of ethylene and butylene with end blocks (A) formed by graft polymerisation of styrene on to the centre block.
Claim 7
Independent Claim
21 words
A medium as claimed in any one of the preceding claims in which there is 1.5 to 5% of ingredient (c).
Claim 8
Dependent Claim
188 words
A fully-filled telecommunication cable distinguished by a filling medium comprising (by weight):- (a) 70 - 98% of a hydrocarbon base; (b) 1 - 15% of a block copolymer which comprises at least one block tending to confer solubility in the base and at least one block tending to inhibit such solubility, the proportions of the blocks being such that the polymer shows a strong tendency to form a gel with the base; and (c) 1 - 15% of a hydrocarbon material that is miscible with the medium at high temperatures but forms solid dispersed particles on cooling at a temperature not lower than 65°C: the base (a) comprising: (i) 0 - 95% of a mineral oil with or without wax, for example in the form of petrolenm jelly; and (ii) 5 - 100% of a hydrocarbon or hydrocarbon mixture whose molecules are substantially incapable of diffusing into polyethylene, polypropylene or other cellular insulating material at temperatures of up to 80°C and, when mineral oil is present being soluble in it and having a low enough (number average). molecular weight to reduce significantly the osmotic pressure of the medium.
Claim 9
Dependent Claim
188 words
A fully-filled telecommunication cable distinguished by a filling medium comprising (by weight):- (a) 70 - 98% of a hydrocarbon base; (b) 1 - 15% of a block copolymer which comprises at least one block tending to confer solubility in the base and at least one block tending to inhibit such solubility, the proportions of the blocks being such that the polymer shows a strong tendency to form a gel with the base; and (c) 1 - 15% of a hydrocarbon material that is miscible with the medium at high temperatures but forms solid dispersed particles on cooling at a temperature not lower than 65°C: the base (a) comprising: (i) 0 - 95% of a mineral oil with or without wax, for example in the form of petrolenm jelly; and (ii) 5 - 100% of a hydrocarbon or hydrocarbon mixture whose molecules are substantially incapable of diffusing into polyethylene, polypropylene or other cellular insulating material at temperatures of up to 80°C and, when mineral oil is present being soluble in it and having a low enough (number average). molecular weight to reduce significantly the osmotic pressure of the medium.
Claim 10
Dependent Claim
24 words
A cable as claimed in Claim 7 in which the filling medium has a composition claimed in any one of Claims 2 to 6.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.