Filling composition for cables
AssigneeKraton Polymers LLC
InventorsHendrik de Groot, Mark Govert Kalisvaart, Robert Bening, Huixian Yang
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Abstract
A filling composition is disclosed, the composition comprises (i) between 4 to 20 wt. % of a selectively hydrogenated isoprene-styrene block copolymer having a structure S-EP with at least 40 wt. % polystyrene content, a total diblock apparent molecular weight of at least 160 kg/mole, the polystyrene block S has a true molecular weight in the range of 60 to 110 kg/mole, and the polyisoprene block (EP) has a molecular weight in the range of 80-100 kg/mole, (ii) an oil, and (iii) optional additives. The filling composition is characterized as having a thixotropic ratio of 2-10, a drop point of at least 200° C., and a cone penetration at 25° C. of <500 dmm.
Claims14
A filling composition comprising:
- a selectively hydrogenated isoprene-styrene block copolymer having a structure S-EP with at least 44 wt. % polystyrene content, a total diblock apparent molecular weight of at least 160 kg/mole, the polystyrene block S has a true molecular weight in the range of 60 to 110 kg/mole, and the polyisoprene block (EP) has a true molecular weight in the range of 80-100 kg/mole;
- 80 wt. % to 96 wt. % of an oil selected from a paraffinic oil, oil-enriched in paraffin, a mineral oil, a Fischer-Tropsch derived oil, a synthetic oil, or mixtures thereof;
- optional additives;
- and
- wherein the filling composition has a thixotropic ratio of 2-10, a drop point of at least 200° C., and a cone penetration at 25° C. of less than 400 dmm.
A method for making a filling composition comprising dissolving a selectively hydrogenated isoprene-styrene block copolymer in an oil selected from a paraffinic oil, oil-enriched in paraffin, a mineral oil, a Fischer-Tropsch derived oil, a synthetic oil, or mixtures thereof,
- wherein the selectively hydrogenated isoprene-styrene block copolymer having a structure S-EP with at least 44 wt. % polystyrene content, a total diblock apparent molecular weight of at least 160 kg/mole, the polystyrene block S has a true molecular weight in the range of 60 to 110 kg/mole, and the polyisoprene block (EP) has a true molecular weight in the range of 80-100 kg/mole;
- wherein the oil is present in an amount of 80 wt. % to 96 wt. %, based on the total weight of the composition;
- and
- wherein the filling composition has a thixotropic ratio of 2-10, a drop point of at least 200° C., and a cone penetration at 25° C. of less than 400 dmm.
Dependencies are inferred from the claim text.