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When the melt index of the polybutylene terephthalate is lower than 0.1 g/10 minutes, it is difficult to produce a liner by way of an extruder, and when the melt index exceeds 5 g/10 minutes, there's a tendency that the liner is well peeled off from the conduit due to the lack of toughness of the liner throughout forming the liner and that bodily properties equivalent to durability and abrasion resistance required for the liner are not easily exhibited. For example, in case the scarcity of lubricants is generated because of the lengthy period use of the control cable, there are some problems that the liner is completely worn down and the operationability of the control cable is excessively lowered, and the like. The present invention pertains to a control cable, and more particularly to a control cable wonderful in load efficiency, and the inside cable of which being able to be smoothly operated for a protracted period of time. The control cable of the current invention contains a conduit having flexibility, the inside surface of which being arrange with a liner and an internal cable having an internal coat, and the interior cable is inserted into the conduit in order that the inner cable freely slides in the conduit as mentioned above.

The control cable of the present invention comprises a conduit having flexibility, inside surface of which being fitted with a liner, and an interior cable having an inside coat, which is inserted into the conduit so that the inner cable free slides within the conduit. A control cable basically comprises a versatile conduit and a flexible inside cable which is inserted into the conduit in order to be freely slidden in and out, and is a means for remotely controlling a slave connected with the end of the inner cable by making use of a pulling operation, a pushing and pulling operation or the combination thereof to a different end of the inner cable. The inside cable usually contains a stranded wire produced by twisting plural metallic wires or a stranded wire of which surroundings are coated with a synthetic resin or bolstered by twisting flat steel wires across the stranded wire. Therefore, in some circumstances, as diclosed in Japanese Patent Unexamined Publication No. 231009/1985, a versatile tubular liner fabricated from a artificial resin is formed on the inside floor of the conduit. A thermoplastic resin shown in Tables 1 to 4 was heated to melt, and the organopolysiloxane obtained within the above was added thereto in a proportion proven in Tables 1 to 4. After they were uniformly kneaded, a liner having an inside diameter of 4.6 mm and an outside diameter of 5.6 mm was molded.

Among the above-talked about thermoplastic resins, polybutylene terephthalate having a melt index of 0.1 to 5 g/10 minutes will be notably preferably used as a result of the change of load effectivity is small when the control cable is used for a long period of time. When the melt index is more than 5 g/10 minutes, there's a tendency that oil resistance, stress cracking resistance and abrasion resistance deteriorate. When the content material of the organopolysiloxane having an ultra-high viscosity is much less that 45% by weight and the content material of the organopolysiloxane having a lower viscosity is more that 55% by weight, an extruded product cannot be produced because a slide between a screw and a resin happens in an extruder and the feed of the resin cannot be carried out. When the content material of the organopolysiloxane having an ultra-excessive viscosity is more than 85% by weight and the content material of the organopolysiloxane having a decrease viscosity is much less that 15% by weight, the results do not differ a lot from the consequences when the organopolysiloxane having an extremely-high viscosity is used solely, and the advance of load effectivity is little. It is particularly preferable that the content material of the organopolysiloxane having an ultra-excessive viscosity is 50 to 80% by weight and the content material of the organopolysiloxane having a decrease viscosity is 50 to 20% by weight.

In the present invention, for the reason that organopolysiloxane having an extremely-high viscosity and the organopolysiloxane having a decrease viscosity are dispersively contained within the thermoplastic resin used in the above-mentioned liner, it is in fact that there isn't any necessity to use a lubricant between the interspace of the conduit and the inside cable, and an excellent operate that the sliding operation of the conduit and the inner cable can be easily carried out for a protracted time frame, is exhibited. Further, it may be seen that the control cable produced in Example 5, during which organopolysiloxane was dispersively contained in thermoplastic resins of both the liner and the interior coat, has physical properties nearly equal to the control cables produced in other Examples, in which organopolysiloxane was dispersively contained only within the thermoplastic resin of the liner. The polybutylene terephthalate additionally has a characteristic that the distinction of the initial load efficiency and the load efficiency after the control cable is operated for a long period of time is small. However, there are a number of problems, in the control cable by which a lubricant is used, equivalent to problem of operation for coating because dispersion of the load effectivity of merchandise is attributable to the unevenness of a coating, rubbishes and dusts are easily adhered to the lubricant when applying the lubricant to the control cable, and drip and the like are generated.