The current invention pertains to a control cable, and extra particularly to a control cable wonderful in load efficiency, and the inside cable of which with the ability to be easily operated for a protracted period of time. Among the many above-mentioned thermoplastic resins, polybutylene terephthalate having a melt index of 0.1 to 5 g/10 minutes can be notably ideally used because the change of load efficiency is small when the management cable is used for a long time period. In the present invention, for the reason that organopolysiloxane having an extremely-excessive viscosity and the organopolysiloxane having a lower viscosity are dispersively contained within the thermoplastic resin used within the above-talked about liner, it's of course that there isn't a necessity to use a lubricant between the interspace of the conduit and the inner cable, and an excellent operate that the sliding operation of the conduit and the interior cable can be smoothly carried out for a protracted time period, is exhibited. On the other hand, a considerable amount of the organopolysiloxane having a high viscosity will be contained in the resin, and the molding may be carried out with out slipping.
When the kinematic viscosity exceeds 10000 cSt, the organopolysiloxane does not bleed out from the thermoplastic resin sufficiently, and the load efficiency is lowered. However, when a organopolysiloxane having too low a viscosity is contained in a big amount in the resin, there's a problem that the organopolysiloxane can't be successfully extruded to produce a liner, and thus the molding cannot be carried out due to the slipping of the resin on the cylinder barrel within the extruder. The amounts of the organopolysiloxane having an ultra-excessive viscosity and the organopolysiloxane having a lower viscosity contained within the thermoplastic resin of the above-mentioned liner are adjusted so that the organopolysiloxane is composed of forty five to 85% by weight of the organopolysiloxane having an ultra-excessive viscosity and fifty five to 15% by weight of the organopolysiloxane having a decrease viscosity. As an example, a way comprising ading the organopolysiloxane having an ultra-excessive viscosity and the organopolysiloxane having a lower viscosity individually to the thermoplastic resin whereas heating and kneading the thermoplastic resin and uniformly dispersing them, a technique comprising including the organopolysiloxane, which is beforehand prepared by mixing the organopolysiloxane having an ultra-high viscosity and the organopolysiloxane having a lower viscosity in a prescribed proportion, to the melted thermoplastic resin and uniformly dispersing them, and the like will be exemplified.
To the organopolysiloxane, as an illustration, an antioxidant, a corrosion inhibitor, extreme stress additives and the like may be added as occasion calls for. Because the above-talked about organopolysiloxane having an extremely-excessive viscosity, a linear organopolysiloxane, a branched organopolysiloxane and the like will be exemplified. In order to enhance the load effectivity of a control cable with no lubricant, an organopolysiloxane is contained in a resin for a liner or an internal coat, and the organopolysiloxane extides from on the floor of the resin. However, there are a number of issues, within the control cable through which a lubricant is used, corresponding to problem of operation for coating because dispersion of the load efficiency of products 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. However, when the viscosity of the organopolysiloxane is simply too excessive, the amount of the organopolysiloxane which is extided from the surface of the resin is little, and according the load effectivity and durability of the management cable cannot be improved sufficiently.
However, in such a control cable, frictional resistance will increase when the conduit is directly contacted with the internal cable. The polyoxymethylene also has properties reminiscent of low stickslip beneath a high load and improves the operationability of a control cable. When the melt index of the polybutylene terephthalate is lower than 0.1 g/10 minutes, it's troublesome to produce a liner by the use of an extruder, and when the melt index exceeds 5 g/10 minutes, there's a tendency that the liner is definitely peeled off from the conduit as a result of lack of toughness of the liner throughout forming the liner and that physical properties comparable to sturdiness and abrasion resistance required for the liner are usually not simply exhibited. As a cloth used within the liner, for instance, a artificial resin reminiscent of polyethylene, polyoxymethylene, polybutylene terephthalate or polytetrafluoroethylene is used. Examples of the thermoplastic resin used within the above-talked about liner are, for instance, polybutylene terephthalate, polyoxymethylene, polyamide represented by 1-nylon and 6,6-nylon, and the like, but the present invention is not restricted to the exemplified ones and other thermoplastic resins can be used as far as the thing of the current invention will be accomplished.
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