Communication cable with plastic-insulating veins

PATENT OFFICE PATENT SPECIFICATION No. 263880 class. 21 el 16 Int. ¢1H O1 b expenditure day: 12. August 1968 SIEMENS SHARES ESELLSCHAFT IN BERLIN AND MUNICH communication cable with kunststoffisofierten veins patent of amendment to the patent Nr.256209. Announced at the 3.Oktober 1966 (A 9234/66); Priority of the registration in Germany from 20-October 1965 (S 100133 VIIId/21c) stresses. Beginning of the patent duration: 15.November 1967. Longest possible duration: 14.Dezember 1984. The subject of the original patent is a communication cable with plastic-insulating veins and a protection planned in distances in relation to the axial propagation of humidity or water, with which into the cable core umschlossene of a coat in distances under effect of humidity and/or or water is brought in for size that by sources its volume around a multiple material. By the use of such a pourable material as Feuchtlgkeitsbarriere in longitudinal direction of the cable in the case of disturbance when the penetration humidity and/or or water is reached by the swelling of the material completely more closely a conclusion of the Kabelabschnittes concerned. In Weiterbfldung of the original patent the invention plans the networking product of a Epihalohydrins, preferably epichlorohydrin, as cluellf'ähigen material and a Polysaccharides with a molecular weight of 500 to 10000, preferably from 500 to 2000. In the original patent already the use of a mixture from interlaced Dextran, Bentone and methanol is mentioned as Ausftihrungsbeispiel flir a pourable body. With this interlaced Dextran, like it under the trade name “Sephadex” is manufactured by the company Pharmacia, Uppsala, Sweden, concerns it a macromolecular Polysaccharid with a molecular weight of approximately 75000 and more highly, which is developed by microorganisms from glucose and interlaced afterwards. This so far primarily in the medicine used connection is therefore extraordinarily expensive. The invention is based to that against fibre on the realization that for the production of quellf'älfiger bodies, which can be begun as check plugs in communication cables trained in accordance with the original patent exhibiting and therefore cheaper connections can a substantially smaller molecular weight be used, which have a large degree of expansion in interlaced condition and with water extraordinarily fast to swell. Resulting, still stärkeährdiche, to the Durchf'ührung of the invention thought suitable Polysaccharide of middle molecular weight are in particular reduced water-soluble strength as well as Dextrine, i.e. with the Stärkeabbau as by-product, however already water-soluble Polysaccharide of middle molecule size. These organic compounds, which are soluble actually at least to certain extent in water, are after the networking with a Epihalohydrin, preferably with epichlorohydrin, in water still pourable, but no longer soluble. As a function of the networking degree the Volumenzunahme such pourable bodies in water amounts to for instance the 3bis 10-laughs the output volume. For the invention at the basis lying setting of tasks it is substantial that this Volumenzunahme takes place when penetration humidity and/or water spontaneously, so that into the cable brought in pourable bodies already angequollen in few seconds on a repeated of its volume are. The networking of the indicated materials with a Epihalohydrin, preferably with epichlorohydrin, takes place appropriately in an alkaline medium. With the Vemetzung developing gel is neutralized to a paste-like substance to grind, and dialysiert, dried then for the distance of the salts developing as by-product and husbands. A pourable body, which proved in the context of the Erf'mdung as particularly favorable, can be manufactured for example in the following way: I000 g Dextrin are angeneigt with 500 g acetone, this mixture is then given in 2130 rrd 4,2%ige soda-long and mixed to a homogeneous solution. After the cooling on room temperature 122 is under-mixed ml epichlorohydrin and the beginning 24 h at room temperature is let stand. As networking product thereby a firm Ge1 which is verrnahlen in the Retschmühle to a paste-like substance and neutralized with wässedger hydrochloric acid, develops. For the distance of the formed salts this paste is dialysiert, dried with 110° on sheet metals and afterwards husbands. The powder become in such a way has a Quell£aktor from approximately 5 to 6. opposite water. In the context of the invention know manufactured pourable bodies in powdered condition into that! 0 cables to be brought in, whereby as substrate a vaselineartäge paste on Kohlenwasserstoffund is used and/or or silicone basis, as it is suggested for example in the original patent. A particularly favourable kind of bringing the queU£ähigen body into the cable consists however of using as substrate with water mixable viscose rayon liquids, as for example Glyeefin or Tdglykol. In the context of the invention by interlacing with a Epihalohydrin, in particular with epichlorohydrin, manufactured pourable body ignore by mixing with these soaking means into a rubber-like condition, which shows a further substantial Volumenzunahme then during influence of water. For example if the body in the powdered condition in the relationship 2:1 with Glycerin or another polyole, manufactured in the procedure by interlacing Dextdn with epichlorohydrin, described in the example, is mixed, then min a rubber-like mass after approximately 30, which ancluiUt with further Wasserzugabe on the 4,5bis 6-lache of their output volume, develops. Into the soul of a Nachrichtertkabels of brought in plugs from such a rubber-like material has the Vortel! , dafl it is no longer localvariable and also with extreme Biegebeanspmchungen of the cable not to shift can.