ELECTRIC CABLE OR WIRE CARRYING INSULATION AND PROCESS OF ITS MANUFACTURE Russian patent published in 2004 - IPC

FIELD: insulation of electric wires.

SUBSTANCE: electric wire or cable carrying insulation containing first layer which is composition based on polyolephine that includes at least 20 per cent by mass, preferably 40 to 60 per cent by mass and at least 80 per cent by mass of polymer part of above-mentioned composition comprising carbonyl-containing polymer ( homopolymer or copolymer or triple polymer) which at least one polymer or one comprising monomer is complex ester of carbolic acid, preferably acrylate or acetate, specifically alkyl acrylate ( basically, methyl acrylate, ethyl acrylate, propyl acrylate or butyl acrylate ). Mentioned monomer amounts to at least 5 per cent by mass and preferably 9 to 15 per cent by mass of specified copolymer or triple copolymer. The rest or larger part of specified copolymer or triple copolymer preferably is derivative of elephant monomer, preferably ethylene. Second layer of another composition of material amounts to at least 10 per cent by mass, preferably 50 to 90 per cent by mass or entire 100 per cent by mass or polyvinylidenfluoride (PVDF) or especially copolymer based on vinyllidenfluoride (VDF) with partially or fully fluorinated comonomer, preferably of entire copolymer VDF and hexafluoropropylene (HFP). Above-mentioned layers 1 and 2 contacting one another were subjected to effects of reaction of intermolecular cross-links mainly by irradiation, preferably by ionizing radiation which is sufficient to prevent separation of these two layers in the course of test by submergence for one hour into acetone at temperature 23 C or adhesion strength between mentioned layers can be raised during ply separation up to value amounting to 5 as minimum in correspondence with method of American Society of Tests of Materials(ASTM). Adhesion bond was tested by increasing resistance to separation by 50 per cent, preferably by 100 per cent or especially by 500 or 1000 per cent as compared with resistance to peeling of layers without formation of intermolecular cross-links.

EFFECT: obtainment of sufficient strength property of chemical bond which ensures abrasion resistance of insulation to peeling and boiling with heating.

21 cl, 5 tbl