Patent ID: 6534119
Filing Date: 2003-03-18
Classification: C08L,H01B

Abstract:
A process for producing a wire, wherein a relationship between a resin pressure P (kg/cm2), and a resin temperature T (Â° C.) , an extrusion rate K (kg/hour), a lip cross-section area of extruder A (cm2) and a melt flow rate of resin MFR (g/10 minutes) meets the following conditions when an insulating material is extrusion-coated onto a conductor or a conductor shielding layer:100Ã—{K/(MFR)1.5/(Tâˆ’120)/A}0.2&lE;P&lE;1000Ã—{K/(MFR)1.5/(Tâˆ’120)/A}0.2 wherein the insulating material comprising a copolymer of ethylene and an &agr;-olefin having 3 to 20 carbon atoms, wherein the ethylene/&agr;-olefin copolymer meets the following conditions (A) to (D):(A) a density (d) is 0.880 to 0.950 (g/cm3); (B) a melt flow rate (MFR) is 0.01 to 20 (g/10 minutes); (C) the relationship between decane soluble content (W (wt %)) at 23Â° C. and the density (d) is: when MFR&lE;10 (g/10 minutes), W<80Ã—exp{âˆ’100(dâˆ’0.88)}+0.1, when MFR>10 (g/10 minutes), W<80Ã—(MFRâˆ’9)0.26Ã—exp{âˆ’100(dâˆ’0.88)}+0.1; and(D) the relationship between a temperature (TM (Â° C.)) at a position of the highest peak of an endothermic curve as measured by a differential scanning calorimeter (DSC) and the density (d) is: Tm<400Ã—dâˆ’244.