METHOD FOR PRODUCING ELECTRIC WIRE, METHOD FOR PRODUCING MOLDED ARTILE, AND METHOD FOR PRODUCING RESIN MATERIAL CONTAINING MODIFIED FLUORORESIN

摘要

To provide a production method capable of improving the abrasion resistance of an electric wire or molded article using a fluororesin, by electron beam irradiation in air at a temperature where the fluororesin does not melt, and a method for producing a resin material containing a modified fluororesin whereby an electric wire or a molded article excellent in abrasion resistance can be obtained. A method for producing an electric wire, which comprises a step of irradiating an electron beam to an insulating layer containing a fluororesin and covering a conductor, to form an insulating layer containing a modified fluororesin, characterized in that the fluororesin has a crystalline melting point of at least 260° C., contains either one or both of a structural unit (a) having a carbonyl group-containing group and a main chain terminal group (a′) having a carbonyl group-containing group, and a structural unit (b) based on a perfluoromonomer and does not contain a structural unit based on a hydrocarbon monomer (but excluding the structural unit (a)), and irradiation of the electron beam is conducted under conditions of a temperature of less than the crystalline melting point of the fluororesin and in air, to satisfy at least one of the following (1) to (3):;0.5≦Mb/Ma<1.2   (1);wherein Ma represents a melt flow rate (g/10 min) of the fluororesin prior to the electron beam irradiation, and Mb represents a melt flow rate (g/10 min) of the fluororesin after the electron beam irradiation,;1≦Tb−Ta<6.5   (2);wherein Ta represents a crystalline melting point (° C.) of the fluororesin prior to the electron beam irradiation, and Tb is a crystalline melting point (° C.) of the fluororesin after the electron beam irradiation,;irradiation dose of less than 30 kGy.   (3)

主权项

1. A method for producing an electric wire comprising a conductor and an insulating layer containing a fluororesin and covering the surface of the conductor, which comprises a step of irradiating an electron beam to the insulating layer containing a fluororesin and covering the surface of the conductor, to modify at least part of the fluororesin to a modified fluororesin thereby to form an insulating layer containing the modified fluororesin, characterized in that
the fluororesin has a crystalline melting point of at least 260° C., contains either one or both of a structural unit (a) having a carbonyl group-containing group and a main chain terminal group (a′) having a carbonyl group-containing group, and a structural unit (b) based on a perfluoromonomer (but excluding the structural unit (a)) and does not contain a structural unit based on a hydrocarbon monomer (but excluding the structural unit (a)), and irradiation of the electron beam is conducted under conditions of a temperature of less than the crystalline melting point of the fluororesin and in air, to satisfy at least one of the following (1) to (3):
0.5≦Mb/Ma<1.2   (1)wherein Ma represents a melt flow rate (g/10 min) of the fluororesin prior to the electron beam irradiation, and Mb represents a melt flow rate (g/10 min) of the fluororesin after the electron beam irradiation,
1≦Tb−Ta<6.5   (2)wherein Ta represents a crystalline melting point (° C.) of the fluororesin prior to the electron beam irradiation, and Tb is a crystalline melting point (° C.) of the fluororesin after the electron beam irradiation,
irradiation dose of less than 30 kGy.   (3)