JPS58212941A - Metallic wire coated with thermoplastic synthetic resin - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermoplastic synthetic resin coated metal wire. More specifically, the present invention relates to a metal wire closely coated with a layer of a specific thickness of a polyethylene isoterephthalate copolymer having a certain composition and having a determined intrinsic viscosity.

It is well known that metal wires are coated with thermoplastic resin.
Vinyl chloride and polyethylene coated metal wires are widely used in miscellaneous goods such as conductors, wires, fences, and bunkers. PVC polyethylene lacks toughness and weather resistance, so it is necessary to cover it with a layer more than one inch thick. It is well known that polyethylene terephthalate polymer films are strong, and the US IVJF
According to No. f 3829545, the metal wire contains 0.1 to 0.3
A method for coating polyethylene terephthalate with a thickness of m is described. However, for many applications, thinner coatings are advantageous, and in particular, thinner coatings are strongly desired in order to reduce weight, such as when used in motor windings. Hitherto, it has not been known to coat a metal wire with a thin thermoplastic resin coating of, for example, 10 to 80 microns.

The present invention provides a thermoplastic resin-coated metal wire that is thinner, has a coating that is sufficiently strong, and has good adhesion. That is, the present invention is a metal wire closely coated with a 5-100 micron thick layer of polyethylene isoterephthalate copolymer having an isophthalic acid component of 5-30 molar and an intrinsic viscosity of 07-1.0.

In the present invention, the polyethylene isoterephthalate copolymer of the coating layer contains 1.5 to 30 mol of isophthalate and has an intrinsic viscosity of 0.7 to 1.0. This polymer can be produced by known means such as transesterification and solid phase polymerization.

When the isophthalic acid component is low, for example, polyethylene terephthalate polymer has insufficient melt fluidity to obtain a thin coating layer1 and has poor adhesion to gold V4 wire. Nu,
If the isophthalic acid component is large, the stickiness during melting will be insufficient and the coating layer will become brittle, so the M of the isophthalic acid component is 5.
The amount is from 8 molti to 30 molti, preferably from 8 molti to 20 molti. In order to obtain a coated layer with a thickness of 5 to 100 microns, the intrinsic viscosity of one unit is 0.7 to 1.
Must be 0.

Using a gold wire made of iron, copper, etc., the surface of
Keep it clean by polishing or other means and apply coating. The metal wire can be coated by known means, such as a tube method or a pressure pressurization method. For example, the wire mesh wire sent out from the wire feeder is preferably placed in advance and heated to 180 to 270° C. in the L1 extruder 17, and then traced to a crosshead circle l17' for running the line. Then, the wire is covered with a polymer in a plastic state that is heated to a temperature of 20 to 50° C., the melting point, and extruded from an extruder, and the coated wire is cooled and wound into a roll by passing the coated wire through a water bath or the like. The thickness of the coating layer can be adjusted by adjusting the amount of extrusion of the polymer and the take-up speed of the metal wire. In this way, a metal wire coated with a strong coating with good adhesion of 5 to 100 microns is obtained.

Examples of the present invention will be described below.

Example 1 A steel wire with an outer diameter of 1 mm and a polished surface was heated to approximately 240 mm using a burner.
The product was copolymerized with 10 moles of isophthalic acid component, which was heated to 10°C and passed through a RAD die through a cloth attached to an extruder, and then melted and extruded from the RADDY into a cylinder at 280°C.
．． Coated with polyethylene isoterephthalate polymer of 91
L. After pouring water into the water pail, cool it down to 101 m/min.
It was wound at FI speed. The coating layer is substantially amorphous and has a thickness of 15 microns, and the coating is firmly fused to the surface of the 4 metal wire and does not lose its adhesion even when bent.

Patent applicant: Hideo Maise

Claims (1)

[Claims] Isophthalic acid component 5-30 molt, solid viscosity 07-10
The thickness of the polyethylene isoterephthalate copolymer is 5~
Metal wire closely coated with a 100 micron layer.