US-20260128194-A1 - ELECTRIC WIRE, METHOD FOR PRODUCING ELECTRIC WIRE, AND MASTERBATCH

US20260128194A1US 20260128194 A1US20260128194 A1US 20260128194A1US-20260128194-A1

Abstract

The present disclosure provides an electric wire having excellent smoothness, appearance, and storage stability. The electric wire includes a core wire and a coating layer covering the core wire. The coating layer contains a fluorine-free resin and a fluorine-containing crystalline polymer. The fluorine-free resin includes at least one selected from the group consisting of polyamide resins, polyolefin resins, and polyvinyl chloride resin. The fluorine-containing crystalline polymer represents 0.5 to 4.0 mass % relative to the fluorine-free resin.

Inventors

Wade Martin SIMPSON
Kazuki SAKAMI
Shinji Murakami
Kazuya Kawahara

Assignees

DAIKIN AMERICA, INC.
DAIKIN INDUSTRIES, LTD.

Dates

Publication Date: 20260507
Application Date: 20251230

Claims (2)

1 . A method for producing a power cable comprising a core wire and a coating layer covering the core wire, the method comprising the steps of: (1) mixing a masterbatch containing a fluorine-free resin and a fluorine-containing crystalline polymer with a fluorine-free resin to provide a coating composition; and (2) melt-extruding the coating composition onto the core wire to form the coating layer on the core wire, the fluorine-containing crystalline polymer in the masterbatch representing 5.0 to 50.0 mass % relative to the fluorine-free resin in the masterbatch, the fluorine-containing crystalline polymer in the coating layer representing 0.5 to 4.0 mass % relative to the fluorine-free resin in the coating layer.
2 . A masterbatch for forming a coating layer on a core wire of an electric wire, the masterbatch comprising a fluorine-free resin and a fluorine-containing crystalline polymer, the fluorine-free resin including at least one selected from the group consisting of polyamide resins, polyolefin resins, and polyvinyl chloride resin, the fluorine-containing crystalline polymer representing 5.0 to 50.0 mass % relative to the fluorine-free resin.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a Rule 53(b) Divisional of U.S. application Ser. No. 15/854,490 filed Dec. 26, 2017, which is a Continuation-in-Part of PCT/US2017/040038 filed Jun. 29, 2017, which claims benefit of Provisional Application No. 62/357,830 filed Jul. 1, 2016, the above-noted applications are incorporated herein by reference in their respective entirety. FIELD OF THE DISCLOSURE The present disclosure relates to electric wires, methods for producing electric wires, and masterbatch. BACKGROUND Installation of power cables used in fields such as the telecommunication field and the construction infrastructure field involves insertion of cables into pipes. However, conventional cables have an outer surface with a high coefficient of friction and generate a high resistance when inserted into pipes. Thus, such cables may be damaged during the work, which means poor insertion workability. In order to solve the above problem, Patent Literature 1 (US 2016/0012945 A1) and Patent Literature 2 (JP 2013-251270 A) achieved reduction in coefficient of friction of cables by adding a fatty acid amide such as erucamide or silicone oil during formation of cables and allowing the fatty acid amide or silicone oil to bleed on the surface, thereby improving the smoothness of the cables against pipes. SUMMARY An electric wire having excellent smoothness, appearance, and storage is provided. In a first aspect, an electric wire is provided, comprising a core wire and a coating layer covering the core wire, the coating layer containing a fluorine-free resin and a fluorine-containing crystalline polymer, the fluorine-free resin including at least one selected from the group consisting of polyamide resins, polyolefin resins, and polyvinyl chloride resin, the fluorine-containing crystalline polymer representing 0.5 to 4.0 mass % relative to the fluorine-free resin. In a second aspect, a method for producing an electric wire is provided, the method comprising the steps of: (1) mixing a masterbatch containing a fluorine-free resin and a fluorine-containing crystalline polymer with a fluorine-free resin to provide a coating composition; and (2) melt-extruding the coating composition onto a core wire to form a coating layer on the core wire, the fluorine-free resin including at least one selected from the group consisting of polyamide resins, polyolefin resins, and polyvinyl chloride resin, the fluorine-containing crystalline polymer in the masterbatch representing 5.0 to 50.0 mass % relative to the fluorine-free resin in the masterbatch, the fluorine-containing crystalline polymer in the coating layer representing 0.5 to 4.0 mass % relative to the fluorine-free resin in the coating layer. In a third aspect, a masterbatch for forming a coating layer on a core wire of an electric wire is provided, the masterbatch comprising a fluorine-free resin and a fluorine-containing crystalline polymer, the fluorine-free resin including at least one selected from the group consisting of polyamide resins, polyolefin resins, and polyvinyl chloride resin, the fluorine-containing crystalline polymer representing 5.0 to 50.0 mass % relative to the fluorine-free resin. The above presents a simplified summary in order to provide a basic understanding of some aspects of the claimed subject matter. This summary is not an extensive overview. It is not intended to identify key or critical elements or to delineate the scope of the claimed subject matter. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1. Percentage weight loss from peanut oil (4:1 FA/StA)/HDPE thermoplastic blends after 28 days at 50° C. FIG. 2. Graph displays % residual cat food in pouches: PP control, 1% PFTE/PP, and 1% EFEP/PP. FIG. 3. Fixture used for extrusion: 36 in. long stainless steel tubing (⅜ in. diameter), with 5×90° bends and at least 3 unions for assembly and disassembly. FIG. 4. Comparison of average stress of polyamide 6 (PA-6) and PA-6blends during extrusion: PA-6 (control), 1% PFTE/PA-6, and 1% FEP/PA-6. FIG. 5. Discoloration of films after heating bags containing spaghetti sauce in a 900 watt microwave for 3 minutes: PP control, 1% PFTE/PP, 1% (PTFE/EFEP)/PP, and 1% EFEP/PP. FIG. 6. Adherence of soil to samples: PVC control, 0.04% (FA/StA)/PVC, 0.08% (FA/StA)/PVC, and 1% (FA/StA)/PVC. FIG. 7. Plotted residual percentages for Pouches D-G and the control. The diamond plot line shows residual percentages for a pouch formed of PP as a primary polymer and various combinations of EFEP+FEP as additive polymers. The box plot line shows residual percentages for a pouch formed of PP as a primary polymer and various combinations of EFEP+PTFE as additive polymers. The control pouch had a residual percentage of approximately 11.4% (indicated by the arrow). FIG. 8. Adherence of wet cat food pieces pouches prepared from 1% PTFE i