Polyvinyl chloride resin composition, electric wires and cables using the same

Abstract

To provide a polyvinyl chloride resin composition that significantly suppresses the generation of hydrogen chloride gas during combustion while offering high oil resistance and electrical characteristics required for insulation materials of wires and cables.SOLUTION: A polyvinyl chloride resin composition includes a polyvinyl chloride resin with a degree of polymerization of 1300 or more, a plasticizer including a polyester plasticizer that includes at least one of trimellitic acid ester and pyromellitic acid ester and has a viscosity of more than 800 mPa s at 25°C, and a stabilizer that includes at least one of tin zincate and zinc borate and includes surface-treated calcium carbonate. Relative to 100 pts.mass of the polyvinyl chloride resin, the polyester plasticizer is 5 pts.mass or more and less than 30 pts.mass.SELECTED DRAWING: None

Claims

1. A polyvinyl chloride resin having a degree of polymerization of 1300 or more, A plasticizer comprising a polyester-based plasticizer containing at least one trimellitic acid ester and a pyromellitic acid ester, and having a viscosity of 1500 mPa·s or more at 25°C, A stabilizer containing at least one of zinc stannate and zinc borate, and surface-treated calcium carbonate, The above-mentioned polyvinyl chloride resin contains 5 parts by mass or more and less than 30 parts by mass of the polyester-based plasticizer per 100 parts by mass of the polyvinyl chloride resin. A vinyl chloride resin composition comprising 45 to 75 parts by mass of the surface-treated calcium carbonate per 100 parts by mass of the vinyl chloride resin.

2. In the vinyl chloride resin composition according to claim 1, A vinyl chloride resin composition in which the trimellitic acid ester is trimellitris-2-ethylhexyl ester.

3. In the vinyl chloride resin composition according to claim 1, A vinyl chloride resin composition having a polyester-based plasticizer content of 10 parts by mass or more and 20 parts by mass or less.

4. In the vinyl chloride resin composition according to claim 1, A vinyl chloride resin composition wherein the degree of polymerization of the vinyl chloride resin is 1700 or more and 2500 or less.

5. In the vinyl chloride resin composition according to claim 1, Furthermore, a vinyl chloride resin composition comprising a phenolic compound as an antioxidant, a clay-containing compound as an insulating agent, and an antimony oxide compound as a flame retardant.

6. In the vinyl chloride resin composition according to claim 1, The vinyl chloride resin composition has a hydrogen chloride gas generation amount of 85 mg / g or less as defined in JCS 7397-4, a tensile elongation retention of 65% or more after immersion in IRM No. 902 oil at 85°C for 4 hours, and a volume resistivity of 2.0 × 10 in a 60°C atmosphere. １２ A vinyl chloride resin composition having properties of Ω·cm or greater.

7. In the vinyl chloride resin composition according to claim 1, A polyvinyl chloride resin composition for use as a covering for electric wires or cables.

8. A wire comprising a conductor and an insulating layer covering the conductor, An electric wire comprising a vinyl chloride resin composition, wherein the insulating layer contains a vinyl chloride resin having a degree of polymerization of 1300 or more, a plasticizer containing at least one trimellitic acid ester and pyromellitic acid ester and a polyester-based plasticizer having a viscosity of 1500 mPa·s or more at 25°C, and a stabilizer containing at least one zinc stannate and zinc borate and surface-treated calcium carbonate, wherein the composition contains 5 to less than 30 parts by mass of the polyester-based plasticizer and 45 to 75 parts by mass of the surface-treated calcium carbonate per 100 parts by mass of the vinyl chloride resin.

9. A cable comprising a conductor, an insulating layer covering the conductor, and a covering layer covering the insulating layer, A cable comprising a vinyl chloride resin composition in which the coating layer contains a vinyl chloride resin having a degree of polymerization of 1300 or more, a plasticizer containing at least one trimellitic acid ester and pyromellitic acid ester and a polyester-based plasticizer having a viscosity of 1500 mPa·s or more at 25°C, and a stabilizer containing at least one zinc stannate and zinc borate and surface-treated calcium carbonate, wherein the composition contains 5 to less than 30 parts by mass of the polyester-based plasticizer and 45 to 75 parts by mass of the surface-treated calcium carbonate per 100 parts by mass of the vinyl chloride resin.

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