Flame-retardant flexible polymer composition, and polymer tube and insulated wire formed from the polymer composition
AssigneesSumitomo Electric Industries, Ltd., Sumitomo Electric Fine Polymer, Inc.
InventorsTaro Fujita, Shinya Nishikawa, Hayato Aoi, Ryohei Fujita
Life of this patent
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Abstract
A flame-retardant flexible polymer composition includes a polymer component that contains 98 to 80 parts by mass of a chlorinated polyethylene and 2 to 20 parts by mass of a polyolefin polymer; and calcium hydroxide particles having a surface containing calcium silicate, wherein a content of the particles relative to 100 parts by mass of the polymer component is 5 parts by mass or more and 20 parts by mass or less. A polymer tube is formed from the flame-retardant flexible polymer composition. An insulated wire includes an insulation formed from the flame-retardant flexible polymer composition.
Claims3
A flame-retardant flexible polymer composition comprising:
- a polymer component that contains 98 to 90 parts by mass of a chlorinated polyethylene and 2 to 10 parts by mass of a polyolefin polymer;
- and
- calcium hydroxide particles having a surface containing calcium silicate,
- wherein a content of the particles relative to 100 parts by mass of the polymer component is 5 parts by mass or more and 10 parts by mass or less, and a chlorine content of the chlorinated polyethylene is 20% to 40% by weight,
- wherein the polyolefin polymer is a high-density polyethylene polymer having a density of 0.95 g/cm3 or more,
- wherein the flame-retardant flexible polymer composition does not include a zeolite compound,
- wherein the flame-retardant flexible polymer composition is irradiated with ionizing radiation to cross-link the polymer component, and
- wherein after the flame-retardant flexible polymer composition is irradiated with ionizing radiation to cross-link the polymer component, the flame-retardant flexible polymer composition has a heat resistance such that the polymer composition has a tensile strength >8.3 MPa and a tensile elongation >175% after being stored at 121° C. for seven days, and the flame-retardant flexible polymer composition has an oil resistance such that the polymer composition has a tensile strength >6.9 MPa and a tensile elongation >175% after being immersed in an aircraft hydraulic fluid conforming to Military Specification MIL-H-5606 at room temperature for a day.
A polymer tube produced by shaping a flame-retardant flexible polymer composition into a tube, the polymer composition including a polymer component that contains 98 to 90 parts by mass of a chlorinated polyethylene and 2 to 10 parts by mass of a polyolefin polymer and calcium hydroxide particles having a surface containing calcium silicate in which a content of the particles relative to 100 parts by mass of the polymer component is 5 parts by mass or more and 10 parts by mass or less, and a chlorine content of the chlorinated polyethylene is 20% to 40% by weight, wherein the polyolefin polymer is a high-density polyethylene polymer having a density of 0.95 g/cm3 or more;
- and by irradiating the polymer composition with ionizing radiation to cross-link the polymer component,
- wherein the flame-retardant flexible polymer composition does not include a zeolite compound, and
- wherein after the flame-retardant flexible polymer composition is irradiated with ionizing radiation to cross-link the polymer component, the flame-retardant flexible polymer composition has a heat resistance such that the polymer composition has a tensile strength >8.3 MPa and a tensile elongation >175% after being stored at 121° C. for seven days, and the flame-retardant flexible polymer composition has an oil resistance such that the polymer composition has a tensile strength >6.9 MPa and a tensile elongation >175% after being immersed in an aircraft hydraulic fluid conforming to Military Specification MIL-H-5606 at room temperature for a day.
An insulated wire comprising a conductor and an insulation covering the conductor, wherein the insulation is formed from a flame-retardant flexible polymer composition including a polymer component that contains 98 to 90 parts by mass of a chlorinated polyethylene and 2 to 10 parts by mass of a polyolefin polymer;
- and
- calcium hydroxide particles having a surface containing calcium silicate in which a content of the particles relative to 100 parts by mass of the polymer component is 5 parts by mass or more and 10 parts by mass or less, and a chlorine content of the chlorinated polyethylene is 20% to 40% by weight,
- wherein the polyolefin polymer is a high-density polyethylene polymer having a density of 0.95 g/cm3 or more,
- wherein the flame-retardant flexible polymer composition is irradiated with ionizing radiation to cross-link the polymer component in the insulation,
- wherein the flame-retardant flexible polymer composition does not include a zeolite compound, and
- after the flame-retardant flexible polymer composition is irradiated with ionizing radiation to cross-link the polymer component in the insulation, the flame-retardant flexible polymer composition has a heat resistance such that the polymer composition has a tensile strength >8.3 MPa and a tensile elongation >175% after being stored at 121° C. for seven days, and the flame-retardant flexible polymer composition has an oil resistance such that the polymer composition has a tensile strength >6.9 MPa and a tensile elongation >175% after being immersed in an aircraft hydraulic fluid conforming to Military Specification MIL-H-5606 at room temperature for a day.
Dependencies are inferred from the claim text.