Halogen-free crosslinked resin composition and insulated wire and cable using the same

Patent metadata

Field	Value
Publication number	US-9805840-B2
Application number	US-201314084364-A
Country	US
Kind code	B2
Filing date	Nov 19, 2013
Priority date	Nov 20, 2012
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

A halogen-free crosslinked resin composition includes a base polymer including as a main component (a) an ethylene vinyl acetate copolymer and (b) an acid modified polyolefin resin having a differential scanning calorimetry glass transition temperature Tg of not higher than −55 degrees Celsius in a mass ratio (a):(b) of 70:30 to 100:0, the base polymer including 50 to 70% by mass of vinyl acetate, 0.5 to 10 parts by mass of a silicone rubber with respect to 100 parts by mass of the base polymer, and 100 to 250 parts by mass of a metal hydroxide with respect to 100 parts by mass of the base polymer.

First claim

What is claimed is:

1. A halogen-free crosslinked resin composition, consisting of:
a base polymer including as a main component (a) an ethylene vinyl acetate copolymer and (b) an acid modified polyolefin resin having a differential scanning calorimetry glass transition temperature Tg of not higher than −55 degrees Celsius in a mass ratio (a):(b) of 70:30 to 90:10, the base polymer including 50 to 70% by mass of vinyl acetate;
0.5 to 10 parts by mass of a silicone rubber with respect to 100 parts by mass of the base polymer; and
100 to 250 parts by mass of a metal hydroxide with respect to 100 parts by mass of the base polymer,
wherein the acid modified polyolefin resin has a melting point of not more than 90 degrees Celsius.

2. The halogen-free crosslinked resin composition, according to claim 1 , wherein the ethylene vinyl acetate copolymer comprises two or more kinds of ethylene vinyl acetate copolymers which are different in melt mass flow rate, and
wherein 5% to 20% by mass of the ethylene vinyl acetate copolymer has a melt mass flow rate of not less than 15 g/10 min.

3. The halogen-free crosslinked resin composition, according to claim 1 , wherein 5% to 20% by mass of the ethylene vinyl acetate copolymer has a melt mass flow rate of not less than 15 g/10 min.

4. The halogen-free crosslinked resin composition, according to claim 1 , wherein the ethylene vinyl acetate copolymer comprises two or more kinds of ethylene vinyl acetate copolymers which are different in melt mass flow rate, and
wherein 5% to 15% by mass of the ethylene vinyl acetate copolymer has a melt mass flow rate of not less than 15 g/10 min.

5. The halogen-free crosslinked resin composition, according to claim 1 , wherein the ethylene vinyl acetate copolymer comprises two or more kinds of ethylene vinyl acetate copolymers which are different in melt mass flow rate, and
wherein 5% to 10% by mass of the ethylene vinyl acetate copolymer has a melt mass flow rate of not less than 15 g/10 min.

6. The halogen-free crosslinked resin composition, according to claim 1 , wherein the acid modified polyolefin resin comprises an acid modified compound of at least one of ultra-low density polyethylene, ethylene methyl acrylate copolymer, ethylene ethyl acrylate copolymer, ethylene-butene-1 copolymer, ethylene-hexene-1 copolymer, and ethylene-octene-1 copolymer.

7. The halogen-free crosslinked resin composition, according to claim 6 , wherein an acid that is used in the acid modified polyolefin resin comprises one of maleic acid, maleic anhydride, and fumaric acid.

8. The halogen-free crosslinked resin composition, according to claim 1 , wherein an acid that is used in the acid modified polyolefin resin comprises one of maleic acid, maleic anhydride, and fumaric acid.

9. The halogen-free crosslinked resin composition, according to claim 1 , wherein the silicone rubber is in a range from 0.5 to 7.5 parts by mass with respect to 100 parts by mass of the base polymer.

10. The halogen-free crosslinked resin composition, according to claim 1 , wherein the silicone rubber is in a range from 0.5 to 5 parts by mass with respect to 100 parts by mass of the base polymer.

11. The halogen-free crosslinked resin composition, according to claim 10 , wherein the mass ratio (a):(b) is in a range from 80:20 to 90:10.

12. The halogen-free crosslinked resin composition, according to claim 1 , wherein the silicone rubber comprises one of dimethyl polysiloxane, methyl vinyl polysiloxane, and methyl phenyl polysiloxane.

13. The halogen-free crosslinked resin composition, according to claim 1 , wherein the metal hydroxide is in a range from 100 to 150 parts by mass of with respect to 100 parts by mass of the base polymer.

14. The halogen-free crosslinked resin composition, according to claim 1 , wherein the mass ratio (a):(b) is in a range from 80:20 to 90:10.

15. An insulated wire covered with an insulating layer comprising the halogen-free crosslinked resin composition according to claim 1 .

16. An insulated wire covered with an insulating layer comprising the halogen-free crosslinked resin composition according to claim 2 .

17. A cable comprising the insulated wire according to claim 15 .

18. A cable comprising the insulated wire according to claim 16 .

19. A cable covered with a sheath comprising the halogen-free crosslinked resin composition according to claim 1 .

20. A cable covered with a sheath comprising the halogen-free crosslinked resin composition according to claim 2 .

Assignees

• Hitachi Metals Ltd

Inventors

• Iwasaki Makoto
• Kimura Hitoshi

Classifications

• C08L23/0853

  Ethylene vinyl acetate copolymers · CPC title

• C08L19/00

  Compositions of rubbers not provided for in groups C08L7/00 - C08L17/00 · CPC title

• H01B3/46

  silicones · CPC title

• H01B3/446 Primary

  from vinylacetals · CPC title

• H01B3/448

  from other vinyl compounds · CPC title