Resin composition having excellent surface smoothness

Patent metadata

Field	Value
Publication number	US-2016009908-A1
Application number	US-201414770435-A
Country	US
Kind code	A1
Filing date	Feb 25, 2014
Priority date	Feb 27, 2013
Publication date	Jan 14, 2016
Grant date	—

Abstract

Solved is the following problem: a PE based resin including a film grade ethylene-α-olefin copolymer is excellent in economic efficiency, but has a narrow molecular weight distribution in consideration for strength and heat sealability, and therefore causes surface roughening to occur when applied to a covering material for an insulated electric wire or cable. Applied is a polyolefin based resin composition including at least one polyethylene (PE) based resin, in which, when a ratio (I 10 /I 0.5 ) of an MFR (I 10 ) measured at 190° C. and a load of 10 kg to an MFR (I 0.5 ) measured at 190° C. and a load of 0.5 kg is defined as MFRR, a difference between the MFRR of the polyolefin based resin composition including at least one PE based resin and the MFRR of the PE based resin is 5 or more.

First claim

1 . A polyolefin based resin composition for covering insulated electric wire and cable, comprising at least one polyethylene (PE) based resin, wherein, when a ratio I 10 /I 0.5 of a melt flow rate (MFR) (I 10 ) measured at 190° C. and 10 kg to an MFR (I 0.5 ) measured at 190° C. and 0.5 kg is defined as a melt flow rate ratio (MFRR), a difference between an MFRR (A) of the polyolefin based resin composition comprising at least one PE based resin and an MFRR (a) of the PE based resin is 5 or more.

2 . The polyolefin based resin composition for covering insulated electric wire and cable according to claim 1 , wherein the PE based resin is an ethylene-α olefin copolymer, and a polyolefin based resin other than the PE based resin is a polypropylene (PP) based resin.

3 . The polyolefin based resin composition for covering insulated electric wire and cable according to claim 2 , wherein an MFR at 190° C. and a load of 2.16 kg of the PP based resin is 1 to 100 g/10 min.

4 . A resin covered wire, wherein the polyolefin based resin composition for covering insulated electric wire and cable according to claim 1 is used.

5 . A resin covered electric wire wherein the PE based resin recited in claim 1 and a polyolefin based resin other than the PE based resin are mixed immediately above an extruder, and subjected to extrusion.

6 . The resin covered electric wire according to claim 4 , wherein the polyolefin based resin other than the PE based resin comprises at least one of an antioxidant, carbon, a colorant and a lubricant.

7 . A method for manufacturing a resin covered electric wire comprising mixing the PE based resin recited in claim 1 and a polyolefin based resin other than the PE based resin immediately above an extruder, and subjecting the resultant mixture to extrusion.

8 . A resin covered wire, wherein the polyolefin based resin composition for covering insulated electric wire and cable according to claim 2 is used.

9 . A resin covered wire, wherein the polyolefin based resin composition for covering insulated electric wire and cable according to claim 3 is used.

10 . A resin covered electric wire wherein the PE based resin recited in claim 2 and a polyolefin based resin other than the PE based resin are mixed immediately above an extruder, and subjected to extrusion.

11 . A resin covered electric wire wherein the PE based resin recited in claim 3 and a polyolefin based resin other than the PE based resin are mixed immediately above an extruder, and subjected to extrusion.

12 . A method for manufacturing a resin covered electric wire comprising mixing the PE based resin recited in claim 2 and a polyolefin based resin other than the PE based resin immediately above an extruder, and subjecting the resultant mixture to extrusion.

13 . A method for manufacturing a resin covered electric wire comprising mixing the PE based resin recited in claim 3 and a polyolefin based resin other than the PE based resin immediately above an extruder, and subjecting the resultant mixture to extrusion.

Assignees

• Furukawa Electric Co Ltd
• Furukawa Electric Co Ltd

Inventors

• Chiba Hiroki
• Mizuno Koichi
• Shirai Tomoyuki

Classifications

• C08L23/0815 Primary

  with aliphatic 1-olefins containing one carbon-to-carbon double bond · CPC title

• H01B3/441

  from alkenes · CPC title

• H01B13/14

  by extrusion {(extrusion in general B29C48/00)} · CPC title

• C08L23/12

  Polypropene · CPC title

• C08L23/06 Primary

  Polyethylene · CPC title