Thermoplastic resin composition for radar cover

Patent metadata

Field	Value
Publication number	US-2016355670-A1
Application number	US-201414430817-A
Country	US
Kind code	A1
Filing date	Dec 5, 2014
Priority date	Dec 6, 2013
Publication date	Dec 8, 2016
Grant date	—

Abstract

Provided is a thermoplastic resin composition for a radar cover which exhibits excellent mechanical properties as well as a good balance between electromagnetic reflection loss and electromagnetic penetration loss, which is required for a radar protection, by including 85 wt % to 95 wt % of a thermoplastic resin, 1 wt % to 5 wt % of carbon nanotubes, and 3 wt % to 10 wt % of carbon black, wherein a weight ratio of the carbon nanotubes to the carbon black is in a range of 3:7 to 1:7.

First claim

1 . A thermoplastic resin composition for a radar cover, the thermoplastic resin composition comprising:
85 wt % to 95 wt % of (a) a thermoplastic resin; 1 wt % to 5 wt % of (b) carbon nanotubes; and 3 wt % to 10 wt % of (c) carbon black, wherein a weight ratio of the carbon nanotubes to the carbon black is in a range of 3:7 to 1:7.

2 . The thermoplastic resin composition for a radar cover of claim 1 , wherein the (a) thermoplastic resin comprises any one selected from the group consisting of a polyamide resin, a polyimide resin, a polyamideimide resin, a polyacetal resin, a polycarbonate resin, a polyethersulfone resin, a polyether ketone resin, a polyetherimide resin, a polyalkylene terephthalate resin, an acryl-based resin, a polysulfone resin, a polyphenylene sulfide, a polyolefin, a polystyrene resin, a syndiotactic polystyrene resin, an acrylonitrile butadiene styrene resin, a polyphenylene oxide resin, a liquid crystal polymer resin, and a copolymer thereof, or a mixture of two or more thereof.

3 . The thermoplastic resin composition for a radar cover of claim 1 , wherein the (a) thermoplastic resin comprises a polyamide resin having a melt index of 50 g/min to 65 g/min under conditions including a temperature of 300° C. and a load of 10 kg.

4 . The thermoplastic resin composition for a radar cover of claim 1 , wherein the (a) thermoplastic resin comprises any one selected from the group consisting of a crystalline polyamide, a semicrystalline polyamide, and an amorphous polyamide, or a mixture of two or more thereof.

5 . The thermoplastic resin composition for a radar cover of claim 1 , wherein the (b) carbon nanotubes comprise any one selected from the group consisting of single-walled carbon nanotubes, double-walled carbon nanotubes, and multi-walled carbon nanotubes, or a mixture of two or more thereof.

6 . The thermoplastic resin composition for a radar cover of claim 1 , wherein the (b) carbon nanotubes have an average inner diameter of 0.5 nm to 10 nm.

7 . The thermoplastic resin composition for a radar cover of claim 1 , wherein the (c) carbon black comprises spherical carbon particles having an average particle diameter (D 50 ) of 10 μm to 200 μm.

8 . The thermoplastic resin composition for a radar cover of claim 1 , wherein the weight ratio of the (b) carbon nanotubes to the (c) carbon black is in a range of 1:3 to 1:7.

9 . The thermoplastic resin composition for a radar cover of claim 1 , wherein the thermoplastic resin composition comprises 1 part by weight to 5 parts by weight of the (b) carbon nanotubes and 5 parts by weight to 8 parts by weight of the (c) carbon black based on 100 parts by weight of the (a) thermoplastic resin.

10 . A radar cover comprising a resin that is prepared from the thermoplastic resin composition of claim 1 .

11 . The radar cover of claim 10 , wherein the resin has an electromagnetic reflection loss of 2 dB to 9 dB and an electromagnetic interference shielding effectiveness of 3 dB to 12 dB.

12 . A radar comprising the radar cover of claim 10 .

Assignees

• Lg Chemical Ltd

Inventors

• Lee Su Min
• Choi Yeon Sik
• Choi Gi Dae
• Yun Chang Hun

Classifications

• C08K2201/003

  Additives being defined by their diameter · CPC title

• C08K2201/011

  Nanostructured additives · CPC title

• H01Q1/526

  Electromagnetic shields · CPC title

• C08K7/24 Primary

  inorganic · CPC title

• H01Q1/42

  Housings not intimately mechanically associated with radiating elements, e.g. radome · CPC title