ELECTROMAGNETIC WAVE SHIELDING SHEET AND METHOD FOR MANUFACTURING SAME

• US 20170112026A1
• Filed: 02/26/2015
• Published: 04/20/2017
• Est. Priority Date: 03/25/2014
• Status: Abandoned Application

• Current Assignee: LG Hausys Limited
• Original Assignee: LG Hausys Limited
• Inventors: NAM, Hae-Rim, KIM, Yu-Jun, YU, Da-Young, PARK, Hwan-Seok, YUE, Seong-Hoon, KWON, Hea-Won, SONG, Yea-Ri
• Application Number:
  US15/128,428
• Publication Number:
  US 20170112026A1
• Time in Patent Office: Days
• CPC Class Codes: B29C 43/203 Making multilayered articles
• CPC Class Codes: B29K 2105/16 Fillers
• CPC Class Codes: B29K 2509/00 Use of inorganic materials not provided for in groups B29K2503/00 - B29K2507/00, as filler
• CPC Class Codes: B29K 2995/0008 Magnetic or paramagnetic
• CPC Class Codes: C09K 5/14 Solid materials, e.g. powdery or granular
• CPC Class Codes: H05K 9/0075 Magnetic shielding materials
• CPC Class Codes: H05K 9/0081 Electromagnetic shielding materials, e.g. EMI, RFI shielding H05K9/0003 takes precedence
• CPC Class Codes: H05K 9/0084 comprising a single continuous metallic layer on an electrically insulating supporting structure, e.g. metal foil, film, plating coating, electro-deposition, vapour-deposition
• CPC Class Codes: H05K 9/0086 comprising a single discontinuous metallic layer on an electrically insulating supporting structure, e.g. metal grid, perforated metal foil, film, aggregated flakes, sintering
• CPC Class Codes: H05K 9/0088 comprising a plurality of shielding layers; combining different shielding material structure
• CPC Class Codes: H05K 9/009 comprising electro-conductive fibres, e.g. metal fibres, carbon fibres, metallised textile fibres, electro-conductive mesh, woven, non-woven mat, fleece, cross-linked

Abstract

Provided are an electromagnetic wave shielding sheet and a method for producing the same, the electromagnetic wave shielding sheet comprising a unit structure, which comprises a heat-radiating layer and a magnetic layer, and comprising a stack structure in which a plurality of the unit structures is stacked, wherein the sum of total thickness of the heat-radiating layers has a ratio of 0.1 to 0.7 with regard to the total thickness of the electromagnetic wave shielding sheet.

Claims

1. An electromagnetic wave shielding sheet comprising:

a stack structure of a plurality of unit structures, each of the unit structures comprising a heat-radiating layer and a magnetic layer,

wherein the sum of total thickness of the heat-radiating layers has a ratio of 0.1 to 0.7 with regard to the total thickness of the electromagnetic wave shielding sheet.

2. The electromagnetic wave shielding sheet of claim 1, wherein the stack structure includes the magnetic layer as a top layer or a bottom layer.

3. The electromagnetic wave shielding sheet of claim 1, wherein the total thickness of the electromagnetic wave shielding sheet is 200 μ

m to 500 μ

m.

4. The electromagnetic wave shielding sheet of claim 1, wherein the heat-radiating layer includes inorganic particles and an organic binder.

5. The electromagnetic wave shielding sheet of claim 4, wherein the heat-radiating layer includes 80 wt % to 99 wt % of the inorganic particles and 1 wt % to 20 wt % of the organic binder.

6. The electromagnetic wave shielding sheet of claim 4, wherein the inorganic particle includes at least one selected from the group consisting of graphite, graphene, carbon nanotube (CNT), boron nitride (BN), aluminum nitride (AlN), and combinations thereof.

7. The electromagnetic wave shielding sheet of claim 4, wherein the organic binder includes at least one selected from the group consisting of a styrene-butadiene rubber (SBR), a styrene-ethylene-butylene-styrene copolymer (SEBS), an ethylene-vinyl acetate copolymer (EVA), low density polyethylene (LDPE), an acrylic resin, an ester-based resin, an epoxy resin, and combinations thereof.

8. The electromagnetic wave shielding sheet of claim 1, wherein the magnetic layer and the heat-radiating layer include the same organic binder.

9. A method for producing an electromagnetic wave shielding sheet comprising:

preparing a magnetic layer;

forming a unit structure by stacking a heat-radiating layer on one surface of the magnetic layer;

forming a stack structure in which the magnetic layers and the heat-radiating layers are alternately stacked with each other by stacking the at least two unit structures; and

forming the electromagnetic wave shielding sheet by thermocompressing the stack structure,

wherein the sum of total thickness of the heat-radiating layers has a ratio of 0.1 to 0.7 with regard to the total thickness of the electromagnetic wave shielding sheet.

10. The method of claim 9, wherein the forming of the unit structure includes:

preparing a coating liquid by mixing an organic solvent with a solid containing inorganic particles and an organic binder and

stacking the heat-radiating layer by coating the coating liquid on one surface of the magnetic layer.

11. The method of claim 9, wherein the forming of the stack structure includes forming the magnetic layer as a top layer or a bottom layer of the stack structure.