Electromagnetic shielding material
An electromagnetic wave shielding material includes a metal layer for ground connection provided as an outermost layer of a laminate; wherein only one surface of the metal layer for ground connection is laminated on the insulating layer via the adhesive layer, and assuming d 1 is a thickness and ε 1 is a Young's modulus of the adhesive layer on the one surface, d 2 is a thickness and ε 2 is a Young's modulus of the metal layer for ground connection, and ε 3 is a composite Young's modulus of the adhesive layer on the one surface and the metal layer for ground connection, the following relational expression is satisfied: ε 3 /ε 2 >0.60; in which, ε 3 =ε 1 (d 1 /(d 1 +d 2 ))+ε 2 (d 2 (d 1 +d 2 )).
1. An electromagnetic wave shielding material, composed of a laminate in which N metal layer(s) for shield (where N is an integer equal to or greater than 1) and N+1 insulating layers are alternately laminated via adhesive layers, the electromagnetic wave shielding material further comprising a metal layer for ground connection provided as an outermost layer of the laminate;
wherein only one surface of the metal layer for ground connection is laminated on the insulating layer via the adhesive layer, and assuming d 1 is a thickness and ε 1 is a Young's modulus of the adhesive layer on the one surface, d 2 is a thickness and ε 2 is a Young's modulus of the metal layer for ground connection, and ε 3 is a composite Young's modulus of the adhesive layer on the one surface and the metal layer for ground connection, the following relational expression is satisfied:
ε 3 /ε 2 >0.60
in which, ε 3 =ε 1 (d 1 /(d 1 +d 2 ))+ε 2 (d 2 /(d 1 +d 2 )).
2. The electromagnetic wave shielding material according to claim 1 , wherein the following relational expression is satisfied: ε 3 /ε 2 ≥0.70.
3. The electromagnetic wave shielding material according to claim 1 , wherein the following relational expression is satisfied: ε 3 /ε 2 ≥0.80.
4. The electromagnetic wave shielding material according to claim 1 , wherein the composite Young's modulus ε 3 is 25000 to 45000 MPa.
5. The electromagnetic wave shielding material according to claim 1 , wherein each metal layer has a thickness of 4 to 100 μm.
6. The electromagnetic wave shielding material according to claim 1 , wherein each insulating layer has a thickness of 4 to 600 μm.
7. The electromagnetic wave shielding material according to claim 1 , wherein a total thickness of the metal layer for shield and the metal layer for ground connection is 15 to 150 μm.
8. A coating material or exterior material for electric/electronic device, comprising the electromagnetic wave shielding material according to claim 1 .
9. An electric/electronic device comprising the coating material or exterior material according to claim 8 .