Stretchable member with metal foil

1. A stretchable member with a metal foil, comprising:

a stretchable resin base material; and

a conductive metal foil provided on the stretchable resin base material,

wherein a surface of the metal foil on the stretchable resin base material side is a roughened surface having surface roughness Ra of 0.1 μm to 3 μm, and

a recovery rate after the stretchable resin base material is subjected to tensile deformation up to strain of 20% is greater than or equal to 80%.

2. The stretchable member with a metal foil according to claim 1 ,

wherein the metal foil is a copper foil.

3. The stretchable member with a metal foil according to claim 1 ,

wherein the stretchable resin base material contains (A) a rubber component, and

the rubber component includes at least one kind selected from the group consisting of acrylic rubber, isoprene rubber, butyl rubber, styrene butadiene rubber, butadiene rubber, acrylonitrile butadiene rubber, silicone rubber, urethane rubber, chloroprene rubber, ethylene propylene rubber, fluorine rubber, sulfurized rubber, epichlorohydrin rubber, and chlorinated butyl rubber.

4. The stretchable member with a metal foil according to claim 3 ,

wherein a content of the rubber component is 30 mass % to 100 mass % with respect to a mass of the stretchable resin base material.

5. The stretchable member with a metal foil according to claim 3 ,

wherein the stretchable resin base material further contains a cross-linking polymer of (B) a cross-linking component.

6. The stretchable member with a metal foil according to claim 5 ,

wherein the cross-linking component is a compound having a reactive group of at least one kind selected from the group consisting of a (meth)acryl group, a vinyl group, an epoxy group, a styryl group, an amino group, an isocyanurate group, an ureide group, a cyanate group, an isocyanate group, and a mercapto group.

7. A stretchable device comprising:

a wiring substrate formed by forming the metal foil of the stretchable member with a metal foil according to claim 1 into a wiring pattern; and

an electronic element mounted on the wiring substrate.

8. A method of manufacturing a wiring substrate including a stretchable resin base material, and a metal foil being formed into a wiring pattern, the method comprising:

forming an etching resist on the metal foil of the stretchable member with a metal foil according to claim 1 ;

exposing the etching resist, developing the etching resist after exposure, and thereby forming a resist pattern covering a part of the metal foil;

removing the metal foil in a portion that is not covered with the resist pattern, and thereby forming the metal foil into the wiring pattern; and

removing the resist pattern.