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US 10,478,991 B2Granted
Entry sheet for drilling and method for drilling processing using same
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsTakayuki Kamei, Yousuke Matsuyama, Takaaki Ogashiwa
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Abstract
An entry sheet for drilling comprising: a metallic foil; and a layer of a resin composition, the layer formed on the metallic foil without interposing an adhesion layer, wherein the surface of the layer of the resin composition, the surface being in contact with the metallic foil, has a dispersion term γSD of surface free energy in a range from 27.0 to 37.0 mJ/m2 and a polar term γSP of the surface free energy in a range from 0 to 5.0 mJ/m2.
Claims11
An entry sheet for drilling comprising:
- a metallic foil;
- and
- a layer of a resin composition, the layer formed on the metallic foil without interposing an adhesion layer, wherein
- a surface of the layer of the resin composition, the surface being in contact with the metallic foil, has a dispersion term γSD of a surface free energy in a range from 27.0 to 37.0 mJ/m2 and a polar term γSP of the surface free energy in a range from 0 to 5.0 mJ/m2.
1 more element
Dependencies are inferred from the claim text.