Entry sheet for drilling
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsYousuke Matsuyama, Takaaki Ogashiwa
Life of this patent
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Abstract
The present invention provides an entry sheet for drilling which provides higher hole position accuracy than that of a conventional entry sheet for drilling. The present invention provides an entry sheet for drilling, including a metal foil, and a layer including a resin composition and formed on at least one surface of the metal foil, wherein the resin composition includes a resin and tungsten disulfide as a solid lubricant, and the content of the tungsten disulfide included in the resin composition is 10 parts by mass to 200 parts by mass based on 100 parts by mass of the resin included in the resin composition.
Claims18
An entry sheet for drilling, comprising a metal foil, and a layer comprising a resin composition and formed on at least one surface of the metal foil, wherein
- the resin composition comprises a resin, tungsten disulfide as a solid lubricant, and a water-soluble resin (A), and
- the content of the tungsten disulfide included in the resin composition is 10 parts by mass to 200 parts by mass based on 100 parts by mass of the resin included in the resin composition,
- wherein the water-soluble resin (A) includes one or more selected from the group consisting of polyethylene oxide, polypropylene oxide, polyethylene glycol, and polypropylene glycol.
A laminate structure comprising:
- a substrate having an upper surface, the substrate including at least one of a laminate and a multilayer board for a printed wiring board;
- and
- an entry sheet for drilling positioned on the upper surface of the substrate, the entry sheet including a metal foil and a layer comprising a resin composition formed on at least one surface of the metal foil,
- wherein the resin composition includes a resin, tungsten disulfide as a solid lubricant, and a water-soluble resin (A), wherein the content of the tungsten disulfide included in the resin composition is 10 parts by mass to 200 parts by mass based on 100 parts by mass of the resin included in the resin composition, and the water-soluble resin (A) includes one or more selected from the group consisting of polyethylene oxide, polypropylene oxide, polyethylene glycol, and polypropylene glycol.
Dependencies are inferred from the claim text.