Entry sheet for drilling and method for drilling processing using same

Patent metadata

Field	Value
Publication number	US-10486324-B2
Application number	US-201615553795-A
Country	US
Kind code	B2
Filing date	Feb 24, 2016
Priority date	Mar 19, 2015
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

Entry sheet for drilling including a metallic foil and a layer of a resin composition, the layer formed on the metallic foil without interposing an adhesion layer, in which the layer of the resin composition has a peak attributable to a carbon atom-oxygen atom double bond appearing at 1700 to 1750 cm −1 and a peak attributable to a carbon atom-oxygen atom single bond appearing at 1080 to 1300 cm −1 in infrared spectroscopy, and when the absorbance at the peak attributable to the carbon atom-oxygen atom double bond appearing at 1700 to 1750 cm −1 is represented by Abs(C═O)L, and the absorbance at the peak of the carbon atom-oxygen atom single bond appearing at 1080 to 1300 cm −1 is represented by Abs(C—O)L, the layer of the resin composition has an absorbance ratio (C) of 0.12 to 1.80, the absorbance ratio (C) represented by the following expression (1).

Absorbance ratio(C)=Abs(C═O)L/Abs(C—O)L   Expression (1).

First claim

The invention claimed is:

1. 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 layer of the resin composition has a peak attributable to a carbon atom-oxygen atom double bond appearing at 1700 to 1750 cm −1 and a peak attributable to a carbon atom-oxygen atom single bond appearing at 1080 to 1300 cm −1 in an infrared spectroscopy, and
when an absorbance at the peak attributable to the carbon atom-oxygen atom double bond appearing at 1700 to 1750 cm −1 is represented by Abs(C═O)L, and an absorbance at the peak of the carbon atom-oxygen atom single bond appearing at 1080 to 1300 cm −1 is represented by Abs(C—O)L, the layer of the resin composition has an absorbance ratio (C) of 0.12 to 1.80, the absorbance ratio (C) represented by expression (1):
Absorbance ratio(C)=Abs(C═O)L/Abs(C—O)L   Expression (1).

2. The entry sheet for drilling according to claim 1 , wherein the resin composition comprises:
a water-insoluble resin (A) having the peak attributable to the carbon atom-oxygen atom double bond appearing at 1700 to 1750 cm −1 in the infrared spectroscopy; and
a water-soluble resin (B) having the peak attributable to the carbon atom-oxygen atom single bond appearing at 1080 to 1300 cm −1 in the infrared spectroscopy.

3. The entry sheet for drilling according to claim 2 , wherein the water-insoluble resin (A) is one or more selected from the group consisting of polyurethane resins, polyester resins, acrylic-based resins, and polyolefin-based resins.

4. The entry sheet for drilling according to claim 2 , wherein the water-soluble resin (B) is one or more selected from the group consisting of polyethylene oxide; polypropylene oxide; cellulose derivatives; polytetramethylene glycol; polyethylene glycol; polypropylene glycol; monoether compounds of polyoxyethylene; polyoxyethylene monostearate; polyoxyethylene sorbitan monostearate; polyglycerin monostearate compounds; and a polyoxyethylene-propylene copolymer.

5. The entry sheet for drilling according to claim 4 , wherein
the water-soluble resin (B) comprises:
a high-molecular-weight water-soluble resin (b1) having a weight average molecular weight of 50,000 or higher and 1,000,000 or lower; and
a low-molecular-weight water-soluble resin (b2) having a weight average molecular weight of 1,000 or higher and 30,000 or lower, and
the high-molecular-weight water-soluble resin (b1) comprises at least one selected from the group consisting of polyethylene oxide, polypropylene oxide, and cellulose derivatives, and
the low-molecular-weight water-soluble resin (b2) comprises at least one selected from the group consisting of polytetramethylene glycol; polyethylene glycol; polypropylene glycol; monoether compounds of polyoxyethylene; polyoxyethylene monostearate; polyoxyethylene sorbitan monostearate; polyglycerin monostearate compounds; and a polyoxyethylene-propylene copolymer.

6. The entry sheet for drilling according to claim 2 , wherein the resin composition comprises:
20 to 80 parts by mass of the water-insoluble resin (A); and
80 to 20 parts by mass of the water-soluble resin (B) each based on 100 parts by mass of a total amount of the water-insoluble resin (A) and the water-soluble resin (B).

7. The entry sheet for drilling according to claim 2 , wherein the layer of the resin composition is formed using: an aqueous dispersion of the water-insoluble resin (A); and the water-soluble resin (B).

8. The entry sheet for drilling according to claim 1 , wherein the layer of the resin composition has a thickness of 0.02 to 0.3 mm.

9. The entry sheet for drilling according to claim 1 , wherein the metallic foil has a thickness of 0.05 to 0.5 mm.

10. A method for drilling processing, the method comprising a hole formation step of forming a hole in a laminated board or a multi-layer board using the entry sheet for drilling according to claim 1 .

Assignees

• Mitsubishi Gas Chemical Co

Inventors

• Kamei Takayuki
• Matsuyama Yousuke
• Ogashiwa Takaaki

Classifications

• H05K2203/0214

  Back-up or entry material, e.g. for mechanical drilling · CPC title

• B23B35/00

  Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods · CPC title

• B23B2250/12

  Cooling and lubrication · CPC title

• H05K3/0047 Primary

  Drilling of holes · CPC title

• H05K3/007

  Manufacture or processing of a substrate for a printed circuit board supported by a temporary or sacrificial carrier (H05K1/187, H05K3/20 and H05K3/4682 take precedence) · CPC title