Lubricant sheet for drilling and method of drilling

Inactive Publication Date: 2005-01-06
MITSUBISHI GAS CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0032] According to the lubricant sheet for drilling, provided by the present invention, the lubricant sheet can be disposed without any mistake of distinguishment of both surfaces from each other. In regard to the lubricant sheet using a water-soluble resin, even when the resin adheres to a hole wall, the resin can be easily removed by washing with water in a subsequent step. An entry sheet having industrially high practicality can be obtained.
[0033] According to the colored lubricant sheet for drilling, provided by the present invention, the distinguishment between both surface

Problems solved by technology

When such a small-diameter hole is made using an aluminum entry sheet alone, there are problems that the life of a drill is short, that the roughness of a hole wall is large and that hole-location accuracy is poor.
For this reason, when the thickness of the lubricant resin layer is small, it is difficult to distinguish both surfaces of the lubricant sheet from each other so that it is di

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example

Example 1

[0036] 1 part of a blue water-soluble dye (edible coloring matter blue No.1), which did not contain a halogen, was added to 35 parts of a polyethylene oxide having a molecular weight of 500,000 and 65 parts of a polyglycerin monostearate having a molecular weight of 900. These were kneaded with a kneader at 130° C. under a nitrogen gas seal for 1 hour, to obtain a mixture having a viscosity of 160,000 poise. The mixture was passed through a heating roll at 130° C. to obtain a blue-colored sheet having a thickness of 0.05 mm.

[0037] Separately, 10 parts of a saturated polyester resin having a hydroxyl group at a terminal and having a molecular weight of 20,000 and a melt-viscosity of 800 poise (at 200° C.) and 3 parts of hexamethylene diisocyanate were dissolved in a mixed solvent of toluene / methyl ethyl ketone=3 / 1, to obtain a solution having a concentration of 10% by weight. The solution was applied to one surface of a hard aluminum foil having a thickness of 100 μm and t...

Example

Example 2

[0038] 10 parts of polyethylene glycol as a lubricant was added to 200 parts of a polyvinylacetal resin, 400 parts of an epoxy resin and 400 parts of a phenol resin, and 2 parts of edible coloring matter Yellow No.5 as a colorant was added to the mixture to obtain a thermosetting resin composition. The thermosetting resin composition was bonded to one surface of a hard aluminum foil (surface roughness average 1.6 μm, Max. 2.7 μm) having a thickness of 100 μm, to obtain a lubricant sheet for drilling which had a resin composition layer having a thickness of 100 μm (both surfaces of the lubricant sheet were apparently distinguishable from each other). Then, two 1.6 mm-thick glass epoxy copper-clad six-layered boards were stacked. The above lubricant sheet was disposed on the top surface of the stacked boards such that the resin composition layer of the lubricant sheet faced upward, and a 1.5 mm-thick paper-base-material phenol resin laminate was disposed on the lower surface...

Example

Comparative Examples 1 and 2

[0039] Lubricant sheets for drilling were prepared in the same manner as in Examples 1 and 2 except that the colorants used in Examples 1 and 2 were not used. Each of the lubricant sheets was respectively disposed on the top surface of two stacked copper-clad six-layered boards such that the aluminum foil side of the lubricant sheet faced upward. Holes were made in the same conditions as those in Examples 1 and 2. Table 1 shows evaluation results.

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Abstract

A lubricant sheet suitable for use in a process of drilling a laminate or a plastic board, comprising a metal foil or an organic film, and a lubricant resin composition layer or a primer layer and the lubricant resin composition layer, the lubricant resin composition layer or the primer layer and the lubricant resin composition layer being formed on at least one surface of the metal foil or the organic film, wherein at least one layer of the primer layer and the lubricant resin composition layer contains a colorant, and a drilling method using the above lubricant sheet.

Description

[0001] This is a continuation-in-part of Ser. No. 10 / 765,041, filed Jan. 28, 2004.FIELD OF THE INVENTION [0002] The present invention relates to a lubricant sheet for drilling which, when a hole is made in a laminate or a plastic board, is disposed on a surface of the laminate or the plastic board, and a drilling method using the above lubricant sheet for drilling. A penetration hole obtained by using the above lubricant sheet for drilling in the production of a printed wiring board is suitably used mainly as a through hole of a printed wiring board such as a semiconductor plastic package or a mother board. Further, the lubricant sheet for drilling, provided by the present invention, can be applied to other precise drilling applications, e.g., application of drilling a hard plastic board such as a spectacle lens. PRIOR ARTS OF THE INVENTION [0003] Conventionally, an aluminum sheet is used as an entry sheet for drilling a laminate, used for a printed wiring board, with a metal drill....

Claims

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Application Information

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IPC IPC(8): B23B35/00B32B15/08B32B27/14H05K3/00
CPCB23B35/00B23B2250/12B32B15/08H05K3/0047H05K2203/0214Y10T428/24917H05K2203/161Y10T29/49124Y10T408/03Y10T428/24802Y10T428/24826H05K2203/127B32B27/08B32B27/20B32B38/18B32B2307/7166Y10T428/31504Y10T428/31678
Inventor IKEGUCHI, NOBUYUKIHASAKI, TAKUYAKOMATSU, SHINYAKOBAYASHI, TOSHIHIKOEJIRI, MITSUO
Owner MITSUBISHI GAS CHEM CO INC
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