Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Reexamination Certificate
2001-04-06
2004-09-21
Thibodeau, Paul (Department: 1773)
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
C428S416000, C428S458000, C428S461000, C428S933000, C408S0010BD, C408S07200R, C408S087000
Reexamination Certificate
active
06794022
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a metal plate coated with a lubricating resin which is preferable as a patch board for protection in order to efficiently carry out in the small hole drilling process of a printed wiring board, and the drilling processing method of the printed wiring board.
2. Description of the Related Art
When through holes are formed by a drill on a laminated printed wiring board in which a metal foil such as copper or the like is laminated on an insulator, a method of carrying out drilling processing by a drill by arranging a water-soluble lubricating immersion sheet on one side or both sides of the above-described laminated substrate and using the sheet as a patch board is disclosed in U.S. Pat. No. 4,781,495 and U.S. Pat. No. 4,929,370. The lubricating immersion sheet used in the method of forming the through holes is obtained by immersing a mixture of glycols such as diethylene glycol, dipropylene glycol, and the like which is a solid water-soluble lubricant, synthetic waxes such as a fatty acid and the like and nonionic surfactants in a porous material such as paper.
On the other hand, a method of drilling by a drill by using a water-soluble matrix polymer of a polyethylene glycol and a polypropylene glycol or a fatty acid ester derivative thereof alone, or a mixture thereof, and arranging a sheet in which the above-described polymer layer is formed, is disclosed (Japanese Patent Application Laid-Open No.4-92488, No.4-92489, No.4-92490, No.4-92491, No.4-92492, No.4-92493, No.4-92494).
Furthermore, a method of using a polyvinyl pyrrolidone, a gum arabic, a poly(sodium acrylate), sodium alginate, a carboxymethyl cellulose derivative, a polyether ester, a polyethylenepolypropylene glycol tolylene diisocyanate copolymer, a mixture of a specified polyalkylene oxide, a specified dicarboxylic acid compound and a diisocyanate compound, and a resin obtained by reacting a copolymer derived from a specified vinyl compound with a dibasic oxygen acid which contains a polyoxyethylene group as another water-soluble matrix polymer, is disclosed (Japanese Patent Application Laid-Open No.5-169400, No.6-344297, No.8-197496, No.10-6298 and No.10-330777).
However, these methods had defects in that although there is surely an effect of prevention of heat caused by a drill and effects of the reduction of roughness of the inner wall of the drilled part of a printed wiring board and the improvement of drill life-time, the immersion in a porous sheet such as paper or the like is deficient, the adhesion property with an aluminum substrate is inferior, the coating film itself is further apt to be sticky, the stickiness of coating film surface occurs easily under high humidity conditions such as summer, and trouble in treatment as a product is generated. According to advanced studies by the inventors of the present application, the above-mentioned problems were considerably improved by addition of an inorganic powder filler, but the problem of the absorption of moisture or the stickiness by wetting was an essentially inevitable problem by the prior art in which the main component of coating film is composed of a water-soluble resin.
Additionally, there has been a strong requirement to reduce costs of a printed wiring board under the demand of lowering cost in recent electronic information instruments. Accordingly, there is a requirement to shorten the drilling processing time and increase the number of sheets produced per hour, and it has been necessary to increase the rotational speed of a drill bit, make the processing speed of drilling higher, increase the number of a printed wiring boards which are processed at the same time, and extend the life time of a drill, etc. For these demands, it is required to design to make the quality thereof high, as the patch board for a protective board which is used in a severe condition of drilling processing so as to improve the precision of drilling position and the smoothness of the inner surface of the hole.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a metal plate coated with a lubricating resin being suitable as a patch board for a protective board, wherein the effect of preventing heat generation at the drill bit in drilling, the lubrication effect and the effect of preventing scattering of chips are high, and simultaneously the discharge property of chips is excellent, the drilling processing can be efficiently carried out in high quality, and simultaneously stickiness is not found, in the drilling processing of a printed wiring board by a drill; and drilling processing method of the printed wiring board being used thereof.
The metal plate coated with a lubricating resin according to the first aspect of the present invention comprises: a lubricating resin coating film obtained by coating and curing by heat a resin composition containing a modified polyamide ({circle around (1)}) and a crosslinking curing agent ({circle around (2)}) of the modified polyamide ({circle around (1)}) on at least one side face of the metal plate.
In the metal plate coated with a lubricating resin, the compounding ratio of the above-described modified polyamide ({circle around (1)}) and the above-described crosslinking curing agent ({circle around (2)}) is preferably {circle around (1)}:{circle around (2)}=(60:40) to (85:15) by a mass ratio converted to solid content. In this case, “a mass ratio converted to solid content” means a ratio of mass of each constitutive unit without solvent.
Furthermore, the above-described resin composition preferably contains an inorganic powder filler ({circle around (3)}).
Furthermore, the above-described resin coating film preferably contains the resin composition which is composed of a water-soluble lubricant ({circle around (4)}) which is composed of an ethylene oxide unit or an ethylene oxide unit and a propylene oxide unit, and a polycarboxylic acid compound ({circle around (5)}).
Further, the above-described polycarboxylic acid compound ({circle around (5)}) is preferably a polymer compound containing a carboxyl group in a polymer chain, particularly a polyolefin-based resin containing a carboxyl group.
The above-described resin composition preferably contains at least one kind of modified olefin-based resin ({circle around (6)}).
The above-described resin composition is selected from a group comprising, for example, a hydrocarbon-based lubricant composed of a liquid paraffin, a paraffin wax, a micro wax, a low polymerization degree polyethylene, a chlorinated hydrocarbon or a fluorocarbon, a fatty acid-based lubricant composed of a higher fatty acid or an oxy fatty acid, a fatty acid amide-based lubricant composed of a fatty acid amide or an alkylene fatty acid amide, an ester-based lubricant composed of a lower alcohol ester of a fatty acid, a polyhydric alcohol ester of a fatty acid, a polyglycol ester of a fatty acid or a fatty alcohol ester of a fatty acid, an alcohol-based lubricant composed of fatty alcohols, a metal soap-based lubricant composed of an alkaline metal salt of a fatty acid having 12 to 18 carbon atoms, a natural wax-based lubricant composed of a carnauba wax, a candelilla wax, a bees wax, an ibota wax or a montan wax, and a mixture thereof, and contains at least one kind of lubricating compound ({circle around (7)}) having a melting point of a range of 50 to 150° C.
The metal plate coated with a lubricating resin according to the second invention of the present application comprises: a lubricating resin coating film obtained by coating the resin composition which is composed of a water-soluble lubricant ({circle around (4)}) which is composed of an ethylene oxide unit or an ethylene oxide unit and a propylene oxide unit, and a polycarboxylic acid compound ({circle around (5)}), on at least one side face of a metal plate.
In the metal plate coated with a lubricating resin, the above-described resin composition preferably contains an inorganic powder filler ({circle around (3)}).
Further, the above-described re
Fujiwara Naoya
Kawai Hiroshi
Okamura Yasuhiro
Ono Mikio
Yoshikawa Eiichiro
Kabushiki Kaisha Kobe Seiko Sho
Kruer Kevin R.
Thibodeau Paul
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