Patent ID: 6036901
Filing Date: 2000-03-14
Classification: B29C,B29K,H05K,Y10S

Abstract:
A process for producing an electronic part, comprising:a first molding step of injecting a melt-moldable, water-soluble resin, soluble in hot water, and which is based on a polyvinyl alcohol resin containing an oxyalkylene group, into a mold cavity corresponding to a complicated internal configuration of the electronic part, to produce a core to be used at a subsequent injection molding step;a second molding step of inserting said core into a mold cavity corresponding to an external configuration having a ridgy projection for a circuit pattern to be formed on the surface of said electronic part and injecting a metallization-grade aromatic polyester liquid crystalline polymer into said mold cavity by injection molding to produce a second stage product which has said core inserted therein, said circuit pattern forming area protruded as a ridge, and a discharge outlet;a dissolution step of immersing said second stage product in hot water under heating for dissolving away said core through said discharge outlet;a catalyst providing step of surface-roughening said third stage product after said dissolution step, and providing a catalyst;a third molding step of inserting said third stage product, after said catalyst providing step, into a mold cavity corresponding to the external configuration of said electronic part and injecting a nonmetallization-grade liquid crystalline polymer into said mold cavity by injection molding for coating the surface, excluding the circuit pattern forming area, so as to produce a fourth stage product; andan electroconductive circuit forming step of metallizing said circuit pattern forming area exposed at the external peripheral surface of said fourth stage product.