WO2014098064A1 - 導電性皮膜形成浴 - Google Patents
導電性皮膜形成浴 Download PDFInfo
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- WO2014098064A1 WO2014098064A1 PCT/JP2013/083713 JP2013083713W WO2014098064A1 WO 2014098064 A1 WO2014098064 A1 WO 2014098064A1 JP 2013083713 W JP2013083713 W JP 2013083713W WO 2014098064 A1 WO2014098064 A1 WO 2014098064A1
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- conductive film
- bath
- plating
- film forming
- copper
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/24—Electrically-conducting paints
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/31—Coating with metals
- C23C18/38—Coating with copper
- C23C18/40—Coating with copper using reducing agents
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/54—Electroplating of non-metallic surfaces
- C25D5/56—Electroplating of non-metallic surfaces of plastics
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/1601—Process or apparatus
- C23C18/1633—Process of electroless plating
- C23C18/1646—Characteristics of the product obtained
- C23C18/165—Multilayered product
- C23C18/1653—Two or more layers with at least one layer obtained by electroless plating and one layer obtained by electroplating
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/18—Pretreatment of the material to be coated
- C23C18/20—Pretreatment of the material to be coated of organic surfaces, e.g. resins
- C23C18/2006—Pretreatment of the material to be coated of organic surfaces, e.g. resins by other methods than those of C23C18/22 - C23C18/30
- C23C18/2046—Pretreatment of the material to be coated of organic surfaces, e.g. resins by other methods than those of C23C18/22 - C23C18/30 by chemical pretreatment
- C23C18/2073—Multistep pretreatment
- C23C18/2086—Multistep pretreatment with use of organic or inorganic compounds other than metals, first
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/18—Pretreatment of the material to be coated
- C23C18/20—Pretreatment of the material to be coated of organic surfaces, e.g. resins
- C23C18/22—Roughening, e.g. by etching
- C23C18/24—Roughening, e.g. by etching using acid aqueous solutions
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/18—Pretreatment of the material to be coated
- C23C18/20—Pretreatment of the material to be coated of organic surfaces, e.g. resins
- C23C18/28—Sensitising or activating
- C23C18/285—Sensitising or activating with tin based compound or composition
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/18—Pretreatment of the material to be coated
- C23C18/20—Pretreatment of the material to be coated of organic surfaces, e.g. resins
- C23C18/28—Sensitising or activating
- C23C18/30—Activating or accelerating or sensitising with palladium or other noble metal
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/38—Electroplating: Baths therefor from solutions of copper
Definitions
- the present invention relates to a conductive film forming bath, a method for forming the conductive film, and a method for electroplating a non-conductive plastic molded article.
- an electroless copper plating solution containing a reducing agent having a strong reducing power such as paraformaldehyde is often used as the electroless plating solution.
- a reducing agent having a strong reducing power such as paraformaldehyde
- copper is deposited on palladium having strong catalytic ability in the colloidal tin / palladium film deposited as a catalyst at the initial stage of plating.
- reduction and precipitation of copper is continuously caused by the action of a reducing agent having a strong reducing power, and a copper film grows not only in a portion where palladium is adhered but also in a lateral direction.
- so-called bridge deposition occurs in which a film is deposited on tin that does not originally have catalytic ability, and a sponge-like film is easily formed.
- an electroless copper plating solution containing a saccharide having a relatively low reducing power as a reducing agent is used to form a bridge.
- Patent Document 1 a method of forming a decorative plating film excellent in appearance by forming a film having good conductivity without causing precipitation and directly performing electroplating on the film.
- the present invention has been made in view of the above-mentioned problems of the prior art, and its main purpose is to form a uniform electroplated coating film having excellent appearance on a non-conductive plastic molded article. It is an object of the present invention to provide a composition for forming a conductive film having excellent performance as a base for electroplating, which can be effectively used for the above.
- the present inventor has intensively studied to achieve the above-mentioned purpose.
- a non-conductive plastic molded article is immersed in the aqueous solution. It has been found that a uniform film without bridge deposition can be formed on the surface of a non-conductive plastic molded article by a simple method.
- membrane formed in this way is a film
- the present invention provides the following conductive film forming bath, a method for forming the conductive film, and a method for electroplating a non-conductive plastic molded article.
- a copper compound (B) complexing agent, (C) alkali metal hydroxide, (D) an aliphatic polyalcohol compound having 2 to 5 carbon atoms and a reducing compound having (E) group: —COOM (wherein M represents H, an alkali metal, or a group: —NH 4 ).
- a conductive film forming bath comprising an aqueous solution containing at least one compound selected from the group consisting of saccharides having a reducing property of 6 or more carbon atoms.
- both a reducing compound having a group: —COOM (wherein M represents H, an alkali metal or a group: —NH 4 ) and a reducing saccharide having 6 or more carbon atoms are included.
- Item 2. A conductive film forming bath according to Item 1. 3.
- Item 3. A method for forming a conductive film on a non-conductive plastic molded article, wherein the conductive film-forming bath according to Item 1 or 2 is contacted with a non-conductive plastic molded article to which a catalytic substance is added. 4).
- the method for forming a conductive film according to Item 3 wherein a non-conductive plastic molded article is brought into contact with the conductive film forming bath in a state where dissolved oxygen in the conductive film forming bath is increased. 5.
- Item 5. The method for forming a conductive film according to Item 4, wherein the means for increasing the dissolved oxygen is a method of supplying an oxygen-containing gas by bubbling or a method of adding an oxidizing agent. 6).
- Item 6. A method for electroplating a non-conductive plastic molded article, comprising the step of electroplating after forming a conductive film using a conductive film forming bath by the method according to any one of Items 3 to 5.
- the conductive film forming bath of the present invention comprises an aqueous solution containing the following components (A) to (E).
- A a copper compound,
- B complexing agent,
- C alkali metal hydroxide,
- D an aliphatic polyalcohol compound having 2 to 5 carbon atoms and a reducing compound having (E) group: —COOM (wherein M represents H, an alkali metal, or a group: —NH 4 ).
- M represents H, an alkali metal, or a group: —NH 4
- the “reducing compound having a group: —COOM (wherein M represents H, an alkali metal, or a group: —NH 4 )” may be referred to as a “carboxyl group-containing reducing compound”.
- Conductive film forming bath (A) Copper compound It is necessary to mix
- blend what is necessary is just a water-soluble copper compound, for example, copper sulfate, copper chloride, copper carbonate, copper hydroxide etc. can be used.
- the content of the copper compound is preferably about 0.1 to 5 g / l, more preferably about 0.8 to 1.2 g / l as the amount of copper metal.
- (B) Complexing agent It is necessary to add a complexing agent to the conductive film forming bath of the present invention.
- a complexing agent known complexing agents effective for copper ions can be used.
- hydantoins and organic carboxylic acids can be used.
- Complexing agents can be used alone or in combination of two or more.
- the compounding amount of the complexing agent is preferably about 2 to 50 g / l, more preferably about 10 to 40 g / l.
- the amount of the complexing agent is too small, the complexing power is insufficient and the copper dissolving power is insufficient, which is not preferable.
- the conductive film forming bath of the present invention must contain an alkali metal hydroxide.
- an alkali metal hydroxide As the alkali metal hydroxide to be blended, sodium hydroxide, potassium hydroxide, lithium hydroxide and the like are suitable from the viewpoint of easy availability and cost.
- Alkali metal hydroxides can be used alone or in combination.
- the blending amount of the alkali metal hydroxide is preferably about 10 to 80 g / l, more preferably about 30 to 70 g / l.
- the pH of the plating bath is preferably in the range of 10.0 to 14.0 within the range of the blending ratio of each component described above, and preferably 11.5 to 13.5.
- the range is more preferable, and combinations of components used, specific blending ratios, and the like can be appropriately adjusted.
- the number of hydroxy groups contained in the aliphatic polyalcohol having 2 to 5 carbon atoms may be 2 or more, preferably 2 to 4, more preferably 2 or 3, and particularly preferably 2.
- aliphatic polyalcohol having 2 to 5 carbon atoms include ethylene glycol, 1,2-propanediol, 1,2-butanediol, 1,2-pentanediol, glycerin, erythritol, xylitol, 1,2, Examples include 4-butanetriol, diethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 2,2-dimethyl-1,3-propanediol, and the like.
- the blending amount of the aliphatic polyalcohol compound is preferably about 1 to 500 g / l, and more preferably about 1 to 200 g / l).
- the conductive film forming bath of the present invention it is particularly preferable to use an aliphatic polyalcohol having 2 or less carbon atoms between two hydroxy groups as the aliphatic polyalcohol having 2 to 5 carbon atoms.
- the blending amount is about 1 to 50 g / l, and a film having excellent conductivity can be formed.
- the blending amount of the aliphatic polyalcohol compound should be about 50 g / l or more within the above blending amount range. Is preferred.
- (E) Reducing agent in the conductive film forming bath of the present invention, at least one compound selected from the group consisting of a carboxyl group-containing reducing compound and a saccharide exhibiting reducing properties having 6 or more carbon atoms. Must be used. By using such a specific reducing agent, a uniform conductive film without bridge precipitation can be formed.
- Carboxyl group-containing reducing compound The carboxyl group-containing reducing compound to be blended in the conductive film forming bath of the present invention includes a group: —COOM (wherein M represents H, an alkali metal, or a group: —NH 4 .
- M represents H, an alkali metal, or a group: —NH 4 .
- the compound is not particularly limited as long as it is a compound having a reducing property, and known compounds can be used.
- Examples of the carboxyl group-containing reducing compound to be blended include a reducing carboxylic acid, a reducing dicarboxylic acid, and salts thereof.
- Examples of the salt include an alkali metal salt, a salt having a group: —NH 4 (ammonium salt), and the like.
- Examples of the alkali metal include lithium, sodium, and potassium.
- the carboxyl group-containing reducing compounds can be used alone or in combination.
- Saccharides having 6 or more carbon atoms and reducing properties The saccharides having 6 or more carbon atoms to be blended in the conductive film forming bath of the present invention may be saccharides having 6 or more carbon atoms and exhibiting reducing properties.
- saccharides having 6 or more carbon atoms and exhibiting reducing properties There are no particular limitations, and examples include known saccharides. For example, monosaccharides, disaccharides, oligosaccharides, polysaccharides, sugar alcohols, sugar acids, amino sugars, deoxy sugars, and lactones can be used.
- the number of carbons in a saccharide having a reducibility of 6 or more carbon atoms is preferably 6 or more, more preferably 6 to 12.
- Saccharides having 6 or more carbon atoms that exhibit reducing properties can be used singly or in combination.
- the total amount of the reducing agent is 0.1.
- about 100 to 100 g / l is preferable, and about 0.5 to 50 g / l is more preferable.
- the amount of the reducing agent is too small, the formation of the conductive film is insufficient, and the electroplating in the next step is not preferable because the deposition of the low current density region is deteriorated.
- the above-mentioned “carboxyl group-containing reducing compound” and / or “saccharides having a reducing ability of 6 or more carbon atoms” exhibiting a relatively weak reducing power are used as a reducing agent.
- Hydantoins or organic carboxylic acids having a relatively weak complexing power can be used as the complexing agent without reducing the stability of the conductive film forming bath.
- the conductive film-forming bath of the present invention containing such a relatively weak reducing agent and the above complexing agent has good precipitation properties and facilitates waste water treatment.
- the conductive film forming bath of the present invention it is preferable to use the above-described carboxyl group-containing reducing compound and a saccharide exhibiting reducing properties having 6 or more carbon atoms in combination as a reducing agent. By containing these components simultaneously, the conductivity of the film to be formed is dramatically improved.
- the conductive film forming bath of the present invention is a bath having excellent stability, and even when left at room temperature for 3 days, almost no precipitation occurs, and slight precipitation of copper may be observed. However, both are stable baths that do not interfere with normal use.
- a conductive film is formed on a non-conductive plastic molded article by bringing the non-conductive plastic molded article provided with a catalytic substance into contact with the conductive film forming bath of the present invention. be able to.
- the material of the plastic material is not particularly limited, and various conventionally known plastic materials can be processed.
- plastics widely used for chemical plating such as ABS resin, polyamide (nylon PA), polyacetal (POM), polycarbonate (PC), modified polyphenylene ether (PPE) and poly General-purpose engineering plastics such as butylene terephthalate (PBT), polyphenylene sulfide (PPS), polyethersulfone (PES), polyetherimide (PEI), polyetheretherketone (PEEK), polyimide (PI) exceeding 200 ° C
- PBT butylene terephthalate
- PPS polyphenylene sulfide
- PES polyethersulfone
- PEI polyetherimide
- PEEK polyetheretherketone
- PI polyimide
- super engineering plastics such as liquid crystal polymer (LCP), polymer alloys such as polycarbonate / ABS, etc. can be treated.
- a plating grade plastic material such as ABS resin which is devised so as not to impair adhesion and plating appearance by pretreatment such as etching treatment is particularly preferably used.
- Pretreatment process In the method for forming a conductive film of the present invention, first, as a pretreatment, in order to remove organic substances such as fingerprints, fats and oils, dusts and the like due to electrostatic action, etc. Clean the surface.
- a known degreasing agent may be used as the treatment liquid.
- a degreasing treatment or the like may be performed according to a conventional method using an alkali type degreasing agent or the like.
- This step selectively dissolves the resin surface to produce an anchor effect, and this treatment can improve the adhesion and appearance of the conductive film.
- Etching may be performed according to a conventional method.
- a mixed solution of chromic acid and sulfuric acid may be used, and the object to be processed may be immersed in an appropriately heated solution.
- an appropriate etching method may be selected according to a conventional method for a resin filled with an inorganic material or glass fiber.
- the chromic acid remaining on the resin surface can be easily removed by performing a cleaning treatment using a solution containing a reducing agent such as dilute hydrochloric acid solution or sodium bisulfite.
- Catalyst application step Next, a catalyst is applied to the treated product obtained in the pretreatment step.
- the type of catalyst is not particularly limited, and various known catalysts known as ordinary electroless plating solution catalysts can be used.
- a known noble metal catalyst-providing composition containing at least one component selected from the group consisting of silver, palladium, gold, ruthenium, copper, nickel and platinum as a catalyst component may be used.
- catalyst application compositions and catalyst application methods are not particularly limited, and may be appropriately selected from known compositions and known catalyst application methods.
- a palladium catalyst when a palladium catalyst is applied, the object to be treated is immersed in a sensitizer solution (tin (II) chloride hydrochloric acid solution) and then immersed in an activator solution (palladium chloride in hydrochloric acid solution) (sensitizer).
- a sensitizer solution tin (II) chloride hydrochloric acid solution
- an activator solution palladium chloride in hydrochloric acid solution
- -Activator method A method of improving catalytic activity by immersing in an accelerator solution composed of an acidic solution such as sulfuric acid after soaking in a tin-palladium mixed colloidal solution to dissolve excess tin ions. (Catalyst-Accelerator method) can be applied as appropriate.
- an acidic mixed colloidal aqueous solution containing palladium chloride and stannous chloride which are generally used can be used.
- a mixed colloidal solution containing about 0.05 to 0.6 g / l of palladium chloride, about 1 to 50 g / l of stannous chloride, and about 100 to 400 ml / l of 35% hydrochloric acid can be used.
- the catalyst-accelerator method is usually performed by adding a catalyst with a tin-palladium mixed colloidal solution and then immersing the object to be processed in an accelerator solution made of an acidic solution such as sulfuric acid.
- an accelerator solution made of an acidic solution such as sulfuric acid.
- the treatment with the accelerator liquid can be omitted.
- the method for forming a conductive film of the present invention can reduce the number of production steps, leading to cost reduction and industrially advantageous.
- the conductive film forming baths of the present invention containing (E) a reducing agent as a reducing agent and a carboxyl group-containing reducing compound and a saccharide having a reducing property of 6 or more carbon atoms at the same time is used. It is possible to significantly reduce the amount of the noble metal catalyst added in the catalyst application step.
- the amount of palladium chloride added is reduced to about 0.05 to 0.15 g / l. Can do.
- the conditions for immersion in the tin-palladium mixed colloidal solution are not particularly limited.
- the temperature of the mixed colloidal solution is about 10 to 50 ° C., preferably about 20 to 40 ° C. What is necessary is just to immerse an object.
- immersion time what is necessary is just to set required immersion time suitably according to the kind etc. of the conductive film formation bath of this invention.
- the immersion time is in the range of about 2 to 10 minutes.
- the conductive film forming bath of the present invention is used, a large amount of expensive noble metal catalyst is not used, which leads to a reduction in production cost and is advantageous for industrialization.
- Conductive film forming step Next, a conductive film is formed on the non-conductive plastic molded article provided with a catalyst using the conductive film forming bath of the present invention.
- Examples of a method for forming a conductive film by bringing a non-conductive plastic molded article provided with a catalyst into contact with the conductive film forming bath of the present invention include, for example, a non-conductive type provided with a catalyst in a conductive film forming bath. According to the method of immersing the plastic molded product, the conductive film can be efficiently formed.
- the conductive film forming bath of the present invention is preferably about pH 10 to 14, more preferably about pH 11.5 to 13.5. If the pH is too low, the smooth progress of the reduction reaction is hindered, and the reducing agent may be decomposed, etc., so that the depositing property of the conductive film is lowered and the conductive film forming bath may be decomposed. Absent. On the other hand, if the pH is too high, the stability of the conductive film forming bath tends to decrease, which is not preferable.
- the temperature of the bath for forming the conductive film varies depending on the specific composition of the conductive film forming bath, etc., but is usually preferably about 30 ° C. or higher, and preferably about 30 to 60 ° C. More preferred is about 45 to 55 ° C.
- the liquid temperature of the conductive film forming bath is too low, the film deposition reaction becomes slow, and film non-deposition and poor appearance tend to occur.
- the liquid temperature of the conductive film forming bath is too high, evaporation of the conductive film forming bath becomes intense and it becomes difficult to maintain the plating solution composition within a predetermined range. Is not preferable because it is likely to occur.
- the time for contacting the conductive film forming bath is not particularly limited, and may be a time that allows the conductive film to be completely covered. It can set suitably according to the surface state of a conductive film. If the contact time is too short, the conductive film is insufficient to supply onto the surface of the object to be processed, and the conductive film cannot be formed completely.
- the immersion time is preferably about 1 to 10 minutes, and more preferably about 3 to 5 minutes.
- the conductive film is formed by the above-described method, it is preferable to bring a non-conductive plastic molded product into contact with the conductive film forming bath in a state where dissolved oxygen in the conductive film forming bath is increased.
- the conductive film can be formed thicker, and the conductivity of the conductive film can be further improved.
- the state in which dissolved oxygen is increased means that the oxygen-containing gas is supplied by bubbling into the conductive film forming bath, and the state after increasing dissolved oxygen, or by adding an oxidizing agent, In addition to the state after increasing the amount of oxygen, the state of increasing dissolved oxygen while continuously bubbling and supplying an oxygen-containing gas into the conductive film forming bath, or while continuously adding an oxidizing agent The state where dissolved oxygen is increased is also included.
- oxygen or air can be used as the oxygen-containing gas.
- Oxygen or air may contain a gas other than oxygen, such as nitrogen or a rare gas.
- the oxidizing agent is not particularly limited, and a known compound that can increase dissolved oxygen can be used.
- dissolved oxygen in the conductive film forming bath can be increased by adding sodium persulfate, aqueous hydrogen peroxide, or the like.
- the addition amount of the oxidizing agent is preferably about 0.1 to 5 g / l with respect to the conductive film forming bath.
- a conductive film can be formed on a non-conductive plastic molded article provided with a catalyst.
- a film mainly containing copper oxide is formed.
- an aqueous solution containing sulfuric acid is particularly preferable.
- a dense film containing metallic copper is formed by immersing it in an acidic aqueous solution containing sulfuric acid, but the subsequent process is an acidic solution containing sulfuric acid such as a copper sulfate plating solution.
- an acidic solution containing sulfuric acid such as a copper sulfate plating solution.
- the step of immersing in an acidic aqueous solution can be omitted.
- the dense film containing metallic copper improves the conductivity and acid resistance of the film, and the electroplating film having a uniform appearance can be formed without damaging the conductive film in the electroplating process.
- Electroplating step Next, the object to be treated obtained by the conductive film forming bath of the present invention is subjected to an electroplating treatment according to a conventional method.
- the type of electroplating bath is not particularly limited, and any conventionally known electroplating bath can be used. Moreover, the conditions for the plating treatment may be in accordance with a conventional method.
- the copper plating for example, a known copper sulfate plating bath can be used.
- a plating bath in which a known brightener is added to an aqueous solution containing about 100 to 250 g / l of copper sulfate, about 20 to 120 g / l of sulfuric acid, and about 20 to 70 ppm of chlorine ions can be used.
- the conditions for copper sulfate plating may be the same as usual.
- plating may be performed at a liquid temperature of about room temperature and a current density of about 3 A / dm 2 , and plating may be performed up to a predetermined film thickness.
- the conductive film obtained by the conductive film forming bath of the present invention has high acid resistance, the film can be formed even when immersed in a strongly acidic plating solution such as a copper sulfate plating solution in this electroplating step. It is possible to form a decorative plating film having a uniform and excellent appearance without being attacked.
- nickel plating a well-known nickel plating bath can be used, for example, a normal watt bath can be used. That is, an aqueous solution containing about 200 to 350 g / l of nickel sulfate, about 30 to 80 g / l of nickel chloride, and about 20 to 60 g / l of boric acid with a commercially available brightener for nickel plating baths can be used.
- the plating conditions may be the same as usual. For example, electrolysis is performed at a liquid temperature of about 55 to 60 ° C. and a current density of about 3 A / dm 2 , and plating may be performed to a predetermined thickness.
- chromium plating a well-known chromium plating bath can be used, and a normal sergeant bath can be used. That is, an aqueous solution containing about 200 to 300 g / l of chromic anhydride and about 2 to 5 g / l of sulfuric acid can be used.
- the plating conditions are a liquid temperature of about 45 ° C., a current density of about 20 A / dm 2 , and a predetermined film thickness. Up to plating.
- a uniform conductive film without a bridge can be formed on a non-conductive plastic molded product.
- the formed conductive film has good conductivity and is excellent in acid resistance.
- a decorative electroplated film having an excellent appearance can be formed.
- Example 1 A flat plate made of ABS resin (UMG ABS, UMG ABS3001M) having a size of 10 cm ⁇ 5 cm ⁇ thickness 0.3 cm and a surface area of about 1 dm 2 was used.
- ABS resin UMG ABS, UMG ABS3001M
- a jig for plating there was used a jig which was made of a stainless steel rod having two contact parts with an object to be processed, a contact distance of 11 cm and a contact part of ⁇ 2 mm, and other than the contact, baked and coated with a sol made of vinyl chloride.
- the object to be plated set on the jig was immersed in an alkaline degreasing agent solution (Okuno Pharmaceutical Co., Ltd .: A-screen A-220, 50 g / l aqueous solution) at 50 ° C. for 5 minutes, and washed with water. did.
- an alkaline degreasing agent solution (Okuno Pharmaceutical Co., Ltd .: A-screen A-220, 50 g / l aqueous solution) at 50 ° C. for 5 minutes, and washed with water. did.
- Etching treatment The resin surface was roughened by immersing in an etching solution comprising an aqueous solution containing 400 g / l of chromic anhydride and 400 g / l of sulfuric acid at 67 ° C. for 8 minutes.
- the article to be treated was washed with water and immersed in an aqueous solution containing 35% hydrochloric acid 50 ml / l at room temperature for 30 seconds to remove chromic acid adhering to the resin surface and thoroughly washed with water.
- the object to be treated was immersed in an aqueous solution containing 35 ml of 35% hydrochloric acid at 25 ° C. for 1 minute.
- the conductive film forming bath of the examples is sometimes referred to as “the present invention bath”. Further, the conductive film forming bath of the comparative example may be referred to as “comparison bath”.
- an electrolytic copper plating bath an aqueous solution containing copper sulfate ⁇ 5H 2 O 250 g / l, sulfuric acid 50 g / l and chloride ion 50 mg / l, Top Lucina 2000MU 5 ml / l manufactured by Okuno Pharmaceutical Co., Ltd.
- Top Lucina 2000A Using a plating bath added with 0.5 ml / l, using a phosphorous copper plate as an anode and a product to be plated as a cathode, while stirring gently with air, the temperature is 25 ° C. and the current density is 3 A / dm 2 . Copper electroplating was performed for a minute.
- Example 1 conductive films were formed under the same conditions as in Example 1 using the respective conductive film forming baths shown in Tables 1 and 2 below (Invention baths 2 to 32 and Comparative baths 1 to 26). Thereafter, it was washed with water, and electrolytic copper plating was performed under the same conditions as in Example 1.
- the coverage of the copper plating film formed by the above method and the plating appearance were evaluated by the following methods. Further, the surface resistance value of the conductive film after the conductive film formation treatment and the surface resistance value of the conductive film when immersed in a copper sulfate plating bath for 5 minutes in a non-energized state were also measured.
- the surface resistance value (evaluation method) was measured after the conductive film was formed and immersed in a copper sulfate plating bath for 5 minutes in a non-energized state.
- the surface resistance value was measured with a simple tester between 1 cm in width.
- Test Example 2 Appearance after electrolytic copper plating When the inventive baths 1 to 32 were used, as shown in FIG. 2, a plating film having a very excellent gloss appearance was formed, and no surface defects were observed. .
- Comparative Baths 1 to 26 were used, as shown in FIG. 1, the coating was not completely covered, pits and star dust were generated, and a plating film having a wavy wrinkle appearance was formed.
- the surface resistance value of the conductive film after being immersed in a strongly acidic copper sulfate plating bath for 5 minutes is more than the surface resistance value after the conductive film formation treatment. All had low values and had excellent conductivity.
- an excellent conductive film can be formed on a non-conductive plastic molded article provided with a catalyst.
- a copper plating solution it is considered that the copper oxide on the conductive film causes a disproportionation reaction, a dense film containing metallic copper is formed, and the conductivity of the film is improved.
- inventive baths 26 to 32 (Example Nos. 26 to 32) containing a carboxyl group-containing reducing compound and a reducing saccharide having 6 or more carbon atoms simultaneously as the reducing agent (E) are particularly conductive. Both the surface resistance value after the film formation treatment and the surface resistance value of the conductive film after being immersed in a strongly acidic copper sulfate plating bath for 5 minutes were remarkably lowered and had excellent conductivity.
- inventive baths 1 to 32 exhibited performance superior to the comparative baths 1 to 26 in terms of plating coverage, appearance, and surface resistance.
- the inventive bath 1 using ethylene glycol having 2 carbon atoms between two hydroxyl groups had excellent conductivity even when the amount of the aliphatic polyalcohol was small.
- the conductive film forming bath uses an aliphatic polyalcohol having 3 or more carbon chains between hydroxyl groups, the blending amount of the aliphatic polyalcohol is changed from 50 g / l to 100 g / l or 200 g / l. It was found that by increasing the surface resistance value after 5 minutes of immersion in the copper sulfate plating bath, the conductivity can be improved.
- Table 6 shows the relationship between the coverage of the object to be processed after the formation of the conductive film using the conductive film forming bath of the present invention and the subsequent electrolytic copper plating treatment and the palladium concentration in the catalytic treatment step. .
- the present invention bath 1 (Example No. 1) containing a carboxyl group-containing reducing compound as the reducing agent (E), and the present invention bath 12 (Example No. 1) containing a saccharide exhibiting reducing properties having 6 or more carbon atoms. In case of .12), the plating was completely covered when the palladium concentration was 50 mg / l.
- the present invention bath 31 (Example No. 31) containing a carboxyl group-containing reducing compound and a saccharide having a reducing property of 6 or more carbon atoms at the same time has a lower palladium concentration of 35 mg / Even in the case of l, the plating was completely covered (Example No. 31).
- the conductive film-forming bath containing a carboxyl group-containing reducing compound and a reducing saccharide having 6 or more carbon atoms simultaneously as a reducing agent is excellent in appearance even if the amount of the catalyst is reduced. It was found that plating was possible.
- a comparative bath containing an aliphatic polyalcohol compound having 2 to 5 carbon atoms, a carboxyl group-containing reducing compound or a saccharide having a reducing property having 6 or more carbon atoms alone is used to completely coat copper sulfate plating.
- the copper content in the film was measured by dissolving the conductive film with aqua regia and calculating the copper content in the film from the copper concentration contained in the dissolved aqua regia.
- the surface resistance value was measured with a simple tester between 1 cm in width.
Abstract
Description
1.(A)銅化合物、
(B)錯化剤、
(C)アルカリ金属水酸化物、
(D)炭素数2~5の脂肪族ポリアルコール化合物、並びに
(E)基:-COOM(式中、Mは、H、アルカリ金属、又は基:-NH4を示す。)を有する還元性化合物、及び炭素数6以上の還元性を示す糖類からなる群から選ばれた少なくとも1種の化合物
を含有する水溶液からなる導電性皮膜形成浴。
2.前記(E)成分として、基:-COOM(式中、Mは、H、アルカリ金属又は基:-NH4を示す。)を有する還元性化合物、及び炭素数6以上の還元性糖類の両方を含有する項1に記載の導電性皮膜形成浴。
3.項1又は2に記載の導電性皮膜形成浴に、触媒物質を付与した非導電性プラスチック成形品を接触させることを特徴とする非導電性プラスチック成形品に導電性皮膜を形成する方法。
4.前記導電性皮膜形成浴中の溶存酸素を増加させた状態で、該導電性皮膜形成浴に非導電性プラスチック成形品を接触させる、項3に記載の導電性皮膜を形成する方法。
5.前記溶存酸素を増加させた状態にする手段が、酸素含有ガスをバブリングして供給する方法、又は酸化剤を添加する方法である、項4に記載の導電性皮膜を形成する方法。6.項3~5のいずれかに記載の方法で導電性皮膜形成浴を用いて導電性皮膜を形成した後、電気めっきを行う工程を含む、非電導性プラスチック成形品への電気めっき方法。
(A)銅化合物、
(B)錯化剤、
(C)アルカリ金属水酸化物、
(D)炭素数2~5の脂肪族ポリアルコール化合物、並びに
(E)基:-COOM(式中、Mは、H、アルカリ金属、又は基:-NH4を示す。)を有する還元性化合物、及び炭素数6以上の還元性を示す糖類からなる群から選ばれた少なくとも1種の化合物。
(A)銅化合物
本発明の導電性皮膜形成浴には、銅化合物を配合する必要がある。配合する銅化合物としては、水溶性の銅化合物であればよく、例えば、硫酸銅、塩化銅、炭酸銅、水酸化銅等を使用できる。
本発明の導電性皮膜形成浴には、錯化剤を配合する必要がある。配合する錯化剤としては、銅イオンに対して有効な公知の錯化剤を使用することができ、例えば、ヒダントイン類、有機カルボン酸類等を用いることができる。
本発明の導電性皮膜形成浴には、アルカリ金属水酸化物を配合する必要がある。配合するアルカリ金属水酸化物としては、入手の容易性、コスト等の点から、水酸化ナトリウム、水酸化カリウム、水酸化リチウム等が適当である。
本発明の導電性皮膜形成浴には、炭素数2~5の脂肪族ポリアルコールを配合する必要がある。配合する炭素数2~5の脂肪族ポリアルコールとしては、ヒドロキシ基を2個以上有する炭素数2~5の直鎖状又は分枝鎖状の脂肪族ポリアルコールであればよい。また、当該脂肪族ポリアルコール中の炭素鎖には、酸素原子が含まれていてもよい。
本発明の導電性皮膜形成浴には、還元剤として、カルボキシル基含有還元性化合物、及び炭素数6以上の還元性を示す糖類からなる群から選ばれた少なくとも1種の化合物を用いることが必要である。このような特定の還元剤を用いることによって、ブリッジ析出性のない均一な導電性皮膜を形成できる。
本発明の導電性皮膜形成浴に配合するカルボキシル基含有還元性化合物としては、基:-COOM(式中、Mは、H、アルカリ金属、又は基:-NH4を示す。)を有し、かつ、還元性を示す化合物であれば特に限定はなく、公知の化合物が使用できる。
本発明の導電性皮膜形成浴に配合する炭素数6以上の還元性を示す糖類としては、炭素数が6以上で、かつ、還元性を示す糖類であれば特に限定はなく、公知の糖類が挙げられ、例えば、単糖類、二糖類、オリゴ糖類、多糖類、糖アルコール、糖酸、アミノ糖、デオキシ糖、ラクトン等が使用できる。
本発明の導電性皮膜形成浴に、触媒物質を付与した非導電性プラスチック成形品を接触させることによって、非導電性プラスチック成形品に導電性皮膜を形成することができる。
非導電性プラスチックとしては、特に限定はなく、例えば、自動車業界等において近年広く採用されている各種のプラスチック部品も処理対象物とすることができる。
本発明の導体性皮膜を形成する方法では、まず、前処理として、常法に従って、指紋、油脂等の有機物、静電気作用による塵等の付着物等を除去するために、被処理物の表面を清浄化する。処理液としては、公知の脱脂剤を用いればよく、例えば、アルカリタイプの脱脂剤等を使用して、常法に従って脱脂処理等を行えばよい。
次いで、前処理工程によって得られた処理物に対して、触媒を付与する。
次いで、触媒を付与した非導電性プラスチック成形品に対して、本発明の導電性皮膜形成浴を用いて導電性皮膜を形成する。
本発明の導電性皮膜形成浴を用いて、触媒を付与した非導電性プラスチック成形品に対して導電性皮膜を形成することができる。導電性皮膜としては、主に酸化銅を含む皮膜が形成される。
次いで、本発明の導体性皮膜形成浴によって得られた被処理物を、常法に従って電気めっき処理に供する。
被処理物として、10cm×5cm×厚さ0.3cm、表面積約1dm2のABS樹脂製(UMG ABS(株)製、UMG ABS3001M)の平板を用いた。
めっき用治具としては、被処理物との接点部位2カ所、接点間隔11cmで、接点部がφ2mmのステンレス棒からなり、接点以外は塩化ビニル製ゾルで焼き付けコーティングした治具を用いた。
まず、治具にセットした被めっき物を、アルカリ系脱脂剤溶液(奥野製薬工業(株)製:エースクリーンA-220、50g/l水溶液)中に50℃で5分間浸漬し、水洗した。
無水クロム酸400g/l及び硫酸400g/lを含有する水溶液からなるエッチング溶液中に67℃で8分浸漬して、樹脂表面を粗化した。
その後被処理物を水洗し、35%塩酸50ml/lを含有する水溶液に室温で30秒間浸漬して、樹脂表面に付着したクロム酸を除去し、充分に水洗した。
次に、プリディップ処理として、35%塩酸250ml/lを含有する水溶液に被処理物を25℃で1分間浸漬した。
塩化パラジウム 83.3mg/l(Pdとして50mg/l)、塩化第一錫 8.6g/l(Snとして4.5g/l)、35%塩酸250ml/lを含有するpH1以下のコロイド溶液中に、35℃で6分間浸漬して、被処理物に均一に触媒を付着させた。
その後水洗を行い、下記表1の実施例番号No.1の導電性皮膜形成浴(本発明浴1)を用い、浴温45℃で、5分間被処理物を浸漬して導電性皮膜を形成した。
その後充分水洗し、治具を変えることなく次工程の電気銅めっきに移行した。
電気銅めっき浴としては、硫酸
銅・5H2O 250g/l、硫酸 50g/l及び塩素イオン50mg/lを含有する水溶液に、光沢剤として奥野製薬工業(株)製のトップルチナ2000MU 5ml/l及びトップルチナ2000A 0.5ml/lを添加しためっき浴を用い、含リン銅板を陽極とし、被めっき品を陰極として、ゆるやかなエアー攪拌を行いながら、液温25℃、電流密度3A/dm2で5分間電気銅めっきを行った。
実施例1と同様の被処理物と治具を用い、触媒付与工程まで実施例1と同様にして行なった。
(評価方法)電気銅めっき後、銅めっきが被覆されているテストピース表面の面積割合を求めた。
(評価方法)電気銅めっき後のピット及びスターダストの有無、並びに光沢度を目視で判定した。
(評価方法)導電性皮膜形成処理後及び無通電状態で硫酸銅めっき浴に5分浸漬した後に測定した。
本発明浴1~32を用いた場合には、被覆率がいずれも100%の割合で被覆することができた。
本発明浴1~32を用いた場合には、図2に示すとおり、非常に優れた光沢外観のめっき皮膜が形成され、表面欠陥は認められなかった。
本発明浴1~32を用いた場合には、導電性皮膜形成処理後の表面抵抗値が、いずれも低い値となった。
本発明の導電性皮膜形成浴に配合される炭素数2~5の脂肪族ポリアルコールとして、2つのヒドロキシル基間の炭素数が3以上のジエチレングリコール、1,3-プロパンジオールを使用した浴(本発明浴33~38)、及び2つのヒドロキシル基間の炭素数が2のエチレングリコールを使用した浴(本発明浴1)の導電性皮膜の表面抵抗値を表5に示す。
本発明の導電性皮膜形成浴を用いて、導電性皮膜を形成し、続く電気銅めっき処理を行なった後の被処理物の被覆率と触媒化処理工程におけるパラジウム濃度の関係を表6に示す。
下記の各試験浴を用いて、浴中の溶存酸素量と、酸化銅皮膜形成の関係を試験した。(比較浴11)
(A)硫酸銅・5水和物:4g/l
(B)ロッシェル塩:20g/l
(C)水酸化ナトリウム:65g/l
(E)グルコノラクトン:0.5g/l
(比較浴15)
(A)硫酸銅・5水和物:4g/l
(B)ロッシェル塩:20g/l
(C)水酸化ナトリウム:65g/l
(D)エチレングリコール:50g/l
(本発明浴12)
(A)硫酸銅・5水和物:4g/l
(B)ロッシェル塩:20g/l
(C)水酸化ナトリウム:65g/l
(D)エチレングリコール:50g/l
(E)グルコノラクトン:0.5g/l
(評価方法)
導電性皮膜形成後、無通電状態で酸性の硫酸銅めっき液に5分間浸漬して、皮膜中の銅の含有量および表面抵抗値を測定した。
Claims (6)
- (A)銅化合物、
(B)錯化剤、
(C)アルカリ金属水酸化物、
(D)炭素数2~5の脂肪族ポリアルコール化合物、並びに
(E)基:-COOM(式中、Mは、H、アルカリ金属、又は基:-NH4を示す。)を有する還元性化合物、及び炭素数6以上の還元性を示す糖類からなる群から選ばれた少なくとも1種の化合物
を含有する水溶液からなる導電性皮膜形成浴。 - 前記(E)成分として、基:-COOM(式中、Mは、H、アルカリ金属又は基:-NH4を示す。)を有する還元性化合物、及び炭素数6以上の還元性糖類の両方を含有する請求項1に記載の導電性皮膜形成浴。
- 請求項1又は2に記載の導電性皮膜形成浴に、触媒物質を付与した非導電性プラスチック成形品を接触させることを特徴とする非導電性プラスチック成形品に導電性皮膜を形成する方法。
- 前記導電性皮膜形成浴中の溶存酸素を増加させた状態で、該導電性皮膜形成浴に非導電性プラスチック成形品を接触させる、請求項3に記載の導電性皮膜を形成する方法。
- 前記溶存酸素を増加させた状態にする手段が、酸素含有ガスをバブリングして供給する方法、又は酸化剤を添加する方法である、請求項4に記載の導電性皮膜を形成する方法。
- 請求項3~5のいずれかに記載の方法で導電性皮膜を形成した後、電気めっきを行う工程を含む、非電導性プラスチック成形品への電気めっき方法。
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US10036097B2 (en) | 2018-07-31 |
JPWO2014098064A1 (ja) | 2017-01-12 |
EP2937447B1 (en) | 2018-10-10 |
US20150322585A1 (en) | 2015-11-12 |
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