摘要:
Highly precise wiring formed on an insulating substrate can be obtained by electroless deposition without using a printing process. Said process is characterized by forming an adhesive layer containing a photo-setting substance on a substrate, exposing the adhesive layer to actinic light imagewisely so as to irradiate only portions other than those forming wiring, treating the surface of the substrate with a roughening solution so as to roughen the portions not exposed to actinic light, and subjecting to the conventional treatments for electroless deposition so as to form prescribed wiring on the portions not exposed to actinic light.
摘要:
Printed circuits are produced on an insulating substrate by electroless metal plating according to a method comprising steps of:(I) forming a plating resist on a negative pattern of circuit with a masking material having an effect upon reducing the deposition of an initiator for electroless metal plating, and depositing the initiator onto the entire surface of the insulating substrate,(II) removing the initiator from the surface of said resist, and(III) dipping the insulating substrate in an electroless metal plating solution, thereby forming an electroless metal plating on a positive pattern of circuit, wherein a thermosetting resin containing a rutile type solid solution of metal oxides of titanium, nickel and antimony is employed as the masking material in said step (I), and the initiator is removed from the surface of the resist through contact with a hydrochloric acid solution of ammonium persulfate in said step (II).
摘要:
When an alkaline earth metal carbonate powder is mixed with an adhesive and is formed into an adhesive layer in a conventional covering method, a problem of the transfer of catalyst for electroless plating during a masking step or later electroless plating step is solved. Further, blisters under plated film caused by a fire retardant contained in an insulating substrate is also overcome by the use of alkaline earth metal powder.
摘要:
An electroless copper solution capable of forming an electroless deposited copper film having as a higher elongation as that of electro deposited copper film is provided, which is characterized by adding either 2,2'-dipyridyl or 2,9-dimethyl-1,10-phenanthroline, and polyethylene glycol to the well known electroless copper solution containing a copper salt, such as cupric sulfate, a complexing agent such as ethylenediaminetetraacetic acid, a reducing agent such as formalin, and a pH-adjusting agent such as alkali hydroxide as main components.The present copper solution can provide not only a higher elongation of deposited film, but also higher depositing rate, about 3 - 4 .mu.m/hr, which is equal or superior to that of the conventional art.
摘要:
A printed circuit board comprising an insulating board deposited with a catalyst having reactivity against electroless plating deposition, a resist for electroless plating provided on the insulating board excepting the part where a circuit is to be formed and a circuit formed by electroless plating, wherein the resist for electroless plating contains a coupling agent having a function of preventing the catalyst from ionizing. A process for producing the printed circuit board in which the insulating board surface excepting the part where a circuit is to be formed is covered with a resist for electroless plating containing a coupling agent having a function of preventing the catalyst from ionizing. Use of said resist for electroless plating can prevent drop of insulation resistance of the insulating board after moisture absorption.
摘要:
This invention concerns a method for the manufacture of a printed wiring board which particularly proves useful as a printed coil. This method is characterized by the fact that in the work in process which has undergone the step for formation of a conductor circuit and which has not undergone the step for separation of a plating resist, the plating resist and other insulating substratal material are separated for transfer from the surface of the substrate having the conductor circuit formed thereon.Since this method permits formation of an extremely thin insulating layer and a conductor circuit layer thicker than the insulating layer, it enables production of very thin printed wiring board and printed coil having high circuit density in the surfaces of component layers as well as in the direction of superposition of component layers.
摘要:
A process for producing a printed circuit board which comprises forming a plating film forming adhesive layer on the whole exposed surface of an insulating board, roughening said adhesive layer surface, depositing a catalyst for electroless copper plating on said adhesive layer surface from a catalyst solution, masking the thus treated insulating board surface excepting the part where a circuit is to be formed, and then performing the electroless copper plating on the catalyst of the board to form a circuit thereon, wherein an improvement comprises treating the roughened adhesive layer surface with an alkaline solution before depositing the catalyst thereon and treating the masked insulating board with an aqueous solution containing a surfactant before performing the electroless copper plating. The above process assures a higher copper utilization and a large adhesive strength of the copper plating to the board.
摘要:
The present invention provide a process for producing printed circuit boards which comprises the steps of(a) roughening a surface of a copper layer formed on an insulating board.(b) coating the roughened surface of copper layer with a photo-resist layer containing a sublimable copper-corrosion inhibitor, exposing the resist layer selectively to actinic rays according to a circuit pattern to form, and developing the resulting resist layer, thereby forming plating-resist coats on circuit-negative pattern portions of the copper layer,(c) heat-treating the plating-resist coats,(d) plating chemically the circuit-corresponding portion with copper,(e) removing the plating-resist coats, and(f) removing the copper layer except the circuit-corresponding portion thereof.
摘要:
A photo-curable resist resin composition for electroless plating comprising an epoxy resin having a viscosity of at least 150 poises at 25.degree. C., and at least two glycidyl ether groups in one molecule, the glycidyl ether groups being directly bonded to the aromatic ring as Component A, an oxirane ring-containing compound having a boiling point of at least 140.degree. C. and a molecular weight of not more than 500 as Component B, and a photo-sensitive aromatic onium salt as Component C, wherein the Component A is in an amount of 90 to 40 parts by weight per total 100 parts by weight of the Components A and B, and the Component C is in an amount of 0.1 to 5 parts by weight per total 100 parts by weight of the Components A and B, and, if any, other resin components, can produce a resist film capable of withstanding highly alkaline electroless copper plating solution at a high temperature for a long time without any decrease in the physical properties of plating films deposited even by repeated use of the electroless copper plating solution. The resist film prepared from the resist resin composition has distinguished soldering heat resistance, solvent resistance and electrical insulation.
摘要:
In a process for electroless copper plating in an electroless copper plating solution containing a copper salt, a complexing agent for the copper salt, a reducing agent for the copper salt, and a pH-adjusting agent, a plating film having distinguished mechanical properties can be obtained by adding at least one of soluble inorganic silicon compounds and soluble inorganic germanium compounds and conducting the electroless copper plating by injecting an oxygen-containing gas into the plating solution or by adding an oxidizing agent to the plating solution or by both injection or the oxygen-containing gas and addition of the oxidizing agent thereto. The stability of the electroless copper plating solution can be maintained better thereby and substantially thick plating is possible.