Abstract: A method of metal-plating electrode portions of a printed-wiring board includes copper-plating the overall surface of the printed-wiring board on which an electric circuit has been formed, forming a metal plating resist coating on the copper plated wiring board except for on the electrode portions, and subjecting the electrode portions, which are not covered with the resist coating, to an electrolytic metal plating process, at least once, and then removing the remaining resist coating. The resist coating formation and the electrolytic metal plating process may optionally be repeated a predetermined number of times. An etching resist coating is then formed on the circuit portion including the electrode portions, and the copper-plated portion is then removed except from the circuit portion by etching and then stripping the etching resist coating.

Abstract: A method for forming a resist pattern which comprises irradiating an active light ray to a resist obtained by coating a photosensitive resin composition containing a compound capable of generating an acid due to irradiation of the active light ray and a silyloxy compound in a binder resin on a substrate through a pattern mask to decompose the silyloxy compound due to the acid generated at the irradiation region to form a silanol compound, and after removing the silanol compound, removing a film at the photosensitive region due to an oxygen plasma, a removal of said silanol compound being conducted by bringing the film after irradiation of the active light ray into contact with volatile organic solvent vapor having a boiling photosensitive composition.

Abstract: Water spotting which occurs during rinsing of an electrodeposited photosensitive resist composition on a copper layer of a printed circuit board is reduced by applying an aqueous solution containing a surfactant. The surfactant is preferably a salt of an acylated polypeptide which is solid at ambient room temperature and forms a thin uniform film when the solution is dried.

Abstract: A method for forming a resist pattern comprising applying onto a base plate a resinous composition comprising a compound capable of generating an acid when irradiated with actinic rays to obtain a photosensitive layer, exposing the thus formed layer through a pattern mask to actinic rays, applying onto the whole surface of the layer an alkoxysilane gas and subjecting the thus treated layer to dry etching to remove unexposed area of said layer. By the adoption of the present method, a very fine resist pattern which is useful for the preparation of semiconductor element, magnetic bubble memory element and the like, can be easily and economically prepared.

Abstract: A novel positive type photosensitive resinous composition comprising a base resin having in at least one side chain or at an end portion of its main chain, an iminosulfonate group of the formula: ##STR1## in which R.sub.1 and R.sub.2 are the same or different groups and each represents hydrogen atom, alkyl, acyl, phenyl, naphthyl, anthryl or benzyl group and R.sub.1 and R.sub.2, taken together with the carbon atom, may be an alicyclic ring, the composition further comprising a group containing an acid-decomposable bond, the content of said iminosulfonate group being 1.times.10.sup.-5 to 3.times.10.sup.-3 equivalent/g of the base resin. The present composition, when irradiated with radiation with 200 to 400 nm wavelength, can generate strong sulfonic acid groups, and is specifically useful as a photoresist for a circuit board, integrated circuit and the like.

Abstract: The invention provides an aqueous electrodeposition coating composition for a positive working resist and an image-forming method using the same. The coating composition is very stable under storage conditions and is capable of resulting in a positive working resist which is specifically useful in the preparation of a printed circuit board with mini-via-holes.

Abstract: The invention provides an aqueous electrodeposition coating composition for a positive working resist and an image-forming method using the same. The coating composition is very stable under storage conditions and is capable of resulting in a positive working resist which is specifically useful in the preparation of a printed circuit board with mini-via-holes.

Abstract: The invention provides a positive type photosensitive resinous composition comprising a resin obtained by the reaction of a polyepoxide compound, an aromatic or heterocyclic carboxylic acid bearing a phenolic hydroxyl group(s) and 1,2-quinondiazido sulfonic acid halide with the use of those three components in a defined proportion, which is useful for microfabrication photo-resist and photosensitive materials for use in lithographic plates because of excellent flexibility and adhesion to supporting substrates, when developed, non-exposed area are extremely resistive toward swelling.

Abstract: The invention provides a photosensitive resin composition specifically useful for microfabrication resist films and photosensitive materials for use in lithographic plates because of excellent flexibility and adhesion, and moreover, when developed, non-exposed parts being of extremely less swelling nature.

Abstract: A positive type photosensitive resinous composition which is specifically useful in a photoresist for printed circuit board, integrated circuit board and the like and in a lithographic plate is provided.The resinous composition is characterized by comprising a resin having in its side chains or at the end portions of main chain at least one iminosulfonate group of the formula: ##STR1## in which R.sub.1 and R.sub.2 each is selected from hydrogen atom, an alkyl, an acyl, a phenyl, a naphthyl, an anthryl and a benzyl group, or R.sub.1 and R.sub.2 may, taken together, form an alicyclic ring, the iminosulfonate content being 1.5.times.10.sup.-4 to 2.5.times.10.sup.-3 equivalent/g and the resin being free from glycidyl group or the like which may cause polymerization in the presence of sulfonic acid.

Abstract: The invention provides a method for preparing a printed circuit board with plated-through-holes, using a specifically prepared photoresist material and a combination of exposure, development and etching means. This method is particularly useful for the preparation of a printed circuit board with plated-through-holes bearing a high density circuit pattern.

Abstract: The invention provides a method for preparing a printed circuit board with solder plated circuit and through-holes, using a specifically prepared photoresist material and a combination of exposure, development, solder plating and etching means.This method is particularly useful for the preparation of a printed circuit-board with solder plated circuit and through-holes bearing a high density circuit pattern.

Abstract: A method for cationic electrocoating which comprises electrocoating a substrate in an electrocoating composition comprising an electrocoating resin having a reactive group admixed with a paste comprising a chromate pigment in a water-insoluble or hardly soluble, reactive group-containing organic binder and said paste having a water content of not more than 2% by weight and said composition having a concentration of 200 to 5,000 ppm in terms of CrO.sub.3, the reactive group in the electrocoating resin being crosslinkable with the reactive group in the organic binder. The formed electrocoating film has high rust prevention.

Abstract: The invention provides a method for preparing a printed circuit board with plated-through-holes, using a specifically prepared photoresist material and a combination of exposure, development and etching means. This method is particularly useful for the preparation of a printed circuit board with plated-through-holes bearing a high density circuit pattern.