Nippon Paint Compnay, Ltd.

Akio Kashihara

Shinichi Ishikura

Keizou Ishii

Tadafumi Miyazono

Naoya Yabuuchi

Chikayuki Otsuka

Kazunori Kanda

Katsuaki Kida

Yoshikazu Yamagami

Masayuki Maruta

Teruaki Kuwajima

Hiroshi Miwa

Masanori Ohiwa

Toshihiro Maekawa

Syuhei Numata

Ryuzo Mizuguchi

Hisaki Tanabe

Katsukiyo Ishikawa

Mamoru Seio

Akihiro Kanakura

Kiyomi Sakurai

Haruhiko Sato

Shinji Seo

Hiromichi Kayano

Eio Hisajima

Mitsuo Yoshioka

A method of producing multilayer circuit boardschar comprising repeating a procedure comprising the steps of (1) laminating a photosensitive film composition shaped in a film form onto an insulating material carrying a conductor pattern formed thereon, (2) exposing the laminated photosensitive film composition to light through a negative type photomask, (3) dissolving the domains not irradiated in the above exposure step, (4) heat-curing the domains not dissolved in step (3), (5) forming a copper plating layer on the surface of the photosensitive film composition heat-cured in step (4) by electroless copper plating with or without further electroplating of copper, and (6) forming, on the plated copper layer formed in step (5), a photosensitive etch resist layer and subjecting said layer to light exposure through a photomask having a circuit pattern drawn thereon, developing and etching to thereby form a conductor pattern, said photosensitive film composition for lamination containing at least 50% by weight of a bisphenol-epichlorohydrin type resin containing photosensitive functional groups and heat-curable functional groups.

Method of producing multilayer circuit boards

The present invention provides an improved method for forming a patterned solder mask having preferred electric insulating property, heat resistance-and chemical resistance on a printed circuit board with high resolution.

Method for forming patterned solder mask

The present invention has as its object providing a solder mask which permits high density mounting, is suitable for protecting conductor circuits, particularly has mask thickness on the circuit parts and each edge part of the circuits which make almost no difference from those on other parts, and is excellent in electrical insulation, heat resistance and solvent resistance. This invention provides a method of forming a solder mask for printed circuit boards, using any powder paint which is curable by both irradiation of ultraviolet ray and heat, comprising:

Method of forming solder mask

Disclosed is a process for preparing a colored polymer without color change between a reactant color dye and an obtained polymer. The process of the present invention comprises polymerizing a vinyl polymerizable monomer (A), and a polymerizable dye (B) prepared by reacting a (meth)acryloyl compound having a group reactive with an active hydrogen, with a dye represented by the formula: ##STR1## wherein R.sub.1 and R.sub.2, which are the same or different, show a hydrogen atom or a group having the formula; ##STR2## (R.sub.3 represents --(CH.sub.2)m-NH.sub.2, or --(CH.sub.2)m-OH, R.sub.4 represents a hydrogen atom, an alkyl group, a cycloalkyl group or an allyl group, n is an integer of 1 to 5 and m is 0 or an integer of 1 to 5), provided that both R.sub.1 and R.sub.2 do not represents a hydrogen atom, X and Y, which are different, --OH or --NHR.sub.1, in the presence of a polymerization initiator, and a color difference between the polymerizable dye and the obtained colored vinyl polymer is within .+-. 3 nm by absorption spectrum.

Production of colored vinyl polymer particles by polymerizing a vinyl

Dry toner for electrophotography in the form of colored particles, each particle being composed of a colored core portion having an average diameter of 5 to 20.mu. and comprising as main ingredients, a coloring material and heat-meltable resin having a flow initiation temperature of 120.degree. C. to 160.degree. C., and a covering shell portion of a vinyl resin mixture of a comparatively low molecular weight component and a high molecular weight component, each having the maximum value in the molecular weight distribution curve obtained by gel-permeation chromatography of 8.times.10.sup.3 to 3.times.10.sup.4 and 8.times.10.sup.4 to 5.times.10.sup.5, respectively, and present in a ratio of Mw/Mn=5.0 or more; the weight ratio of said vinyl resins to the total weight of said core and shell portions being 8 to 25% by weight. The present dry toner is particularly useful for use in a high speed electrography.

Dry toner for high speed electrophotography

Novel crosslinked polymer microparticles having a mean grain diameter of 0.01 to 10.mu., whose polymer carries urea, urethane or amide groups. The invention also provides a coating composition containing said crosslinked polymer microparticles, which is excellent in application characteristics and storage stability and is capable of providing a coating with excellent film properties.

Crosslinked polymer microparticles and coating composition containing

Novel composite resinous film comprising a continuous phase of at least one resin and a discontinuous phase of microdomains which are aggregates of particles of at least one insoluble resin and are 0.03 to 10 microns in size, is provided. The film can exhibit the most desirous properties of the respective, constituent resinous materials and are useful in various fields including the paint industry.

Composite film and preparation thereof

The present invention provides a process for producing toner which has very narrow particle size distribution and contains a uniformity dispersed pigment therein. The process comprises dispersion-polymerizing

Dispersion-polymerization process for producing a toner containing a

Polymer microparticles having a three-dimensional network structure and an average particle size of 0.01 to 1 micron are obtained by emulsion polymerization of ethylenically unsaturated monomeric composition containing (a) at least one polyfunctional monomer having a plurality of polymerizable sites, or (b) a combination of two ethylenically unsaturated monomers each bearing mutually reactive functional groups in an aqueous medium in the presence of a compound or resin having a betaine group. The betqine compound or resin is incorporated into the polymer microparticles by physically adhering or covalently binding thereto to enhance the dispensing stability of the microparticles over a wide range of pH.

Crosslinked polymer microparticles derived from betaine monomers having

Disclosed is a process for preparing polymer particles suitable for electrophotographic toner. The substantially spherical resin particles have a weight average particle size of 1 to 30 microns and contain a carbon atom as main component, a silicon atom in an amount of 1.times.10.sup.-1 to 7% by weight and/or a fluorine atom in an amount of 1.times.10.sup.-2 to 2% by weight. The particles are prepared by polymerizing a polymerizable monomer in an organic solvent having a higher solubility parameter (SP value) than the resultant polymer by at least 1.0 in the presence of a dispersion stabilizer which is soluble in said organic solvent and which has a dialkylsiloxane bond and/or a fluorine atom, and then removing said organic solvent.

Resin particles

Novel composite film and preparation thereof

Composite resin particles each comprising a particulate crosslinked polymer to which a number of substantially linear, metal-containing polymer chains are chemically bonded. The invention also provide methods for the preparation of said composite resin particles. The present composite resin particles have self-film forming properties, can give a stable dispersion in an organic solvent or a resinous varnish and are specifically useful in paint industries. The particles are further characterized by having the desired properties of the metal element contained therein, as, for example, self-catalytic function in crosslinking, excellent biological activities and the like.

Composite resin particles and preparation thereof

A two component polyurethane coating consisting of a principal component (A) comprising a hydroxyl group containing film-forming resin, crosslinked polymer particles and a solvent for said film-forming resin and a hardener component (B) comprising a polyisocyanate compound, which is characterized by using as the crosslinked polymer particles composite resin particles each comprising a particulate crosslinked polymer core and a number of substantially linear polymer chains coupled with said core by either chemical bonding, semi-interpenetration or both, and containing metal element in either portion of said core, said polymer chains or both of them; the solid weight ratio of said hydroxyl group containing film-forming resin to said composite resin particles being 99/1 to 40/60 and the equivalent ratio of isocyanate groups in the hardener component (B) to hydroxyl groups in the principal component (A) (if the linear polymer chains contain hydroxyl groups, the sum of said hydroxyl groups and those of the film-forming resin) being 0.5 to 2.0. The coating composition is excellent in dispersion stability, application characteristics and drying fastness and capable of resulting in an excellent coating.

Two component polyurethane coating

Resinous microparticles useful in toner for electrophotography which are made of vinyl resin obtained by emulsion polymerization of at least one .alpha.,.beta.-ethylenically unsaturated monomers in the presence of cationic surfactant having an onium salt structure and a polymerization initiator having an amidine or amidine salt structure and whose average particle diameter is in a range of from 0.01 to 1.mu., and toner composition comprising toner particles and resinous microparticles as abovementioned are provided.

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Hirakata, Japan

Akio Kashihara