Abstract:
A process for forming bumps on electrode pads performs at least the following steps (a) to (d) for a wiring board including a substrate and a plurality of electrode pads: (a) a step of forming a laminated two-layer film on the wiring board and forming a pattern of apertures at positions corresponding to the electrode pads, the laminated two-layer film including a lower layer containing an alkali-soluble radiation-nonsensitive resin composition and an upper layer containing a negative radiation-sensitive resin composition; (b) a step of filling a low-melting metal in the aperture pattern; (c) a step of reflowing the low-melting metal by pressing or heating to form bumps; and (d) a step of peeling and removing the laminated two-layer film from the board. The laminated film including two layers with different properties permits high resolution and easy peeling.
Abstract:
A radiation sensitive composition comprising (A) a copolymer comprising recurring units of a p-hydroxystyrene unit and a styrene unit having an acetal group or a ketal group at the p-position, (B) a copolymer comprising recurring units of a t-butyl (meth)acrylate unit and a p-hydroxystyrene unit, and (C) a radiation sensitive acid-generating agent.
Abstract:
A method for forming a bump on an electrode pad characterized in that at least the following steps (a)-(d) are conducted on a wiring substrate which is composed of a base and a plurality of electrode pads: (a) a step wherein a double-layered film composed of a lower layer made of an alkali-soluble, radiation-nonsensitive resin composition and an upper layer made of a negative, radiation-sensitive resin composition is formed on the wiring substrate, and then an aperture pattern is formed in a corresponding position of the electrode pad; (b) a step wherein a low-melting metal is introduced into the aperture pattern; (c) a step wherein the low-melting metal is reflowed by conducting a press or a heat treatment so as to from a bump, and (d) a step wherein the double-layered film is removed from the substrate. By using the double-layered film having different characteristics, the high-resolution property and the easy-release property become compatible.
Abstract:
A method of forming a film by vapor deposition and/or sputtering by the lift-off technique and a two-layer resist film with which a burr-free film layer can be easily formed on a substrate surface. The method of forming a pattern uses this two-layer resist film. The method of pattern formation is characterized by including the step of forming, on a substrate 1, a two-layer film which comprises: a resist film 2 formed from a positive radiation-sensitive resin composition comprising A a radical polymer having a hydroxy and/or carboxy group, B a compound having a quinonediazide group, and C a solvent and a resist film 3 formed from a positive radiation-sensitive resin composition comprising D a polymer having a phenolic hydroxy group, E a compound having a quinonediazide group, and F a solvent.
Abstract:
PROBLEM TO BE SOLVED: To provide a cured product excellent in properties such as resolution, thermal shock resistance, curing shrinkage ratio and water absorption, and a positive photosensitive insulating resin composition capable of giving the cured product. SOLUTION: The positive photosensitive insulating resin composition contains an alkali-soluble resin (A) having a constitutional unit represented by formula (1), a compound (B) having a quinonediazido group, a compound (C) having a functional group capable of reacting with the alkali-soluble resin (A), and a solvent (D), wherein R represents a 1-4C alkyl group, a 1-4C alkoxy group, a halogen atom or a hydroxyl group; and m is 0-3. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a positive radiation sensitive resin composition excellent in adhesion to a substrate as well as in sensitivity and resolution, leaving no residue in an opening after development, and capable of suppressing cracking after plating, a transfer film using the composition, and a production method by which a thick plated formed product such as a bump or wiring can be formed with high dimensional accuracy. SOLUTION: The positive radiation sensitive resin composition contains (A) a polymer having an acid-dissociable functional group which is dissociated by an acid to generate an acidic functional group, (B) a vinyl alkyl ether resin represented by formula (1), (C) a component which generates an acid upon irradiation with radiation and (D) an organic solvent. In the formula (1), R 1 and R 2 are each hydroxyl or carboxyl; R 3 is a 1-4C alkyl; and n is an integer of 1-100. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a coating copolymer latex having excellent coating operability and excellent printing suitability such as surface strength, print gloss and rigidity, and to provide a paper coating composition. SOLUTION: This paper coating composition which comprises a latex of a copolymer consisting of (a) 20 to 80% by weight of an aliphatic conjugated diene monomer unit, (b) 0.5 to 10% by weight of an ethylenically unsaturated carboxylic acid monomer unit and (c) 20 to 79.5% by weight of a unit of another monomer copolymerizable with the above components (a) and (b), and having two glass transition points in the range of from -100 to 50°C, the difference between the two transition points being at least 5°C. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a positive photosensitive insulating resin composition from which a cured product with excellent characteristics such as resolution, electric insulating property, thermal shock resistance and adhesiveness can be formed, and to provide its cured product. SOLUTION: The positive photosensitive insulating resin composition contains: (A) a copolymer composed of (A1) 10 to 99 mol% of a structural unit expressed by general formula (1) and (A2) 90 to 1 mol% of a structural unit expressed by general formula (2); (B) a compound having a quinonediazide group; (C) (C1) an alky etherified amino group-containing compound and/or (C2) an epoxy group-containing compound; (D) a solvent; and (E) an adhesion improver. A cured product of the composition is also provided. In formulae, each of Ra and Rc represents a 1-4C alkyl group, alkoxy group or aryl group; each of Rb and Rd represents a hydrogen atom or a methyl group; n represents an integer of 0 to 3; and m represents an integer of 1 to 3. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a radiation-sensitive resin composition for manufacture of a semiconductor device excellent in transparency, dry etching resistance and uniformity in film thickness. SOLUTION: The radiation sensitive resin composition comprises (A) an acid cleavable group-containing resin selected from the group consisting of a resin (AI) having an alicyclic skeleton represented by formula (1) and a resin (AII) having a structure obtained by substituting the hydrogen atoms of carboxyl groups in a carboxyl-containing alkali-soluble resin by a group having an alicyclic skeleton and an acid cleavable group, (B) a radiation-sensitive acid generator and (C) a solvent comprising a mixture of a linear ketone and an alkyl 2-hydroxypropionate. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a method for peeling a bonded material off easily from a substrate without breaking the bonded material and substrate, and without leaving an adhesive on the surface of the bonded material and the surface of the substrate. SOLUTION: This method for peeling the bonded material off from the substrate comprises (I) a process of irradiating light on a laminate material where the bonded material and substrate are laminated through a cured adhesive to decompose the cured adhesive, (II) a process of heating the laminated material where the cured adhesive is decomposed, to foam the cured adhesive, and (III) a process of dissolving the foamed cured adhesive with a solvent and/or an aqueous alkaline solution for peeling the bonded material from the substrate off. COPYRIGHT: (C)2006,JPO&NCIPI