Abstract: A photosensitive resin composition comprising (A) a polyimide precursor having a polymerizable unsaturated bond; (B) a polymerizable monomer having an alicyclic skeleton; (C) a photopolymerization initiator; and (D) one or more compounds selected from the group consisting of tetrazole and a tetrazole derivative.

Abstract: A photosensitive resin composition comprising (A) a polyimide precursor having a polymerizable unsaturated bond; (B) a polymerizable monomer having an aliphatic cyclic skeleton; (C) a photopolymerization initiator; and (D) a solvent.

Abstract: A photosensitive resin composition comprising: (A) a polyimide precursor having a polymerizable unsaturated bond; (B) one or more selected from compounds represented by any of the following formulas (1) to (4); and (C) a photopolymerization initiator represented by the following formula (11), wherein in the formulas (1) to (4), R1, R2, and R8 are independently an alkyl group including 1 to 4 carbon atoms, and R3 to R7 are independently a hydrogen atom, or an alkyl group including 1 to 4 carbon atoms; s is an integer of 0 to 8; t is an integer of 0 to 4; r is an integer of 0 to 4; and in the formula (11), R11 is an alkyl group including 1 to 12 carbon atoms, an alkoxy group including 1 to 12 carbon atoms, a cycloalkyl group including 4 to 10 carbon atoms, a phenyl group, or a tolyl group; R12 is an alkyl group including 1 to 12 carbon atoms, a cycloalkyl group including 4 to 10 carbon atoms, a phenyl group, or a tolyl group; and R13 is a substituted or unsubstituted benzoyl group, a substituted or unsubstitute

Abstract: A photosensitive resin composition comprising (A) a polyimide precursor having a polymerizable unsaturated bond; (B) a polymerizable monomer having an aliphatic cyclic skeleton; (C) a photopolymerization initiator; and (D) a solvent.

Abstract: In a lead frame for an electronic component according to the present invention, a metal plate 3 is extended by a punch 5 into a hole 4 formed on a metal plate 2 and the two metal plates are connected on the inner surface of the hole 4, thereby improving a bonding strength while keeping the small size and thickness of the lead frame with a simple method.

Abstract: A method for manufacturing a lithium secondary cell comprising a positive electrode containing a lithium titanate as an active material, a negative electrode containing a carbonaceous material as an active material, and an electrolytic solution comprising a solution of a lithium salt in an organic solvent. The lithium titanate preferably has a composition of the formula: LixTiyO4 (0.8≦x≦1.4 and 1.6≦y≦2.2). The lithium secondary cell has a high capacity suitable for use as a power source for a wristwatch and good charge-discharge properties, at a nominal voltage of 1.5 V.

Abstract: A non-aqueous liquid electrolyte cell comprising a positive electrode which has a metal oxide as an active material, a negative electrode, and a non-aqueous liquid electrolyte, in which the metal oxide has an average particle size of 40 to 150 &mgr;m, and the volume of the liquid electrolyte is 0.9 to 1.25 times as large as the volume of the metal oxide, which has good characteristics even at low temperature.

Abstract: A lithium secondary cell comprising a positive electrode containing a lithium titanate as an active material, a negative electrode containing a carbonaceous material as an active material, and an electrolytic solution comprising a solution of a lithium salt in an organic solvent. The lithium titanate preferably has a composition of the formula: LixTiyO4 (0.8≦x≦1.4 and 1.6≦y≦2.2). The lithium secondary cell has a high capacity suitable for use as a power source for a wristwatch and good charge-discharge properties, at a nominal voltage of 1.5 V.

Abstract: A method for manufacturing a lithium secondary cell comprising a positive electrode containing a lithium titanate as an active material, a negative electrode containing a carbonaceous material as an active material, and an electrolytic solution comprising a solution of a lithium salt in an organic solvent.

Abstract: A method for recovering reusable rare earth compounds such as rare earth oxides, rare earth fluorides, or rare earth metals from rare earth alloy scrap in an effective and safe manner. The method includes the steps of: (a) pulverizing rare earth alloy scrap at least by hydrogenating the alloy scrap to obtain pulverized alloy scrap, (b) heating the pulverized alloy scrap to obtain an oxide, (c) contacting the oxide with an acid solution to leach rare earth element into the acid solution in the form of ions, and filtering a resulting solution containing rare earth ions to obtain a filtrate, and (d) forming a precipitate containing rare earth element from the filtrate.

Abstract: Disclosed are (1) an aqueous coating composition which is characterized in that the composition comprises:(A) an acrylic resin-type emulsion,(B) a urethane resin-type emulsion and(C) a crosslinking agentthe component (B) being a self-emulsifiable urethane emulsion prepard by subjecting a urethane prepolymer to reaction for chain extension by water and to emulsification after or during neutralization of the urethane prepolymer with a tertiary amine, the urethane prepolymer consisting essentially of (i) an aliphatic and/or alicyclic diisocyanate, (ii) a polyether diol and/or polyester diol both having a number-average molecular weight of about 500 to about 5000, (iii) a low-molecular weight polyhydroxyl compound and (iv) a dimethylolalkanoic acid in an NCO/OH ratio by equivalent of 1.1-1.9/1; and (2) a two-coat one-bake coating method characterized by use of said aqueous coating composition as the base-coat composition.

Abstract: A bulk polymerization reactor takes the form of a vertical, cylindrical vat of a jacket construction defining a reaction chamber which a rotary drive shaft having an off-center longitudinal section with perforated discs and shearing blades extends vertically through. Successful preclusion of abnormal stagnation of the liquid phase in the reaction chamber during polymerization avoids undesirable coloring in the product while assuring stable polymerization and high yield.