Abstract: Polyurethane resin compositions include a urethane prepolymer with an active hydrogen group and a polyisocyanate, or a urethane prepolymer with an isocyanate group and an active hydrogen compound. The urethane prepolymers having an active hydrogen group or an isocyanate group are obtained by reacting an allophanate group-containing polyisocyanate with a side-chain hydrocarbon group of 5 or more carbon atoms and a bifunctional or polyfunctional active hydrogen compound. Particularly preferably, the allophanate group-containing polyisocyanate is obtained by reacting a C5 or higher carbon number compound having an alcoholic hydroxyl group and an organic diisocyanate, in the presence of an organic bismuth carboxylate and an organic phosphite triester. The polyurethane resin compositions are suited for use as adhesives for bonding low-polarity resin bases such as polyolefin films.

Abstract: In order to provide an alkali-soluble-film surface-lubricated metal product excellent in moldability and long-term stable film-removability independent of the film drying temperature, an alkali-soluble lubricating film mainly comprising an alkali-soluble polyurethane aqueous composition containing a polyether polyol as a skeleton and also containing a carboxyl group within the molecule, and a lubricating function-imparting agent in an amount of 1 to 30 mass % based on the alkali-soluble polyurethane aqueous composition is coated on both surfaces or one surface of a metal to have a film thickness of 0.5 to 10 &mgr;m, thereby constituting an alkali-soluble-film surface-lubricated metal product excellent in moldability and long-term stable film-removability independent of the film drying temperature, wherein the elastic modulus of the film after coating is from 0.5 to 20 GPa at 25° C.

Abstract: A soluble lubricating surface-treated stainless steel sheet with excellent shapability for fuel tanks, comprising a substrate having on both surfaces or one surface thereof a soluble lubricating resin film. Preferably, the soluble lubricating resin film mainly comprises (A) an alkali-soluble polyurethane resin composition containing a carboxyl group or a sulfonic acid group within the molecule and having a glass transition point of 100° C. or more as a dry film and (B) a lubricating function-imparting agent in an amount of from 1 to 30% by mass based on the polyurethane composition.

Abstract: A surface-lubricated metal product, with excellent shapability, comprising a metal having coated on both surfaces, or one surface, thereof an alkali-soluble lubricating film mainly comprising an alkali-soluble polyurethane aqueous composition containing a carboxyl group or a sulfonic acid group within the molecule, and a lubricating function-imparting agent in an amount of 1 to 30 mass % based on the alkali-soluble polyurethane aqueous composition, the film being coated to have a film thickness of 0.5 to 10 &mgr;m and the elastic modulus of the film after coating being 0.5 to 20 GPa at 25° C.

Abstract: A soluble lubricating surface-treated stainless steel sheet with excellent shapability for fuel tanks, comprising a substrate having on both surfaces or one surface thereof a soluble lubricating resin film. Preferably, the soluble lubricating resin film mainly comprises (A) an alkali-soluble polyurethane resin composition containing a carboxyl group or a sulfonic acid group within the molecule and having a glass transition point of 100° C. or more as a dry film and (B) a lubricating function-imparting agent in an amount of from 1 to 30% by mass based on the polyurethane composition.

Abstract: The invention provides a photocurable resin composition which inhibits the deactivation of a bisacylphosphine oxide-series photopolymerization initiator and is useful for coating optical fibers. The photocurable resin composition comprises (A) a polyurethane (meth)acrylate oligomer, (B) an ethylenically unsaturated compound, (C) a bisacylphosphine oxide-series photopolymerization initiator, and (D) a tertiary amine and no tin component. Incorporation of the component (D) inhibits the decomposition and deactivation of the component (C). The component (A) may contain an aliphatic C.sub.14-40 polyol (hydrogenated dimerdiol, 12-hydroxystearyl alcohol) as a polyol component. This resin composition is used for a primary coating of a glass fiber or an indirect coating of an optical fiber through the primary layer, the coating layer being cured by light irradiation to provide an optical fiber coated with the resin composition.

Abstract: In the coating composition for a optical fiber of the present invention, a polyurethane (meth)acrylate oligomer (A), which is based on a urethane prepolymer having an equivalent ratio of NCO group in a polyisocyanate (a) to OH group in a polyol (b) of more than 3.0, is used and the oligomer (A) has a mixing weight ratio of an oligomer (d) having a number average molecular weight of 800 or less to an oligomer (e) having a number average molecular weight of 1,000 or more of 30/70-70/30.The coating composition of this invention has a low viscosity, and therefore, is suitable for a rapid fiber-drawing in a production of an optical fiber. Further, a cured material obtained from the coating composition of the present invention has both a high elastic modulus and a high elongation, which properties are required for a hard material, and has a slight change of elastic modulus with a change of temperature to improve a long-term reliability of an optical fiber.

Abstract: A polyether polyol produced by using an N-amino-ethylpiperazine-ethylene oxide aduct as an initiator and addition-polymerizing an alkylene oxide thereto and having a molecular weight of about 2000 to 7000; a process for producing a flexible urethane foam starting with the above polyether polyol; a process suited for the production of a hot-cure urethane foam which comprises using the above polyether polyol with a hydroxyl value of 40 to 80 mg KOH/g and, as a blowing agent, 4.6 to 6.0 weight parts of water based on 100 weight parts of the polyol; and a process suited for the production of a cold-cure urethane foam which comprises using the above polyether polyol with a hydroxyl value of 23 to 50 mg KOH/g and, as a blowing agent, 2.5 to 5.0 weight parts of water on the same basis.

Abstract: A polyether polyol produced by using an N-aminoethylpiperazine-ethylene oxide aduct as an initiator and addition-polymerizing an alkylene oxide thereto and having a molecular weight of about 2000 to 7000; a process for producing a flexible urethane foam starting with the above polyether polyol; a process suited for the production of a hot-cure urethane foam which comprises using the above polyether polyol with a hydroxyl value of 40 to 80 mg KOH/g and, as a blowing agent, 4.6 to 6.0 weight parts of water based on 100 weight parts of the polyol; and a process suited for the production of a cold-cure urethane foam which comprises using the above polyether polyol with a hydroxyl value of 23 to 50 mg KOH/g and, as a blowing agent, 2.5 to 5.0 weight parts of water on the same basis.

Abstract: An effective method for purifying plutonium hexafluoride for the reprocessing of the spent nuclear fuel or for the recovery of fuel plutonium from the scrap by fluoride-volatility with high decontamination factors is presented using a selective adsorption of the fission products fluorides by letting the gas mixture flow through a layer of an adsorbent consisting of one or more of the specified compounds selected from hexafluoro sodium aluminate, zinc fluoride, nickel fluoride and ferric fluoride at an elevated temperature. The principle of the purification method is based on the fact that the fluorides of the fission products are easily adsorbed by the adsorbent but little plutonium hexafluoride is adsorbed. The fluorides of the fission products are easily removed from the adsorbent by heating and the recycling use of the adsorbent is possible.