Abstract: A process for producing a propylene block copolymer in the presence of a highly stereospecific olefin polymerization catalyst which comprises producing a crystalline polymer or copolymer of propylene in a first stage and random-copolymerizing propylene and another alpha-olefin in a mole ratio of from 10:90 to 90:10 in the presence of the propylene polymer or copolymer in a second stage; wherein in the random copolymerization, 0.0001 to 0.5 mole, per gram atom of aluminum in the catalyst, of an oxygen-containing compound being gaseous in a standard condition or 0.001 to 1 mole, per gram atom of aluminum in the catalyst, of an active hydrogen-containing compound being liquid or solid in a standard condition is fed into the random-copolymerization reaction system.

Abstract: Disclosed herein is a novel benzoquinone derivative represented by the following general formula (I): ##STR1## wherein R.sub.1 means an alkyl or cycloalkyl group, R.sub.2 denotes an alkyl or cycloalkyl group, a phenyl group which may optionally contain one or more halogen atoms and/or alkyl, cycloalkyl, alkoxy, alkylene, phenoxy, phenyl and/or biphenylyl groups, or a benzyl or naphthyl group which may optionally contain one or more methyl groups. This compound is useful as an oxidative color-developing agent for recording materials.

Abstract: A method for installing an offshore jack-up structure having a buoyant platform to be towed and a plurality of legs, the method comprising the steps of:(a) providing a pair of ultrasonic transmitter-receivers on a longitudinal and horizontal center line of the platform,(b) providing of ultrasonic transmitters on a longitudinal and horizontal center line of a target structure to which the rig is approached; and(c) receiving signals transmitted from the ultrasonic transmitters of the target structure by the ultrasonic transmitter-receivers of the platform to determine a relative distance between the rig and the target structure.

Abstract: This invention uses a zinc alloy containing In, one element of Al or Mg and, optionally, one or both of Pb and Cd for the anode of a zinc-alkaline battery which employs zinc as an active material of the anode (2), aqueous alkaline solution as an electrolyte, and manganese dioxide, silver oxide, oxygen and so forth as an active material of the cathode (5). The use of such zinc alloy permits the reduction of the amount to be used of mercury employed for amalgation of the anode zinc surface with the object of corrosion inhibition, thereby enabling the provision of a low pollution zinc-alkaline battery.

Abstract: A flame-retardant styrene-base resin composition is composed of 100 parts by weight of a styrene-base resin, 2.0-20.0 parts by weight of a halogenous flame retardant and 0.1-5.0 parts by weight of an antimony compound. The weight ratio of halogen atoms/antimony atoms in the resin composition is 5 or greater. The resin composition of this invention has well-balanced specific gravity, impact resistance and heat resistance and flame retardancy.

Abstract: Disclosed herein is a process for preparing heat-resistant polymers by reacting an organic polyisocyanate with one or more compounds selected from the group consisting of organic polycarboxylic acids and organic polycarboxylic acid anhydrides in the presence of an alkali metal fluoride or an alkali metal fluoride combined with a quaternary onium salt as a catalyst.

Abstract: A polypropylene-base resin composition comprising a polypropylene-base resin and carbon black in an amount of 0.01-0.6 wt. % based on the polypropylene-base resin and being suitable for use in the production of molded articles having excellent paintability.

Abstract: Disclosed herein is an antihypertensive preparation containing, as an active component, a novel quinazoline derivative represented by the following general formula or a salt thereof: ##STR1## wherein R.sup.100 means a hydrogen atom or methoxy group, R.sup.200 and R.sup.300 denote individually a hydrogen atom or lower alkoxy group, R.sup.400 is a hydrogen atom or amino group, l stands for 2 or 3, and Het is a specific hetero ring group.

Abstract: Provided are novel dichroic azo dyestuffs, which contain skeletons represented by the following general formula: ##STR1## at one terminals of the long axes of the molecules of the azo dyestuffs, and liquid crystal compositions containing the dichroic azo dyestuffs in forms dissolved in liquid crystals. These dichroic azo dyestuffs have large dichroic ratios and high durability, and their compositions are employed as useful display devices.

Abstract: This invention relates to a novel polyimide and describes the method of its preparation, adhesives of the polyimide and the method for their application.The polyimide has recurring units of the formula ##STR1## (where Y is ##STR2## and R is a tetra-valent radical selected from the group consisting of aliphatic radicals having not less than two carbons, cyclo-aliphatic radical, monoaromatic radical, condensed polyaromatic radical, and non condensed polyaromatic radical wherein aromatic radicals are mutually connected with a bond or a crosslinking function).

Abstract: Hydrochloric acid is added to a solution containing L-cysteine, L-cystine, L-serine and an inorganic salt until it contains at least 15% by weight of hydrochloric acid. The solution is held at a temperature of at least 20.degree. C. so that the L-cystine and the inorganic salt may form a solid, and the solid is removed from the solution. The solution is cooled to a temperature not exceeding 10.degree. C., so that crystallization may take place to form the monohydrate of L-cysteine hydrochloride. The monohydrate is separated from the L-serine in the solution.

Abstract: Disclosed is a method for separating lycine and L-serine from a solution containing both of them in the dissolved state and, in particular, a reaction solution obtained from a fermentation or enzymic conversion process for the preparation of L-serine by using glycine as the raw material. This method is based on a chromatographic technique utilizing the differential affinity of L-serine and glycine for a strongly acidic ion exchange resin.

Abstract: In an industrial process for preparing indole by reacting aniline and ethylene glycol, high boiling-point impurities and non-volatile substances are removed in advance from the reaction mixture either before the recovery of aniline from the reaction mixture or before the subsequent rectification of the resultant indole. Indole of a high purity can thus be obtained.

Abstract: A thermoplastic resin composition having excellent transparency and a high ultraviolet transmittance and free from a reddish color is obtained from a polymer or copolymer of 4-methyl-1-pentene and a blue pigment. Preferably, the composition further comprises a black pigment and/or a red pigment.

Abstract: An improved process of producing 1, 3-dialkyl-2-imidazolidinones directly from N, N'-dialkylethylenediamine and urea with a high yield is provided, which process comprises reacting a N, N'-dialkylethylenediamine of the formula ##STR1## wherein R represents --CH.sub.3, --C.sub.2 H.sub.5, --C.sub.3 H.sub.7 or --C.sub.4 H.sub.9, with urea at 180.degree. C. or higher in the presence of a polar solvent, to obtain a 1, 3-dialkyl-2-imidazolidinone of the formula ##STR2## and preferably comprises carrying out the reaction at two stages, that is, the initial period reaction being carried out at 140.degree. C. or lower to from a 1, 1'-dialkyl-1 1'-dimethylenebisurea and successively the latter reaction being carried out at 180.degree. C. or higher.

Abstract: A process for producing a sialon powder, which process comprises the steps of:introducing a decomposable silicon compound, decomposable aluminum compound and a decomposable carbon compound into a steam-containing hot gas to decompose said decomposable silicon compound, aluminum compound and carbon compound in said hot gas into silicon oxide, aluminum oxide and elemental carbon, respectively, thereby producing a fine solid particle mixture consisting essentially of said silicon oxide, aluminum oxide and elemental carbon to be dispersed in said gas;collecting said fine solid particle mixture dispersed in the gas from the gas phase by a solid-gas separating technique; andcalcining the thus-obtained carbon-containing composition consisting essentially of said silicon oxide, aluminum oxide and elemental carbon, in a nitrogen containing gas atmosphere.

Abstract: An aromatic copolyester comprising substantially equimolar proportions of [A] units derived from an aromatic dicarboxylic acid having 8 to 16 carbon atoms, and [B] units derived from an aromatic diol component; characterized in that(I) the diol component [B] is composed of 20 to 95 mole %, based on the total moles of compounds (a) and (b) below, of(a) a bisphenol compound represented by the formula ##STR1## wherein X represents a direct bond, or a divalent group selected from the class consisting of C.sub.1 -C.sub.8 alkylidene groups, O, S, SO, SO.sub.2 and CO, and(b) 5 to 80 mole %, based on the total moles of the compounds (a) and (b), of a compound selected from the group consisting of a specific divalent phenolic compound, and(II) the aromatic copolyester has an intrinsic viscosity [.eta.], determined at 60.degree. C. in pentafluorophenol, of at least 0.4 dl/g.

Abstract: Polymer powder is separated from a carrier gas by separating the polymer powder from the carrier gas in a cyclone separator, drawing the thus-separated polymer powder through a bottom part of the separator into a hopper, feeding out the polymer powder by a rotary feeder from the hopper while controlling the revolution speed of the rotary feeder in accordance with the powder level in the hopper, and controlling the volume of a purge gas, which is introduced into a polymer powder guide extending between the separator and the hopper for the prevention of plugging thereof, in accordance with the revolution speed of the rotary feeder. The height of the top of the powder in the hopper is maintained at a predetermined constant level.

Abstract: A method of producing an alloy containing at least one major ingredient selected from the group consisting of iron (Fe), cobalt (Co), and Nickel (Ni) and having low contents of sulphur, oxygen, and nitrogen, comprises steps of:(a) holding a molten alloy in a container selected from the group consisting of a lime crucible, a lime crucible furnace, a converter and a ladle lined with a basic refractory consisting of 15-85% of calcium oxide (CaO), and 15-75% of magnesium oxide (MgO), wherein said alloy consists essentially of at least one major ingredient selected from the group consisting of iron (Fe), nickel (Ni), and cobalt (Co);(b) adding at least one additive, based on the molten alloy, into said molten alloy in an atmosphere selected from the group consisting of a non-oxidizing atmosphere and a vacuum, wherein said additive is selected from the group consisting of aluminum (Al), aluminum alloys, silicon and silicon alloys;(c) desulphurizing, deoxidizing and denitrifying said molten alloy under an atmosphere

Abstract: This invention relates to a temperature control indicator unit comprising a substrate having supported thereon (a) microcapsules enclosing a hydrophobic organic compound possessing an arbitrarily selected melting point, (b) a methine dye and (c) an oxidizing material. More particularly, a unit made by combining an irreversibly color-developing methine dye and an oxidizing material with microcapsules enclosing a hydrophobic organic compound possessing a predetermined melting point and supporting them on a substrate is used for temperature control purposes. A suitable measure is taken, preferably at or below the desired control temperature, to break at least a part of the microcapsules of the unit and thereby produce fissures or the like in the microcapsule membrane. Then, the unit is stored or transported together with an article to be placed under temperature control.