Abstract: Disclosed is a coloring material including a rubber having a sulfonic acid group or a salt thereof, which is dyed with a basic dye. The coloring material is prepared by adding a solution of an alkali in an alcohol to a solution of a chlorosulfonated polyolefin in an organic solvent and then adding a basic dye to the obtained reaction liquid, or adding a basic dye to a solution of a sulfonated product of a rubber in an organic solvent, and optionally removing the solvent from the obtained solution.

Abstract: A halogen-containing polyacrylate derivative having the formula: ##STR1## wherein A is a structural unit derived from a copolymerizable monomer having a double bond; R is ##STR2## wherein each of R.sub.1 and R.sub.2 is a hydrogen atom or a fluorinated methyl group, provided R.sub.1 and R.sub.2 are not hydrogen atoms at the same time, and R.sub.3 is a hydrogen atom or a lower alkyl group; X is a halogen atom or a methyl group; and m is a positive integer, n is 0 or a positive integer, and n/m is from 0 to 2, preferably from 0 to 1.

Abstract: Bromine is advantageously recovered from a free bromine-containing aqueous solution or gas by placing the solution or gas in contact with an adsorbent comprising a ZSM-5 zeolite having an SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of at least 70 and heating the adsorbent at a temperature of at least 60.degree. C.

Abstract: A hydroxyacetic acid amide derivative having the formula: ##STR1## wherein each of R and R.sub.1 which may be the same or different, is an alkyl, alkenyl, alkynyl or alkoxyalkyl group having from 1 to 4 carbon atoms, provided that R and R.sub.1 are not simultaneously alkyl groups.

Abstract: Hydrogen ion-exchanged dealuminated mordenite having a reduced alumina content is advantageously prepared by filtering a crystallization slurry composed of a crystallization mother liquor and synthetic sodium type mordenite and obtained when the crystallization is completed, through a filter to form a wet cake layer of the sodium type mordenite; passing through the cake layer an aqueous solution of a mineral acid having a concentration of 0.1N to 5N; and then, washing the cake layer.

Abstract: A process for the gas phase homopolymerization of vinyl chloride or the gas phase copolymerization of vinyl chloride with a monomer copolymerizable therewith, wherein when the breeding ratio first exceeds 3.5 after initiation of the polymerization, the feed rate of a seed polymer is adjusted so that the breeding ratio is maintained at a level of from 3.5 to 5.5.

Abstract: Disclosed is a wipe-erasable ink composition for a writing board, which has good erasability and long-period stability. This ink composition comprises a colored polymer formed by dyeing an organic solvent-soluble resin having a sulfonic acid group or a salt thereof with a basic dye, a volatile organic solvent and, as additives, (A) a nonionic surface active agent having an HLB value of 8 to 14 and/or a cationic organic compound, and (B) a slightly volatile or nonvolatile organic compound.

Abstract: Organic pigments are prepared by dissolving at least one organic pigment in a non-protonic polar solvent in the presence of a caustic alkali and water, and adding to the solution an acid having an acrylic resin dissolved therein to effect neutralization and reprecipitation.

Abstract: Process for producing condensed bromoacenaphthylene comprising:(A) a step of brominating and condensating acenaphthene with bromine in a halogenated hydrocarbon solvent in the presence of a Lewis acid catalyst;(B) a step of removing the Lewis acid catalyst and then continuing the bromination with bromine with an added radical initiator; and(C) a step of carrying out dehydrobromination reaction.In a modified process, the bromination is effected in a halogenated hydrocarbon solvent at a temperature not lower than 60.degree. C. using bromine at least 3 times as much in moles as acenaphthene in the presence of an iron catalyst.Further, the condensed bromoacenaphthylene is purified by bringing it into contact with an adsorbent in an organic solvent.

Abstract: A stirrer for biochemical reactions comprising a magnetically permeable vessel for containing a solution of biochemically reacting substances, at least one magnetic bead placed in the vessel, and a magnetic device which is installed outside the vessel and generates an oscillating magnetic field acting on the bead. The stirrer is advantageous for stirring the solution of biochemically reacting substances for biochemical reactions without direct contact.

Abstract: In chromatographic analysis by the steps of adding a sample solution to a flow of an eluant, passing the eluant flow through a separation column thereby converting the eluant flow into an eluate flow containing component ions of the eluant flow in separate zones, passing the eluate flow through an ion-exchange membrane tube thereby allowing the eluate to come into contact with an aqueous solution of an H.sup.+ form or OH.sup.- form electrolyte outside the tube through the wall of the membrane tube, substituting those of the component ions contained in the eluate flow which have the same type of electric charge as H.sup.+ or OH.sup.- with said H.sup.+ or OH.sup.- thereby giving rise to a deionized solution flow, and passing the deionized solution flow through a detection cell thereby causing the component ions which have survived the substitution to be detected as separated into distinct zones, improvements are obtained by causing the aqueous solutions of H.sup.+ or OH.sup.

Abstract: In chromatographic analysis by the steps of adding a sample solution to a flow of an eluant, passing the eluant flow through a separation column thereby converting the eluant flow into an eluate flow containing component ions of the eluant flow in separate zones, passing the eluate flow through an ion-exchange membrane tube thereby allowing the eluate to come into contact with an aqueous solution of an H.sup.+ form or OH.sup.- form electrolyte outside the tube through the wall of the membrane tube, substituting those of the component ions contained in the eluate flow which have the same type of electric charge as H.sup.+ or OH.sup.- with said H.sup.+ or OH.sup.- thereby giving rise to a deionized solution flow, and passing the deionized solution flow through a detection cell thereby causing the component ions which have survived the substitution to be detected as separated into distinct zones, improvements are obtained by causing the aqueous solution of H.sup.+ or OH.sup.

Abstract: A process for producing niobium metal of an ultrahigh purity, which comprises iodizing niobium metal or niobium chloride containing at least tantalum as an impurity, thermally reducing the iodized product, and then thermally decomposing the reduced product.

Abstract: A high .alpha.-type silicon nitride powder is prepared by thermally decomposing a mixture of a crystalline silicon nitride powder having an oxygen content of at least 1.0% by weight and a nitrogen-containing silane compound.

Abstract: A coloring material comprising a solution of an alcohol-soluble resin having a sulfonic acid group or a salt thereof, which is dyed with a basic dye, in a solvent comprising an alcohol as a main component. The coloring material is prepared either by (a) polymerizing an ethylenically unsaturated sulfonic acid or a salt thereof in water and adding a basic dye to the obtained aqueous liquid of the formed polymer or (b) carrying out said polymerization in the presence of a basic dye, and dissolving (i) the obtained aqueous liquid of the formed colored polymer of (ii) a colored polymer obtained by removing water from the obtained aqueous liquid of the formed colored polymer in a solvent comprising an alcohol as a main component; or, (a') carrying out said polymerization in a solvent comprising an alcohol as a main component and then adding a basic dye to the obtained polymer solution, or (b') carrying out said polymerization in the presence of a basic dye.

Abstract: A method for separating an acid and an alkali from an aqueous solution of a salt by an ion exchange membrane electrolysis wherein anion and cation exchange membranes are used as diaphragms and wherein the acid is formed in an anode compartment, and the alkali is formed in a cathode compartment, characterized in that the cation exchange membrane is a fluorinated cation exchange membrane and the anion exchange membrane is a fluorinated anion exchange membrane with the ion exchange capacity varied from one side to the other side.

Abstract: A method for fluorometric analysis of catecholamines characterized in that, after the addition of a catecholamine into a solution of 1,2-diphenylethylenediamine containing an oxidizing reagent at a pH of 4 to 10, the mixture is allowed to stand for more than 1 minute at a temperature of higher than 15.degree. C. to make cateocholamine fluorescent, is disclosed.

Abstract: A process for producing DL-phenylalanine by reacting an .alpha.-halogeno-.beta.-phenylpropionic acid represented by the general formula: ##STR1## where X is a halogen atom, or its salt, with ammonia, characterized in that the reaction is conducted while supplying the .alpha.-halogeno-.beta.-phenylpropionic acid or its salt into aqueous ammonia charged in a reactor in advance.

Abstract: Amine catalysts useful for producing polyurethane foams coated with skin by reaction of an organic polyisocyanate with a polyol. The catalysts comprise 4-methyl-1-(2-hydroxyalkyl)-piperazine, and emit no bad odor, give excellent moldability and are free from deterioration of skin and discoloration of covering materials.

Abstract: Phenyl chlorothioformates are produced in high yields easily and safely by (1) allowing sulfur dioxide to react with a mixed solution consisting of perchloromethyl mercaptan, an organic solvent and water, (2) removing the aqueous layer from the reaction mixture and (3) adding to the organic layer a phenol compound and a dehydrohalogenating agent in that order.