Abstract: Disclosed herein is a process for producing a polyamide comprising polymerizing at least one monomer of polyamide in the presence of(1) a hydrocarbon polymer having at least one group selected from the group consisting of a carboxyl group, a derivative group of carboxylic acid, an amino group, and a hydroxyl group, or(2) a polymer produced by reacting the hydrocarbon polymer with a polyamide, or polymerizing at least one monomer of polyamide in the presence of the hydrocarbon polymer.

Abstract: In accordance with this invention an aqueous solution of a water-soluble dye containing lithium sulfonate group or ammonium sulfonate group can be obtained by a very simple and economical process in such a way that an aqueous solution of a water-soluble dye containing sodium sulfonate group is fed to a packed column packed with acid type cation exchange resin (H-form) to form an aqueous solution of a dye containing a free sulfonic acid group, and after neutralizing the resulting solution with LiOH or NH.sub.4 OH, the aqueous solution of the dye thus obtained is concentrated according to a process for separation through reverse osmotic membrane.

Abstract: High-quality coloring carbon black having a specific surface area (S.sub.BET), an area average diameter (D.sub.a) and a pore volume (AV.sub.Hg) which make both the roughness factor (RF) and aggregate factor (AF) as calculated by the following equations, negative values:RF=S.sub.BET -28710/(D.sub.a)+1450AF=AV.sub.Hg +14.times.(D.sub.a)-290where S.sub.BET is the specific surface area (m.sup.2 /g) of the carbon black as measured by a BET nitrogen absorption method, D.sub.a is the area average diameter (m.mu.m) of the carbon black as measured by an electron microscopic measuring method, and AV.sub.Hg is the pore volume (cc/100 g) of the carbon black as measured by a mercury porosimeter, provided D.sub.a is at most 17 m.mu.m.

Abstract: Disclosed herein is a vinylamine copolymer having the structural units represented by the general formulae (I), (II) and (III): ##STR1## (wherein X represents an anion or hydroxyl ion) ##STR2## (wherein R.sup.1 represents hydrogen atom or a methyl group, R.sup.2 represents hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and R.sup.3 represents an alkyl group having 1 to 4 carbon atoms or an oxoalkyl group having 4 to 8 carbon atoms) in which the molar fraction of the structural unit (I) is 5 to 85% by mole, the molar fraction of the structural unit (II) is 5 to 85% by mole, and the molar fraction of the structural unit (III) is 90 to 5% by mole, a flocculating agent, a drainage aid and a paper strength increasing agent using such vinylamine copolymer, and a process for producing such vinylamine copolymer.

Abstract: A method for producing an .alpha.-olefin block copolymer, which comprises polymerizing propylene alone or together with a small amount of other .alpha.-olefin in the presence of a catalyst comprising a titanium-containing solid catalyst component and an organoaluminum compound, and then polymerizing the resulting propylene polymer with an .alpha.-olefin other than propylene, alone or together with propylene in a gas phase without deactivating the catalyst, characterized in that the gas phase polymerization is conducted in the presence of a siloxane or a polysiloxane in an amount of from 1.times.10.sup.-6 to 0.1 by weight ratio relative to the weight of said propylene polymer.

Abstract: Disclosed herein is a polyamide resin composition comprising a polyamide resin, from 0.1 to 1% by weight of fine silica based on the polyamide resin and from 1 to 99% by weight of a silane coupling agent based on the fine silica. The packaging material obtained from the polyamide resin composition of the present invention has uniform and satisfactory transparency and is excellent in the blocking resistance.

Abstract: An electrolytic solution for Karl Fischer's coulometric titation and a method for measuring the water content of a sample using the same are disclosed. The electrolytic solution contains iodine or an iodide, sulfur dioxide, an amine and a solvent, wherein the amine is a pyridine derivative, imidazole or an imidazole derivative and the solvent is a mixture of (a) a polyhydric alcohol or an ether compound thereof, (b) methanol and (c) a halogenated hydrocarbon or an aromatic hydrocarbon. The measurement method achieves a high precision with reduced measurement time and is suitable for making water content measurements using a water content vaporization method.

Abstract: Disazo dyes for dyeing cellulose-containing fibers represented by the following general formula: ##STR1## wherein R.sup.1 and R.sup.2 each represents a hydrogen atom, a halogen atom, a nitro group, a cyano group, a thiocyanato group, a trifluoromethyl group, a formyl group, a lower alkoxycarbonyl group, a lower alkylsulfonyl group, a sulfamoyl group, an N-lower alkylsulfamoyl group or an N,N-di-lower alkylsulfamoyl group, R.sup.3 represents a hydrogen atom, a methyl group, a chlorine atom, a lower alkoxy group or an acylamino group, R.sup.4 represents a hydrogen atom, a methyl group, a chlorine atom or a lower alkoxy group, R.sup.5 represents a hydrogen atom, a lower alkyl group or a halogen atom, --X-- represents ##STR2## --SO.sub.2 -- or --CH.sub.2 --, and n represents 0 or 1. These dyes are capable of dyeing cellulose-containing fibers, particularly fiber blends composed of cellulose fibers and polyester fibers, blue to bluish green with good fastness properties.

Abstract: A moldable resin composition comprising (1) a saponified ethylene/vinyl acetate copolymer having an ethylene content ranging from 20 to 80 mole % and a saponification degree of not less than 90%, and a polyamide resin containing terminal carboxyl (--COOH) and terminal amide (--CONRR') groups, wherein the number (A) of the terminal carboxyl groups and the number (B) of terminal amide groups satisfies the relationship: ##EQU1## wherein (R) is a hydrocarbyl group of 1 to 22 carbon atoms and R' is a hydrogen atom or a hydrocarbyl group of 1 to 22 carbon atoms.

Abstract: A method of separating 2,6-dimethylnaphthalene from a feed material containing a mixture of dimethylnaphthalene isomers comprises the steps of:adsorption separation using an adsorbent of a zeolite Y containing alkali metal or zinc and a desorbent of an organic solvent mainly composed of paraxylene and/or orthoxylene to obtain a solution consisting of the desorbent and the feed material containing 2,6-dimethylnaphthalene at a concentration of at least 60 wt % on the feed material other than desorbent; andcrystallization of the solution having a concentration of the desorbent at 30 to 90 wt % to obtain 2,6-dimehtylnaphthalene of high purity in a crystalline form.

Abstract: A method for manufacturing a concrete structure such as columns and beams with sufficient reinforcement in the shear strength to be durable against earthquakes, etc. A reinforcing member composed of a fiber-reinforced plastic is applied onto the outer periphery of a concrete structural member by winding the fiber strands around the outer periphery of the concrete structural member while impregnating the fiber material with a resin.

Abstract: Disclosed herein are a coagulant for minute mineral particles in suspension, comprising a copolymer of 0.5 to 10 mol % of 2-acrylamido-2-methylpropanesulfonic acid or a salt thereof, 40 to 99.5 mol % of N-hydroxymethylacrylamide and 0 to 59.5 mol % of acrylamide and showing a reduced viscosity of 10 to 30 dl/g in an aqueous 1N solution of sodium chloride at a temperature of 25.degree. C. and a concentration of the copolymer of 0.1 g/dl therein, and a method for coagulating the minute mineral particles in a suspension, comprising adding the coagulant a neutral waste water.

Abstract: Disclosed herein is a water-soluble polymer composition, and more in detail, a composition of a polymer or a copolymer of acrylamide having an improved thermal stability.

Abstract: A process for producing a copolymeric polyester, which comprises a first step of preparing a copolymeric oligomer by reacting a starting material oligoester or polyester having repeating units of the formula: ##STR1## wherein R.sub.1 is a divalent aromatic hydrocarbon group having from 6 to 10 carbon atoms, a divalent alicyclic hydrocarbon group having from 4 to 20 carbon atoms or/and a divalent aliphatic hydrocarbon group having from 1 to 40 carbon atoms (provided a hydrogen atom in the aromatic ring of the aromatic hydrocarbon group may be substituted by a halogen atom or an alkyl or alkoxy group having from 1 to 4 carbon atoms), and R.sup.

Abstract: The dye transfer type thermal printing sheet and method for printing of this invention are a printing sheet comprising a transfer sheet in which a smooth heat-resistant layer composed of fine particles, a liquid lubricating material and a polymer is formed on one side of a substrate, and on the other side is formed a coloring material layer containing at least one sublimable dye, non-sublimable particles and a binder, a part of said non-sublimable particles jutting out from the reference surface of the sublimable dye layer; and an image-receiving sheet having, on a substrate for image-receiving sheet, a development layer composed of, at least, inorganic fine particles; a binder having dye-affinity and another binder immiscible with said binder; and a dye transfer type thermal method for printing which comprises placing the aforesaid coloring material layer and development layer of the above-mentioned printing sheet face to face with each other, heating the printing sheet selectively from the smooth heat-resis

Abstract: A method for hydrogenating an aldehyde and/or a ketone in the presence of a ruthenium catalyst, wherein said ruthenium catalyst is obtained by reducing an alkali metal ruthenate with a reducing agent selected from the group consisting of methanol, formaldehyde and formic acid.

Abstract: A process for producing a polycarbonate resin having a viscosity-average molecular weight of from 9,000 to 50,000 by reacting at least one bisphenol compound with phosgene or a carbonate, characterized in that a phenol compound having the formula: ##STR1## wherein R is an alkyl group having from 5 to 7 carbon atoms, and R is located at the ortho- or para-position relative to the OH group, is used as a molecular weight modifier.

Abstract: A process for preparing a water repellent calcium silicate shaped product, which comprises dispersing a siliceous source and a calcareous source in water, mixing a water repellent composition thereto, reacting the mixture under heating to obtain an aqueous slurry containing a calcium silicate hydrate, pressfilter-molding the aqueous slurry, followed by drying or drying after steam-curing.

Abstract: Disclosed herein is a process for producing highly pure terephthalic acid which forms polyesters of a particularly favorable color tone, the process comprising the steps ofoxidizing p-xylene, thereby obtaining a mixture containing terephthalic acid,subsequently further oxidizing the thus obtained mixture at not higher temperature than that of the first oxidation step,still further oxidizing the reaction mixture of the second oxidation step at a higher temperature than that of the first oxidation step andtreating the reaction mixture obtained by the third step of oxidation by bringing thereof into contact with molecular oxygen.

Abstract: An optical recording member for performing recording and reproduction of information by causing changes in the state thereof with a laser beam, which optical recording member comprises a base plate and a recording layer provided on the base plate and containing therein a phthalocyanine type compound and/or naphthalocyanine type compound represented by the following general formula: ##STR1## (where: R.sup.1 to R.sup.4 represent substituted and/or unsubstituted alkyl group, alkoxyalkyl group, aryl group, and so forth; and A denotes Pb, Sn, Cu, Ni, VO, and so on).