Abstract: A crystalline polyesterpolyol having a number average molecular weight of 1,500 to 15,000 and obtainable from a polybasic carboxylic acid component and an aliphatic hydrocarbon diol component comprising 1,10-decanediol and/or 1,12-dodecanediol, and a hot-melt adhesive comprising a reaction product of a polyisocyanate and a polyesterpolyol, which contains a crystalline polyesterpolyol having a number average molecular weight of 1,500 to 15,000 and obtainable from a polybasic carboxylic acid component and an aliphatic hydrocarbon diol component comprising 1,10-decanediol and/or 1,12-dodecanediol are provided.

Abstract: A crystalline polyesterpolyol having a number average molecular weight of 1,500 to 15,000 and obtainable from a polybasic carboxylic acid component and an aliphatic hydrocarbon diol component comprising 1,10-decanediol and/or 1,12-dodecanediol, and a hot-melt adhesive comprising a reaction product of a polyisocyanate and a polyesterpolyol, which contains a crystalline polyesterpolyol having a number average molecular weight of 1,500 to 15,000 and obtainable from a polybasic carboxylic acid component and an aliphatic hydrocarbon diol component comprising 1,10-decanediol and/or 1,12-dodecanediol are provided.

Abstract: A cyanurate compound having three oxetane ring groups and represented by the general formula (1): wherein R1 represents a member selected from the group consisting of a hydrogen atom and alkyl groups having 1 to 6 carbon atoms, is useful as a photosetting monomer or thermosetting monomer, and thus is used, together with a hardening agent, for example, a polycarboxylic anhydride and a catalyst, for example, an amine, a carboxylic acid metal salt or a protonic acid, to provide an organic hardening composition usable for producing electronic materials, for example, resists.

Abstract: A bis(methoxymethyl)biphenyl having the formula (I): ##STR1## which is capable of producing by a dehalogenating coupling of a halogenated methoxymethylbenzene and which is useful as an intermediate for a phenol novolak condensate, an epoxy resin curing agent, an epoxy resin composition, or a phenol resin composition.

Abstract: A bis(methoxymethyl)biphenyl having the formula (I): ##STR1## which is capable of producing by a dehalogenating coupling of a halogenated methoxymethylbenzene and which is useful as an intermediate for a phenol novolak condensate, an epoxy resin curing agent, an epoxy resin composition, or a phenol resin composition.

Abstract: There are disclosed a process for preparing 2-hydroxy-2-(6-methoxy-2-naphthyl)propionic acid or 2-hydroxy-(4-substituted phenyl)propionic acid derivative which comprises reacting 2-methoxynaphthalene or substituted benzene derivatives with pyruvic acid in the presence of a Lewis acid and then, if necessary, hydrolyzing the obtained product, and a process for preparing 2-(6-methoxy-2-naphthyl)propionic acid or 2-(4-substituted phenyl)propionic acid derivative which comprises reducing 2-hydroxy-2-(6-methoxy-2-naphthyl)propionic acid or 2-hydroxy-2-(4-substituted phenyl)propionic acid derivative in a lower aliphatic acid in the presence of an inorganic acid under hydrogen atmosphere by using a metal catalyst.

Abstract: A liquid thermal accumulator composition comprising a dicarboxylic acid anhydride, an alcohol and a monoester of the dicarboxylic acid and the alcohol. A process for accumulation of thermal energy utilizing said composition is also disclosed.

Abstract: In a process for producing an iodo-aromatic compound which comprises iodinating an aromatic compound having an electron-donating substituent bonded to the benzene ring with iodine in the presence of a solvent, the improvement wherein about 1/2 to about 10 moles, per mole of iodine added to the reaction system, of nitrogen dioxide (NO.sub.2) is added in the form of NO.sub.2 to the reaction system, and the reaction is carried out in the presence of nitrogen dioxide.

Abstract: Disclosed is an improved process for preparing diesters of malonic acid by subjecting ketene, carbon monoxide and an ester of nitrous acid to a liquid phase reaction in an organic solvent, in which the reaction is carried out in the presence of a catalyst of a platinum group metal complex represented by the formula:L.sub.2 MX.sub.2wherein, L represents a ligand selected from the group consisting of triorganophosphines, triorganophosphite and triorganoarsines; M represents a platinum group metal; and X represents a halogen or an acetic acid ion.

Abstract: A polyimide solution is prepared by a process wherein a tetracarboxylic acid ingredient containing at least about 80% by mole of 3,3',4,4'-biphenyltetracarboxylic acid or its functional derivative and an aromatic diamine ingredient containing at least about 50% by mole of 4,4'-diaminodiphenyl ether are polymerized at from about 100.degree. to 300.degree. C. in phenol or a halogenated phenolic compound; the amount of the acid and diamine ingredients being approximately equimolar to each other; whereby polymerization of the tetracarboxylic acid ingredient and the aromatic diamine ingredient is effected while being accompanied by imidation. Preferably, the polymerization accompanied by imidation is effected in a manner such that at least a second half of the polymerization is carried out in a closed reaction system. The resulting polyimide solution is suitable for making therefrom shaped articles, such as films, possessing excellent mechanical properties.

Abstract: An aromatic polyimide resin composition useful for producing a film or sheet, comprises 2% by weight or more of an imide polymer having at least 90 molar % of a recurring unit of the formula (I): ##STR1## wherein R' is a divalent aromatic radical, and dissolved in an organic polar solvent consisting essentially of one or more halogenated phenol compounds of the formulae (II) or (III): ##STR2## wherein R.sup.2 is a hydrogen atom of a C.sub.1-3 alkyl radical and is a halogen atom, the halogenated phenol compound having a melting point of 100.degree. C. or less and a boiling point of 300.degree. C. or less.

Abstract: Disclosed is an epoxy resin composition containing, as an essential curing component, 2,3,3',4'-biphenyltetracarboxylic dianhydride which is highly compatible with epoxy resins at a relatively low temperature and effective for producing cured epoxy resins having an excellent thermal resistance.

Abstract: A process for separating and purifying biphenyltetracarboxylic dianhydride isomers from a mixture of these isomers by fractional crystallization in aliphatic acid anhydrides or acetone. The isomeric mixture is obtained by heating biphenyltetracarboxylic acids, optionally in the presence of an aliphatic acid anhydride. The biphenyltetracarboxylic acids are obtained by oxidizing coupling dimers of o-xylene or by hydrolyzing coupling dimers of dimethyl phthalate. 2,3,3',4'-biphenyltetracarboxylic acid dianhydride which can be isolated from the above mixture can be used to form polyimide.

Abstract: A process for preparing substituted dibenzofuran or fluorenone-9 by the intramolecular cyclization of substituted diphenyl ether or benzophenone in the presence of a carboxylic acid salt of palladium and/or palladium organic complex.

Abstract: A process for separating and purifying biphenyltetracarboxylic dianhdride isomers from a mixture of these isomers by fractional crystallization in aliphatic acid anhydrides or acetone. The isomeric mixture is obtained by heating biphenyltetracarboxylic acids, optionally in the presence of an aliphatic acid anhydride. The biphenyltetracarboxylic acids are obtained by oxidizing coupling dimers of o-xylene or by hydrolyzing coupling dimers of dimethyl phthalate.