摘要:
A melt-processable copolyester composed of the following structural units (I), (II) and (III) and/or (IV) as main structural components, whereinunit (I) is represented by the formula ##STR1## wherein X.sub.1, X.sub.2, X.sub.3 and X.sub.4, independently from each other, represent H, F, Cl, Br, CH.sub.3 or C(CH.sub.3).sub.3, provided that X.sub.1 to X.sub.4 do not simultaneously represent H, and n is 2 or 4,unit (II) is at least one unit selected from the group consisting of ##STR2## wherein at least one of the hydrogen atoms in each aromatic ring in units (II), (III) and (IV) may be substituted by an alkyl or alkoxy group having 1 to 4 carbon atoms or a halogen atom.The proportion of unit (I) is 2.5 to 35 mole %, the proportion of unit (II) is 2.5 to 35 mole %, and the proportion of unit (III), (IV) or a combination of units (III) and (IV) is 30 to 95 mole %.
摘要:
The present invention provides a production of 2-hydroxynaphthalene-6-carboxylic acid improved in the yield and the selective ratio, in which .beta.-naphthol and water formed in the reaction system are eliminated therefrom through the reaction.
摘要:
The present invention provides a method of production of aromatic hydroxycarboxylic acids by the reaction of alkaline metal salts of phenols or naphthols with carbon dioxide, in which free phenols or free naphthols produced as by-products in the reaction system are removed from the system so as to control the content of free phenols or free naphthols at a suitable level, by which a purer objective compound can be obtained at high yield under the condition of lower temperature and shorter time.
摘要:
Provided is a liquid crystalline polymer which is obtained by copolymerizing at least one polyfunctional aromatic monomer selected from the group consisting of the compounds represented by the formulae (I), (II) and (III) below with at least one polymerizable monomer. The liquid crystalline polymer of the present invention is excellent in heat resistance, molding properties, flow properties and mechanical properties, especially it provide molded article with improved weld strength.
摘要:
The present invention provides a liquid-crystalline polyester resin which comprises monomer units derived from 2-hydroxy-3-naphthoic acid and/or 2-hydroxynaphthalene-3,6-dicarboxylic acid in an amount of 1-5000 mmol % based on the total monomer components of the resin and an alkaline metal compound in an amount of 10-3000 ppm as alkaline metal based on the total monomer components of the resin. The liquid-crystalline polyester resin of the present invention has good colorability, improved heat resistance and good mechanical properties.
摘要:
The present invention provides a safe charge control agent which exhibits an excellent negative chargeability and excellent dispersibility in and compatibility with binder resins, and is even applicable for col or toners. Specifically, the charge control agent consists of a naphthol derivative of formula [I]: and a salt thereof, and an electrophotographic toner comprising the agent are provided.
摘要:
The present invention provides a method for preparing dimer of a monohydroxy aromatic compound. In the method of the present invention, oxidative coupling reaction of a monohydroxy aromatic compound represented by formula [I]: Ar—OH [I] wherein Ar represents an optionally substituted aromatic group is carried out in a nitrogen containing polar solvent in the presence of a copper salt. By the method of the instant invention, dimer of the monohydroxy aromatic compound can be obtained in high yield.
摘要:
A crystalline mixture solid containing maltitol having an oil absorptivity of 0.1 to 6.9 wt % and a bulk density of 0.60 to 0.75 g/cc when it is ground and classified to ensure that at least 70 wt % of the obtained particles should have a particle size of 16 to 50 mesh and a process for producing a crystalline mixture solid containing maltitol, comprising introducing air bubbles into a maltitol aqueous solution. According to this process, a crystalline mixture solid containing maltitol having high solubility and almost no moisture absorption is produced at a high work efficiency and a low cost in a short period of time.
摘要:
The present invention provides a binaphthol compound represented by formula [1]: and a salt thereof. The binaphthol compound of the present invention is useful for manufacturing antiseptic compounds or chiral catalysts. According to the method of the present invention, binaphthol compounds can be prepared in high yield with low cost.
摘要:
A toning agent for an azo pigment, an azo pigment with a modified tone, and process for preparing the same are provide. 2-hydroxynaphthalene-3,6-dicarboxylic acid or a derivative thereof is admixed with a primary coupler component for an azo pigment and the mixed coupler composition and an aromatic diazonium are coupled.