(EN) A process for synthesizing enantiomerically pure chiral secondary alcohol compounds linked to a heterocyclic core moiety, using a natural chiral molecule starting material. The inventive process is particularly useful for bulk manufacturing of chiral secondary alcohol compounds.(FR) Procédé de synthèse de composés d'alcool secondaires chiraux purs sur le plan énantiomère et liés à une fraction de noyau hétérocyclique au moyen d'un matériau de départ à molécules chirales naturelles. Le procédé selon l'invention est particulièrement utile pour la fabrication en masse de composés d'alcools secondaires chiraux.
Salicylic acid copolymers and their metal salts, production process thereof, color-developing agents comprising metal salts of the copolymers and color-developing sheets employing the agents
申请人:MITSUI TOATSU CHEMICALS, Inc.
公开号:EP0268878A2
公开(公告)日:1988-06-01
Disclosed herein are salicylic acid copolymers having a weight average molecular weight of 500 10,000 and obtained (a) by condensing salicylic acid (i) with a benzyl alcohol (ii) and/or benzyl ether (iii) or a benzyl halide (iv) in the presence of an acid catalyst or (b) by reacting a co-condensation resin of (i) and (ii) and/or (iii) with (iv) or (c) by reacting a co-condensation resin of (i) and (ii) and/or (iii) or (iv) with a styrene derivative in the presence of an acid catalyst; multivalent metal salts of the salicylic acid copolymers; color-developing agents comprising the multivalent metal salts; and color-developing sheets suited for pressure-sensitive copying paper and comprising the color-developing agents. Their production processes are also disclosed.
A color-developing composition comprises a multivalent-metal-modified salicylic acid resin (Resin A) and a polycondensation resin (resin B) at a weight ratio of 90-30 to 10-70. Resin A is composed of 5-35 mole% of a structural unit (I) and 65-95 mole% of at least one structural unit (II) or 65-95 mole% of a coupled structural unit of at least one unit (II) and at least one unit (III) and has a weight-average molecular weight of 350-5,000. Resin B is composed of the unit (II) and/or the unit (III) and has a weight-average molecular weight of 350-5,000.
wherein Z represents M/m, M being a metal ion of m valence and m being an integer; R₁ and R₂ represent H or a C₁₋₁₂ alkyl, aralkyl, aryl or cycloalkyl group; R₃ and R₆ represent H or a C₁₋₄ alkyl group; and R₄ and R₅ represent H or CH₃.
一种显色组合物包括一种多价金属改性水杨酸树脂(树脂 A)和一种缩聚树脂(树脂 B),两者的重量比为 90-30 比 10-70。树脂 A 由 5-35 摩尔%的结构单元(I)和 65-95 摩尔%的至少一个结构单元(II)或 65-95 摩尔%的至少一个单元(II)和至少一个单元(III)的耦合结构单元组成,其重量平均分子量为 350-5000。树脂 B 由单元(II)和/或单元(III)组成,重量平均分子量为 350-5000。
其中 Z 代表 M/m,M 为 m 价金属离子,m 为整数;R₁ 和 R₂ 代表 H 或 C₁₋₁₂ 烷基、芳基、芳烷基或环烷基;R₃ 和 R₆ 代表 H 或 C₁₋₄ 烷基;以及 R₄ 和 R₅ 代表 H 或 CH₃。
Verfahren zum chemischen Recycling von Polycarbonaten
申请人:BAYER AG
公开号:EP0688807A1
公开(公告)日:1995-12-27
Gegenstand der vorliegenden Erfindung ist ein Verfahren zum chemischen Recycling von Polycarbonaten durch katalysierte Umsetzung mit Diarylcarbonaten zu Oligocarbonaten, diese werden kristallisiert, gereinigt und dann wieder zu Polycarbonaten polykondensiert, wobei gegebenenfalls vor der Kristallisation unlösliche Bestandteile entfernt werden.
PROCESSES FOR PRODUCTION OF GROUP II METAL SULFIDE PHOSPHOR PRECURSORS AND PHOSPHORS
申请人:Kuraray Co., Ltd.
公开号:EP2216295A1
公开(公告)日:2010-08-11
The process of the invention is provided to achieve uniform doping of an activator metal into phosphor particles and to improve efficiency of utlization of a metal element to be used in the production of a Group II metal sulfide phosphor and a precursor thereof. Specifically, the object of the invention is achieved by a process for producing a Group II metal sulfide phosphor precursor, comprising adding to an organic solvent an aqueous solution containing at least one of a Group II element compound, a sulfurizing agent, and a compound containing any of copper, silver, manganese, gold, and rare-earth elements to obtain a reaction mixture, heating the reaction mixture to produce an azeotrope of the water and the organic solvent, and removing the water from the reaction mixture to produce a desired Group II metal sulfide in the reaction mixture, wherein the removal of the water from the reaction mixture is carried out by recovering only the water condensed from a vapor produced by the azeotropic distillation.
本发明提供的工艺可实现在荧光粉颗粒中均匀掺入活化剂金属,并提高用于生产第 II 族金属硫化物荧光粉及其前体的金属元素的利用效率。具体地说,本发明的目的是通过一种生产第二族金属硫化物荧光粉前体的工艺来实现的,该工艺包括向有机溶剂中加入含有第二族元素化合物、硫化剂和含有铜、银、锰、金和稀土元素中任何一种的化合物的水溶液,以获得反应混合物、加热反应混合物以产生水和有机溶剂的共沸物,从反应混合物中除去水以在反应混合物中生成所需的第二族金属硫化物,其中从反应混合物中除去水的方法是仅回收共沸蒸馏产生的蒸汽中冷凝的水。