Process for the preparation of 4'-hydroxybiphenyl-4-carboxylic acid
申请人:MITSUI TOATSU CHEMICALS, Inc.
公开号:EP0240362A2
公开(公告)日:1987-10-07
A process for the preparation of 4ʹ-hydroxybiphenyl-4-carboxylic acid by reacting a cyclohexanone-4-carboxylic acid compound with phenol in the presence of an acid catalyst, and then subjecting the resulting 4,4-bis(4-hydroxyphenyl)cyclohexanecarboxylic acid compound to decomposition and dehydrogenation reactions in the presence of a base and a dehydrogenation catalyst. The aforesaid cyclohexanone-4-carboxylic acid compound is obtained by catalytically hydrogenating a 4-hydroxybenzoic acid compound in a secondary alcohol or tertiary alcohol solvent, and the reaction mixture thus obtained is directly used for the reaction with phenol.
A liquid-crystalline polymer comprising the repeating units of the general formula (I)
in which :
k is an integer from 1 to 30 ; and
R1 is
where :
X is -COO-or -OCO-: and
R2 is -COOR3, OCOR3, or -OR3
where :
R3 is
R4 and R5 being each independently -CH3, a halogen radical, or -CN, m and n being each independently an integer from 0 to 10 with the proviso that n is not 0 when R4 is -CH3, p being 0 or 1, and C marked with being an asymmetric carbon atom.
The polymers of the present invention exhibit a ferroelectricity even at temperatures around room temperature and as well have such a high speed of response to external factors that they can be used for displaying motion pictures, and the polymers may also be advantageously used as display elements for large displays or curved displays.
A liquid-crystalline polymer composition comprising a ferroelectric liquid-crystalline polymer and a low molecular weight liquid-crystalline compound which exhibits smectic C phase or chiral smectic C phase. Such liquid-crystalline polymer compositions have not only excellent moldabilities such as ease of orientation, but also exhibit chiral smectic C phase at wide temperature range with room temperatures and exhibit high speed response to changes of external fields and high contrast ratios when they are used for optical display elements.
一种液晶聚合物组合物,由铁电液晶聚合物和低分子量液晶化合物组成,该液晶聚合物组合物显示出手性 Smectic C 相或手性 Smectic C 相。这种液晶聚合物组合物不仅具有极佳的成型性(例如易于取向),而且在与室温相同的宽温度范围内显示手性共晶 C 相,在用于光学显示元件时对外部场变化具有高速响应和高对比度。
A ferroelectric liquid-crystalline polymeric composition
申请人:IDEMITSU KOSAN COMPANY LIMITED
公开号:EP0310081A2
公开(公告)日:1989-04-05
The liquid-crystalline polymeric composition of the invention comprises (A) a non-liquid-crystalline polymeric compound and (B) a low-molecular liquid-crystalline compound each having a proton donor and/or a proton acceptor in the molecular structure and the low-molecular compound has a chiral smectic C phase. By virtue of these functional groups forming hydrogen bonds between the components, the liquid-crystalline polymeric composition of the invention is not a mere blend of the components liable to cause phase separation but is imparted with greatly increased stability and uniformity of the blend as well as responsivity of high speed.
本发明的液晶聚合物组合物包括(A)非液晶聚合物化合物和(B)低分子液晶化合物,每种化合物的分子结构中都有质子供体和/或质子受体,且低分子化合物具有手性 Smectic C 相。由于这些官能团在各组分之间形成氢键,本发明的液晶聚合物组合物不再是容易导致相分离的单纯组分混合物,而是大大提高了混合物的稳定性和均匀性以及高速响应性。
Thermotrope aromatische Polyestercarbonate, ein Verfahren zu ihrer Herstellung und ihre Verwendung
申请人:BAYER AG
公开号:EP0303935A2
公开(公告)日:1989-02-22
Thermotrope vollaromatische Polyestercarbonate, die einkondensierte Reste von gegebenenfalls substituierter 3-Hydroxybenzoesäure enthalten, besitzen hohe Steifigkeit, hohe Schlagzähigkeit und Reißdehnung und lassen sich dennoch unter üblichen Bedingungen aufgrund günstiger Schmelzviskosität verarbeiten.