摘要:
A polyimide resin composed essentially of repeating units represented by the general formula: ##STR1## where R is a divalent aromatic hydrocarbon radical.
摘要:
Butene-1 is polymerized in the presence of a catalytic system comprising a solid catalytic component (A), a trialkylaluminum compound (B), an organic acid ester (C), and an organoaluminum compound (D) at a molar ratio of (D) to (B) ranging 0.1 to 10 wherein said solid catalytic component (A) is obtained by reacting a reaction product (a) of a Grignard reagent with a chain or cyclic hydropolysiloxane having the unit ##EQU1## (R.sup.1 represents an alkyl, aryl, aralkyl, alkoxy or aryloxy group; a is 0, 1 or 2; b is 1, 2 or 3 and a+b.ltoreq.3) with at least one compound having the formulaR.sub.n.sup.2 M(.sup.(z) X.sub.z-n(R.sup.2 represents a C.sub.1 to C.sub.12 hydrocarbon moiety; M represents Al or Si; z represents atomic value of 3 or 4; X represents a halogen atom; n is 0, 1-(z-1) to obtain a reaction product (b) and further reacting said reaction product (b) with at least one titanium halide in the presence of an organic acid ester.
摘要:
A copolymer of ethylene and a C.sub.4 -C.sub.10 .alpha.-olefin at a content of 0.5 to 10 mol % is produced by forming a polymerization catalyst system by reacting a Grignard reagent with a chain or cyclic hydropolysiloxane having the unit R.sup.1.sub.a H.sub.b SiO.sub.(4-a-b/2) (R.sup.1 represents an alkyl, aryl, aralkyl, alkoxy or aryloxy group; a is 0, 1 or 2; b is 1, 2 or 3 and a+b.ltoreq.3), to form a reaction product (a); reacting the reaction product (a) with at least one compound having the formula R.sup.2.sub.n M.sup.(z) X.sub.z-n (R.sup.2 represents a C.sub.1 to C.sub.12 hydrocarbon moiety; M represents Al or Si; z represents atomic value of 3 or 4; X represents a halogen atom; n is 0, 1 . . . (z-1) in the presence of an aromatic hydrocarbon solvent at lower than 85.degree. C. to form a reaction product (b); and reacting the reaction product (b) with at least one titanium halide in the presence of an organic acid ester (c) to obtain a solid catalytic component (A) and adding an organoaluminum compound (B) and then, polymerizing ethylene and a C.sub.4 -C.sub.10 .alpha.-olefin in the presence of a catalytic amount of the polymerization catalyst system in an inert hydrocarbon solvent or in a liquid form of the C.sub.4 -C.sub.10 .alpha.-olefin in which ethylene is dissolved.
摘要:
An agent for vertical orientation treatment consisting essentially of a polyimide which contains a linear alkyl group having at least 12 carbon atoms in an amount of at least 5% by weight of the alkyl group to the total weight of the polyimide, and which, when a coating film of the polyimide is formed on a substrate, has a surface energy of not more than 38 dyn/cm.
摘要:
The present invention relates to an alignment treating agent for a liquid crystal cell, which comprises an organic solvent-soluble polyimide resin comprising a tetracarboxylic acid and a diamine, at least 10 mol % of the diamine having a bivalent organic group selected from the group consisting of: ##STR1## The aligned film for a liquid crystal using the solvent-soluble polyimide resin of the present invention does not require a heat treatment at a high temperature at the time of forming a resin film and enables to use a substrate poor in heat-resistance, and alignment properties such as a tilt angle and a voltage maintenance of the aligned film are not deteriorated even after durability test at a high temperature.
摘要:
An alignment treating agent for a liquid crystal cell, which comprises a polyimide resin of the formula (I): wherein R1 is a tetravalent organic group constituting a tetracarboxylic acid or its derivative, R2 is a bivalent organic group constituting a diamine, and m is a positive integer, provided that at least 10 mol % of R2 is a bivalent organic group selected from the group consisting of: wherein X is H, OH, an alkyl group, an alkoxy group, a carboxyl group, an acyl group or a halogen atom, said polyimide resin being made insoluble in an organic solvent by coating a precursor solution of said polyimide resin on a substrate, followed by heating.
摘要:
A ferroelectric liquid crystal element comprising a pair of substrates each having a transparent electrode and an orientation controlling film formed on the electrode, and ferroelectric liquid crystal sandwiched between the substrates in contact with the film, wherein said orientation controlling film is an organic polymer film treated by rubbing treatment and capable of giving nematic liquid crystal a pretilt angle of at least 10.degree. to the substrate surface.
摘要:
A liquid crystal aligning agent consisting essentially of a polyimide resin obtained by the polymerization of a diamine, a tetracarboxylic acid dianhydride and a monoamine of the formula:R.sup.2 (R.sup.1).sub.n NH.sub.2 (I)wherein R.sup.1 is a divalent organic group, R.sup.2 is an alkyl group having from 6 to 20 carbon atoms, and n is 0 or 1.
摘要:
This invention is concerned with a composition to be used as an agent for aligning liquid crystals in a liquid crystal cell, wherein liquid crystal molecules are aligned with an increased pretilt angle with respect to the substrate, such composition consists essentially of a polyimide resin precursor having repeating units represented by the formula (I) ##STR1## wherein R.sub.1 denotes an organic group constituting a tetracarboxylic acid or its derivative; and R.sub.2 represents a divalent organic group constituting a diamine; anda precursor of a diimide compound represented by the formula (II) or (III): ##STR2## wherein R.sub.3 denotes a divalent organic group constituting a diamine; each of R.sub.4 and R.sub.5 represents an organic groups constituting a dicarboxylic acid containing an alkyl group having 6 to 20 carbon atoms, or its derivative, ##STR3## wherein R.sub.6 denotes an organic group constituting a tetracarboxylic acid or its derivative, and each of R.sub.7 and R.sub.8 represents an organic group constituting a monoamine containing an alkyl group having 6 to 20 carbon atoms.
摘要:
The present invention provides a transparent substrate capable of improving the light extraction efficiency of an organic electroluminescence device, and an organic electroluminescence device with high luminous efficiency and with excellent mass productivity using the substrate. The present invention relates to a transparent substrate for an organic electroluminescence device characterized in that an optical interference film comprising at least one layer having such a refractive index and a film thickness as to reduce a quantity of reflection of light emitted from a light-emitting layer is provided on both sides of the transparent substrate in the organic electroluminescence device, and to an organic electroluminescence device comprising the transparent substrate.