Abstract:
A liquid crystal aligning agent contains (1) at least one polymer selected from the group consisting of a polyamic acid obtainable by a reaction between a tetracarboxylic acid dianhydride and a diamine compound and an imidized polymer obtainable by cyclization with dehydration of the polyamic acid; (2) at least one first solvent selected from the group consisting of N-alkyl-2-pyrrolidones, lactones, and 1,3-dialkyl-2-imidazolidinones; (3) at least one second solvent selected from the group consisting of: (a) a first compound represented by general formula (I) wherein R is an alkylene group having 2 or 3 carbon atoms; R is an alkyl group having 1 to 4 carbon atoms an acetyl group or a propionyl group; R is an alkyl group having 1 to 3 carbon atoms, an alkoxyl group having 1 to 3 carbon atoms, or a halogen atom; a is 1 or 2; and b is 0 or integers of from 1 to 5; and (b) a second compound represented by general formula (II) wherein R is an alkyl group having 1 to 4 carbon atoms; R is an alkylene group having 2 or 3 carbon atoms; R is an alkyl group having 1 to 3 carbon atoms; and c is 1 or 2.
Abstract:
A liquid crystal aligning agent contains (1) at least one polymer selected from the group consisting of a polyamic acid obtainable by a reaction between a tetracarboxylic acid dianhydride and a diamine compound and an imidized polymer obtainable by cyclization with dehydration of the polyamic acid; (2) at least one first solvent selected from the group consisting of N-alkyl-2-pyrrolidones, lactones, and 1,3-dialkyl-2-imidazolidinones; (3) at least one second solvent selected from the group consisting of: (a) a first compound represented by general formula (I) wherein R is an alkylene group having 2 or 3 carbon atoms; R is an alkyl group having 1 to 4 carbon atoms an acetyl group or a propionyl group; R is an alkyl group having 1 to 3 carbon atoms, an alkoxyl group having 1 to 3 carbon atoms, or a halogen atom; a is 1 or 2; and b is 0 or integers of from 1 to 5; and (b) a second compound represented by general formula (II) wherein R is an alkyl group having 1 to 4 carbon atoms; R is an alkylene group having 2 or 3 carbon atoms; R is an alkyl group having 1 to 3 carbon atoms; and c is 1 or 2.
Abstract:
A liquid crystal alignment agent capable of not only exhibiting excellent alignment characteristics but also forming a liquid crystal alignment layer film with which the time from cancellation of voltage application to afterimage erasure in a liquid crystal display is short; a polymer therefor; and a diamine compound as a monomer therefor. For example, there are provided liquid crystal alignment agents comprising a diamine compound having an alicyclic group, such as methyl lithocholate (3,5-diaminobenzoate), a polyamic acid being a product of reaction between the same and a tetracarboxylic anhydride and an imidized polymer therefrom, and a polymer thereof. Also, a liquid crystal display comprising the liquid crystal alignment layer film is provided.
Abstract:
Vinylphenylpropionic acid derivatives; processes for producing the derivatives; polymers of the same; and radiosensitive resin compositions containing the polymers. The above polymers exhibit low radiation absorption and are useful as the resin component of radiosensitive resin compositions particularly suitable for chemically amplified resists. For example, t-butyl 4-vinylphenylpropionate is produced by (1) reacting t-butyl bromoacetate with tri(n-butyl)phosphine to obtain a quaternary phosphonium salt, (2) reacting this salt with a base to obtain a phosphorus ylide, (3) reacting this ylide with 2,4,6-tris(3',5'-di-t-butyl-4'-hydroxybenzyl)methyl-styrene to obtain a quaternary phosphonium salt, and (4) hydrolyzing this salt.