Abstract: A liquid crystal alignment agent includes a polymer composition obtained by subjecting a diamine component and a tetracarboxylic dianhydride component to a reaction, a solvent, and a hydroxyl compound. Preferably, the hydroxyl compound has a weight average molecular weight ranging from 300 to 1,000,000. A liquid crystal alignment film formed from the liquid crystal alignment agent and a liquid crystal display element including the liquid crystal alignment film are also disclosed.

Abstract: A liquid crystal alignment agent includes a polymer and an organic solvent for dissolving the polymer. The polymer contains a repeating structural unit represented by the following formula (I): wherein each of P and Q is a divalent organic group. The liquid crystal alignment agent has a viscosity in the range from 5 to 40 cps at 25° C. A liquid crystal alignment film made of the liquid crystal alignment agent and a liquid crystal display element including the liquid crystal alignment film are also disclosed.

Abstract: A method for making a treated polymer for a liquid crystal alignment agent includes the steps of: subjecting a tetracarboxylic dianhydride compound and a diamine compound to conduct a polymerization reaction to obtain an untreated polymer; preparing a co-precipitating solvent for the untreated polymer which includes a major amount of a poor solvent and a minor amount of a good solvent; and subjecting the untreated polymer to a treatment with the co-precipitating solvent such that at least a significant amount of a polymer fraction having a molecular weight not larger than 3,000 is removed from the untreated polymer to obtain the treated polymer. A treated polymer for a liquid crystal alignment agent, a liquid crystal alignment agent including the treated polymer, a liquid crystal alignment film formed of the liquid crystal alignment agent, and a liquid crystal display element including the liquid crystal alignment film are also disclosed.

Abstract: A polysiloxane-grafted polyimide resin composition includes a polysiloxane-grafted polyimide resin, and a solvent. The polysiloxane-grafted polyimide resin is represented by formula (I): wherein W represents a tetravalent organic group, R represents a trivalent organic group, and X represents a polysiloxane-containing group.

Abstract: A liquid crystal alignment agent includes a polymer composition obtained by subjecting a diamine component and a tetracarboxylic dianhydride component to a reaction, a solvent, and a hydroxyl compound. Preferably, the hydroxyl compound has a weight average molecular weight ranging from 300 to 1,000,000. A liquid crystal alignment film formed from the liquid crystal alignment agent and a liquid crystal display element including the liquid crystal alignment film are also disclosed.

Abstract: The present invention provides a free radical polymerizable liquid crystal alignment agent having superior coating ability, a manufacturing method, which comprises the process of coating the liquid crystal alignment agent onto a substrate, and processing the liquid crystal alignment agent with dehydration/ring-closure reaction and free radical polymerization, enables obtaining a liquid crystal alignment film with superior reliability, superior voltage holding ratio and easy control of pretilt angle, and enables the manufacture of a liquid crystal display element provided with a liquid crystal alignment film. The free radical polymerizable liquid crystal alignment agent comprises a molecular compound containing at least 2 polymerizable maleamic acid groups and an organic solvent.

Abstract: A polysiloxane-grafted polyimide resin composition includes a polysiloxane-grafted polyimide resin, and a solvent. The polysiloxane-grafted polyimide resin is represented by Formula (I): wherein W represents a tetravalent organic group, R represents a trivalent organic group, and X1 and X2 independently represent a polysiloxane-containing group.

Abstract: The present invention provides a free radical polymerizable liquid crystal alignment agent having superior coating ability, a manufacturing method, which comprises the process of coating the liquid crystal alignment agent onto a substrate, and processing the liquid crystal alignment agent with dehydration/ring-closure reaction and free radical polymerization, enables obtaining a liquid crystal alignment film with superior reliability, superior voltage holding ratio and easy control of pretilt angle, and enables the manufacture of a liquid crystal display element provided with a liquid crystal alignment film. The free radical polymerizable liquid crystal alignment agent comprises a molecular compound containing at least 2 polymerizable maleamic acid groups and an organic solvent.

Abstract: A liquid crystal alignment agent including a polymer composition and a solvent. The polymer composition is obtained by subjecting a mixture including a tetracarboxylic dianhydride component, a multi-amine component of formula (I) defined herein, and a diamine component to a reaction. The diamine component includes a diamine compound of formula (II) defined herein.

Abstract: The present invention provides a liquid crystal alignment agent and a liquid crystal alignment film formed therefrom, as well as a liquid crystal display element provided with the liquid crystal alignment film. More specifically, the present invention provides a liquid crystal alignment agent and liquid crystal alignment film formed therefrom, as well as a liquid crystal display element provided with the liquid crystal alignment film without image sticking problems and having superior voltage holding ratio. The liquid crystal alignment agent includes: a polymer (A) obtained from a reaction between tetracarboxylic dianhydride compound and diamine compounds, an epoxy compound (B), and an organic solvent (C). Wherein the liquid crystal alignment agent is coated on a glass substrate, and heated for 15 minutes at 220° C. to forth a hard coating film. The hard coating film is extracted for 72 hours by using acetone at 60° C.

Abstract: The present invention provides a method of forming a liquid crystal alignment film comprising a process of coating a liquid crystal alignment agent onto a substrate, and then processing said alignment agent with dehydration/ring-closure reaction and free radical polymerization, wherein said liquid crystal alignment agent comprises a molecular compound containing at least 2 polymerizable maleamic acid groups (A), a polymer (B), and an organic solvent (C); wherein the polymer (B) comprises at least one kind of polymer obtained from condensation polymerization, which is selected from the groups consisting of polyester, polyesterimide, polyamide-imide acid, polyamide-imide, polyamide acid ester, polyamide and polyimide series polymer.

Abstract: The present invention provides a free radical polymerizable liquid crystal alignment agent having superior coating ability, a manufacturing method, which comprises the process of coating the liquid crystal alignment agent onto a substrate, carrying out dehydration/ring-closure and free radical polymerization, enables obtaining a liquid crystal alignment film with superior reliability, superior voltage holding ratio and easy control of pretilt angle, and enables the manufacture of a liquid crystal display element provided with a liquid crystal alignment film. The free radical polymerizable liquid crystal alignment agent comprises a molecular compound containing at least 2 polymerizable maleamic acid groups and an organic solvent.

Abstract: A liquid crystal alignment agent includes a polymer and an organic solvent for dissolving the polymer. The polymer contains a repeating structural unit represented by the following formula (I): wherein each of P and Q is a divalent organic group. The liquid crystal alignment agent has a viscosity in the range from 5 to 40 cps at 25° C. A liquid crystal alignment film made of the liquid crystal alignment agent and a liquid crystal display element including the liquid crystal alignment film are also disclosed.

Abstract: A method for making a treated polymer for a liquid crystal alignment agent includes the steps of: subjecting a tetracarboxylic dianhydride compound and a diamine compound to conduct a polymerization reaction to obtain an untreated polymer; preparing a co-precipitating solvent for the untreated polymer which includes a major amount of a poor solvent and a minor amount of a good solvent; and subjecting the untreated polymer to a treatment with the co-precipitating solvent such that at least a significant amount of a polymer fraction having a molecular weight not larger than 3,000 is removed from the untreated polymer to obtain the treated polymer. A treated polymer for a liquid crystal alignment agent, a liquid crystal alignment agent including the treated polymer, a liquid crystal alignment film formed of the liquid crystal alignment agent, and a liquid crystal display element including the liquid crystal alignment film are also disclosed.

Abstract: The present invention provides a liquid crystal alignment agent and a liquid crystal alignment film formed therefrom, as well as a liquid crystal display element provided with the liquid crystal alignment film. More specifically, the present invention provides a liquid crystal alignment agent and liquid crystal alignment film formed therefrom, as well as a liquid crystal display element provided with the liquid crystal alignment film without image sticking problems and having superior voltage holding ratio. The liquid crystal alignment agent includes: a polymer (A) obtained from a reaction between tetracarboxylic dianhydride compound and diamine compounds, an epoxy compound (B), and an organic solvent (C). Wherein the liquid crystal alignment agent is coated on a glass substrate, and heated for 15 minutes at 220° C. to forth a hard coating film. The hard coating film is extracted for 72 hours by using acetone at 60° C.

Abstract: The present invention provides a free radical polymerizable liquid crystal alignment agent having superior coating ability, a manufacturing method, which comprises the process of coating the liquid crystal alignment agent onto a substrate, and processing the liquid crystal alignment agent with dehydration/ring-closure reaction and free radical polymerization, enables obtaining a liquid crystal alignment film with superior reliability, superior voltage holding ratio and easy control of pretilt angle, and enables the manufacture of a liquid crystal display element provided with a liquid crystal alignment film.

Abstract: The present invention provides a free radical polymerizable liquid crystal alignment agent having superior coating ability, a manufacturing method, which comprises the process of coating the liquid crystal alignment agent onto a substrate, carrying out dehydration/ring-closure and free radical polymerization, enables obtaining a liquid crystal alignment film with superior reliability, superior voltage holding ratio and easy control of pretilt angle, and enables the manufacture of a liquid crystal display element provided with a liquid crystal alignment film. The free radical polymerizable liquid crystal alignment agent comprises a molecular compound containing at least 2 polymerizable maleamic acid groups and an organic solvent.