335 results about "Tetrolic acid" patented technology

The invention discloses a polyimide liquid crystal vertical alignment agent, a prepration method and a liquid crystal box prepared thereby. The liquid crystal vertical alignment agent is prepared by dissolving soluble polyimide which accounts for 2.5-5% of the weight of the alignment agent into an organic solvent, the soluble polyimide is prepared by leading 1-50 parts by weight of tetracarboxylic dianhydride, 1-50 parts by weight of diamine with a special structure, 1-50 parts by weight of diamine and 40-80 parts by weight of organic solvent to react under the protection of nitrogen and at the temperature of 160-180 DEG C for 5-12 hours, and the diamine with the special structure is prepared by leading HO-B-OH, a catalyst, the organic solvent, halogenated hydrocarbon X-R and dinitro-substituted benzoyl chloride to carry out three-step reaction. The polyimide of a liquid crystal vertical alignment film formed by using the liquid crystal vertical alignment agent disclosed by the invention is soluble, a pretitle angle of the liquid crystal box prepared by spin-coating the polyimide liquid crystal vertical alignment agent is close to 90 degrees, and a liquid crystal display prepared thereby has excellent performances of fast response, wide viewing angle, high contrast degree and the like.

There is provided an anti-reflective coating forming composition for use in a lithography and for forming an anti-reflective coating that can be developed with an alkaline developer for photoresist, and a method for forming photoresist pattern by use of the anti-reflective coating forming composition. Concretely, the composition comprises a polyamic acid produced from a tetracarboxylic dianhydride compound and a diamine compound having at least one carboxyl group, a compound having at least two epoxy groups, and a solvent.

Disclosed is a novel tetracarboxylic acid compound having excellent characteristics such as high transparency, low dielectric property, low water absorption, low thermal expansion, solvent solubility and etching characteristics, while exhibiting high heat resistance at the same time. This tetracarboxylic acid compound is useful as a raw material monomer for producing a polyesterimide or a polyamideimide. Specifically disclosed is a tetracarboxylic acid compound represented by the general formula (1) or (2) below.

In the formulae, A represents a divalent group; X¹, X² and X³ respectively represent a hydrogen atom or the like; R¹, R², R³ and R⁴ respectively represent a carboxyl group or an acid anhydride group; n represents 1 or 2; and ring B represents a cyclic group.

A liquid crystal aligning agent for obtaining a liquid crystal alignment film excelling in not only liquid crystal alignment performance but also electrical properties through photoalignment procedure; and a liquid crystal display device making use of this liquid crystal aligning agent, which can resolve problems invited by rubbing treatment of liquid crystal alignment film, exhibiting high reliability and which can minimize display unevenness and exudation around sealing material. There is provided a liquid crystal aligning agent for photoalignment, characterized by containing at least one of a polyamic acid, the polyamic acid obtained by reacting a diamine component containing a diamine of the following formula (1) with a tetracarboxylic acid dianhydride component containing a tetracarboxylic acid dianhydride with alicyclic structure into a polymer, and a polyimide obtained from the polyamic acid. There is further provided a liquid crystal display device having a liquid crystal alignment film obtained from the above liquid crystal aligning agent through photoalignment procedure. (wherein two of R<1> to R<10> are primary amino, and each of the rest is a hydrogen atom or a monovalent organic group other than primary amino, provided that they may be identical with or different from each other).

The invention provides liquid crystal alignment agents for photo-alignment, liquid crystal photo-alignment layers, and liquid crystal displays using the same. The liquid crystal alignment agents contain tetracarboxylic dianhydride mixture including cyclopentane tetracarboxylic dianhydride, which is reacted with specific diamine to obtain polyamide acid or its derivatives. The liquid crystal alignment agents are applied to form a photo-alignment film with excellent alignment property and high light transmittance, because of light sensitivity of the chemical change caused by illumination. In addition, the photo-alignment film is applied in liquid crystal displays, the electrical characteristics required by liquid crystal alignment film is satisfied, the voltage maintaince ratio is high, the iron amount is little, the remained charge amount is little, etc.

A photosensitive polyimide resin precursor composition capable of providing a polyimide resin that is not substantially colored, is transparent and has heat resistance, an optical polyimide resin obtained from the composition, and an optical waveguide using the polyimide resin. The photosensitive polyimide resin precursor composition contains (a) 100 parts by weight of a polyamic acid obtained from a tetracarboxylic acid dianhydride and a diamine, (b) 0.01 parts by weight or more and less than 5 parts by weight of a 1,4-dihydropyridine derivative, (c) 5-50 parts by weight of a glycol (ether). The optical polyimide resin is obtained by irradiating the photosensitive resin precursor composition with UV light, followed by exposure, heating, development, and then heating. The optical waveguide comprises a core layer comprising the optical polyimide resin, and a cladding layer thereof.

An aqueous polyimide precursor solution composition, in which a polyamic acid, which is formed by the reaction of a tetracarboxylic acid component and a diamine component, is dissolved in an aqueous solvent together with an imidazole in an amount of 1.6 mole or more per mole of the tetracarboxylic acid component of the polyamic acid.

This invention relates to a laminate which changes in dimension to such a small extent as not to cause curling and warpage when the ambient humidity changes and is useful for flexible printed wiring boards. The laminate possesses a polyimide layer or layers of polyimides formed on a conductor by coating and at least one of the polyimide layers is composed of polyimide of low hygroscopic expansion obtained by the reaction of diamines containing 20 mol % or more of 4,4′-diamino-2,2′-dimethylbiphenyl with a tetracarboxylic acid compound and exhibiting a coefficient of linear hygroscopic expansion of 15×10⁻⁶/% RH or less.

A polyimide precursor consisting of a repeating unit represented by the following chemical formula (1):

and

• • a repeating unit represented by the following chemical formula (2):

in which A is a tetravalent group of a tetracarboxylic acid, from which carboxyl groups have been removed; B is a divalent group of a diamine, from which amino groups have been removed; with the proviso that the A group and the B group contained in each repeating unit may be the same as, or different from each other; and X₁ and X₂ are each independently hydrogen, an alkyl group having 1 to 6 carbon atoms, or an alkylsilyl group having 3 to 9 carbon atoms,

• • the amount of the repeating unit represented by the chemical formula (2) is 30 mol % or more and 90 mol % or less relative to the total repeating units,
  • 50 mol % or more of the total amount of the B group in the chemical formula (1) and the chemical formula (2) is p-phenylene group and/or a specific divalent group containing two or more benzene rings,
  • the polyimide precursor is produced by thermal imidization.

The instant invention relates to certain cross-linked polyamides and their use in the paper and board industry for improving dry strength. The polyamide from the reaction of a di- or tri-primary amine with a di- or tri- or tetra carboxylic acid is further reacted with a di- or tri-functional cross-linking compound to give a cationic or anionic product with no reactive groups.

Disclosed are a gas separation membrane and a gas separation method in which at least one species of organic vapor is separated and recovered from an organic vapor mixture using the gas separation membrane. The gas separation membrane is made of an aromatic polyimide composed of a tetracarboxylic acid component consisting of an aromatic ring-containing tetracarboxylic acid and a diamine component comprising 10 to 90 mol % of a combination of (B1) 3,4′-diaminodiphenyl ether and (B2) 4,4′-diaminodiphenyl ether at a B1 to B2 molar ratio, B1/B2, ranging from 10/1 to 1/10, and 10 to 90 mol % of other aromatic diamine.

The invention relates to a diamine, a polyamic acid or a derivative thereof, a liquid crystal alignment agent, a liquid crystal alignment film, and a liquid crystal display element. The present invention relates to a liquid crystal alignment agent containing a polyamic acid or a derivative thereof, and the polyamic acid or its derivative is obtained by reacting a tetracarboxylic dianhydride with a diamine containing a compound represented by the formula (1). By using the liquid crystal alignment agent of the present invention, it is possible to form a liquid crystal alignment film of a liquid crystal display device which does not deteriorate under strong light exposure for a long period of time.

An object of the present invention is to provide a polyimide precursor composition that can be cured at low temperatures (250° C. or lower), while having a low viscosity even at a high concentration, and a method of producing the same. Another object of the present invention is to provide a polyimide coating film obtained from the polyimide precursor composition and having good physical properties, and a method of producing the same. Furthermore, another object of the present invention is to provide a photosensitive resin composition containing the polyimide precursor composition, and a method of producing the same. These objects can be achieved by the polyimide precursor composition containing an imidized tetracarboxylic acid having a specific structure and a diamine having a specific structure.

The invention relates to a diamine, a polymer obtained from a reaction with the presence of the diamine, a liquid crystal aligning agent containing the polymer, a liquid crystal alignment layer and a liquid crystal display device, wherein the diamine contains alkaline nitrogen atoms in diphenylamine structure at two parts of a molecule, so that the diamine reacts with tetracarboxylic dianhydride to obtain a liquid crystal aligning agent containing polyamide acids or derivatives thereof. Moreover, the liquid crystal display device made of the liquid crystal alignment layer formed by the liquid crystal aligning agent exhibits low ion density and long-term reliability.

The present invention relates to a Gia Min, Polya Mick acid or its derivative, a rubbing agent, a film for liquid crystal display , and a liquid crystal display element. The present invention relates to a polyamide acid or ramification thereof obtained through diamine reaction of at least one in the Gia Min in the tetracarboxylic acid dianhydride and an including format (1).the view angle features is good, and the display quality cannot be reduced for exposing under the strong light for a long time. R is hydrogen, and -OH, the carbon number is 1-6 alkyl group or the alkoxy number is 1-6, the X1 and the X2 independently have alkylene of the carbon number is 1-8 and/or 2 organic group of the phenylene.

The invention provides tetracarboxylic dianhydride containing triazole, a polymer, a liquid crystal aligning agent, a liquid crystal aligning membrane, and a display element. The tetracarboxylic dianhydride is represented by the formula (1); wherein in the formula (1), the X represents a divalent organic group containing at least one triazole ring, the R1 and R2 individually represent one of trivalent groups, which are represented in the description; and at least one hydrogen atom of these groups can be replaced by a methyl group, an ethyl group, or a phenyl group. The liquid crystal aligning agent can form a liquid crystal aligning membrane that is hard to peel off or eliminate.

A polyimide containing at least one of repeating units represented by the following general formulae (1) and (2):

wherein the formulae (1) and (2), R¹, R², and R³ each independently represents a hydrogen atom or the like, R⁴ represents an aryl group having 6 to 40 carbon atoms, and n represents an integer of 0 to 12, wherein a total amount of the repeating units represented by the general formulae (1) and (2) is 90% by mole or more relative to all repeating units.

Provided is a polyimide film having a non-thermoplastic polyimide layer, wherein: the non-thermoplastic polyimide constituting the non-thermoplastic polyimide layer preferably contains at least one ofa biphenyl-tetracarboxylic dianhydride (BPDA) residue derived from 3,3',4,4'-BPDA and a phenylenebis(trimellitic monoester) dianhydride (TAHQ) residue derived from 1,4-TAHQ, as well as at least one of a pyromellitic dianhydride (PMDA) residue derived from PMDA and a napthalenetetracarboxylic dianhydride (NTCDA) residue derived from 2,3,6,7-NTCDA, the total amount of these residues being at least80 mol parts with respect to 100 mol parts of a tetracarboxylic acid residue; and the dielectric loss tangent (Df) is preferably 0.004 or less.

The invention discloses a preparation method of dicarboxylic acid with a branch at an alpha position for aluminum electrolytic capacitor electrolyte. The method comprises the following steps of: adding an absolute ethyl alcohol solution of alkali into an anhydrous xylene solution of an ester shown as a general formula (1), dropping an anhydrous xylene solution of monohaloalkyl with carbon mumber being 1-12 for 4 hours at normal temperature, after heating refluxing for 8 hours, directly raising temperature to separate out xylene and ethanol, adding water for layering to obtain tetrabasic ester shown as a general formula (2), carrying out basification and acidification on the tetrabasic ester to obtain tetrabasic carboxylic acid shown as a general formula (3), dissolving the tetrabasic carboxylic acid in pyridine, and heating for refluxing to obtain the dicarboxylic acid with the branch at the alpha position, shown as a general formula (4). The preparation method disclosed by the invention has the advantages that the used deacidification method is low in temperature, easy to control, and the obtained product is high in purity and is more than 99%, does not influence high temperature performance of the electrolyte. The preparation method is applied to a high-voltage capacitor, extremely small in electrical characteristics deterioration and high temperature electrical conductivity, and pretty high in high temperature spark.