357 results about "Tetrolic acid" patented technology

A solvent cast film comprises a polyimide comprising structural units derived from polymerization of a dianhydride component comprising a dianhydride selected from the group consisting of 3,4′-oxydiphthalic dianhydride, 3,3′-oxydiphthalic dianhydride, 4,4′-oxydiphthalic dianhydride, and combinations thereof, with a diamine component wherein the polyimide has a glass transition temperature of at least 190° C.; wherein the film has a coefficient of thermal expansion of less than 60 ppm / ° C., a thickness from 0.1 to 250 micrometers, and less than 5% residual solvent by weight; wherein the polyimide has less than 15 molar % of structural units derived from a member selected from the group consisting of biphenyltetracarboxylic acid, a dianhydride of biphenyltetracarboxylic acid, an ester of biphenyltetracarboxylic acid, and a combination thereof.

An article comprises a solvent cast film comprising a polyetherimide comprising structural units derived from a dianhydride component selected from the group consisting of 3,4′-oxydiphthalic anhydride, 3,3′-oxydiphthalic anhydride, 4,4′-oxydiphthalic anhydride, and combinations thereof, and a diamine component. The polyetherimide has a glass transition temperature that is at least 190° C. The film has a coefficient of thermal expansion of less than 60 ppm / ° C., a thickness from 0.1 to 250 micrometers, and less than 5% residual solvent by weight. The film has less than 15 molar % of a member selected from the group consisting of biphenyltetracarboxylic acid, dianhydrides of biphenyltetracarboxylic acid, esters of biphenyltetracarboxylic acid, and combinations thereof.

Provided are a polyimide that demonstrates low coefficient of hygroscopic expansion and low water absorption coefficient when used as an insulation film, as well as an ester group-containing tetracarboxylic acid dianhydride expressed by the general formula below, and a novel polyesterimide precursor derived therefrom and polyesterimide, for use in the production of such polyimide:In the formula, each R is independent and represents a straight or branched-chain alkyl group with 1 to 6 carbon atoms or straight or branched-chain alkoxyl group with 1 to 6 carbon atoms, n is an integer of 0 to 4, and m is an integer of 2 to 4, with the proviso that if m=2, n is an integer of 1 to 4.

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.

Addition-cured polyimides that contain the reaction product of an aromatic triamine or trianhydride analogue thereof, a reactive end group such as 5-norbornene-2, 3-dicarboxylic acid, ester derivatives of 5-norbornene-2,3-dicarboxylic acid, anhydride derivatives of 5-norbornene-2,3-dicarboxylic acid, or 4-phenylethynylphthalic anhydride, an aromatic diamine, and a dialkyl ester of an aromatic tetracarboxylic acid. The resultant starlike polyimides exhibit lower melt flow viscosity than its linear counterparts, providing for improved processability of the polyimide. Also disclosed are methods for the synthesis of these polyimides as well as composite structures formed using these polyimides.

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.

A black perylene-based pigment produced by calcining at least one compound selected from the group consisting of diimide derivatives of perylene tetracarboxylic acid and diimide derivatives of perylene diiminodicarboxylic acid, at a temperature of 200 to 600° C. in vacuum or in an inert gas atmosphere, exhibits an excellent blackness, an excellent heat resistance and an excellent weather fastness as well as a high resistance and a high safety.

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.

The polyimide precursor composition of the present invention is characterized in comprising a polyimide precursor having a structure formed by reacting a diamine component (A) containing a fluorine-containing aromatic diamine (a1) represented by the following chemical formula (I)(in the formula (I), R1 and R2 are each independently selected from —H, —(CF2)n—CF3, and —O(CF2)n—CF3 (n is an integer of 0 or more and 7 or less), and at least one of R1 and R2 is a fluorine-containing group) and trans-1,4-cyclohexyldiamine (a2) with an acid dianhydride component (B) containing an aliphatic tetracarboxylic dianhydride (b1) and an aromatic tetracarboxylic dianhydride (b2). Use of the composition of the present invention provides a polyimide film and a transparent flexible film having high transparency, low thermal expansion properties, low birefringent properties, and high heat resistance.

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 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.

Disclosed is a highly heat-resistant thermosetting polyimide resin composition having long pot life, which enables to obtain a cured product having flexibility and adhesiveness. The thermosetting polyimide resin composition can be obtained through the following steps (1)-(3). Step (1): A step wherein a polyimide (A) is synthesized by a thermal reaction by blending a tetracarboxylic acid component, which is composed of a tetracarboxylic acid dianhydride represented by the formula (1) and one or more compounds selected from tetracarboxylic acids represented by the formula (2) and derivatives of such tetracarboxylic acids, with an aliphatic diamine represented by the formula (3) in such a ratio that the mole number of the tetracarboxylic acid component is higher than the mole number of the aliphatic diamine. Step (2): A step wherein a polyimide (B) is synthesized by a thermal reaction by blending the polyimide (A) obtained in the step (1) with an aromatic diamine represented by the formula (4). Step (3): A step wherein the polyimide (B) obtained in the step (2) is blended and mixed with a bismaleimide compound represented by the formula (5).

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

A black perylene-based pigment produced by calcining at least one compound selected from the group consisting of diimide derivatives of perylene tetracarboxylic acid and diimide derivatives of perylene diiminodicarboxylic acid, at a temperature of 200 to 600° C. in vacuum or in an inert gas atmosphere, exhibits an excellent blackness, an excellent heat resistance and an excellent weather fastness as well as a high resistance and a high safety.

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.

A thermoplastic polyimide having good processing characteristics, obtainable by polymerizing an acid component and a diamine component, wherein an aromatic tetracarboxylic acid dianhydride represented by formula (I): or its derivative is used at least as a part of the acid component.

The invention relates to a polyamide acid composition with the viscosity capable of being controlled and a preparation method and application thereof. The problems that in the prior art, controlling of the viscosity is unstable in the preparation process of a polyamic acid solution, and further lengthening of a polymer molecular chain is difficult in the subsequent imidization process are solved. The preparation method for the polyamide acid composition comprises the following steps that (a) tetracarboxylic acid and diamine are stirred in an organic solvent at the low temperature of minus 10-40 DEG C and evenly mixed, and thus a composition solution of tetracid and the diamine is obtained; and (b) tetracarboxylic acid dianhydride is added into the composition solution of the tetracid and the diamine and stirred for reaction at the low temperature of minus 10-40 DEG C. The problems are solved through the technical scheme for obtaining the polyamide acid composition, controlling of the viscosity of the polyamic acid solution and further lengthening of the polymer molecular chain in the subsequent imidization process are achieved, and the polyamide acid composition with the viscosity capable of being controlled and the preparation method can be applied to industrial production of polyimide materials.

An object of the present invention is to provide (i) a polyimide precursor composition which is curable at a low temperature (not more than 250° C.) and which has a low viscosity despite having a high concentration, and a production method thereof, (ii) a polyimide coating film obtained from the polyimide precursor composition and having good properties, and a production method thereof, (iii) a photosensitive resin composition prepared by use of the polyimide precursor composition, and a production method thereof. The object of the present invention can be attained by a polyimide precursor composition containing an imidized tetracarboxylic acid having a specific structure and an isocyanate compound having a specific structure, or optionally a diamine.

The invention belongs to the field of catalysis of porous composite materials, and particularly relates to a mesoporous metal-organic framework multi-center catalyst as well as a preparation method and application thereof. Zirconium-oxygen clusters are used as nodes, and tetracarboxylic acid metalloporphyrin is used as an organic chain to construct a rod-like (hexagonal) or cubic crystal; the metal organic framework material is formed by self-assembling zirconium oxygen clusters and tetracarboxylic acid metalloporphyrin at a certain temperature through coordination; the metal organic frameworkmaterial has a large pore size, a high specific surface area and excellent thermal stability and chemical stability. Through a post-modification method, stannous chloride can be loaded on the zirconium oxide cluster to obtain the mesoporous metal organic framework multi-catalytic center catalyst. The catalyst material can efficiently convert glucose into 2,5-furandicarboxylic acid under a photo-thermal condition.

The invention discloses a method for detecting a photoelectric chemical sensor for mercury ion detection. The construction method of the photoelectric chemical sensor comprises the following steps of: (1) cleaning a glassy carbon electrode, dispensing a photo-anode perylene tetracarboxylic / graphene heterojunction suspension on the surface of the glassy carbon electrode, and drying at room temperature; (2) fixing an aminated T base to the surface of the electrode subjected to EDC-NHS activated treatment; (3) dispensing to-be-detected mercury ions and interfering ions of different concentrations on different electrodes or on the surface of the same electrode in different times respectively; and (4) dispensing a mixed solution of hydroxylamine and chloroauric acid on the surface of the electrodes dispensed with the mercury ions, and forming nanogold on the surface of the electrode by utilizing catalysis of the mercury ions. The photoelectric chemical sensor prepared by the method has the characteristics of high ultra-sensitiveness, high specificity, low cost, simpleness and convenience in operation, easiness in carrying, low detection limit of 2pmolL<-1> and the like.

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.

Provided is a composition for forming a release layer, which comprises a polyamic acid produced by reacting an aromatic diamine with an aromatic tetracarboxylic dianhydride and an organic solvent, wherein the aromatic diamine comprises an aromatic diamine containing an ester bond and / or an ether bond and / or the aromatic tetracarboxylic dianhydride contains an ester bond and / or an ether bond.