76 results about "Tetrolic acid" patented technology

Provided are: a liquid crystal aligning agent which contains two or more polyamic acids and in which deterioration in liquid crystal aligning properties when stored at room temperature is suppressed; a liquid crystal alignment film obtained from the liquid crystal aligning agent; and a liquid crystal display element. The liquid crystal aligning agent is characterized by containing the following polymer (A) and polymer (B). Polymer (A): a polyamic acid (A) having a structural unit derived from a tetracarboxylic acid derivative and a structural unit derived from a diamine, the polyamic acid containing, as the structural unit derived from the tetracarboxylic acid derivative, a structural unit (a-1Ta) represented by formula (1Ta), and containing, as the structural unit derived from the diamine, a structural unit (a-1Da) represented by formula (1Da), at least a part of the terminal of the polyamic acid (A) contains a non-amino group, the non-amino group is a functional group represented by structural formula (E), and the presence rate of the terminal amino group in the polyamic acid (A) is 60% or less based on the total terminal of the polyamic acid (A). Polymer (B): a polyamic acid (B) having a structural unit derived from a tetracarboxylic acid derivative and a structural unit derived from a diamine, the polyamic acid including a structural unit (b-1Tb) represented by formula (1Tb) as the structural unit derived from the tetracarboxylic acid derivative, and including a structural unit (b-1Db) represented by formula (1Db) as the structural unit derived from the diamine. (Definition of each symbol is as defined in the specification) (Definition of each symbol is as defined in the specification) (Definition of each symbol is as defined in the specification) (Definition of each symbol is as defined in the specification)

Provided are: a liquid crystal aligning agent which contains two or more types of polyamic acids and which suppresses variations in the pretilt angle of a liquid crystal aligning film when stored at room temperature; a liquid crystal aligning film obtained from the liquid crystal aligning agent; and a liquid crystal display element. The liquid crystal aligning agent is characterized in that the liquid crystal aligning agent can form a liquid crystal alignment film with a pretilt angle of more than 0 degree and less than 3 degrees, and the liquid crystal aligning agent contains the following polymer (A) and polymer (B) or the following polymer (B) and polymer (B '). (Here, polymer (A) does not include polymer (B)) Polymer (A): a polyamic acid (A) having a structural unit derived from a tetracarboxylic acid derivative and a structural unit derived from a diamine, the polyamic acid containing, as the structural unit derived from the tetracarboxylic acid derivative, a structural unit (a-1Ta) represented by formula (1Ta) and containing, as the structural unit derived from the diamine, a structural unit (a-1Da) represented by formula (1Da). Polymer (B): a polyamic acid (B) having a structural unit derived from a tetracarboxylic acid derivative and a structural unit derived from a diamine, the polyamic acid containing, as the structural unit derived from the tetracarboxylic acid derivative, a structural unit (b-1Tb) represented by formula (1Tb), and containing, as the structural unit derived from the diamine, a structural unit (b-1Db) represented by formula (1Db). At least a part of the terminal of the polyamic acid (B) contains a non-amino group, the non-amino group is a functional group represented by structural formula (E), and the presence rate of the terminal amino group in the polyamic acid (B) is 60% or less based on the total terminal of the polyamic acid (B). Polymer (B '): a polyamic acid (B') having a structural unit derived from a tetracarboxylic acid derivative and a structural unit derived from a diamine, the polyamic acid containing a structural unit (b-1Tb) represented by formula (1Tb) as the structural unit derived from the tetracarboxylic acid derivative and not containing a structural unit (a-1Da) represented by formula (1Ta), and the polyamic acid containing a structural unit (b-1Da) represented by formula (1Ta) as the structural unit derived from the diamine as the structural unit derived from the diamine. The polyamic acid (B) contains a structural unit (b-1Db) represented by formula (1Db) or a structural unit (b-1Db ') represented by formula (1Db'), and the content of terminal amino groups in the polyamic acid (B ') is greater than 60% based on the total terminals of the polyamic acid (B). (Definition of each symbol is as defined in the specification) (Definition of each symbol is as defined in the specification) (Definition of each symbol is as defined in the specification) (Definition of each symbol is as defined in the specification) .

Disclosed are oral care compositions comprising: a tooth ligand mixture comprising a monocarboxylic acid, a dicarboxylic acid, and / or a tetracarboxylic acid; and a stannous ion source and a fluoride ion source, such as stannous fluoride. The oral care compositions show the ability to prevent and / or treat dental erosion and / or dental caries.

The invention relates to a liquid crystal aligning agent, a liquid crystal alignment film, a manufacturing method of the liquid crystal alignment film, a liquid crystal element and a compound. A liquid crystal aligning agent which contains a polymer (A) that is at least one selected from the group consisting of polyamic acids, polyamic acid esters and polyimides and is obtained using two or more tetracarboxylic acid derivatives containing compounds represented by formula (1), and which satisfies at least one of requirements 1 and 2. Condition 1: In addition, a polymer (B) different from the polymer (A) is contained. Requirement 2: Two or more polymers (A) are contained. In formula (1), Y1 and Y2 independently represent a tetravalent organic group. And X1 represents a divalent organic group.

A polyamide acid according to the present invention includes a tetracarboxylic acid dianhydride residue and a diamine residue. The tetracarboxylic acid dianhydride residue includes a 3,3',4,4'- biphenyltetracarboxylic acid dianhydride residue. The diamine residue includes a p-phenylenediamine residue and a siloxane diamine residue. At least one of the tetracarboxylic acid dianhydride residue and the diamine residue further includes a residue derived from a compound in which a plurality of aromatic rings are linked via a linking group. The linking group is one or more items selected from the group consisting of ether groups and ester groups.

The application discloses a kind of water resistance of polyimide orientation agent improvement, the orientation agent is modified polyimide, which is at least one compound containing as polymer by diamine and tetracarboxylic dianhydride reaction obtained polyamide acid by imidization to obtain polyimide;The affinity or compatibility of the modified polyimide of the application to water has been significantly improved, and polyimide precipitation or hydrolysis is not easy to cause, which can effectively solve the problem that the spray machine is more likely to cause spraying disorder or hole blocking when switching PI liquid in tank or idle during mass production, so as to achieve the purpose of improving the effect of PI orientation agent Inkjet. It has practical application value.

The invention discloses a preparation method of a covalent organic framework photocatalyst for photocatalytic reduction of CO2, which comprises the following steps: adding 4, 4 ', 4' '-(1, 3, 5-triazine-2, 4, 6-triyl) triphenylamine and 2, 5-dibromobenzene-1, 2, 4, 5-tetracarboxylic dianhydride into a reaction kettle, then adding 1-hydroxy-3-methylbenzene and isoquinoline, and uniformly mixing; and carrying out microwave heating on the reaction kettle, cooling to room temperature, filtering, collecting precipitate, washing, and then carrying out Soxhlet extraction and vacuum drying to obtain the covalent organic framework photocatalyst. A surface halogen atom modification strategy is designed and used for regulating and controlling electron distribution and light capture capacity of a donor-acceptor (D-A) in TzPm-COF, and results show that the strategy can effectively improve photocatalytic activity and selectivity of reduction of CO2 into CO, and can be applied to preparation of the TzPm-COF catalyst. A reasonable design strategy is provided for developing a functional modified COFs material for efficiently and selectively photocatalytic CO2 reduction.

This method for producing a polyimide precursor comprises: a step for reacting a tetracarboxylic acid compound and a diamine compound in the presence of an organic dehydrating agent to obtain a polyimide precursor containing a polymerizable unsaturated bond; and a step for bringing the polyimide precursor into contact with an acid.

This invention provides a liquid crystal alignment agent, a liquid crystal alignment film, and a liquid crystal display element. The resulting liquid crystal display element exhibits low flicker after being driven. The liquid crystal alignment agent comprises a polymer (A) and a solvent (B). The polymer (A) is prepared by polymerization of a mixture comprising a tetracarboxylic dianhydride component (a) and a diamine component (b), and has a structure as shown in formula (I).

The object of the present invention is to provide a resin composition that is heat-curable or photocurable, alkali-soluble, has a low dielectric constant and dielectric loss tangent of the cured product, and exhibits high adhesion and glass transition temperature, as well as excellent insulation reliability. [Solution] A resin composition is used that contains a compound represented by the following formula (1) and a compound containing one or more epoxy groups in one molecule. TIFF2026103975000012.tif29170 (In formula (1), each X independently represents a residue of an aromatic or aliphatic tetracarboxylic anhydride with the carboxyl group removed. Y represents a divalent residue of a diol with the hydroxyl group removed. Each Z independently represents a residue of a functional group containing a radically polymerizable double bond. n is the average number of repeating units and is a real number between 0.1 and 20.)

The present invention provides a composition that is for formation of a flexible device substrate and that can form a resin thin film which has transparency even without containing fluorine atoms, which has high heat resistance, and which exhibits good adhesion to an inorganic insulating film when an electrode is formed on a polyimide.　Provided is a composition for formation of a flexible device substrate, said composition comprising a component (A) and a component (C).　The component (A) is a polyimide precursor which has a tetracarboxylic dianhydride having a structure represented by formula (0-t) or a structure t0 derived from a derivative thereof, and / or a structure d0 derived from a diamine having a structure represented by formula (0-d), and which does not contain a fluorine atom. The component (C) is a specific compound represented by formula [1].

The present application provides a liquid crystal alignment agent, a liquid crystal alignment film, and a liquid crystal display element, which can reduce the deviation (non-uniformity) of the twist angle of liquid crystals in the in-plane of a liquid crystal alignment film even when the amount of light irradiation in an alignment treatment by a photo-alignment method is small. The liquid crystal alignment agent contains a polymer (A). The polymer (A) is a polymer selected from the group consisting of a polyimide precursor having a structural unit derived from a tetracarboxylic acid derivative and a structural unit derived from a diamine, and an imidized polymer which is an imidized product of the polyimide precursor, contains at least one structural unit selected from the group consisting of a structural unit (a-1Ta) and an esterized derivative of the structural unit (a-1Ta) represented by formula (1T a ), as the structural unit derived from the tetracarboxylic acid derivative, and contains a structural unit (a-1Da1) represented by formula (1D a1 ) and a structural unit (a-1Da2) represented by formula (1D a2 ), as the structural unit derived from the diamine. (The definitions of the symbols are described in the description.) (The definitions of the symbols are described in the description.)

The invention discloses a diamine monomer with a side chain containing tertiary butyl and a preparation method and application thereof.The diamine monomer is special in structure, polyesteramide or polyimide can be prepared through reaction of the diamine monomer and a tetracarboxylic acid derivative, the obtained polyesteramide is narrow in molecular weight distribution, the molecular chain is provided with the special structure introduced by the diamine monomer, and the molecular chain is not prone to being damaged. The resin prepared by the preparation method not only has good dissolution film-forming property, but also has excellent dielectric property and lower water absorption property, is high-performance resin, and is widely applied to the fields of communication electronics and aerospace.

The invention discloses a synthesis method of 9, 9-bis (trifluoromethyl)-2, 3, 6, 7-xanthene tetracarboxylic dianhydride, which comprises the following steps: (1) carrying out condensation reaction on N-methyl-4-nitrophthalimide and hexafluoroacetone trihydrate under the catalysis of trifluoromethanesulfonic acid to obtain a first intermediate; (2) performing catalytic etherification reaction on the first intermediate in the presence of sodium nitrite to obtain a second intermediate; (3) carrying out hydrolysis reaction on the second intermediate under an alkaline condition to obtain a third intermediate; and (4) dehydrating the third intermediate into anhydride to obtain 9, 9-bis (trifluoromethyl)-2, 3, 6, 7-xanthene tetracarboxylic dianhydride. According to the method, raw materials are low in price and easy to obtain, the reaction yield and the product purity are high, particularly, the situation that potassium permanganate oxidation or nitric acid oxidation is insufficient in the prior art is avoided, and the method is higher in safety, more environmentally friendly and suitable for large-scale industrial production.

This invention provides a novel liquid crystal alignment agent capable of producing a liquid crystal alignment film with excellent film strength and few vibration bright spots, a liquid crystal alignment film obtained from the liquid crystal alignment agent, a liquid crystal display element using the liquid crystal alignment film, and novel compounds and polymers applicable to them. A liquid crystal alignment agent, comprising a polymer (P), said polymer (P) being at least one selected from the group consisting of a tetracarboxylic acid component comprising at least one selected from the group consisting of a tetracarboxylic acid dianhydride and its derivatives, and a diamine component comprising a diamine represented by the following formula (2), and a polyimide as an imide derivative of said polyimide precursor. (The meanings of the symbols in the above formulas are as defined in the specification.)

The invention discloses a hydrogen bond organic framework material for separating ethane and ethylene and a preparation method of the hydrogen bond organic framework material. The invention provides a hydrogen bond organic framework material formed by hydrogen bond self-assembly of specific tetracarboxylic acid organic monomers, the chemical formula of the hydrogen bond organic framework material is C56H40N2O8, the hydrogen bond organic framework material belongs to an orthorhombic system, and the space group is Ima. The preparation method of the material comprises synthesis of an organic monomer and crystal culture and activation in a solvent through a steam diffusion method. The hydrogen bond organic framework material has a high specific surface area, the BET specific surface area can reach 2865 m < 2 > / g, ethane can be preferentially and selectively adsorbed from ethane / ethylene mixed gas, efficient separation of ethane and ethylene is achieved, and the material is stable in structure and easy to regenerate and has a wide application prospect in the field of low-carbon hydrocarbon separation.

The present application provides a kind of polyimide precursor, polyimide, its preparation method and application.The polyimide precursor has the repeat unit structure shown in formula I, the polyimide has the repeat unit structure shown in formula II:Wherein, R a It represents the residue of tetracarboxylic dianhydride component, and the residue of tetracarboxylic dianhydride component includes the residue of 9,9-bis(3,4-dicarboxyphenyl) fluorene dianhydride component;R b It represents the residue of aromatic diamine. The polyimide formed by the polyimide precursor, or the polyimide having the repeat unit shown in formula II has good solubility in various solvents, thereby giving it good processability; and the polyimide film provided by the present application has higher light transmittance, lower yellowness index, excellent thermal stability, higher glass transition temperature and good mechanical properties.

The present disclosure relates to a polyamide acid comprising diamine units and tetracarboxylic acid units, at least one selected from the diamine units and the tetracarboxylic acid units comprising a unit (X) having a group (X) comprising at least one non-aromatic hydrocarbon group, and the total carbon number of the at least one non-aromatic hydrocarbon group is 9 or more, and the content of the unit (X) is 12.0 mol% or more, based on the total amount of the diamine units and the tetracarboxylic acid units.

The present invention aims to provide polyimides and molded articles such as films that are environmentally safe, soluble in organic solvents, and have excellent transparency and mechanical properties. [Solution] The above problem can be solved by a polyimide having a tetracarboxylic dianhydride component and a diamine component, wherein the diamine component includes a fluorine atom-containing diamine having a CF3-O- structure selected from 2,2'-bis(trifluoromethoxy)benzidine, 3,3'-bis(trifluoromethoxy)benzidine, and / or 2,3'-bis(trifluoromethoxy)benzidine, and the tetracarboxylic dianhydride component includes an acid dianhydride having an ether bond and an alicyclic tetracarboxylic dianhydride.

The polyamic acid composition contains a polyamic acid and an organic solvent. The polyamic acid has a tetracarboxylic dianhydride residue and a diamine residue. The tetracarboxylic dianhydride residue includes a 3,3′,4,4′-biphenyltetracarboxylic dianhydride residue and a spiro[11H-difuro[3,4-b:3′,4′-i]xanthene-11,9′-[9H]fluorene]-1,3,7,9-tetrone residue. The diamine residue includes a p-phenylenediamine residue. At least one of the tetracarboxylic dianhydride residue or the diamine residue further includes a residue having an ester bond. At least one of the tetracarboxylic dianhydride residue or the diamine residue further includes a residue having a diphenyl ether structure.

This invention provides a liquid crystal alignment film that suppresses AC retention even when applied in a low-temperature firing process and when the light irradiation during alignment by photo-alignment is low. Furthermore, it provides a liquid crystal alignment film with good in-plane uniformity of contrast. A liquid crystal alignment agent, comprising: a polymer (P), said polymer (P) being at least one selected from the group consisting of a tetracarboxylic acid component comprising at least one selected from the group consisting of a tetracarboxylic acid dianhydride and its derivatives as shown in formula (1), a diamine component comprising a diamine as shown in formula (2-1), a diamine as shown in formula (2-2), and a diamine as shown in formula (2-3), and a polyimide as an imide derivative of said polyimide precursor. (The meanings of the symbols in the above formulas are as defined in the specification.)

This invention provides a multilayer polyimide film with excellent heat resistance, low dielectric loss tangent, and dimensional stability. The multilayer polyimide film comprises a heat-resistant polyimide layer and a heat-fusion polyimide layer laminated on one or both sides; the heat-resistant polyimide is obtained from a tetracarboxylic acid component containing more than 75 mol% of 3,3',4,4'-biphenyltetracarboxylic dianhydride (s-BPDA) and less than 25 mol% of pyromellitic dianhydride (PMDA), and a diamine component containing 70 mol% to 95 mol% of p-phenylenediamine and 5 mol% to 30 mol% of 2,2'-dimethylbenzidine; the heat-fusion polyimide is obtained from a tetracarboxylic acid component containing 10 mol% to 60 mol% of s-BPDA and 40 mol% to 90 mol% of PMDA, and a diamine component containing more than 50 mol% of 2,2-bis[4-(4-aminophenoxy)phenyl]propane.

The present invention relates to: a polyimide which comprises a diamine component and a tetracarboxylic acid dianhydride component; and a benzidine derivative which can be used as a monomer component for the polyimide. The polyimide may be a polyamide-imide which has an amide structural unit that is formed by bonding of the diamine component and a polybasic acid component. The polyimide contains, as the diamine component, a benzidine derivative in which at least one hydrogen atom on the two benzene rings of benzidine is substituted with a difluoromethyl group.

The invention relates to a method for producing a MOF, wherein a MOF is a structured metal-organic compound comprising a bi- or tri-dimensional porous network consisting of inorganic entities that are connected by polydentate chelating ligands bonded to multiple metal centers; the polydentate chelating ligands being selected in particular from the group comprising C5-C24 heteroaromatic ligands and aromatic ligands, comprising at least one carboxylic acid function, preferably benzyl or naphthyl di-, tri- or tetracarboxylate, and the aromatic or heteroaromatic ligands optionally bearing, on at least one aromatic ring, a group selected from among —NH2, —OH, —CH3, —NO2, —CF3, —COOH, —SO3H, —SH, —OCH3.

A resin composition comprising: a polyimide precursor, which is a reaction product of an aromatic tetracarboxylic acid dianhydride and an aromatic diamine; an organic solvent; and an amine compound, wherein the pKa of the conjugate acid of the amine compound is less than 11 and the molecular weight of the amine compound is greater than 70.

The invention relates to stoichiometric salts of tetracarboxylic acids and diamines of the general formula (I) wherein R1 is selected from the group consisting of tetravalent residues of butane, cyclobutane, cyclopentane, cyclohexane, tetrahydrofuran and benzophenone and R2 is selected from the group consisting of divalent residues of unbranched, branched or cyclic aliphatic hydrocarbons having 3 to 15 carbon atoms, with the proviso that the salts of the formula (I) are water-soluble and are selected from the group consisting of compounds (1) to (28); and to polyimides prepared from these salts by polycondensation.

Provided is a polyimide resin precursor varnish containing a solvent and a polyimide resin precursor having a constituent unit A derived from a tetracarboxylic dianhydride and a constituent unit B derived from a diamine, wherein the constituent unit A includes at least one constituent unit selected from the group consisting of a constituent unit derived from a compound represented by formula (a11) and a constituent unit (A12) derived from a compound represented by formula (a12), the constituent unit B includes a constituent unit derived from a compound represented by formula (b1), and the solvent includes a solvent having a boiling point of 190°C-250°C and a solvent having a boiling point of 110°C-160°C. (In the formulas, X is a sulfone group or the like, and Y is a hexafluoroisopropylidene group or a fluorenylidene group.)

Provided is a liquid crystal alignment agent capable of obtaining a liquid crystal alignment film having high adhesion between the liquid crystal alignment film and a sealant and high in-plane uniformity of liquid crystal alignment restriction force, the liquid crystal alignment film, and a liquid crystal display element using the liquid crystal alignment film. A liquid crystal alignment agent containing a polymer (P) which is at least one selected from the group consisting of a polyimide precursor obtained using a tetracarboxylic acid component containing at least one selected from the group consisting of tetracarboxylic dianhydride and derivatives thereof and a diamine component containing a diamine represented by the following formula (2), and a polyimide which is an imidization product of the polyimide precursor. (The meanings of the symbols in the above formula are defined in the description.)

A polyimide binder from which a high-capacity power storage device, which has a small irreversible capacity and a high initial charge / discharge efficiency and is lightweight, can be obtained. The polyimide binder precursor composition is a polyimide binder precursor composition for a power storage device electrode, and includes a reaction product of a tetracarboxylic acid component and a diamine component, and a solvent. The polyimide binder obtained from the polyimide binder precursor composition has an irreversible capacity of 1200 mAh / g or less.

The present disclosure pertains to a polyamic acid that includes diamine units and tetracarboxylic acid units. At least one selected from the group consisting of the diamine units and the tetracarboxylic acid units includes at least one nonaromatic hydrocarbon group and includes a unit (X) having a group (X) in which the total number of carbon atoms of the at least one nonaromatic hydrocarbon group is 9 or more. The percentage content of the unit (X) is 12.0 mol% or more based on the total amount of the diamine units and the tetracarboxylic acid units.