218 results about "Tetrolic acid" patented technology

Provided is a liquid crystal alignment film which suppresses AC afterimage at a high level and which reduces charge accumulation and flicker due to backlight. The liquid crystal aligning agent contains the following polymer (A) and polymer (B). The polymer (A) is selected from the group consisting of polyimide precursors having formula (A1) and polyimides that are imides of the polyimide precursors. The polymer (B) is selected from the group consisting of polyimide precursors of formula (B1) and polyimides that are imides of the polyimide precursors, and the proportion of tetravalent organic groups represented by formula (X-10) is 40 mol% or more with respect to the total of 1 mol of tetracarboxylic acid residues of the polymer (B). # imgabs0 # (wherein the meaning of each symbol in the formula is as defined in the description. ) # imgabs1 # (* represents a bond).

The invention discloses an alkynyl functionalized hydrogen bond organic framework (HOF) material for efficient reverse separation of propylene / propane as well as a preparation method and application of the alkynyl functionalized hydrogen bond organic framework (HOF) material. The preparation method comprises the following steps: dissolving a tetracarboxylic acid type organic ligand H4L in a benign organic solvent to obtain an H4L solution, then placing the H4L solution in a poor solvent steam atmosphere, and obtaining an HOF material through a gas phase diffusion method; after a low-boiling-point reagent is adopted to carry out solvent exchange on the HOF material, solvent molecules in pore channels of the HOF material are removed through an activation method, and then the alkynyl functionalized HOF material for propylene / propane efficient reverse separation is obtained. The material shows the characteristics of high propane adsorption capacity, excellent propylene / propane reverse separation performance, good cycle performance, easy repair and reproducibility, fills the technical blank of the HOF material in the field of efficient reverse separation of propylene / propane mixed gas, and provides a brand new thought and technical support for research and development in the field of light hydrocarbon separation.

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)

To provide polyimide which is excellent in dimensional accuracy at high temperature while securing transparency, a method for producing a polyimide film, and a method for manufacturing a metal-clad laminate.SOLUTION: When a polyimide film is obtained by preparing a mixed solution containing a tetracarboxylic acid anhydride component, a diamine component, and an organic solvent, reacting the mixture and obtaining a solution of a polyamide acid, coating the solution onto a base material, drying the solution and obtaining a resin film, heat treating the resin film and imidizing the resin film, when the polyimide film is obtained by using a solvent containing a predetermined aprotic polar solvent and a predetermined amount of water as the organic solvent contained in the mixed solution, total light transmittance is 85% or more, polyimide having a thermal decomposition temperature (Td0.5) showing decrease in a weight of 0.5% of 460°C or higher is obtained.SELECTED DRAWING: None

Oral care compositions are disclosed that include a mixture of dentate ligands including mono-, di- and / or tetracarboxylic acid(s) as well as a stannous ion source and a fluoride ions source, such as stannous fluoride. Said oral care compositions show an ability to prevent and / or treat dental erosion and / or caries.

Oral care compositions are disclosed comprising a mixture of dentate ligands including mono-, di- and / or tetracarboxylic acid(s) as well as a stannous ion source and a fluoride ions source, such as stannous fluoride. Said oral care compositions show an ability to prevent and / or treat dental erosion and / or caries.

Oral care compositions are disclosed that include a mixture of dentate ligands including mono-, di- and / or tetracarboxylic acid(s) as well as a stannous ion source and a fluoride ions source, such as stannous fluoride. Said oral care compositions show an ability to prevent and / or treat dental erosion and / or caries.

To provide a new separation functional layer that is suitable for separating acidic gas from a mixed gas containing acidic gas.SOLUTION: A separation functional layer 1 of the present invention contains a polyimide P and porous particles. The polyimide P includes a structural unit A1 derived from a tetracarboxylic dianhydride having a six-membered acid anhydride structure. A separation membrane 10 of the present invention includes the separation functional layer 1 and a porous support 3 supporting the separation functional layer 1.SELECTED DRAWING: Figure 1

This maleimide resin is obtained by reacting a tetracarboxylic acid dianhydride (a1), a diamine (a2), a triamine (a3) and maleic anhydride (a4). The tetracarboxylic acid dianhydride (a1) includes a tetracarboxylic acid dianhydride having an aromatic ring. The diamine (a2) includes a dimer diamine and a second diamine other than a dimer diamine. The second diamine and / or the triamine includes an amine having an aromatic ring.

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 application discloses a uranium-based metal organic framework material and a preparation method and application thereof, and the chemical formula of the uranium-based metal organic framework material is [(UO2 2+ )(H2L 2‑ )·H2O] n , [(UO2 2+ )3(HL 3‑ )2(H2O)3·3H2O] n or [(UO2 2+ )(H2L 2‑ )·2H2O] n , wherein n is an integer greater than 0, and L is an aromatic tetracarboxylic acid. A series of uranium-based MOF materials are synthesized by using a solvent-thermal method, the X-ray stability of the MOF structure is significantly improved by using the strategy of preparing luminescent uranium-based MOF materials by using flexible carboxylic acid aromatic ligands, the prepared uranium-based MOF material has the advantages of diversified structure, stable property, excellent performance and wide application range, and the uranium-based MOF material is applied to the imaging field for the first time.

Oral care compositions are disclosed comprising a mixture of dentate ligands including mono-, di- and / or tetracarboxylic acid(s) as well as a stannous ion source and a fluoride ions source, such as stannous fluoride. Said oral care compositions show an ability to prevent and / or treat dental erosion and / or caries.

This polyimide resin has structural units A each derived from a tetracarboxylic dianhydride and structural units B each derived from a diamine. The structural units A include a structural unit (A1) derived from a compound represented by formula (a1) and a structural unit (A2) derived from a compound represented by formula (a2). The structural units B include a structural unit (B1) derived from a compound represented by formula (b1). The proportion of the structural unit (A2) in the structural units A is 27 mol% or less. The polyimide resin does not include a structural element (c). (In formula (c), X represents a fluorine atom, a hydrogen atom, or a carbon atom.)

The invention provides a liquid crystal aligning agent, a liquid crystal alignment film and a liquid crystal display element, wherein the liquid crystal aligning agent reduces deviation of torsion angles of liquid crystals, suppresses flicker and has high transmittance. The liquid crystal aligning agent contains: a polymer (A): a polyamic acid (A) having a structural unit derived from a tetracarboxylic acid derivative including a structural unit represented by formula (1Ta) and a structural unit derived from a diamine including a structural unit represented by formula (1Da), wherein at least a part of the terminal of the polyamic acid (A) contains a non-amino group as a functional group represented by formula (E); polymer (B): a polyamic acid (B) having a structural unit derived from a tetracarboxylic acid derivative including a structural unit represented by formula (1Tb) and a structural unit derived from a diamine. The present invention is characterized by comprising, as constituent units derived from a diamine, a constituent unit represented by formula (1Db1), a constituent unit represented by formula (1Db2), and a constituent unit represented by-N (Z)-YU-N (Z)-(YU represents a divalent organic group having a urea bond). # imgabs0 #

The embodiment of the invention relates to a negative electrode material and a preparation method thereof, a negative electrode plate and a battery, and the preparation method of the negative electrode material comprises the following steps: S1, uniformly mixing a single-layer MXene suspension and a resin prepolymer dispersion liquid, adding perylene-2, 5, 8, 11-tetracarboxylic acid, and uniformly stirring to obtain a precursor solution; s2, performing hydrothermal reaction on the precursor solution to obtain a carbon precursor; and S3, performing carbonization treatment on the carbon precursor in a protective gas atmosphere to obtain the negative electrode material. Therefore, the first efficiency, the capacity performance and the cycle performance of the negative electrode material can be effectively improved.

The present invention provides a liquid crystal aligning agent that can form a liquid crystal alignment film having excellent mechanical properties, and can provide a liquid crystal element that exhibits good liquid crystal alignment properties, a high voltage holding ratio, and excellent reliability. [Solution] A liquid crystal aligning agent contains polymer (A), which is at least one selected from the group consisting of polyamic acid, polyamic acid ester, and polyimide, and is obtained using two or more tetracarboxylic acid derivatives including a compound represented by formula (1), and satisfies at least one of requirements 1 and 2. Requirement 1: Further, polymer (B) different from polymer (A) is contained. Requirement 2: Two or more types of polymer (A) are contained. In formula (1), Y 1 and Y 2 are each independently a tetravalent organic group. 1 is a divalent organic group. TIFF0007758236000037.tif24168

The multilayer polyimide film (10) has a non-thermoplastic polyimide layer (11) and a thermoplastic polyimide layer (12) disposed on at least one surface of the non-thermoplastic polyimide layer (11). A non-thermoplastic polyimide contained in the non-thermoplastic polyimide layer (11) has, as a tetracarboxylic acid dianhydride residue, a tetracarboxylic acid dianhydride residue containing a benzophenone skeleton, and has, as a diamine residue, a diamine residue containing a biphenyl skeleton. Furthermore, in the multilayer polyimide film (10), the content of diamine residues containing a biphenyl skeleton in the non-thermoplastic polyimide is 30-100 mol% with respect to the total diamine residues constituting the non-thermoplastic polyimide.

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 polyimide resin has a constituent unit A derived from tetracarboxylic acid dianhydride and a constituent unit B derived from a diamine, wherein the constituent unit A includes a constituent unit (A1) derived from a compound represented by formula (a1), the constituent unit (A1) includes 35 mol% or more of a trans structure derived from (1R,2S,4S,5R)-cyclohexanetetracarboxylic acid dianhydride, the constituent unit B includes a constituent unit (B1) derived from a compound represented by formula (b1), and the polyimide resin does not include the structural element (c). In formula (c), X is a fluorine atom, a hydrogen atom, or a carbon atom.

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.

Oral care compositions are disclosed comprising a mixture of dentate ligands including mono-, di- and / or tetracarboxylic acid(s) as well as a stannous ion source and a fluoride ions source, such as stannous fluoride. Said oral care compositions show an ability to prevent and / or treat dental erosion and / or caries.

The present invention discloses a perylene tetracarboxylic acid ester fluorescent probe for detecting fluoride ions and a detection method thereof, belonging to the technical field of analytical chemistry. The perylene tetracarboxylic acid ester fluorescent probe contains a copper ion and bipyridine-like complex structure and an O-H group. The fluorescent probe of the present invention is simple to synthesize and convenient to use. The coordination effect of copper ions enhances the ability of the O-H group to donate protons, and can specifically react with fluoride ions. Chloride ions, bromide ions, iodide ions, sulfate ions, acetate ions, perchlorate ions and dihydrogen phosphate ions have no obvious interference on the determination of fluoride ion concentration, and have the characteristics of good selectivity and high sensitivity.

The invention discloses high-modulus impact-resistant modified asphalt, which is mainly prepared from the following components in parts by weight: 2 to 7 parts of 2-(2-ethoxyl)-3A, 4, 7, 7A-tetrahydro-1H-4, 7-methoxy isoindole-1, 3 (2H)-diketone, 2 to 9 parts of gamma-phenyl-epsilon-caprolactone, 85 to 90 parts of matrix asphalt, 0.0003 to 0.0007 part of tricyclic [6.4.0.02, 7] dodecane-1, 8: 2, 7-tetracarboxylic acid dianhydride, and 0.001 to 0.003 part of stannous octoate (per mil). The invention also provides a preparation method of the high-modulus impact-resistant modified asphalt. The invention also provides an asphalt mixture. The invention also provides application of the asphalt mixture as a road building material in road maintenance or road construction. According to the high-modulus impact-resistant modified asphalt provided by the invention, gamma-phenyl-epsilon-caprolactone completes chain propagation, unreacted hydroxyl at the tail end and carboxylic acid groups newly generated after ring opening of tricyclic [6.4. 0.02, 7] dodecane-1, 8: 2, 7-tetracarboxylic dianhydride can form a large number of hydrogen bonds with ester groups on a long chain, so that network structures have stronger acting force, and the impact resistance of the asphalt is improved. And the impact resistance and energy absorption performance are higher.

Provided are: a liquid crystal aligning agent which exhibits excellent printability, has a high voltage retention rate, and can yield a liquid crystal alignment film having a low accumulated charge amount; a liquid crystal alignment film obtained from the liquid crystal aligning agent; and a liquid crystal display element obtained using the liquid crystal alignment film.　The liquid crystal aligning agent is characterized by containing a polymer (A) and component (B).　Polymer (A) is 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 imidated polymer that is an imidated product of the polyimide precursor. The polymer contains a structural unit (a-1Ta) represented by formula (1Ta) as the structural unit derived from a tetracarboxylic acid derivative and contains a structural unit (a-1Da) represented by formula (1Da) as the structural unit derived from a diamine.　Component (B) is a compound (B) represented by formula (1). (Meanings of symbols in formula (1Ta) are as defined in the description.) (Meanings of symbols in formula (1Da) are as defined in the description.) Component (B) is a compound (B) represented by formula (1) (meanings of symbols in formula (1) are as defined in the description).

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.)