156 results about "Tetrolic acid" patented technology

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

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

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.

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 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.

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.)

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 present invention provides a liquid crystal aligning agent which enables the achievement of a liquid crystal alignment film that has a high voltage holding ratio and a high film hardness and is capable of suppressing an AC afterimage.　The liquid crystal aligning agent is characterized by containing the polymer (A) and the component (B) described below.　Polymer (A): A polymer which is selected from the group consisting of a polyimide precursor that has a structural unit derived from a tetracarboxylic acid derivative and a structural unit derived from a diamine, and an imidized polymer that is an imidization 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): A compound (B) which is represented by formula (1). (The meaning of each symbol in formula (1Ta) and formula (1Da) is as defined in the description.) (The meaning of each symbol in formula (CL) is as defined in the description.)

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.

The invention discloses a metal organic framework LCU-138, a preparation method thereof and application of the metal organic framework LCU-138 in biomarker detection, the chemical formula of the metal organic framework LCU-138 is ({[Cd (L) 0.5 (bppa) 0.5. H2O]} n), the metal organic framework LCU-138 has a three-dimensional supramolecular structure, L represents anions after deprotonation of a ligand 2 ', 5'-difluoro-[1, 1 ': 4', 1 '-triphenyl]-2, 2' ', 4, 4'-tetracarboxylic acid, and bppa represents a ligand 1, 2-bis (4-pyridyl) ethane. The LCU-138 fluorescent material provided by the invention has good chemical stability, and the frame structure is not damaged after the LCU-138 fluorescent material is soaked in various solvents for 24 hours; biomarkers 2-aminoacetophenone and epinephrine can be efficiently detected, the fluorescence quenching constants (Ksv) of the biomarkers are 1.42 * 10 < 4 > M <-1 > and 5.84 * 10 < 3 > M <-1 > respectively, the detection limits of the biomarkers are 3.57 mu M and 10.32 mu M respectively, and the biomarkers have high sensitivity, high anti-interference performance and rapid detection capacity and can be recycled.

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.)

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. The polyimide P includes a structural unit A1 derived from a tetracarboxylic dianhydride having a six-membered acid anhydride structure and a structural unit B1 represented by the following formula (B1) derived from a diamine. In formula (B1), R1b-R8b are each independently a hydrogen atom or an optional substituent (excluding cases where all of R1b-R8b are hydrogen atoms and where R2b, R3b, R6b, and R7b are methyl groups and R1b, R4b, R5b, and R8b are hydrogen atoms), Ar1 and Ar2 are each independently an aromatic ring, and X1 is a single bond or an optional linking group.SELECTED DRAWING: None

The present invention provides a liquid crystal display element which is excellent in terms of reliability without being decreased in the voltage holding ratio even if irradiated with heat or ultraviolet rays, and which has a small accumulated charge, thereby being excellent in terms of afterimage phenomenon.　Provided is a liquid crystal aligning agent which contains the following component (A) and component (B). Component (A): A silane compound which has a blocked isocyanate skeleton. Component (B): At least one polymer that is selected from among polyimide precursors and polyimides, which are obtained by reacting a tetracarboxylic acid component with a diamine component that includes a diamine represented by formula [1a]. (In the formula, the definition of each symbol is as defined in the description.)

To provide polyimides which improve their optical transparency and reduce the amber color and birefringence that leads to optical retardation.SOLUTION: There is provided a polyimide film prepared from a liquid composition comprising a liquid composition comprising (a) a polyamic acid having a repeat unit structure of Formula I wherein Ra is the same or different at each occurrence and represents one or more tetracarboxylic acid component residues and Rb is the same or different at each occurrence and represents one or more diamine component residues, (b) one or more phosphorous-containing additives and (c) a high-boiling aprotic solvent. There are also disclosed processes for making the film and uses of the film in electronic devices.SELECTED DRAWING: None

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 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 acid dianhydride residues comprise a 3, 3 ', 4, 4'-biphenyl tetracarboxylic acid dianhydride residue and a spiro [11H-difuran [3, 4-b: 3 ', 4'-i] xanthene-11, 9 '-[9H] fluorene]-1, 3, 7, 9-tetraketone residue. The diamine residue contains a p-phenylenediamine residue. At least one of the tetracarboxylic dianhydride residue and the diamine residue further includes a residue having an ester bond. The tetracarboxylic dianhydride residue and / or the diamine residue further contains a residue having a diphenyl ether structure.

The present application provides a kind of polyimide laminated body and its preparation method.The polyimide laminated body, characterized in that, including: support substrate;And polyimide layer, laminated on support substrate, and made by polyamide acid solution, wherein, the mole mass of four carboxylic acid, four carboxylic acid dianhydride, diamine in polyamide acid solution The relationship as shown in formula (1), (2) and formula (3) is as follows: the mole mass of four carboxylic acid dianhydride / the mole mass of diamine=0.900~1.100…(1) the mole mass of four carboxylic acid / the mole mass of diamine=0.001~0.500…(2) [the mole mass of four carboxylic acid dianhydride+the mole mass of four carboxylic acid] / the mole mass of diamine=0.900~1.100…(3).