197 results about "Acetal" patented technology

The present invention relates to oriented, multilayer polyethylene films. In one aspect, a biaxially oriented, multilayer polyethylene film comprises: at least one inner layer comprising: (1) a polyethylene-based composition that comprises: (a) at least 97% by weight, based on the total weight of the polyethylene-based composition, of one or more polyethylenes having a density between 0.926 g / cm3 to 0.970 g / cm3 and a melt index (I2) between 0.1 to 10 g / 10 min; (b) 20 to 5000 ppm, based on the total weight of the polyethylene-based composition of a sorbitol acetal derivative comprising the structure of formula (I): wherein R1-R5 comprise the same or different moieties chosen from hydrogen and a C1-C3 alkyl.

This invention relates to the field of polymer material synthesis technology, specifically to a modified PVB resin and its preparation method. The invention introduces a fluorinated acetal monoaldehyde derivative containing fluorine into the PVB resin. This derivative is mixed with n-butyraldehyde and glyoxal, thereby undergoing an acetalization reaction with the 1,3-o-diol structure of the PVB molecular chain, incorporating the fluorinated side link into the PVB molecular chain. Utilizing the high electronegativity and high C-F bond energy of fluorine atoms, it shields against the intrusion of external corrosive media, inhibits oxidative yellowing, and improves weather resistance. Furthermore, the invention introduces glyoxal as a crosslinking agent, containing dialdehyde groups, which can react between adjacent polyvinyl alcohol segments, causing slight crosslinking between the originally linear PVB resin segments, improving the resin's shielding performance, further reducing the intrusion of external corrosive media, and enhancing the stability of the PVB resin.

The invention is directed to a process for the preparation of an aromatic acid or a phenolic compound, said process comprising reacting a dienophile and a furanic compound comprising an acetal moiety in a Diels-Alders reaction to obtain an aromatic compound comprising said acetal moiety, followed by hydrolysis and oxidation of said acetal moiety into a hydroxide or carboxylate moiety to form the aromatic acid or phenolic compound, wherein said dienophile is selected from the group consisting of alkylenes, acetylenes, acrylates, maleates, fumarates, maleimides, propiolates, acetylene dicarboxylates, and benzynes and wherein said acetal moiety is bound directly to the 2-position of the furanic compound.

The present application relates to the technical field of electrochromic, and more particularly to a high-hydroxyl polyvinyl acetal flame-retardant interlayer for electrochromic soundproof glass, and a preparation method thereof.The preparation process comprises the following steps: adding polyvinyl butyral with low acetalization degree into N,N-dimethylformamide, heating and stirring to dissolve, then adding plasticizer and electrolyte salt in sequence, heating and stirring to dissolve, pouring into a mold, vacuumizing to remove bubbles, and heating to remove solvent, thereby obtaining the flame-retardant interlayer.The present application solves the problems of liquid leakage, easy volatilization and safety hazards of the existing liquid reversible metal electrodeposition electrochromic device.

This invention provides a polynuclear metal cluster based on salicylaldehyde acetal-2-thiophenol ligand, its preparation method, and its application. The chemical formula of the polynuclear metal cluster is Co4(C 13 H9NOS)6·2CH3CN·CH3OH, where C 13 H9NOS is salicylaldehyde acetal-2-thiophenol, with Co forming a six-coordinate octahedral configuration with N, O, and S. The salicylaldehyde acetal-2-thiophenol ligand in the polynuclear metal cluster of this invention can effectively stabilize the active center of metallic cobalt, resulting in a polynuclear metal cluster with significant OER activity and broad prospects for practical applications.

This invention discloses a quantitative method for phospholipids, comprising: a sample preparation step, wherein a sample containing protein and phospholipids is mixed with Schiff reagent to obtain a sample for testing; a control sample preparation step, wherein the sample is mixed with a solvent of Schiff reagent to obtain a control sample; a measurement step, wherein the degree of a first optical property of the sample for testing and the degree of an optical property of the control sample are measured after the reaction of the aldehyde formed by the vinyl ether bond of phospholipids with Schiff reagent; and a determination step, wherein a correction degree obtained by correcting the degree of the first optical property using the degree of the optical property of the control sample is compared with the degree of a second optical property of the standard sample to determine the concentration of phospholipids in the sample, wherein the standard sample contains Schiff reagent and phospholipids of known concentration, and the degree of the second optical property is the degree of reaction of the Schiff reagent with the aldehyde formed by the vinyl ether bond of phospholipids.

The invention provides a non-contact temperature measurement system and temperature measurement method based on an organic phosphorescent material, and aims to solve the technical problem that the environment temperature cannot be monitored based on phosphorescent emission wavelength displacement due to performance limitation of the existing organic phosphorescent material. According to the non-contact temperature measurement system based on the organic phosphorescent material provided by the invention, the organic phosphorescent temperature-sensitive film is innovatively adopted to carry out temperature sensing on an object to be measured, and the organic phosphorescent temperature-sensitive film is obtained by mixing phosphorescent guest molecules, etherified cellulose and water according to a certain proportion, heating and melting the mixture, coating the mixture on a substrate and drying the substrate. Reversible aldehyde acetal can occur between phosphorescent guest molecules and the etherified cellulose, so that the phosphorescent emission wavelength of the formed organic phosphorescent temperature-sensitive film is subjected to red shift along with temperature rise, and the phosphorescent emission wavelength of the organic phosphorescent temperature-sensitive film can be analyzed; and the visual two-dimensional distribution monitoring of the continuous temperature within the temperature range of 77K-150K can be quickly and accurately realized.

The invention discloses a biodegradable polyester composition with controllable degradation time and a preparation method of the biodegradable polyester composition, and relates to the technical field of biodegradable materials. 20-40 parts by weight of carboxyl-terminated polylactic acid; 0.5 to 3.0 parts by weight of a bifunctional chain extender containing an acetal bond; 5 to 15 parts by weight of a polyethylene glycol-b-polycaprolactone block copolymer; 1-5 parts by weight of modified cellulose nanocrystals; and 0.1-0.5 part by weight of metal organic framework loaded lipase. By reasonably matching the components and optimizing the preparation process, the degradation time of the biodegradable polyester composition can be accurately controlled, and the degradation induction period and the complete degradation time can be adjusted as required. The compatibility of the components is good, the mechanical property and the processing stability of the material can be effectively improved, and the problem of inactivation or uneven dispersion of the components in the processing process is avoided.

The present invention relates to a nucleoside or nucleotide comprising a nucleobase attached to a detectable label via a cleavable linker, wherein the nucleoside or nucleotide comprises a ribose or 2' deoxyribose moiety and a 3'-OH blocking group, and the cleavable linker comprises a moiety of the structure: [Formula 1] TIFF2023531009000088.tif21128In formula, Each of X and Y is independently O or S; R 1a , R 2b , R 2 , R 3a and R 3b is independently H, halogen, unsubstituted or substituted C1-C6 alkyl, or C1-C6 haloalkyl. Also provided herein are methods for preparing such nucleotide and nucleoside molecules, and the use of fully functionalized nucleotides containing a 3' acetal blocking group for sequencing applications.

The application relates to a preparation method of 4-chloropyrrolopyrimidine, in particular to a four-step high-yield synthesis of 4-chloropyrrolopyrimidine by taking diethyl malonate and bromoacetaldehyde diethyl acetal as raw materials, through substitution reaction, then ring closure reaction with formamidine acetate, ring closure reaction under acidic conditions, and then chlorination reaction with phosphorus oxychloride; the preparation method of 4-chloropyrrolopyrimidine provided by the synthesis route is a preparation method with high yield, low cost, easy operation and suitability for industrialization.

The invention discloses a synthesis method of 2 '-O-methyladenosine, and belongs to the technical field of nucleoside synthesis and medicinal chemistry. According to the method, xylose which is rich in source is taken as an initial raw material, eight-step reaction including acetalation protection, acetylation, glycosylation, deacetylation, methylation, deacetalation protection, Mitsunobu reaction and secondary deacetylation is performed, reaction conditions of each step are accurately controlled, and finally, a target product is synthesized. The method has the advantages of high methylation reaction regioselectivity, mild reaction conditions, cheap and easily available raw materials and controllable cost, and overcomes the problems of poor methylation reaction regioselectivity, harsh reaction conditions and high cost in the existing synthesis method. The obtained product has important application value in the fields of research and development of antiviral drugs, design of nucleic acid probes and the like.

The invention aims to establish a synergistic catalytic system in which catalysts cannot coexist. The amide chiral catalyst is prepared through a series of synthesis. The hollow mesoporous COF-carboxylic acid / chiral amide multi-catalyst is prepared by a hydrothermal method. The morphology and the structure of the material are characterized by using a scanning electron microscope, a transmission electron microscope, an X-ray diffractometer, a specific surface instrument, an infrared spectrometer and the like, an asymmetric tandem-addition reaction is catalyzed to construct a chiral acetal compound, high performance liquid chromatography analysis is combined, and multiple catalysts are continuously recycled. Results show that the hollow mesoporous COF-carboxylic acid / chiral amide multi-catalyst not only has good morphology, excellent specific surface area and high porosity, but also enables contradictory catalysts to coexist for synergistic catalysis. The catalyst can be used for rapidly catalyzing an asymmetric tandem-addition reaction, high selectivity of ee = 99% and high yield of 98% are achieved, and the catalyst can be repeatedly used for 10 times. The method is green, environment-friendly, low in cost and suitable for concerted catalysis of catalysts which cannot coexist.

To provide an injection chemical composition that can achieve both curability in water and foaming and curability in non-water environments, even after being exposed to high temperature and high humidity environments. [Solution] An injection solution composition comprising a first agent (A) and a second agent (B), wherein the first agent (A) comprises an aqueous solution of sodium silicate (A-1), an organic polyol (A-2), and a tertiary amine catalyst (A-3), and the second agent (B) comprises an organic polyisocyanate containing a mixture of diphenylmethane diisocyanate and polymethylene polyphenyl polyisocyanate having 3 or more isocyanate functional groups (B-1), or a reaction product (B-1') of an active hydrogen group-containing compound and a mixture (B-1), at least one acid component (B-2) selected from the group consisting of phosphate monoesters and phosphate diesters, and at least one hydrolyzable component (B-3) selected from the group consisting of orthoester compounds and acetal compounds.

This invention discloses a method for preparing a key intermediate of iodopyridine, using dimethyl malonate as a raw material, and sequentially undergoing dihydroxylation S1 → acetalization S2 → hydrolysis and acidification S3 → decarboxylation S4 to obtain iodopyridine. The raw materials of this invention are inexpensive and readily available in the market, and the reaction efficiency is high, improving the purity and yield of the product. Intermediates 1 and 2 obtained from the process do not require separation and purification operations and can be directly used in the next step of the reaction. The purification effect is significant, yielding intermediate products with a purity ≥99%, and the total yield of the five steps is as high as 65-70%, which is beneficial for large-scale production.

This invention belongs to the field of organic chemical synthesis, specifically relating to a 3-amino-2-indolone compound containing a thioacetal skeleton, its synthesis method, and its applications. The synthesis method involves adding aryl-substituted dithioacetal and 1-substituted-3-imino-2-indolone as reactants to an organic solvent. The reaction is carried out under the synergistic catalysis of naphthol phosphate and a Cu metal catalyst at 2-5°C with stirring. The reaction is monitored by TLC until complete, followed by filtration, concentration, and purification to obtain the final product. The 3-amino-2-indolone compound synthesized in this invention possesses potential pharmaceutical activity due to its thioacetal skeleton. The reaction conditions of this invention are relatively conventional, the reaction process is mild, simple, and low-cost, suitable for large-scale industrial production, thus broadening the applicability of this method. A wide variety of substrates are used as reactants, resulting in structurally diverse products with high yields.

A mixture of methylene diphenylamine isomers and polymethylene polyaniline is prepared with a controllable ratio of methylene diphenylamine isomers. Aniline and formaldehyde are reacted to produce N,N'-diphenylmethylenediamine (acetalamine), which is then partially rearranged in the presence of a heterogeneous catalyst to a mixture of aminobenzylaniline and methylene diphenylamine isomers. Further rearrangement is performed in the presence of a homogeneous catalyst to convert the remaining aminobenzylaniline isomers to methylene diphenylamine and polymethylene polyaniline.

The invention discloses a high-impact polypropylene composite material for an energy storage electrode frame. The high-impact polypropylene composite material is prepared from the following components in parts by weight: 78-83 parts of co-polypropylene, 10-20 parts of a toughening agent, 0.2-1 part of nucleating master batch, 0.1-0.5 part of an antioxidant and 0.1-0.5 part of a lubricant, wherein the nucleating master batch comprises a carboxylate compound and a sorbitol acetal compound in a mass ratio of 1: (1-4). The method can be applied to industrial batch production of the composite material for the energy storage electrode frame with low density and low shrinkage.

The invention belongs to the field of medicine synthesis, and particularly relates to a preparation method of 3-hydroxy-4-fluorobenzoate. According to the preparation method disclosed by the invention, 3-bromo-4-fluorobenzaldehyde is taken as an initial raw material, and the compound 3-hydroxy-4-fluorobenzoate is prepared through four steps of reactions including aldolization, boronation, oxidation and esterification. The 3-hydroxy-4-fluorobenzoate can be used for preparing the acomidid or an intermediate 3-(3-(3, 5-dimethyl-1H-pyrazol-4-yl) propoxy)-4-fluorobenzoate of the acomidid, and the 3-(3, 5-dimethyl-1H-pyrazol-4-yl) propoxy)-4-fluorobenzoate can be used for preparing the acomidid. The preparation method has the advantages of easily available raw materials, mild reaction conditions, simple operation, high yield and purity, and suitableness for industrial production.

A cleaning agent composition and a method for removing thermoplastic polymers using the cleaning agent composition are disclosed. The cleaning agent composition comprises at least 10 to 90 wt% of a cyclic acetal compound and 10 to 90 wt% of an aprotic solvent, wherein the aprotic solvent comprises an aromatic ether compound and / or an lactone compound. This cleaning agent composition can not only clean residual materials on wafers but also clean coating equipment and pipelines.

The application discloses green cross-linked polyvinyl acetal porous powder and a preparation method and application thereof, and relates to the technical field of polymer materials. The green cross-linked polyvinyl acetal porous powder is prepared by heterogeneous cross-linking reaction of polyvinyl acetal porous powder and a bio-based cross-linking agent in a green solvent, wherein the polyvinyl acetal porous powder is prepared by acetal reaction of polyvinyl alcohol and an aldehyde compound under the action of an acid catalyst. The bio-based cross-linking agent derived from natural oil or sugar is used to replace the traditional chemical synthetic cross-linking agent, and the green solvent system of gamma-valerolactone / ethanol is used to replace the traditional volatile organic solvent, so that VOC emission and the use of toxic substances are avoided from the source, the VOC content is only 12-15 g / L, the green cross-linked polyvinyl acetal porous powder has good environmental friendliness, and meanwhile, has excellent solvent resistance and low-temperature flexibility, and can be widely applied in the fields of flexible electronic packaging materials, green powder coatings, environment-friendly adhesives and the like.

To provide a composition that forms a protective film with excellent resistance against a semiconductor wet etching solution during the lithographic process when producing semiconductors; a method for producing a substrate with a resist pattern, to which the protective film is applied; and a method for producing semiconductor devices.SOLUTION: A composition for forming a protective film against a semiconductor wet etching solution is provided, which contains: a compound containing at least one acetal structure in its molecule, or a polymer thereof; and a solvent.SELECTED DRAWING: None

This invention discloses a polyvinyl alcohol acetal resin, its preparation method, its application, and a film containing the polyvinyl alcohol acetal resin. The absolute value of the difference between the chloride ion content and the acid value in the resin is ≤0.02. A 0.76 mm thick film made from this resin exhibits transmittance of not less than 85%, 88%, and 90% at wavelengths of 440 nm, 540 nm, and 640 nm, respectively, and an average transmittance of not less than 89.5% across the entire wavelength band under a D65 light source. The preparation method includes: dissolving polyvinyl alcohol and cooling it; adding an acid catalyst and n-butyraldehyde; carrying out an acetalization reaction using staged gradient stirring; neutralizing; and then performing multi-stage washing, dehydration, purification, and drying to obtain the resin. By monitoring the conductivity of the washing water online to ≤40 μS / cm, precise control of ionic impurities is achieved, thereby solving the color difference problem caused by the uneven transmittance of PVB resin at different wavelengths. This method is suitable for applications such as high-transparency laminated glass.

A method includes forming a composite material, the method comprising reacting: an isocyanate component; an isocyanate-reactive component comprising at least one Lewis acid catalyzed polyether polyol, based on the weight of the isocyanate-reactive component, the weight of the at least one Lewis acid catalyzed polyether polyol being less than the weight of the at least one Lewis acid catalyzed polyether polyol; the polyether polyol having 90 weight percent (wt.%) or more of polypropylene oxide, a primary hydroxyl group concentration of at least 30 wt.%, a functionality of at least 2, an OH number in the range of 100 mg KOH / g to 800 mg KOH / g, an average acetal content of at least 0.05 wt.%, and a water content in the range of 0.1 wt.% to 2 wt.%; and wherein a reinforcing material is present in at least one of the isocyanate component, the isocyanate reactive component, or the third component.

The application discloses a kind of weather-resistant PVB resin and its preparation method and application.A kind of preparation method of weather-resistant PVB resin includes the following steps: polyvinyl alcohol aqueous solution is cooled to 4-12 ℃, then emulsifier, acid catalyst is added, stirring, aldehyde is added to perform acetalization reaction, after heat preservation 0.5-1.5 h, temperature is raised to 60-75 ℃, then boric acid salt is added, and it is maintained at 60-75 ℃ for 1-2 h;Add base to perform acid-base neutralization reaction, wash with water after acid-base neutralization reaction, then adjust pH value to 11-12 by adding base again, wash with water again, centrifugal to obtain final product.The PVB resin preparation method of the application, by adding boric acid salt additive, improves the oxidation corrosion resistance and heat resistance of the resin, thereby further improving weather resistance.

The present invention relates to a compound of formula (I), a delivery system based on a photosensitive cyclic acetal or ketal compound capable of releasing an active volatile carbonyl compound into the ambient environment in a controlled manner upon exposure to light. Furthermore, the invention relates to the use of said compounds in the perfumery, as well as to perfuming compositions or perfumed consumer products comprising the compounds of the invention.

This invention relates to the field of biomaterial synthesis technology, specifically disclosing a method for preparing a class of catechol derivatives and their applications, administration, and preparation apparatus. The methods include: preparing dopa or carbidopa derivatives using a sodium sulfite-boric acid-argon protective system in an organic-aqueous mixture; or using dopa as a raw material, performing a methyl esterification reaction with SOCl2 and anhydrous methanol, followed by an exchange reaction with methyl trifluoroacetate to achieve a one-pot synthesis of Tfa-DOPA-OMe; or preparing acetal-protected tanshinone derivatives based on dopa derivatives or tanshinone and its derivatives; or using acetal-protected tanshinone and its esters to prepare natural catechol compounds such as Shimobashiric acid C, and preparing non-natural catechol compounds through coupling reactions with organic acids, amino acids and their derivatives, oligopeptides and polypeptides, alcohols, or sugars. Highly selective deprotection conditions achieve the goal of completely and thoroughly removing the acetal protection of catechols without destroying the ester bonds within the molecular structure.

The application discloses a synthesis method of polyvinyl butyral resin and belongs to the technical field of synthetic resin of high polymer materials. In view of the problems of difficulty in controlling the reaction process, easy degradation of polyvinyl main chain and insufficient product performance stability in the preparation of polyvinyl butyral by using single inorganic strong acid or single organic acid catalysis in the prior art, the application introduces an organic acid and inorganic acid synergistic catalytic system in the acetal reaction process, so that the two types of acids jointly play a catalytic role in the reaction system to synergistically control the acetal reaction process. By the technical scheme, the controllability of the reaction process is improved while the acetal reaction efficiency is ensured, which is conducive to inhibiting the acid degradation of the polyvinyl main chain and improving the structural uniformity and performance stability of the obtained polyvinyl butyral. The method of the application is suitable for industrial preparation of polyvinyl butyral, and the obtained product can be applied to the fields of laminated safety glass, functional glass, photovoltaic components and paint and the like.

The invention provides a polyvinyl acetal adhesive and a preparation method and application thereof, and belongs to the technical field of high polymer materials, the polyvinyl acetal adhesive is prepared from an aldehyde compound and a polyvinyl alcohol aqueous solution through an aldolization reaction, and the aldehyde compound comprises dialdehyde cellulose and optionally further comprises formaldehyde. According to the invention, dialdehyde cellulose derived from natural cellulose is used as a green cross-linking agent, an environment-friendly adhesive system based on biomass is established, and formaldehyde harm is reduced or even eliminated. Performance test results show that the comprehensive performance of the adhesive is greatly improved while the purpose of removing formaldehyde is achieved.

This invention discloses a rare-earth element-containing cationic catalyst, its preparation method, and its application, belonging to the field of catalyst technology. Using 732 polystyrene sulfonic acid resin as a support, the target catalyst is prepared in four steps: pretreatment, zirconium coordination modification, aminobisphosphonic acid ligand grafting, and rare-earth ion chelation loading. This invention constructs a Brønsted-Lewis dual-acid synergistic catalytic system through directional structural design, achieving both ultra-stable rare-earth loading and retention of strong acidic sites, significantly improving the catalyst's water resistance, catalytic activity, and cycle stability. This catalyst can efficiently catalyze the synthesis of polyoxymethylene dimethyl ether from industrial formaldehyde aqueous solution and methyl acetal, exhibiting excellent formaldehyde conversion and target product selectivity. It is suitable for both batch and continuous production processes and has good prospects for industrial application.