153 results about "Trioxane" patented technology

A polyacetal resin composition comprises a polyacetal resin having a trioxane content of not more than 100 ppm (preferably not more than 50 ppm, and more preferably not more than 10 ppm) and at least one stabilizer selected from the group consisting of an antioxidant, a formaldehyde emission inhibitor, a processing stabilizer and a heat stabilizer. The polyacetal resin may be a polyacetal resin (particularly a polyacetal copolymer) in which the trioxane amount is reduced by a solvent treatment and/or a heat treatment. Moreover, the polyacetal resin composition may further contain at least one additive selected from the group consisting of a weather (light)-resistant stabilizer, an impact resistance improver, a gloss control agent, a sliding improver, a coloring agent, and a filler. Such a polyacetal resin composition can reduce the amount of trioxane elution and/or the amount of a volatile organic compound from a molded product thereof.

A liquid organic, fuel cell is provided which employs a solid electrolyte membrane. An organic fuel, such as a methanol/water mixture, is circulated past an anode of a cell while oxygen or air is circulated past a cathode of the cell. The cell solid electrolyte membrane is preferably fabricated from Nafion™. Additionally, a method for improving the performance of carbon electrode structures for use in organic fuel cells is provided wherein a high surface-area carbon particle/Teflon™-binder structure is immersed within a Nafion™/methanol bath to impregnate the electrode with Nafion™. A method for fabricating an anode for use in a organic fuel cell is described wherein metal alloys are deposited onto the electrode in an electro-deposition solution containing perfluorooctanesulfonic acid. A fuel additive containing perfluorooctanesulfonic acid for use with fuel cells employing a sulfuric acid electrolyte is also disclosed. New organic fuels, namely, trimethoxymethane, dimethoxymethane, and trioxane are also described for use with either conventional or improved fuel cells.

The invention relates to a synthesis method of methyl-alpha-fluoroacrylate and analogues thereof. The method comprises the following steps: step 1, based on methyl fluoroacrylate and dimethyl oxalate serving as raw materials, dissolving the raw materials in a solvent, and adding base for carrying out condensation reaction so as to generate sodium enolate or potassium enolate intermediate; and step 2, reacting sodium enolate or potassium enolate intermediate with paraformaldehyde or trioxane in the solvent so as to generate methyl-alpha-fluoroacrylate. According to the invention, cheap methyl fluoroacrylate and dimethyl oxalate are used as the raw materials, and the low-cost solvent and other reactants are selected, thus the method has the advantages of low preparation cost and high yield and can be suitable for large-scale industrial production.

In only two steps and in 65% overall yield, natural trioxane artemisinin (I) was converted on gram scale into C-10-carba trioxane dimer (3). This new, very stable dimer was then transformed easily in one additional step into four different dimers (4-7). Alcohol and diol dimers (4 and 5) and ketone dimer (7) are 10 times more antimalarially potent in vitro than artemisinin (1), and alcohol and diol dimers (4 and 5) are strongly inhibitory but not cytotoxic toward several human cancer cell lines. Water-soluble carboxylic acid derivatives (8a-10c and 12) were easily prepared from dimers (4-6); they are thermally stable even at 60° C. for 24 hours, are more orally efficacious as antimalarials than either artelinic acid or sodium artesunate, and have potent and selective anticancer activities. Further derivitization of the alcohol dimers (4 and 17), diol dimer (5) and ketone (7) has produced a number of analogs also antimalarially active in vitro at sub-nanomolar concentrations (most notably: pyridine N-oxides (13, 15, 18, 23, 24 and 25), phosphoric acid triesters (26 and 27), sulfonamide (40) and cyclic carbonate (41)). In addition, dimers (13 and 19) are more efficacious (when administered both orally and i.v.) and less toxic (when administered intraperitoneally to mice as a single dose) than clinically-used sodium artesunate, thereby giving them a better antimalarial therapeutic index than sodium artesunate.

To provide a process for stable and continuous production of a polyacetal resin, mainly comprising a copolymer of 1,3-dioxolane and trioxane under the presence of a catalyst, in a high yield on an industrial scale for a long period of time. In the continuous production of a polyacetal resin by mixing 1,3-dioxolane with boron trifluoride and/or a coordination compound of boron trifluoride and then, mixing the obtained mixture with trioxane to conduct bulk polymerization in a polymerization machine, 1,3-dioxolane is brought into contact with boron trifluoride and/or a coordination compound of boron trifluoride while feeding both at the same direction and they are mixed together for 0.1 to 30 seconds under the condition of at least 0.1 m/sec of the linear velocity of the mixture and subsequently mixed with trioxane.

A polyacetal resin composition having high rigidity and also excellent in dimensional stability and creep characteristics is provided. A polyacetal resin composition prepared by blending (A) 99.9 to 90 parts by weight of a linear polyacetal resin having a melt index of 1 to 50 g/min obtained by copolymerizing (a) 99.5 to 97.5% by weight of trioxane and (b) 0.5 to 2.5% by weight of a compound selected from a mono-functional cyclic ether compound and a mono-functional cyclic formal compound, with (B) from 0.1 to 10 parts by weight of a branched or crosslinked polyacetal resin having a melt index of 0.1 to 10 g/min obtained by copolymerizing (a) 99.49 to 95.0% by weight of trioxane, (b) 0.5 to 4.0% by weight of a compound selected from a mono-functional cyclic ether compound and mono-functional cyclic formal compound and (c) 0.01 to 1.0% by weight of a poly-functional glycidyl ether compound with the number of functional groups of 3 to 4, in which (A) and (B) are selected so that the ratio between the melt index of (A) and the melt index of (B) can satisfy the relation of the following formula:

0.02≦MI_B/MI_A≦1.5   (1)

(where MI_A is a melt index of (A) and MI_B is a melt index of (B))

The invention provides a preparation method of X-ray and gamma-ray shielding composite fiber. The preparation method includes the steps of S1, preparation of functional powder particles for surface active inorganic ray shielding; S2, blending granulation; S3, preparation of primary fiber. Polypropylene and polyethylene terephthalate are respectively adopted as the matrix of the composite fiber, tungsten powder and bismuth powder are taken as shielding agents for X-ray and gamma-ray, silane coupling agent VIII (aminophenyl trioxane) is taken as intermediates for surface modification of inorganic functional powder fillers in order to increase interfacial bonding between inorganic powder and organic matter, the lead-free composite protective fiber with high X-ray shielding agent content, gooddurability, excellent physical and mechanical properties and textile processing properties and good wearability is prepared, and broad application prospect is achieved.

The process serves for the preparation of trioxane from formaldehyde in the gas phase in the presence of a tungstomolybdophosphoric acid of the composition H3PWnMomO40xxH2O (n=4-8, m=12-n; x=0-32) as catalyst.

Biologically-active, water soluble, 3-substituted trioxanes of the formula wherein R represents a COOH- substituted aryl group, a substituted or unsubstituted heteroaryl group or an alkyl group, and C12-(p-carboxy)benzyloxy trioxanes of formula wherein R represents a substituted or unsubstituted alkyl, alkenyl, aryl or heteroaryl group and methods for their use as antiparasitic agents, particularly for the treatment of malaria.

Process for the separation of an aqueous mixture of trioxane and formaldehyde and corresponding applications. The aqueous trioxane and formaldehyde mixture has first trioxane:formaldehyde ratio. The process includes the steps of reacting the aqueous mixture of trioxane and formaldehyde with urea, and separation an exiting vapor phase having a second trioxane:formaldehyde ratio that it higher than the first trioxane:formaldehyde ratio. An aqueous mixture of trioxane and formaldehyde coming from a reactor in which trioxane is being synthesized or from a distillation column in which a prior aqueous mixture of trioxane and formaldehyde can be separated from the excess formaldehyde. Raw material for the production of urea-formaldehyde glues or resins can be formed.

The invention discloses a production process for s-trioxane and an extraction reaction tower. Specifically, the extraction reaction tower includes an extraction agent inlet disposed at the bottom, a reactant recovery port arranged at the top, and multiple stages of extraction reaction units arranged sequentially from the bottom up. Adjacent extraction reaction units are separated by perforated tower plates, also downcomers are disposed between adjacent extraction reaction units, and the extraction reaction units are internally provided with a solid acid catalyst. The production process for s-trioxane and the extraction reaction tower provided by the invention can reach a formaldehyde conversion rate of more than 45%, and also have the characteristics of small steam consumption in the reaction process, and low equipment investment and the like.

To provide a resin material in which various properties of a polyacetal resin such as excellent appearance, slidability and thermal stability are maintained and a rigidity is improved as well. That is, a polyacetal copolymer which is prepared by a copolymerization of 100 parts by weight of trioxane (A), 0.0005 to 2 parts by weight of the component (B), which is a compound (B-1) having at least three glycidyl groups in the molecule or a compound (B-2) having at least two epoxy groups in the molecule, and 0 to 20 parts by weight of a cyclic ether compound (C) copolymerizable with trioxane, and which has a total terminal group amount of 15 to 150 mmol/kg, when (B) is (B-2).

The present invention relates to novel substituted 1,2,4-trioxanes that are useful as anti-malarial agents, and have a general formula 1,wherein R1 and R2 are selected from the group consisting of a hydrogen, a C1-11 alkyl group; R3 and R4 are selected from the group consisting of a hydrogen, a C1-11 alkyl group, a C3-10 aryl group, a C1-2CO2H carboxyalkyl group; and X represents hydrogen or a lower alkoxy group having 1 to 6 carbons.

A production method for a polyacetal copolymer that makes deactivation of a catalyst simple and efficient and that achieves a high polymerization yield and high quality using equipment that does not require a cleaning step and a process that involves a simple operation technique. The production method for a polyacetal copolymer uses trioxane as a main monomer and a cyclic ether and/or a cyclic formal having at least one carbon-carbon bond as a comonomer. In the production method, a predetermined heteropoly acid is used as a polymerization catalyst to perform copolymerization, a predetermined salt is added to the reaction product, melt kneading processing is performed, and the polymerization catalyst is deactivated.

An initiator for cationic polymerization comprises a salt of a protic acid as well as a protic acid. The molar ratio of protic acid to salt is in the range from 1:0.01 to 1:2000. The initiator is used for example for cationic homo- or copolymerization of trioxane, and permits stable and flexible operation of the polymerization.

The invention relates to a manufacturing method of polyacetal copolymer. The manufacturing method is capable of reducing scales, and can stably and continuously produce high quality polyacetal copolymer in a long term in a high yield. The manufacturing method comprises the following steps: mixing cyclic ether and/or cyclic condensed formaldehyde, a polymerization catalyst, acetal, which is represented by the formula (1), with a low molecular weight, an organic solvent, and an antioxidant to obtain a pre-mixed solution; and then feeding the pre-mixed solution and trioxane into a polymerization machine to carry out polymerization. Formula (1): R-(CH2-O)n-R.... in the formula (1), the R represents a free hydrogen atom, a straight chain alkyl group or a branched alkyl group, a straight chain alkoxyl group or a branched alkoxyl group, or a hydroxyl group, and n represents an integer in a range of 1 to 20.

Novel substituted 1,2,4-trioxanes and 1,2,4-trioxepanes useful as anti-malarial and/or anticancer agents, and an improved method for their preparation, preferably involving a thiol-olefin co-oxygenation (TOCO) reaction between an allylic alcohol and a ketone.