55 results about "1,5-Pentanediol" patented technology

An ink for ink jet recording and an ink jet recording method which realize an image quality of laser printer on a plain paper in a one-pass printing mode under conditions of a volume of an ink droplet ejected being 5 to 43 Pico liter, a velocity of an ink droplet being 6 to 20 m/sec, frequency of 1 kHz and resolution of 300 dpi or more. The ink for ink jet recording is a penetrating type ink which comprises (1) at least one humectant selected from glycerin, 1,3-butandiol, triethyleneglycol, 1,6-hexanediol, propyleneglycol, 1,5-pentanediol, diethyleneglycol, dipropyleneglycol, trimethylolpropane and trimethylolethane, (2) colorant contained in the amount of 6 % by weight or more, (3) a polyol having 8 to 11 carbon atoms and glycolether, and an anionic surfactants or non-ionic surfactants, the ink has viscosity of 5 mPa.s or more at 25° C. and a surface tension of 40 mN/m or less.

Recombinant hosts for producing polyhydroxyalkanoates and methods of producing polyhydroxyalkanoates from renewable carbon substrates are provided. Certain recombinant hosts that produce 5 carbon chemicals such as 5-aminopentanoate (5AP), 5-hydroxyvalerate (5HV), glutarate, and 1,5 pentanediol (PDO) are also provided. One embodiment provides a recombinant host expressing a gene encoding a heterologous enzyme selected from the group consisting of a polyhydroxyalkanoate synthase and a 5-hydroxyvalerate-CoA (5HV-CoA) transferase, wherein the host produces a polymer containing 5-hydroxyvalerate. Preferably, the host expresses both a polyhydroxyalkanoate synthase and a 5HV-CoA transferase. The host can be prokaryotic or eukaryotic. A preferred prokaryotic host is E. coli. The polymers produced by the recombinant hosts can be homopolymers or copolymers of 5-hydroxyvalerate. A preferred copolymer is poly(3-hydroxybutyrate-co-5-hydroxyvalerate).

The invention relates to a method for preparing a novel A-B/X or A/X carried catalyst of 1,5-pentanediol by performing a selective hydrogenolysis reaction on tetrahydrofurfuryl alcohol obtained from forestry and agricultural residues taken as raw materials. According to the novel A-B/X or A/X carried catalyst, wherein the component A is any one or more than one of Rh, Ir, Pt, Pd and Ru; the assistant B is any one or more than one of V, Nb and Ta; the carrier X is any one of SiO2, activated carbon, SiO2-Al2O3, titanium oxide and zirconium oxide; the carrying quantity of a precious metal A in the catalyst is between 0.5% and 10%; the molar ratio of the assistant B to the precious metal A is 0.01-1.0; the reaction pressure is between 1MPa and 20MPa; and the reaction temperature is between 50 DEG C and 150 DEG C. The novel A-B/X or A/X carried catalyst has the characteristics of moderate reaction condition, high reaction activity and good selectivity, thereby providing a novel effective way for preparing the 1,5-pentanediol by utilizing biomasses of the forestry and agricultural residues.

The invention relates to a bi-component composite adhesive for a solar power back panel, and a preparation method thereof. The adhesive consists of a component A and a component B, wherein the component A mainly comprises dipropylene glycol, hydroxypivalyl hydroxypivalate, 2,4-diethyl-1,5-pentanediol, terephthalic acid, phthalic anhydride, 1,12-dodecanoic acid, a hydrolysis-resistant stabilizing agent, ethyl acetate and a small amount of organotin catalyst, and the component B is an aliphatic polyisocyanate curing agent; the weight ratio of the component A to the component B is (10-16): 1. According to the bi-component composite adhesive, through a simple esterification synthesis reaction, high-hydrophobicity dibasic alcohol and long-carbon-chain dibasic acid are introduced to prepare polyester polyol which is good in temperature resistance and hydrolysis resistance; through the addition of the catalyst and the hydrolysis-resistant stabilizing agent, the curing reaction speed of the adhesive is further accelerated, and the hydrolysis resistance of the cured adhesive is further improved. The composite adhesive prepared by the invention is applied to the solar power assembly back panel to endow the solar power assembly back panel with better UV resistance, hydrolysis resistance and aging resistance.

An ink for use in combination with an ink-jet printer comprises a mixture including a colorant, a liquid vehicle comprising 1,6-hexanediol and 1,5-pentanediol in a ratio in the range of 1:4 (wt/wt) to 4:1 (wt/wt), and/or an amount of imidazole in the range of 0.1 wt % to 6 wt %, and potentially provides at least one of the following enhancements to the ink improved print quality, increased decap time, pen reliability, environmental robustness of ink in pen, environmental robustness of printed ink on media, and aid in maintaining the pH of the ink in a desired range.

A thermoplastically processable polyurethane molding material which is composed of a blend of at least two thermoplastic polyurethane, with at least 5 percent by weight, as a component A, being composed of a thermoplastic polyurethane which is obtained by reacting one or a plurality of aliphatic polyols which have a molecular weight of 800 to 4000 g/mol and a hydroxyl number of 20 to 235 and which are selected from the group of polyadipates, polycaprolactones, polycarbonates, polytetrahydrofurans and corresponding copolymers or mixtures thereof with 1,6-hexamethylene diisocyanate and the chain-extending agent 1,6-hexanediol in an equivalent ratio of the 1,6-hexamethylene diisocyanate to the polyol of 1.5:1 to 14.0:1, the NCO index formed from the quotient, which is multiplied by 100, of the equivalent ratios of isocyanate groups to the sum of the hydroxyl groups of polyol and chain-extending agent lying within a range of 96 to 105, and 100 percent by weight of the rest, as a component B, being composed of one or a plurality of further thermoplastic polyurethane which is obtained by reacting one or a plurality of aliphatic polyols which have a molecular weight of 800 to 4000 g/mol and a hydroxyl number of 20 to 235 and which are selected from the group of polyadipates, polycaprolactones, polycarbonates, polytetrahydrofurans and corresponding copolymers or mixtures thereof with the diisocyanates: 1,6-hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, diphenylmethane diisocyanate and a chain-extending agent selected from the group of 1,4-butanediol, 1,5 pentanediol, 1,4-cyclohexanediol, bis(hydroxymethyl)cyclohexane, bis(hydroxyethyl)hydroquinone, polycaprolactone having a number average molecular weight of 350 to 600 g/mol and polytetrahydrofuran having a number average molecular weight of 200 to 600 g/mol in an equivalent ratio of the diisocyanate to the polyol of 1.5:1 to 14.0:1, the NCO index formed from the quotient, which is multiplied by 100, of the equivalent ratios of isocyanate groups to the sum of the hydroxyl groups of polyol and chain-extending agent lying within a range of 96 to 105.

The invention discloses a method for continuously preparing 1, 5-pentanediol from tetrahydrofurfuryl alcohol. According to the method, platinum loaded tungsten-zirconium composite oxide is taken as a catalyst, and a 10-90% solution tetrahydrofurfuryl alcohol aqueous 10-90% solution and hydrogen are simultaneously and continuously introduced into a fixed bed reactor for reaction so as to generate1, 5-pentanediol under the reaction conditions that the temperature is 100-150 DEG C, the pressure is 1-5 MPa, the mass flow rate of the tetrahydrofurfuryl alcohol is 0.05-1 A/H (A is the mass of the catalyst in the reactor), and the mol ratio of hydrogen to tetrahydrofurfuryl alcohol is 10-100. The mol ratio of various metal elements in the catalyst is Pt: W: Zr=(0.05-0.5): 1: (5-30). The method is moderate in reaction condition, high in catalytic activity, good in product selectivity, simple in process and continuous in production; and the raw materials are from biomass, thereby meeting the green chemical development direction.

The invention relates to a catalytic agent capable of utilizing furfuryl alcohol liquid-phase catalytic hydrogenation to prepare pentanediol, which is characterized in that an H-USY molecular sieve serves as a carrier, an isovolumetric impregnation method is adopted to introduce an active metal component, drying and roasting are carried out, and in-situ temperature-programmed reduction is carried out under a hydrogen atmosphere so as to prepare the catalytic agent. The catalytic agent has high-activity and selectivity for utilizing the furfuryl alcohol hydrogenation to prepare the pentanediol.

A method is provided for obtaining highly pure 1,6-hexanediol in which the contents of impurities such as 1,4-cyclohexanediol, 1,5-hexanediol, 1,2-cyclohexanediol, 1,7-pentanediol, 1,5-pentanediol and high boiling point components are significantly reduced.

This process for producing 1,6-hexanediol from cyclohexane comprises the steps of:

• • (1) treating an aqueous extraction concentrate of a reaction mixture obtained by oxidation of cyclohexane with a lower alcohol to esterify monocarboxylic acids and dicarboxylic acids contained in the extract, and simultaneously remove and separate by distillation water, excess lower alcohols and carboxylic acid esters; (2) converting oligomer esters contained in the bottom liquid to carboxylic acid esters by depolymerizing the oligomer esters at a high temperature and high pressure in the presence of a lower alcohol and a catalyst; and (3) hydrogenating the carboxylic acid esters distilled off in the step (1) and the carboxylic acid esters obtained in the step (2) either respectively or collectively to convert to 1,6-hexanediol.

To a copolyester reacted essentially by terephthalic acid components and ethylene glycol units, adding 1% to 15 weight % of specific diol unit selected from the group consisting of at least one of 2-butyl-2-ethyl-1,3-propanediol, 3-methyl-1,5-pentanediol, 2,4-diethyl-1,5-pentanediol and hydroxypivalyl hydroxypivalate; or adding 0 to 1.0 mole % of mulfunctional group components consisting of at least one or more of trimellitic acid, trimellitic anhydride and trimethylol propane; and adding 0.01 to 0.5 weight % of compound represented by the following formula: can improve the color hue of the copolyester, and increase the reaction rate of the copolyester subjecting to solid phase polymerization, therefore improve the color hue of the shaped articles produced therefrom; furthermore, reduce the decline degree of the intrinsic viscosity after melt processing.

The invention provides a tantalum-based catalyst and applications of the tantalum-based catalyst in a 1,5-pentanediol preparation reaction through catalytic conversion of tetrahydrofurfuryl alcohol. According to the catalyst, one or a plurality of a small amount of metals selected from platinum, palladium, iridium rhodium and the like are used as the active metal component and are supported on oneor a plurality of carriers selected from different forms of tantalum oxides, or two metals such as platinum and tantalum are supported on one or a plurality of carriers selected from SBA-15, MCM-41,silicon dioxide and active carbon; and the catalyst can achieve the catalytic conversion of tetrahydrofurfuryl alcohol at a temperature of 100-300 DEG C under a hydrothermal condition of the initial hydrogen pressure of 1-10 MPa. According to the present invention, the catalyst has characteristics of stable property, easy separation from the reaction system, convenient recovery and convenient regeneration, and can be conveniently used in industrial production application in the future.

The present invention provides a fluid bearing unit capable of achieving lower torque and lower current consumption in comparison with a conventional bearing unit, and a spindle motor using the same. The present invention employs an ester derived from 1,5-pentanediol having one alkyl side chain and saturated monovalent fatty acid having 5 to 8 carbon atoms as a base oil of a lubricant with which a gap between a shaft and a sleeve is filled.

It is provided a long life spindle motor that is excellent in startup characteristic in low-temperature environments such as 0° C., and that startup problems due to the evaporation or deterioration of lubricating oil can be avoided in high-temperature environments. The spindle motor includes a fluid dynamic bearing filled with a lubricating oil, containing a methyl pentanediol diester obtained by esterifying 3-methyl-1,5-pentanediol with n-decanoic acid and n-undecanoic acid at a molar ratio ranging from 90:10 to 20:80, and having a water content of not more than 1000 ppm.

An inkjet recording ink, including: a pigment; a water-soluble organic solvent; a surfactant; a polyether-modified silicone oil; a dispersing agent represented by the following General Formula (1) or (2); and water, wherein the water-soluble organic solvent contains: glycerin as a first water-soluble organic solvent; and a second water-soluble organic solvent, wherein the second water-soluble organic solvent is dipropylene glycol, 1,3-butanediol, 3-methyl-1,3-butanediol, 1,5-pentanediol, 1,6-hexanadiol, or any combination thereof, and wherein a mass ratio of the first water-soluble organic solvent:the second water-soluble organic solvent is 1:0.75 to 1:2.25,

An ink composition contains 3-methyl-1,5-pentanediol, di(ethylene glycol) 2-ethylhexyl ether, and water, and has a 1,2-hexanediol content of 0.5% by mass or less. In the ink composition, the mass ratio of 3-methyl-1,5-pentanediol to di(ethylene glycol) 2-ethylhexyl ether is in the range of 13/1 to 67/1.

The current invention provides methods for molecule purification by RP-LC and RP-HPLC that uses unbranched terminal alkyldiols as eluting solvents. In particular, the present invention purifies molecules, particularly proteins and peptides, on reverse phase liquid chromatography columns using a buffer containing either 1,5 pentanediol, 1,6 hexanediol or 1,7 heptanediol.

The invention belongs to the technical field of preparation of compounds, and discloses a method for preparing tetrahydropyrane by dehydrating and cyclizing 1,5-pentanediol. The method comprises the following steps: placing the 1,5-pentanediol in a reaction kettle filled with a loading-type heteropolyacid catalyst or loading-type heteropolyacid salt catalyst, performing dehydration and cyclizationreaction at normal pressure, collecting distillates with the distillation temperature less than or equal to 95 DEG C from the upper portion of the reaction kettle, and then rectifying the distillates, thus obtaining the product tetrahydropyrane. The preparation method disclosed by the invention adopts the loading-type heteropolyacid or salt thereof as the catalyst for the dehydration and cyclization reaction of the 1,5-pentanediol, and simple reaction procedures and mild reaction conditions are realized, so that the requirements on reaction equipment is reduced, the safety potential hazard ofthe production is reduced, and the industrialized popularization value is high.