ethylene oxide polymerization

The reactor is heated to 100° C. and 15 ml of propylene oxide is fed in. Role of the surface hydroxyl groups of modified titanium oxide in catalytic ethylene oxide hydration. Initiator compounds of this type include, for example, allyl alcohol, 3-butene-1-ol, cyclohex-2-ene-1-ol and the like. After the completion of the addition of the predetermined amount of ethylene oxide, the system was stirred for about two hours to yield a slurry containing a polyethylene oxide powder in n-hexane. Specific examples include, but are not limited to, lithium hydroxide, sodium hydroxide, potassium hydroxide, cesium hydroxide and rubidium hydroxide. Zns[Co(CN)6]o[Fe(CN)5NO]p.zL.nZnCl2 (o, p, q=positive numbers, s=1.5o+p); Zns[Co(CN)6]o[Co(NO2)6]p[Fe(CN)5 NO]q.zL.nZnCl2 (o, p, q=positive numbers, s=1.5(o+p)+q); Zn[Co(CN)6]o[Fe(CN)5NO]p .zL.nLaCl3 (o, p=positive numbers, s=1.5o+p); Zns[Co(CN)6]o[Co(NO2)6]p[Fe(CN)5NO]q .zL.nLaCl3 (o, p, q=positive numbers, s=1.5(o+p)+q); Zns[Co(CN)6]o[Fe(CN)5NO]p.zL.nCrCl3 (o, p=positive numbers, s=1.5o+p); Zns[Co(CN)6]o[Co(NO2)6]p[Fe(CN)5NO]q .zL.nCrCl3 (o, p, q=positive numbers, s=1.5(o+p)+q); Mgs[Co(CN)6]o[Fe(CN)5NO]p.zL.nZnCl2 (o, p=positive numbers,s=1.5o+p); Mgs[Co(CN)6]o[Co(NO2)6]p[Fe(CN)5 NO]q.zL.nZnCl2 (o, p, q=positive numbers, s=1.5(o+p)+q); Mgs[Co(CN)6]o[Fe(CN)5NO]p.zL.nLaCl3 (o, p=positive numbers, s=1.5o+p); Mgs[Co(CN)6]o[Co(NO2)6]p[Fe(CN)5NO]q .zL.nLaCl3 (o, p, q=positive numbers, s=1.5(o+p)+q); Mgs[Co(CN)6]o[Fe(CN)5NO]p.zL.nCrCl3 (o, p=positive numbers, s=1.5o+p); Mgs[Co(CN)6]o[Co(NO2)6]p[Fe(CN)5NO]q .zL.nCrCl3 (o, p, q=positive numbers, s=1.5(o+p)+q); as well as the various complexes such as are described at column 3 of U.S. Pat. As shown in Examples 1 to 3, when the amount of the ethylene oxide to be used was twice or three times (on the basis of the concentration of the catalyst system used), the molecular weight of a resulting polyethylene oxide correspondingly doubled or tripled. Attempts have been made to produce these using DMC catalysts, and in particular to form the poly(oxyethylene) blocks through a DMC-catalyzed polymerization of ethylene oxide. Regarding the catalyst system, the concentration of potassium t-butoxide was reduced from 1.0 mmol to 0.6 mmol and the amount of the 1.0 M triisobutylaluminium (Al(i-Bu)3) solution in n-hexane was changed from 10 ml to 6 ml. The yield is 1260 g of a very light colored liquid which became opaque (white) upon standing overnight but remained fluid. A solution of 10.5 g of a 1000 molecular weight poly(propylene oxide) diol, 2.7 g of t-butanol and 42 g distilled water is added to the slurry and mixed in. Privacy Policy Anionic polymerization initiated by cyclodextrins suffers from a poor solubility of those derivatives in standard polymerization solvents. Examples of the most preferable aliphatic solvents include n-butane, isobutane, n-pentane, cyclopentane, industrial hexane, n-hexane, isohexane, cyclohexane, n-heptane and n-octane. Because ethylene oxide is potentially explosive, an atmosphere of an inert gas such as nitrogen or argon can be charged to the reactor in order to dilute the concentration of ethylene oxide in the vapor space to a level outside the explosive limit. Thus, suitable heteroatom-containing groups include hydroxyl, carboxylic acid and thiol groups. zinc chloride in 50 mL water is added to the bead mixture over about 1 minute. The Mn of the primary product is 380. Suitable ketones include acetone, methyl ethyl ketone, 3-pentanone, 2-hexanone and the like. A white filtrate is obtained, which is dried overnight in a vacuum oven (30 mm Hg, 50° C.). Ethylene oxide is pumped in until the pressure is doubled. Herzberger, J., Niederer, K., Pohlit, H., Seiwert, J., Worm, M. Herzberger, Jana ; Niederer, Kerstin ; Pohlit, Hannah ; Seiwert, Jan ; Worm, Matthias. Thus, for applications where a liquid polyether is desired, a poly(ethylene oxide) homopolymer made in accordance with this invention desirably has a molecular weight of less than about 700. Overall polydispersity is 1.37. Thus, it is of particular interest to add enough ethylene oxide to form a liquid product, and especially to make a product of about 700 weight average molecular weight or below. More preferred catalyst complex levels are from about 10, especially from about 25, to about 5000, more preferably about 3000 ppm, on the same basis. Lower equivalent weight poly(propylene oxide) polymers can be made using strongly basic catalysts, but contain significant quantities of monofunctional impurities. L represents an organic complexing agent; M3xAy represents a water-soluble salt of metal ion M3 and anion A, wherein M3 is the same as or different than M; b and c are positive numbers that, together with d, reflect an electrostatically neutral complex; x and y are numbers that reflect an electrostatically neutral salt; z is zero or a positive number and n is a positive number indicating the relative quantities of the complexing agent and MxAy, respectively. % metal cyanide catalyst (as Zn3[Co(CN)6]2.nZnCl2, ignoring any associated water and complexing agent). NMR analysis shows that the ethylene oxide has added onto the initiator. Polymers of ethylene oxide have heretofore been produced in two molecular weight ranges. S53-27319. The induction period follows, as indicated by a nearly constant or slowly decreasing pressure in the reactor. A method similar to that described in Example 1 was used. That is to say, the catalyst composition for the production of a poly(ethylene oxide) polymer of the present invention is a catalyst composition capable of producing a poly(ethylene oxide) polymer having a molecular weight range from about 20,000 to 200,000 by direct polymerization economically in a high yield, wherein the catalyst composition comprises component A: an organoaluminum compound and component B: at least one kind of an alkali metal alkoxide compound or an alkali metal hydroxide compound. ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:IZUMI, HIDEKI;REEL/FRAME:017106/0061, Free format text: S62-232433. 89.65 g of a 3.66 wt % solution of H3Co(CN)6 in methanol (15.05 mmol H3Co(CN)6) is added over 15 minutes to a stirred mixture of ZnCl2 (6.15 g, 45.2 mmol), 25.0 g of an 8000 molecular weight bis(dimethoxymethylsilyl)-terminated poly(propylene oxide) (Aldrich catalog #45,041-3) and 15 g tetraethyl orthosilicate (15.0 g) in 150 mL methanol. 274. Besides the synthetic progress, new types of multifunctional linear PEG (mf-PEG) and PPO structures accessible by copolymerization of EO or PO with functional epoxide comonomers are presented as well as complex branched, hyperbranched, and dendrimer like polyethers. The mixture is heated at 100° C. for a period after the pressure drops to a constant value in order to complete the reaction of the propylene oxide. S45-7751 and JP-B No. The most preferred compound in the suitable organoaluminum compounds is triisobutylaluminium. With the ever growing toolbox for epoxide polymerization, a {"}polyether universe{"} may be envisaged that in its structural diversity parallels the immense variety of structural options available for polymers based on vinyl monomers with a purely carbon-based backbone.". 3,278,457, 3,278,458, 3,278,459, 3,404,109, 3,427,256, 3,427,334, 3,427,335, 5,470,813, 5,482,908, 5,536,883, 5,589,431, 5,627,120, 5,627,122, 5,639,705, 5,714,428, 5,731,407, 5,780,584, 5,783,513, all incorporated herein by reference. Another object of the present invention is to disclose a novel catalyst composition composed of two components, component A and component B. 3,278,457 and 3,404,109 and anhydrides as described in U.S. Pat. About two hours after that, an ethylene oxide feed to the reactor is begun, starting at 1 g/min and gradually increasing to 4 g/min and then decreasing to 3.5 g/min, until a total of 1105 g ethylene oxide has been added. Ethoxylations of various initiator compounds are performed in the presence of metal cyanide catalysts. Yet other initiators of particular interest are saturated compounds that contain a base-sensitive group, such as a halogen, cyano group, ketone, nitro group, ester group and the like. Polymerization is catalyzed by a number of materials, such as acids, alkalis, some carbonates, oxides of iron and aluminum, and chlorides of iron, tin, aluminum, and boron. No. The product is estimated to contain 7.7 wt. The concentration of the catalyst is selected to polymerize the ethylene oxide at a desired rate or within a desired period of time. Such comonomers include oxetanes as described in U.S. Pat. The metal-containing cyanide catalyst can be represented by the general formula: M1 and M2 are transition metal ions that may be the same or different; each X independently represents a group other than cyanide that coordinates with an. and you may need to create a new Wiley Online Library account. The mass of the dried catalyst complex is 8.85 g. 2-methyl-3-butyn-2-ol (259.24 g) is ethoxylated with 1050 g ethylene oxide according the general method described in Example 8, using 16.55 g of the supported catalyst from part A The product has a polydispersity of 1.66 and an Mn of 380. Suitable monoalcohols also include halogenated alcohols such as 2-chloroethanol, 2-bromoethanol, 2-chloro-1-propanol, 3-chloro-1-propanol, 3-bromo-1-propanol, 1,3-dichloro-2-propanol, 1-chloro-2-methyl-2-propanol as well as nitroalcohols, keto-alcohols, ester-alcohols, cyanoalcohols, and other inertly substituted alcohols.

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