% metal cyanide catalyst. Preferred complexing agents are t-butanol, 1-t-butoxy-2-propanol, polyether polyols having an equivalent weight of about 75-350 and dialkyl ethers of alkylene and polyalkylene glycols. 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. The method of producing polyethylene oxide as defined in, Polymerization catalyst composition for ethylene oxide and proces for the production of poly(ethylene oxide) with the same, Application filed by Meisei Chemical Works Ltd. Generally, a suitable amount of catalyst is from about 5 to about 10,000 parts by weight metal cyanide catalyst complex per million parts of the product. Thus, DMC catalysis has focussed on polymerizing propylene oxide. The ability of several catalysts to ethoxylate various initiator compounds is evaluated by placing a quantity of the initiator, a catalyst and ethylene oxide into a dried Wheaton vial fitted with a stir bar. H. A supported catalyst made as follows: 30.72 g of a H3Co(CN)6 solution (6.02 mmol H3Co(CN)6) is stirred into a mixture of zinc chloride (2.461 g, 18.1 mmol), 8 g of an 8000 molecular weight bis(dimethoxymethylsilyl)-terminated poly(propylene oxide) (Aldrich catalogue #45,041-3), tetraethyl orthosilicate (1.0 g, 4.8 mmol), and 30 mL of methanol. The initiator compound is a material having at least one oxyalkylatable group. The above-mentioned catalyst useful in the present invention is generally composed of two components. After the slurry is added the silica is further dried on the rotoevaporator at 70-75° C. bath temp and 25 inches Hg vacuum, then finally at 70-75° C. bath temp (>30 inches Hg vacuum) for approximately 10-15 min. The rearrangement reaction occurs at rates that approach or even exceed that of the desired propoxylation reaction. Measuring chain diffusion coefficients and activation energy during coalescence of fluorescence‐labeled hard latex particles, https://doi.org/10.1002/pi.1995.210360104. The product contains 23.6% primary hydroxyl groups, indicating that partial ethoxylation has occurred. Ethylene oxide is pumped in until the pressure is doubled. The mixture is maintained at 110° C. for ten hours, after which all of the ethylene oxide has polymerized. Dive into the research topics of 'Polymerization of ethylene oxide, propylene oxide, and other alkylene oxides: Synthesis, novel polymer architectures, and bioconjugation'. S62-232433. The X groups in any M2(X)6 do not have to be all the same. As little as one mole of ethylene oxide per equivalent of initiator compound can be added. When taking account of many applications of such polymers having medium molecular weights, there is a wide requirement for eliminating the existing molecular weight gap. The EO feeds out rapidly and is digested quickly. In Chemical Abstracts, there is, in fact, only one index number for polymers of ethylene oxide. Overall polydispersity is 1.37. For determining the amount of catalyst complex to use, the weight of the product is generally considered to equal the combined weight of ethylene oxide and initiator, plus any comonomers that may be used. Polymerization of ethylene oxide by the activated monomer mechanism 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.". ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:IZUMI, HIDEKI;REEL/FRAME:017106/0061, Free format text: In such continuous processes, the activated initiator/catalyst mixture is continuously fed into a continuous reactor such as a continuously stirred tank reactor (CSTR) or a tubular reactor. By GPC, the product has an Mn of 350, an Mw of 370 and a polydispersity of 1.06. A white flocculent forms as the zinc chloride solution is added. The catalyst is usually complexed with an organic complexing agent. Find more information on this substance at. So, end-capping with polyethylene oxide is usually performed using a basic catalyst such as potassium hydroxide, although in some instances the DMC catalyst may also be present. Learn about our remote access options, Institute of Polymers, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria, Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, 90‐363 Lodz, Sienkiewicza 112, Poland. Among alkali metal hydroxides, potassium hydroxide is the most preferable. 4th ed. After polymerization begins, ethylene oxide is fed at the rate of about 0.5 ml/min, until 30 ml ethylene oxide has been added. Specific examples of such applications include, but are not limited to, papermaking, fiber, paint, medical products, cosmetics, personal care products, toiletries, ceramics, chemical products, printing products, agriculture and forestry products, aquatic field, environmental field, construction building material products, electricity, instruments, machinery and metalworking. However, it is desirable that such a polymerization reaction be carried out within the range of 0 to 50° C. Such a range is the same as that used by a person skilled in the art. On the other hand, ethylene oxide polymers having a molecular weight of about several hundreds of thousands to about 8,000,000 are referred to as “poly (ethylene oxide).” Examples of patent documents in which such a technology is disclosed include U.S. Patent Specification No. 09/574,842, entitled Method for Preparing Metal Cyanide Catalysts Using Silane-Functional Ligands, filed May 19, 2000, may be used instead of or in addition to the aforementioned complexing agents. M1 and M2 are preferably Fe+3, Fe+2, Co+3, Co+2, Cr+2, Cr+3, Mn+2, Mn+3, Ir+3, Ni+2, Rh+3, Ru+2, V+4 and V+5. Ethylene oxide polymers having molecular weights within the range of several hundreds of thousands or more normally have a very wide molecular weight distribution and it is true that it is difficult to control their molecular weight during their production. GPC analysis shows the product to have a Mn of 380, with a main fraction at Mn 360 (polydispersity of 1.31) and a small fraction at Mn 1560 (polydispersity of 1.03). An autoclave is charged with 0.1328 parts of the catalyst complex from Example 2A and 32.8 grams of a 700 molecular weight poly(propylene oxide) triol (VORANOL® 2070, available from The Dow Chemical Company). A convenient way of adding the ethylene oxide is to pressurize the reactor with ethylene oxide and allow ethylene oxide to feed to the reactor on demand, maintaining a more or less constant pressure inside the reactor. author = "Jana Herzberger and Kerstin Niederer and Hannah Pohlit and Jan Seiwert and Matthias Worm and Wurm, {Frederik R.} and Holger Frey". Initiators of this type include hydroxyl-containing alkynes and cycloalkynes. % ethylene oxide and 6.2 wt.% residue from glycerine (from the triol initiator). The practical result of this is that it is very difficult to prepare poly(propylene oxide) polymers of above about 3000 equivalent weight in an anionic polymerization catalyzed with a strong base. If the catalyst concentration is less than about 0.4 mol %, the polymerization tends to become slow. The entire amount of ethylene oxide reacts within 10 hours. The mixture is cooled to 31° C., 155 g deionized water and 9.87 g potassium hexacyanocobaltate are added, and the mixture is stirred thoroughly. Polymers of ethylene oxide are well known and useful in a number of applications such as detergent and cleaner compositions, oil well drilling fluids, inks, metal working fluids, lubricants in paper coating compositions, ceramics manufacturing, chemical intermediates for organic nonionic surfactants which in turn are used in cosmetics, textiles and chemical processing, polyurethanes which are used as flexible foams and elastomers, chemical intermediates for esters which are used in textile spin finishes, manufacturing cosmetic agents, and foam control agents for a wide variety of processes. An additional 45 ml of ethylene oxide is added and the temperature raised to 120° C. This second portion of ethylene oxide polymerizes in about 160 minutes. B. Zinc hexacyanocobaltate complexed with glyme. Provided are a polymerization catalyst composition for ethylene oxide which can give polyethylene oxide having a molecular weight lower than that of the prior art and a relatively narrow molecular weight distribution, and a process for the production of polyethylene oxide by the use of the catalyst composition. Especially preferred complexing agents are t-butanol, 1-t-butoxy-2-propanol, polyether polyols having an equivalent weight of 125-250 and a dimethyl ether of mono-, di- or triethylene glycol. The yield of this reaction was 70%. Initiator compounds having secondary and/or tertiary hydroxyl groups are of particular interest. Under ethylene oxide polymerization conditions, this is manifested by a period during which reactor pressure remains constant or decreases only slowly.