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AssigneeDow Toray Co., Ltd.
InventorsSon Thanh PHAN, Seiki TAMURA, Hiroyuki INAGAKI
Estimating the term…
Provided is a method to reduce allyl group-containing impurities in an oxypropylene group-containing glycol ether using a relatively easy and simple industrial facility and reaction process, to enable the hydrosilylation reaction products and oxypropylene group-containing glycol ether to be easily separated by distillation, or the like, to prevent the oxypropylene group-containing glycol ether from adversely affecting the polymerization reaction when used as a reaction solvent or diluent for polyether-polysiloxane block copolymers, and to easily produce the oxypropylene group-containing glycol ether at low cost. A method for producing oxypropylene group-containing glycol ethers, comprises a step of inducing a hydrosilylation reaction of an allyl group-containing impurity included in an oxypropylene group-containing glycol ether and a silicon atom-bonded hydrogen atom (Si—H)-containing compound. Optionally, an additional purification step is utilized for separating the oxypropylene group-containing glycol ether by distillation or the like.
A method for producing an oxypropylene group-containing glycol ether where a hydrogen is substituted with a hydrocarbon group having 1 to 8 carbon atoms at one end and that has an alcoholic hydroxyl group at another end and where the number of repeating units of oxyalkylene with 2 to 4 carbon atoms is in a range of 1 to 3, the method comprising:
One or more oxypropylene group-containing glycol ether or mixture thereof, wherein the molar ratio of residual C═C groups to oxypropylene groups is 1/2500 (0.04 mol %) or less, allyl group-containing impurities are not included, optionally including 1 ppm to 1% of an antioxidant, and a purity of 95 mass % or more, the oxypropylene group-containing glycol ethers selected from propylene glycol monobutyl ethers, dipropylene glycol monobutyl ethers, tripropylene glycol monobutyl ethers, propylene glycol monomethyl ethers, dipropylene glycol monomethyl ethers, tripropylene glycol monomethyl ethers, propylene glycol monopropyl ethers, dipropylene glycol monopropyl ethers, tripropylene glycol monopropyl ethers, propylene glycol monoethyl ethers, dipropylene glycol monoethyl ethers, and tripropylene glycol monoethyl ethers.
Dependencies are inferred from the claim text.