- Synthesis and characterization of semifluorinated polymers via group transfer polymerization
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Group transfer polymerization (GTP) was used to prepare semifluorinated polymers based on acrylic and methacrylic monomers. In the first case, electrophilic catalyzed GTP was applied with 1-methoxy-2-methyl-1-trimethylsilyloxy-1-propene (MMTP) as initiator, zinc iodide as catalyst and 1H,1H,2H,2H-perfluorooctyl acrylate as monomer. In this way it has been possible to obtain oligomers. Higher molecular weight polymers were prepared by means of the nucleophilic tetrabutylammonium benzoate as catalyst. With MMTP as initiator, 1H,1H,2H,2H-perfluoroalkyl methacrylates, F(CF2)m(CH2)2OCOC(CH3)=CH2, were polymerized to molecular weights > 4.5 kg mol-1. The polydispersity was found to depend strongly on the length of the perfuoroalkyl side chain, i.e. Mw/Mn decreases with increasing m.
- Krupers, Maarten J.,Moeller, Martin
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- Cross-polarization for a fluoropolymer involving multiple spin baths of abundant nuclei
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The thermodynamic theory of cross-polarization (CP) between one abundant and one rare spin is well understood and widely applied. CP dynamics between several abundant spin baths has some inherent complications that lead to misinterpretation of the CP rates and relaxation parameters if not properly accounted for. A general thermodynamic description of CP dynamics involving up to six spin baths is developed and implemented with MATLAB. The CP dynamics for a fluorinated polymer, (2-perfluorohexylethyl acrylate)-styrene co-polymer, was analysed as a system with five spin baths-four 19F and one 1H. The CP behaviour was successfully simulated above the glass-transition temperature. The CP rates and T1ρ's are discussed in terms of the structure and dynamic behaviour of the polymer.
- Hazendonk, Paul,Harris, Robin K.,Galli, Giancarlo,Pizzanelli, Silvia
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Several fluorinated and chlorofluorinated acrylates and methacrylates were synthesized from the alcohols RFCH2OH with RF=CCl3, CHClCH2CCl3, (CF2CFCl)nCl, (C2F4)nH, CF3, C7F15 and C6F13CH2. The corresponding polymers were also studied for their application as transparent polymeric materials. For this purpose the refractive indices n20D of the monomers and the polymers were measured as were the Tg values of the polymers. A study of their infrared spectra shows to what extent these products could be utilized taking into consideration their absorption in the long wavelength range between 0.85 and 1.50 m. The refractive indices of these polymers, which are reduced when increasing the number of fluorine atoms in the molecule, and that of the Tg measured between 50 and 70° C for the fluorinated methacrylates, indicate a potential use of these polymers as sheathing materials for optical fibres.
- Boutevin,Rigal,Rousseau,Bosc
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- METHOD FOR PRODUCING FLUORINE-CONTAINING (METH) ACRYLATE
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To provide a method for producing fluorine-containing (meth) acrylate that allows a reaction to proceed under a mild condition and can be conducted conveniently and industrially.SOLUTION: A method for producing a fluorine-containing (meth) acrylate includes a process in which: a fluorine-containing alkyl iodide represented by general formula (1) and a (meth) acrylic acid metal salt are reacted with each other in a mixed solvent of organic solvent and water in the presence of a phase transfer catalyst. Rf-(CH2)n-I (1) (where, Rf is a C1-16 fluorinated aliphatic hydrocarbon group, n is an integer of 1-4).SELECTED DRAWING: None
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Paragraph 0053-0056; 0059
(2021/03/13)
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- Method for preparing fluorinated acrylate from fluorinated alcohol (by machine translation)
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Under the presence of a self-made fluorine-containing catalyst, a solvent and an auxiliary agent, the fluorinated alcohol reacts with the acrylate, the generated methanol is gradually rectified and removed in the reaction process, and the excess acrylic ester, the solvent and the solvent are rectified to obtain a high-purity target product. The method uses a self-made fluorine-containing catalyst, and is good in compatibility with a reaction system, low in reaction temperature, high in reaction speed, less in impurity generation, simpler in product manufacturing mode and convenient for industrial production. (by machine translation)
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Paragraph 0035-0038; 0042-0044; 0054-0056
(2020/07/21)
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- Environmentally friendly preparation method of fluorine-containing acrylate
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The invention relates to the technical field of preparation of new fluorine-containing materials, particularly to an environmentally friendly preparation method of fluorine-containing acrylate. The environmentally friendly preparation method comprises: carrying out a reaction on short-chain perfluoroiodoalkane and ethylene, separating, and purifying to obtain perfluoroalkylethyl iodide; carrying out hydrolysis on the perfluoroalkylethyl iodide, separating, and purifying to obtain perfluoroalkylethanol; and carrying out a reaction on the perfluoroalkylethanol and acrylic acid, separating, and purifying to obtain the product. According to the present invention, the perfluorooctyl-free product is synthesized, the potential risk of PFOA production cannot exist, and the obtained product is theenvironmentally friendly product, and meets the national industrial policy; the preparation method is simple, and is suitable for industrial production; and the reaction conversion rate is high, and the purity of the intermediate product is high, such that the subsequent reaction is easily performed, the yield is easily increased, and the cost is reduced.
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Paragraph 0025
(2019/01/06)
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- PRODUCTION METHOD OF FLUORINE-CONTAINING (METH)ACRYLIC ACID ESTER
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PROBLEM TO BE SOLVED: To provide a method for producing (meth)acrylic acid ester at high reaction selectivity by using a transesterification catalyst having low toxicity and high water proofness, and comparatively-easily separable and recoverable after reaction. SOLUTION: In a production method of (meth)acrylic acid ester, (meth)acrylic acid alkyl ester and fluorine-containing alcohol are subjected to a transesterification reaction by using titanium sulfate or iron sulfate as a catalyst. Preferably, an alkyl group in the (meth)acrylic acid alkyl ester has a number of carbon atoms of 4 or smaller. SELECTED DRAWING: None COPYRIGHT: (C)2016,JPOandINPIT
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Paragraph 0039
(2016/10/07)
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- Method for Producing Fluorine-Containing Alkyl (Meth)Acrylate
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The present invention discloses a method for producing a fluorine-containing alkyl (meth)acrylate represented by the following general formula (2): [in-line-formulae]Rf—(CH2)k-[-A-(CH2)l—]m—OCOCR═CH2??(2)[/in-line-formulae] (wherein R is a hydrogen atom or a methyl group), characterized by reacting a fluorine-containing alcohol represented by the following general formula (1): [in-line-formulae]Rf—(CH2)k-[-A-(CH2)l—]m—OH??(1)[/in-line-formulae] (wherein Rf is a perfluoroalkyl group having 1 to 21 carbon atoms; A is S, SO or SO2; k is 0, 1 or 2; 1 is k, 2 or 3; m is 0 or 1; however, a case of k=0 and m=0 is excluded), (meth)acrylic acid, anda sulfonic acid halide in the presence of a base containing at least one kind of tertiary amine.
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Page/Page column 5
(2009/02/11)
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- Fluoroalkyl surfactants
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Surfactants of formula (I) wherein each R is independently hydrogen or a C1 to C4 alkyl group;A is independently hydrogen or —C(O)—O—B;Ro is a linear, branched or cyclic aliphatic group, or combination thereof, having from about 2 to about 100 carbon atoms, interrupted or substituted by 1 to about 50 hydrophilic groups, said hydrophilic groups selected from the group consisting of hydroxyl, amino, ether and mixtures thereof; wherein specific ratios of and bonding of hydrophilic groups to carbon atoms is required;each B is independently of specific formulae containing perfluoroalkyl and —S(CH2)t—, and m, d, n, and t are 0 or integers with specific limitations.
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Page/Page column 15
(2008/12/05)
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- PROCESS FOR PRODUCING FLUORINATED (METH)ACRYLIC ESTER
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A mixture of fluoroalkyl iodides of the formula C2F5(CF2CF2)nI ( n is an integer of ≥0) wherein the sum of such fluoroalkyl iodides of n=3 and n=4 contained is ≥85 mol% is provided. This mixture is subjected to an ethylene addition step and an esterification step, and C2F5(CF2CF2)nCH=CH2 and C2F5(CF2CF2)nCH2CH2OH are removed. Thus, there can be obtained a mixture of fluorine-containing (meth)acrylic esters of the formula C2F5(CF2CF2)nCH2CH2OCOCR1=CH2 (wherein R1 represents a hydrogen atom or a methyl group, and n is an integer of ≥0) wherein the content of impurities (namely, olefins of the formula C2F5(CF2CF2)nCH=CH2 and alcohols of the formula C2F5(CF2CF2)nCH2CH2OH) is low.
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Page/Page column 9-10
(2010/11/25)
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- PROCESS FOR PRODUCING FLUORINATED ACRYLIC ESTER
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A mixture of fluorine-containing acrylic esters represented by CF3(CF2)nCH2CH2OCOCR1=CH2 wherein R1 is a hydrogen atom, a methyl group or a halogen atom and "n" is an integer of at least zero is subjected to distillation under such conditions that the esters are not polymerized, so as to give a mixture of the esters with a less content of impurities (that is, olefins represented by CF3(CF2)nCH=CH2 and alcohols represented by CF3(CF2)nCH2CH2OH) at a high yield.
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Page/Page column 6-7; 8-9
(2008/06/13)
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