摘要:
Perfluoroether acylperoxides having an average equivalent weight in the range 350-5000, and the following formulas:Y'-(CF 2 -CF(CF 3 )O) m -(CX'FO) n -CF 2 CO-O-O-CO-CF 2 -(OCX'F) n - (OCF(CF 3 )-CF2) m -Y' wherein Y' = Cl, ORf wherein Rf is a C1-C3 perfluoroalkyl; m, n are integers such that (I) gives the mentioned EW, m/n ≥ 40; X' = F, CF3; T-CF 2 -O-[(CF 2 CF 2 O) p -(CF 2 O) q -CF 2 -CO-O-O-CO-CF 2 (OCF 2 ) q - -(OCF 2 CF 2 ) p ] y -OCF 2 -COOH wherein y is an integer comprised between 1 and 5; p and q are integers such as to give the above mentioned EW, p/q = 0.5 - 2.0; T = COOH, F with the proviso that if T = COOH y = 1-5, if T = F then y = 1; and process for obtaining them.
摘要:
A gaseous process for reducing the amount of chloropentafluoroethane (CFC 115) impurity present in pentafluoroethane (HFC 125) characterized in that pentafluroethane is allowed to flow on a catalyst formed by a trivalent chromium salt, optionally supported, at temperatures in the range 200°C-400°C, obtaining the reaction of chloropentafluoroethane with pentafluoroethane with formation of hexafluoroethane (FC 116) and tetrafluorochloroethane (HCFC 124).
摘要:
A gaseous process for eliminating chlorine atoms from a chlorofluorocarbon (CFC) of formula C n F x Cl y , wherein n is an integer from 1 to 3 and x + y = 2n + 2 , wherein said compound is reacted with an hydrofluorocarbon of formula C n' F x' H y' wherein n', x', y' are as above defined, in the presence of a fluorination catalyst in solid phase at temperatures in the range 200°C-400°C.
摘要翻译:用于从式CnFxCly的氯氟烃(CFC)中除去氯原子的气体方法,其中n是1至3的整数并且x + y = 2n + 2,其中所述化合物与式Cn'Fx'Hy的氢氟烃 其中n',x',y'如上所定义,在固相氟化催化剂存在下在200-400℃范围内的温度下进行。
摘要:
A gaseous process for obtaining pentafluoroethane by dismutation of chlorotetrafluoroethane in the presence of a supported catalyst, said catalyst being formed of a mixture of trivalent chromium oxide with at least an alkaline-earth metal oxide selected from Mg, Ca, Sr and Ba.
摘要:
A process for preparing a solution and/or dispersion containing sulphonic (per)fluorinated ionomers having -SO 3 M functional groups, wherein M is selected from H, Li, Na, K, NR 4 (R equal to or different from each other are selected from H, CH 3 ,C 2 H 5 ), characterized in that it dissolves the above defined ionomers at a temperature comprised between the room temperature and about 150°C, in a monophasic ternary mixture essentially constituted by water, by a C 1 -C 4 alcohol and by a fluoro(poly)oxyalkylene having one hydrogen atom in at least a fluorinated end group; the dispersed polymer particle sizes are in the range 30-100 nm.
摘要:
Fluoropolymer aqueous dispersions comprising an hydrogenated nonionic surfactant and a fluorinated nonionic surfactant selected from the following classes:R f -L-(OCH(R 1 )-CH (R 2 )) n -O-A wherein: n is an integer comprised between 4 and 60; L is selected from: -(CF(Y)-CO-O)pR'- ; -(CF(Y)-CO-NH)pR'-; -(CF(Y)-SO2-NH)pR'-;wherein: p is 0 or 1; Y can be F or CF3; R' is an alkylic radical C1-C5;R1, R2 can preferably be both H or the former H and the latter CH3,Rf can be a radical of (per)fluoroalkane type from 4 to 20 C atoms or of (per)fluoropolyether type;A is selected from the following ones: -H; -CH3 -CH2OH; -CH2OCH2CH2OH; -CH2 (OCH2CH2)n'''OR' wherein n''' is an integer between 2 and 15 and R' is H, CH3, COCH3; -CONHCH2CH2OH
摘要:
Azeotropic or near azeotropic compositions based on difluoromethoxy-bis (difluoromethyl ether) and/or 1-difluoromethoxy-1,1,2,2-tetrafluoroethyl difluoromethyl ether.
摘要:
Use as foaming agents having a low environmental impact of azeotropic or near azeotropic compositions using difluoromethoxy-bis(difluoromethyl ether) and/or 1-difluroromethoxy-1,1,2,2-tetrafluoroethyl difluoromethyl ether.
摘要:
Curable fluoroelastomers comprising in the chain monomeric units formed by a triazine iodinated derivative having general formula: wherein Y' is independently H, Cl, F, CH 3 , CF 3 ; m' and t' are integers selected between 0 and 1, and m' + t' = 0 or 1 , preferably m' + t' = 0 ; p' is an integer and it is equal to 1 when t' = 1, or p' = 0; X' is independently H, Cl, F, alkyl or perfluoroalkyl C 1 -C 3 , preferably F; n' is an integer comprised between 2 and 20, preferably between 4 and 12, more preferably between 4 and 8.