摘要:
Formulations formed by aqueous dispersions of cationic ionomer fluorinated polyurethanes based on (per)fluoropolyethers, having end groups constituted by nullNCO groups reacted with hydrogenactive compounds to give covalent bonds stable to water but thermolabile, usable for the surface hydro- and oil-repellent treatment of textiles.
摘要:
Thermoprocessable copolymers of TFE essentially formed by the following monomers: FMVE; a perfluorodioxole of formula: 1 nullthe complement to 100% by weight in compositions A) and B) being TFE.
摘要:
Use as heat exchange or hydraulic liquids in circuits or equipments subjected to ionizing radiations and/or irradiation with neutrons, of fluorinated liquids selected from the group formed by: A) (per)fluoropolyethers, B) (per)fluorocarbons, C) hydrofluoroethers, appearing liquid under room conditions (25null C., 1 atm).
摘要:
Mixtures of fluoropolymer dispersion, wherein: a) a dispersion is formed by TFE (co)polymers with average particle sizes in the range 180-400 nm; b) another dispersion selected from: 1) (co)polymer dispersion of TFE; 2) thermoplastic copolymers of TFE; the average particle sizes of dispersion b) range from 20 to 60 nm; the ratio between the particle sizes of dispersion b) compared with those of dispersion a) is lower than 0.3.
摘要:
A process for obtaining non thermoprocessable fine powders of homopolymer or modified PTFE, comprising the following steps: A) obtaining of the polymer latex under the gel form; B) washing of the polymer gel with acid aqueous solutions or neutral aqueous solutions; C) granulation of the gel washed by mechanical stirring, at a specific power in the range 1.5-10 kW/m3, until flotation of the PTFE fine powder, and separation of the floated fine powder; D) drying in an aerated oven of the floated fine powder at a drying temperature in the range 90null C.-160null C.
摘要翻译:获得均聚物或改性PTFE的非热可加工细粉末的方法,包括以下步骤:A)以凝胶形式获得聚合物胶乳; B)用酸性水溶液或中性水溶液洗涤聚合物凝胶; C)通过机械搅拌,以1.5-10kW / m 3的比功率洗涤凝胶,直到PTFE细粉末浮选,并漂浮的细粉分离; D)在漂浮的细粉末的充气烘箱中在90℃-160℃的干燥温度下干燥。
摘要:
Fluoroelastomers, curable by peroxidic route, obtainable by polymerizing the following monomers: a) C2nullC8 hydrogenated fluoroolefins; b) fluorovinylethers of general formula: CFXnullCXOCF2OPnullnull(I) c) bis-olefins having general formula: RI1RI2CnullCRI3-Z-CRI4nullCRI5RI6nullnull(IA) and optionally: d) one or more fluorinated olefinic comonomers selected from perfluoroalkylvinylethers (PAVE) CF2nullCFOR2f, perfluorooxyalkylvinylethers CF2nullCFOXa, e) C2-C8 perfluorolefins; f) one or more C2-C8 non fluorinated olefinic comonomers said fluoroelastomers comprising iodine and/or bromine atoms in the chain and/or in end position.
摘要:
Metal substrates having a coating based on ethylene/chlorotrifluoroethylene (E/CTFE) having a TmII of 230null C.-264null C. and a MFI lower than 5 g/10null.
摘要:
Porous hydrophilic membranes comprising a porous inert support on which an ionomer is deposited, said membranes being characterized in that they have an ionic conductivity and a water permeability higher than 1 l/(h.m2.Atm).
摘要:
Method for removing water from surfaces of various materials, comprising the steps of covering said surface with a composition having specific weight higher than that of water and subsequently removing water from the composition by skimming, wherein a composition essentially consisting of the following components is used: a fluorinated non ionic additive component A) of formula: T-ORf(CFY)-L nullnull(I) a (per)fluoropolyether component B), wherein the ratio by weight (K) between the (per)fluorinated part and the hydrogenated L part of the additive is in the range 1.50-4.00 and the ratio KI between the number average molecular weight of the fluoropolyether part T-ORf- of the additive and the number average molecular weight of the component B) is higher than 1.60.
摘要:
A thermoprocessable copolymer of TFE essentially formed by: (a) from 4.5 to 8.5% by weight of perfluoromethylvinylether (PMVE); (b) from 0.3 to 1.6% by weight of a perfluorodioxole of formula: 1 nullwherein: YnullF, ORf, Rf wherein Rf is a perfluoroalkyl having from 1 to 5 carbon atoms; X1 and X2, equal to or diferent from each other, are nullF or nullCF3; (c) TFE, forming the remaining part to 100%.
摘要翻译:TFE的热可加工共聚物基本上由以下组成:(a)4.5至8.5重量%的全氟甲基乙烯基醚(PMVE); (b)0.3〜1.6重量%的全氟二恶烷,其中:Y = F,OR f,Rf其中Rf是具有1至5个碳原子的全氟烷基; X 1和X 2彼此相同或不同,为-F或-CF 3; (c)TFE,剩余部分形成100%。