摘要:
A flame-retardant composition includes a crystalline propylene homopolymer or copolymer, a copolymer of ethylene with at least one alpha-olefin having from 3 to 12 carbon atoms, and optionally with a diene, the copolymer of ethylene being characterized by a composition distribution index greater than 45%, the index being defined as a weight percentage of copolymer molecules having an alpha-olefin content within 50% of an average total molar content of alpha-olefin, and natural magnesium hydroxide in amounts such as to impart flame-retardant properties. A related cable with self-extinguishing properties includes a conductor and a flame-retardant coating. The flame-retardant coating includes the flame-retardant composition. A related method for manufacturing a cable having improved mechanical properties and enhanced fire resistance includes the steps of preparing a polymer mixture with flame-retardant properties and extruding the mixture on a conductor optionally pre-coated with an insulating layer, in order to obtain a flame-retardant coating.
摘要:
A cable, in particular for power transmission, for telecommunications or for data transmission, or also combined power/telecommunications cables, wherein at least one coating layer is comprised of a recyclable material which is halogen-free and has superior mechanical and electrical properties. This material comprises a polymer mixture of a crystalline propylene homopolymer or copolymer and an elastomeric copolymer of ethylene with at least one alpha-olefin having from 3 to 12 carbon atoms, and optionally containing a diene. The copolymer is characterized by a 200% tension set value of lower than 30% (measured at 20° C. for 1 minute according to ASTM standard D 412). The cable also includes a flame-retardant polymer composition.
摘要:
A cable, in particular for power transmission, for telecommunications or for data transmission, or also combined power/telecommunications cables, wherein at least one coating layer consists of a recyclable material which is halogen-free and has superior mechanical, electrical, and flame-retardant properties. This material consists of a polymer mixture comprising: (a) a crystalline propylene homopolymer or copolymer; and (b) a copolymer of ethylene with at least one alpha-olefin having from 4 to 12 carbon atoms, and optionally with a diene; the said copolymer (b) being characterized by a density of between 0.90 and 0.86 g/cm3 and by a Composition Distribution Index, defined as the weight percentage of copolymer molecules having an alpha-olefin content within 50% of the average total molar content of alpha-olefin, of greater than 45%. This material may also include a flame-retardant inorganic filler.
摘要翻译:一种电缆,特别是用于电力传输的电缆,用于电信或数据传输,或者还包括组合的电力/电信电缆,其中至少一个涂层由无卤素的可回收材料组成并且具有优异的机械,电和阻燃材料, 阻燃性能。 该材料由聚合物混合物组成,包括:(a)结晶丙烯均聚物或共聚物; 和(b)乙烯与至少一种具有4至12个碳原子的α-烯烃和任选与二烯的共聚物; 所述共聚物(b)的特征在于密度为0.90至0.86g / cm 3,并且通过组成分布指数,其定义为α-烯烃含量在平均总摩尔含量的50%以内的共聚物分子的重量百分比 α-烯烃,大于45%。 该材料还可以包括阻燃性无机填料。
摘要:
A flame-retardant polymer composition includes: (a) a crystalline propylene homopolymer or copolymer; (b) a copolymer of ethylene with at least one alpha-olefin having from 4 to 12 carbon atoms, and optionally with a diene; and (c) a flame-retardant inorganic filler. Copolymer (b) has a density of between 0.90 and 0.86 g/cm3 and a Composition Distribution Index, defined as the weight percentage of copolymer molecules having an alpha-olefin content within 50% of the average total molar content of alpha-olefin, of greater than 45%.
摘要翻译:阻燃聚合物组合物包括:(a)结晶丙烯均聚物或共聚物; (b)乙烯与至少一种具有4至12个碳原子的α-烯烃和任选与二烯的共聚物; 和(c)阻燃无机填料。 共聚物(b)的密度为0.90至0.86g / cm 3,组成分布指数定义为α-烯烃含量在α-烯烃含量的平均总摩尔含量的50%以内的共聚物分子的重量百分比, 烯烃,大于45%。
摘要:
A cable, in particular for power transmission, for telecommunications or for data transmission, or also combined power/telecommunications cables, wherein at least one coating layer consists of a recyclable material which is halogen-free and has superior mechanical and electrical properties. This material consists of a polymer mixture comprising: (a) a crystalline propylene homopolymer or copolymer; and (b) a copolymer of ethylene with at least one alpha-olefin having from 4 to 12 carbon atoms, and optionally with a diene; the said copolymer (b) being characterized by a density of between 0.90 and 0.86 g/cm3 and by a Composition Distribution Index, defined as the weight percentage of copolymer molecules having an alpha-olefin content within 50% of the average total molar content of alpha-olefin, of greater than 45%.
摘要翻译:电缆,特别是用于电力传输,用于电信或数据传输的电缆,或者还包括组合的电力/电信电缆,其中至少一个涂层由可再循环材料组成,其是无卤素且具有优异的机械和电气性能。 该材料由聚合物混合物组成,包括:(a)结晶丙烯均聚物或共聚物; 和(b)乙烯与至少一种具有4至12个碳原子的α-烯烃和任选与二烯的共聚物; 所述共聚物(b)的特征在于密度为0.90至0.86g / cm 3,并且通过组成分布指数,其定义为α-烯烃含量在平均总摩尔含量的50%以内的共聚物分子的重量百分比 α-烯烃,大于45%。
摘要:
A cable, in particular for power transmission, for telecommunications or for data transmission, or also combined power/telecommunications cables, wherein at least one coating layer consists of a recyclable material which is halogen-free and has superior mechanical and electrical properties. This material consists of a polymer mixture comprising: (a) a crystalline propylene homopolymer or copolymer; and (b) an elastomeric copolymer of ethylene with at least one alpha-olefin having from 3 to 12 carbon atoms, and optionally with a diene; the said copolymer (b) being characterized by a 200% tension set value (measured at 20.degree. C. for 1 minute according to ASTM standard D 412) lower than 30%.
摘要:
Fuel cell having: (a) an anode; (b) a cathode; (c) a polymer electrolyte membrane placed between the anode and the cathode which has at least one polyolefin grafted with a side chain containing proton conductive functional groups; wherein said fuel cell has a value of cell resistance at 90° C. not higher than 0.30 Ωcm2, preferably having between 0.2 Ωcm2 and 0.25 Ωcm2, more preferably between 0.05 Ωcm2 and 0.20 Ωcm2; a value of cell resistance at 20° C. differing from the value of cell resistance at 90° C. of an amount not higher than 90%, preferably not higher than 70%, more preferably not higher than 50%, with respect to the value of cell resistance at 90° C. Preferably, said fuel cell is a direct methanol fuel cell (DMFC).
摘要:
An electrochemical device including an anode, a cathode and an electrolyte membrane disposed between the anode and the cathode, wherein the electrolyte membrane has a material of formula La1−xSrxGa1−yMGyO3−0.5(x+y), wherein x and y are independently a value of 0.1 to 0.3, said material having a relative density of at least 90% and including LaSrGaO4 in a percentage of 0.05 vol % to 10 vol %. A method for producing energy and a method for separating oxygen from a gas mixture are also disclosed.
摘要:
A proton exchange membrane fuel cell includes at least one membrane-electrode assembly including an electrolyte membrane based on a fluorine free polymer grafted with side chains containing proton conductive functional groups, and interposed between an anode and a cathode, the anode including a catalytic layer including a catalyst and a fluorinated ionomer. The catalytic layer has a fluorine/catalyst ratio that increases in a direction from the electrolyte membrane to an outer surface of the anode.
摘要:
The invention describes a cable, in particular for electric energy transportation or distribution, in which an electrically insulating layer is present, consisting of a material substantially free of lead or derivatives thereof, and having high resistance to water. This material includes an elastomer terpolymer having the following composition: a) 50-90 moles percent of ethylene; b) 10-50 moles percent of an &agr;-olefin; c) 0.16-5 moles percent of 5-vinyl-2-norbornene; the sum of the moles percent of a), b), c) being 100, said terpolymer having a branching index of less than or equal to 0.5 and a molecular weight distribution index Mw/Mn of greater than or equal to 6.