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    Flame retardant electrical cable
    2.
    发明授权
    Flame retardant electrical cable 有权

    公开(公告)号：US12033772B2

    公开(公告)日：2024-07-09

    申请号：US17049684

    申请日：2018-04-26

    Applicant: PRYSMIAN S.P.A. ,  POLITECNICO DI MILANO

    Inventor： Vito Scrima ,  Luigi Caimi ,  Massimo Gola ,  Attilio Citterio

    IPC: H01B7/295 ,  C08F10/02 ,  C08K3/04 ,  C08K3/36 ,  B82Y40/00

    CPC classification number: H01B7/295 ,  C08F10/02 ,  C08K3/041 ,  C08K3/36 ,  B82Y40/00

    Abstract: Disclosed herein are flame-retardant electric cables (10) having a core containing an electric conductor (11) and an electrically insulating layer (12) made from a flame-retardant polyolefin-based composition including a) a cross-linked polyolefin as base polymer, b) silica, and c) carbon nanotubes, wherein the amount of silica is from 5 wt % to 10 wt % of the polyolefin-based composition, and the amount of carbon nanotubes is from 0.5 wt % to 2 wt % of the polyolefin-based composition. Such cables have improved flame retardant performances, especially regarding a lower occurrence of droplets during burning, which render them capable of being certified in higher classes of the current international standards, for example of the standard EN 50399:2011/A1 (2016).

    Fire resistant cable with ceramifiable layer
    3.
    发明授权
    Fire resistant cable with ceramifiable layer 有权

    公开(公告)号：US10068684B2

    公开(公告)日：2018-09-04

    申请号：US15510078

    申请日：2014-09-12

    Applicant: PRYSMIAN S.p.A.

    Inventor： Vito Scrima ,  Fabio Tosi

    IPC: G02B6/44 ,  H01B7/295 ,  C08L23/08 ,  C08K3/08 ,  C08K3/36

    Abstract: A fire resistant cable comprising: at least one conducting element; at least one layer, surrounding said conducting element, made of a ceramifiable composition comprising: a polymeric material comprising an ethylene/vinyl acetate copolymer as main polymer; at least 25 wt % of silica; a fluxing agent selected from alkaline metal oxides or precursors thereof; a stabilizing agent comprising at least one of MgO, CaO, PbO, B2O3, or a precursor thereof; from 0.1 wt % to 5 wt % of a hydroxide selected from magnesium hydroxide, aluminum hydroxide and mixtures thereof; the above percentages being expressed with respect to the weight of the ceramifiable composition. Upon exposure to elevated temperatures such as those encountered in case of fire, the ceramifiable composition is transformed into a ceramic material capable of protecting the conducting element from fire and mechanical stresses. The fire resistant cable of the present invention can continue operating under fire conditions for a certain period of time.

    Fire resistant cable with ceramifiable layer
    6.
    发明授权
    Fire resistant cable with ceramifiable layer 有权

    公开(公告)号：US10854356B2

    公开(公告)日：2020-12-01

    申请号：US16301278

    申请日：2016-05-17

    Applicant: PRYSMIAN S.p.A.

    Inventor： Vito Scrima ,  Fabio Tosi ,  Marco Andreoletti ,  Carlo Castelli

    IPC: H01B7/295 ,  C08K3/36 ,  C08L23/08 ,  C08K3/22

    Abstract: A fire resistant cable comprising: a conducting element (2; 21); a layer, surrounding the conducting element, made of a ceramifiable composition comprising: —a thermoplastic polymer mixture comprising: (a) a copolymer of ethylene with a C4-C12 alpha-olefin, having a density of from 0.860 to 0.910 g/cm3, a melt flow index not higher than 3 g/10 min and a melting point of 105° C. at most; (b) an ethylene homopolymer or copolymer of ethylene with a C4-C12 alpha-olefin, having a density of from 0.900 to 0.985 g/cm3, a melt flow index not higher than 5 g/10 min and a melting point of at least 110° C.; and (c) a polyethylene grafted with an ethylenically unsaturated monomer; —at least 25 wt % of silica; —a fluxing agent selected from alkaline metal oxides or precursors thereof; —an inorganic hydroxide compound selected from magnesium hydroxide, aluminium hydroxide and mixtures thereof; —a stabilizing agent comprising a hydrated magnesium silicate in an amount of at least 5 wt %; weight percentages being based on the total weight of the ceramifiable composition. Upon exposure to elevated temperatures such as those encountered in case of fire, the ceramifiable composition is transformed into a ceramic material capable of protecting the conducting element from fire and mechanical stresses. The fire resistant cable of the present invention can continue operating under fire conditions for a certain period of time.

    PROCESS FOR RECOVERING WASTES OF A POLYMERIC COMPOSITION INCLUDING A PEROXIDIC CROSSLINKING AGENT
    7.
    发明申请
    PROCESS FOR RECOVERING WASTES OF A POLYMERIC COMPOSITION INCLUDING A PEROXIDIC CROSSLINKING AGENT 有权
    用于回收包含过氧化物交联剂的聚合物的废物的方法

    公开(公告)号：US20150284528A1

    公开(公告)日：2015-10-08

    申请号：US14441335

    申请日：2012-11-14

    Applicant: PRYSMIAN S.P.A.

    Inventor： Franco Galletti ,  Vito Scrima

    IPC: C08J11/28 ,  H01B7/17 ,  H01B7/00

    CPC classification number: C08J11/28 ,  C08J11/06 ,  C08J2315/00 ,  C08J2323/08 ,  C08J2323/16 ,  C08K5/005 ,  C08K5/14 ,  C08L2207/20 ,  H01B3/441 ,  H01B7/0045 ,  H01B7/17 ,  Y02W30/701

    Abstract: A process for recovering wastes of a polymeric composition including at least one peroxide-curable polymer and at least one peroxidic crosslinking agent, which includes compounding the wastes with at least one antioxidant agent suitable for sulfur-vulcanized elastomeric compositions, at a temperature lower than the decomposition temperature of the at least one peroxide crosslinking agent. These antioxidant agents are effective to quench the peroxide crosslinking agent, so as to avoid any substantial crosslinking of the composition during processing of the same. The compounding of the polymeric wastes with the antioxidant agent is carried out at a temperature lower than the decomposition temperature of the peroxide crosslinking agent, so as to avoid any premature activation of the crosslinking agent. The process is particularly suitable for compositions based on elastomeric polyolefins, more preferably for elastomeric ethylene copolymers such as ethylene-propylene copolymers (EPR) and ethylene-propylene-diene terpolymers (EPDM), which can be processed at relatively low temperatures, much lower than the decomposition temperatures of the most common peroxide crosslinking agents.

    Abstract translation: 一种用于回收包含至少一种可过氧化物固化的聚合物和至少一种过氧化交联剂的聚合物组合物的废物的方法，其包括将废物与至少一种适用于硫磺硫化的弹性体组合物的抗氧化剂混合在低于 所述至少一种过氧化物交联剂的分解温度。 这些抗氧化剂有效地猝灭过氧化物交联剂，以避免组合物在其加工过程中发生任何实质性的交联。 聚合物废物与抗氧化剂的混合在低于过氧化物交联剂的分解温度的温度下进行，以避免交联剂过早活化。 该方法特别适用于基于弹性体聚烯烃的组合物，更优选用于弹性体乙烯共聚物如乙烯 - 丙烯共聚物（EPR）和乙烯 - 丙烯 - 二烯三元共聚物（EPDM），其可以在比较低的温度下加工，远低于 最常见的过氧化物交联剂的分解温度。

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