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1. 发明申请

US20200294691A1 FIRE RESISTANT CABLE WITH CERAMIFIABLE LAYER 审中-公开
公开(公告)号：US20200294691A1
公开(公告)日：2020-09-17
申请号：US16301278
申请日：2016-05-17
申请人： PRYSMIAN S.p.A
发明人： Vito SCRIMA , Fabio TOSI , Marco ANDREOLETTI , Carlo CASTELLI
IPC分类号： H01B7/295 , C08K3/36 , C08L23/08 , C08K3/22
摘要： 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.

2. 发明申请

US20210241940A1 FLAME RETARDANT ELECTRICAL CABLE 有权
公开(公告)号：US20210241940A1
公开(公告)日：2021-08-05
申请号：US17049684
申请日：2018-04-26
申请人： PRYSMIAN S.P.A. , POLITECNICO Dl MILANO
发明人： Vito SCRIMA , Luigi CAIMI , Massimo GOLA , Attilio CITTERIO
IPC分类号： H01B7/295 , C08F10/02 , C08K3/36 , C08K3/04
摘要： 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).

3. 发明申请

US20220148760A1 Flame-retardant cable with self-extinguishing coating layer 有权
公开(公告)号：US20220148760A1
公开(公告)日：2022-05-12
申请号：US17454080
申请日：2021-11-09
申请人： Prysmian S.P.A.
发明人： Pauline AUDEBET , Vito SCRIMA , Luigi CAIMI , Flavio CASIRAGHI
IPC分类号： H01B7/295 , C09D5/18 , C09D7/61 , C09D7/63 , C09D123/06 , C09D123/08 , H01B3/44
摘要： A flame-retardant cable having a core is disclosed. The cable contains at least one conductor and a coating made from a low smoke zero halogen flame-retardant polymer composition. The polymer composition contains a halogen free base polymer added with a) less than 170 phr of at least one metal hydroxide; b) from 1 to 10 phr of a phyllosilicate clay; c) at least 1 phr and less than 10 phr of melamine or a derivative thereof; and d) an alkali or alkaline-earth metal carbonate. The cable has improved reaction to fire performances especially in that no dripping occurs during burning, which renders it compliant with the requirements of the more recent international standards.

4. 发明申请

US20170250007A1 FIRE RESISTANT CABLE WITH CERAMIFIABLE LAYER 审中-公开
公开(公告)号：US20170250007A1
公开(公告)日：2017-08-31
申请号：US15510078
申请日：2014-09-12
申请人： PRYSMIAN S.p.A
发明人： Vito SCRIMA , Fabio TOSI
IPC分类号： H01B7/295 , C08K3/36 , C08K3/08 , G02B6/44 , C08L23/08
CPC分类号： H01B7/295 , C08K3/08 , C08K3/36 , C08K2003/0818 , C08L23/0853 , G02B6/443 , G02B6/4432 , G02B6/4436 , H01B13/148
摘要： 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, aluminium 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.

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