Composite material with EMI shielding properties and process to produce it
摘要
說明書
For example, at least one polypropylene resin is selected from a virgin polypropylene resin, a polypropylene post-consumer resin and a blend of a virgin polypropylene resin and a polypropylene post-consumer resin.
For example, at least one polypropylene resin is selected from a propylene homopolymer, a copolymer of propylene with one or more comonomers selected from ethylene and C4-C20 alpha-olefins, a heterophasic polypropylene and any mixture thereof. In a preferred embodiment, at least one polypropylene resin is selected from a copolymer of propylene with one or more comonomers selected from ethylene and C4-C20 alpha-olefins, a heterophasic polypropylene and any mixture thereof.
In an example, at least one polypropylene resin is or comprises a homopolymer of propylene. A propylene homopolymer according to this disclosure has less than 0.2 wt. %, preferably, less than 0.1 wt. %, more preferably, less than 0.05 wt. % and most preferably, less than 0.005 wt. %, of alpha-olefins other than propylene in the polymer. Even most preferably, no other alpha-olefins are detectable. Accordingly, when a polypropylene resin is a homopolymer of propylene, the comonomer content in the polypropylene is less than 0.2 wt. %, more preferably, less than 0.1 wt. %, even more preferably, less than 0.05 wt. % and most preferably, less than 0.005 wt. % based on the total weight of the polypropylene.
