THERMOPLASTIC COMPOSITIONS HAVING GOOD DIELECTRIC AND DUCTILITY PROPERTIES

    公开(公告)号:US20200010674A1

    公开(公告)日:2020-01-09

    申请号:US16458579

    申请日:2019-07-01

    Abstract: A thermoplastic composition includes from 29.9 wt % to 84.9 wt % of a base resin including poly(p-phenylene oxide) (PPO), polystyrene (PS) and an impact modifier; from 15 wt % to 70 wt % of a dielectric filler; and from 0.1 wt % to 10 wt % of an impact promoter including a polycarbonate-siloxane copolymer, a polyolefin-siloxane copolymer, or a combination thereof. The thermoplastic composition has a dielectric constant (Dk) of from 3.0-8.0 between 1 and 5 gigahertz (GHz) and a dissipation factor (Df) of less than 0.003 between 1 and 5 GHz. Articles including the thermoplastic composition, and in particular telecommunications devices, are also described.

    POLYMER COMPOSITION COMPRISING POLYCARBONATE AND ABS WITH IMPROVED HEAT AGEING AND SURFACE APPEARANCE PROPERTIES

    公开(公告)号:US20190352498A1

    公开(公告)日:2019-11-21

    申请号:US16466470

    申请日:2017-12-04

    Abstract: The invention relates to a process for the preparation of a final heterophasic propylene copolymer (A) having a final melt flow rate in the range from 65 to 110 dg/min, comprising visbreaking an intermediate heterophasic propylene copolymer (A′) having an intermediate melt flow rate, which intermediate melt flow rate is lower than the final melt flow rate, to obtain the final heterophasic propylene copolymer, wherein the intermediate heterophasic propylene copolymer (A′) consists of (a) a propylene-based matrix, (b) a dispersed ethylene-α-olefin copolymer, wherein the sum of the total amount of propylene-based matrix and total amount of the dispersed ethylene-α-olefin copolymer in the intermediate heterophasic propylene copolymer is 100 wt % based on the intermediate heterophasic propylene copolymer.

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