Mixture of rough and spheroidized resin particles
    62.
    发明授权
    Mixture of rough and spheroidized resin particles 失效
    粗糙和球化树脂颗粒的混合物

    公开(公告)号:US4243794A

    公开(公告)日:1981-01-06

    申请号:US949956

    申请日:1978-10-10

    CPC classification number: B01J8/08 C08J3/12 C09D5/031 Y10S525/934

    Abstract: Free flowing resin powder which upon striking a heated article fuses, flows and hardens to provide a protective coating, which powder consists of a mixture of rough and rounded particles, the rough particles having a granular appearance as a result of being pulverized and the rounded particles having smooth, glossy, spheroidized surfaces as a result of being briefly heated to a temperature above the softening point. Preferably each particle of the powder is a blend of thermosetting resin and curing agent.

    Abstract translation: 自由流动的树脂粉末在被加热的物体上熔化,流动并硬化以提供保护涂层,该粉末由粗糙和圆形颗粒的混合物组成,粗糙颗粒具有被粉碎的颗粒状外观和圆形颗粒 由于短暂加热到高于软化点的温度,具有光滑,有光泽,球化的表面。 优选地,粉末的每个颗粒是热固性树脂和固化剂的共混物。

    Process for polymerizing olefin in a gas phase reactor with improved thermal homogeneity

    公开(公告)号:US12018102B2

    公开(公告)日:2024-06-25

    申请号:US17051204

    申请日:2019-05-29

    Applicant: BOREALIS AG

    Abstract: The present invention relates to a process for polymerizing at least one olefin in gas phase in a fluidized bed in a polymerization reactor having a top zone of a generally conical shape as such that the equivalent cross-sectional diameter is monotonically decreasing with respect to the flow direction of the fluidization gas, a middle zone in direct contact with and below said top zone of a generally cylindrical shape and a bottom zone in direct contact and below said middle zone and of a generally conical shape as such that the equivalent cross-sectional diameter is monotonically increasing with respect to the flow direction of the fluidization gas, comprising the steps of: a) introducing a first stream of fluidization gas into the bottom zone; b) polymerizing at least one olefin in the presence of a polymerization catalyst in the fluidized bed formed by particles of a polymer of the at least one olefin suspended in an upwards flowing stream of the fluidization gas in the middle zone; c) withdrawing a second stream comprising the fluidization gas and optionally particles of a polymer of the at least one olefin from the top zone; characterized in that the temperature of the particles of the polymer of the at least one olefin in the fluidized bed (TPP) does not exceed 120% of the operating temperature set point (TS) of the polymerization reactor, wherein TPP and TS are both given in ° C., and the use of said process for polymerizing an olefin homo- or copolymer having a narrow particle size distribution.

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