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    Foamable engineering thermoplastic compositions
    131.
    发明授权
    Foamable engineering thermoplastic compositions 失效
    可发泡工程热塑性组合物

    公开(公告)号：US4904702A

    公开(公告)日：1990-02-27

    申请号：US317010

    申请日：1989-02-28

    Applicant: Richard B. Allen

    Inventor： Richard B. Allen

    IPC: C08J9/06 ,  C08L67/00 ,  C08L67/02 ,  C08L71/12 ,  C08L101/00

    CPC classification number: C08J9/06 ,  C08J2201/022 ,  C08J2201/024

    Abstract: A foamable composition comprises in admixture (a) a high molecular weight thermoplastic resin in particulate form and an effective amount of (b) a foaming agent therefor comprising a pumpable liquid dispersion comprising (i) a solid blowing agent, (ii) a liquid carrier, and, optionally, (iii) a thickener. The liquid dispersion can be pumped directly into the hopper of a foam molding machine eliminating the need to pre-mix pelletized concentrates of the solid blowing agent.

    Abstract translation: 可发泡组合物包含（a）颗粒形式的高分子量热塑性树脂和有效量的（b）其发泡剂，其包含可泵送液体分散体，其包含（i）固体发泡剂，（ii）液体载体 ，和任选地，（iii）增稠剂。 液体分散体可以直接泵送到泡沫成型机的料斗中，无需预先固定发泡剂的颗粒状浓缩物。

    Low density fluoropolymer foam
    132.
    发明授权
    Low density fluoropolymer foam 有权

    公开(公告)号：US11643520B2

    公开(公告)日：2023-05-09

    申请号：US16645131

    申请日：2018-09-05

    Applicant: Arkema Inc.

    Inventor： Saeid Zerafati ,  Ronald H. Partridge

    IPC: C08J9/32 ,  B29C48/40 ,  B29K105/16

    CPC classification number: C08J9/32 ,  B29C48/40 ,  B29K2105/165 ,  C08J2201/024 ,  C08J2201/03 ,  C08J2203/22 ,  C08J2207/06 ,  C08J2327/16 ,  C08J2433/08

    Abstract: The invention relates to low density fluoropolymer foam, and preferably polyvinylidene fluoride (PVDF) foam, such as that made with KYNAR PVDF resins, and articles made of the foam. The foam is produced by adding microspheres containing blowing agents to the polymer and processing it through an extruder. The microspheres consist of a hard shell containing a physical blowing agent. The shell softens at elevated temperatures and allows the expansion of the blowing agent, and microsphere to create larger voids within the polymer matrix. By proper control of the polymer composition, viscosity, processing temperature, blowing agent selection, loading ratio, and finishing conditions, useful articles such as foamed PVDF pipe, tube, profiles, film, wire jacketing and other articles can be produced. The microspheres may be added to the fluoropolymer matrix by several means, including as part of a masterbatch with a compatible polymer carrier.

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