Composition and process for manufacturing PBT catheter balloons
    2.
    发明授权
    Composition and process for manufacturing PBT catheter balloons 有权
    制造PBT导管气球的组成和工艺

    公开(公告)号:US06465067B1

    公开(公告)日:2002-10-15

    申请号:US09706266

    申请日:2000-11-03

    IPC分类号: B29D2202

    摘要: A processing technique and a composition which allow compositions of PBT polymers or copolymers to be formed into blow molded articles, especially medical balloons such as dilatation or stent placement balloons, from extruded tubular parisons. The process includes a longitudinal stretch step run at a temperature below the Tg of the polymeric material and a radial expansion step run at a temperature above the Tg of the polymeric material. During the longitudinal stretch step, the tubing is subjected to high internal pressure. In the composition a small amount of boric acid is added to the polybutylene terephthalate in a melt blend to give a formulation which has reduced crystallinity after extrusion and which can more readily fashioned into high strength blow molded articles than PBT by itself. Articles, which may be formed using the invention include medical device balloon articles in which the polymer consists essentially of PBT optionally blended with boric acid.

    摘要翻译: 一种加工技术和组合物,其允许PBT聚合物或共聚物的组合物从挤出的管状型坯形成吹塑制品,特别是医疗气囊如膨胀或支架放置气球。 该方法包括在低于聚合物材料的Tg的温度下运行的纵向拉伸步骤和在高于聚合物材料的Tg的温度下运行的径向膨胀步骤。 在纵向拉伸步骤期间,管道受到高的内部压力。 在组合物中,在熔融共混物中将少量硼酸加入到聚对苯二甲酸丁二醇酯中,得到挤出后结晶度降低且比PBT本身更容易形成高强度吹塑制品的制剂。 可以使用本发明形成的制品包括其中聚合物基本上由PBT任选与硼酸共混的医疗装置球囊制品。