Steroid intermediates
    12.
    发明授权
    Steroid intermediates 失效
    类固醇中间体

    公开(公告)号:US4882439A

    公开(公告)日:1989-11-21

    申请号:US910526

    申请日:1986-09-19

    申请人: David N. Jones

    发明人: David N. Jones

    摘要: Total synthesis of steroids with substitution in the 2,3, 6, 11 or 17 positions comprising the step of cyclization of a compound having the formula ##STR1## or analogues thereof, where X represents .dbd.O, ##STR2## or .beta.-substituted ##STR3## Y represents .dbd.O, .beta.-oriented ##STR4## or .beta.-orientated OH, R' and R.sup.2 may be the same or different and R' represents alkyl or aryl and R.sup.2 represents alkyl and Z represents ether or hindered ester to form the novel compounds ##STR5##

    摘要翻译: 包括在2,3,6,11或17位置取代的类固醇的总合成,包括使具有式(1)的化合物或其类似物环化的步骤,其中X表示= O 或者β取代的Y,Y表示= O,β取向的图像或β取向的OH,R'和R 2可以相同或不同,R'表示烷基或芳基,R 2表示烷基或 Z表示醚或受阻酯以形成新化合物。(2)图像(2A)

    Process for forming film from low strain hardening polymers
    13.
    发明授权
    Process for forming film from low strain hardening polymers 失效
    从低应变硬化聚合物形成薄膜的方法

    公开(公告)号:US4415711A

    公开(公告)日:1983-11-15

    申请号:US394672

    申请日:1982-07-02

    申请人: David N. Jones

    发明人: David N. Jones

    摘要: A process is disclosed for forming blown film of a low strain hardening polymer, such as a low pressure polymerized-low density ethylene copolymer, including an improved film bubble expanding technique which permits high production rates to be achieved with good film bubble stability. Advantageously, most of the films produced by the process have a relatively high degree of film clarity.

    摘要翻译: 公开了一种用于形成低应变硬化聚合物的吹塑薄膜的方法,例如低压聚合低密度乙烯共聚物,其包括改进的薄膜气泡膨胀技术,其允许以良好的膜泡稳定性实现高生产率。 有利地,通过该方法生产的大多数膜具有相对高的膜透明度。

    Method and apparatus for cooling film bubble of low strain hardening
polymers
    15.
    发明授权
    Method and apparatus for cooling film bubble of low strain hardening polymers 失效
    低应变硬化聚合物冷却膜气泡的方法和装置

    公开(公告)号:US4330501A

    公开(公告)日:1982-05-18

    申请号:US164293

    申请日:1980-06-30

    CPC分类号: B29C47/8835 B29C47/0026

    摘要: A process and apparatus are disclosed for forming blown film of a low strain hardening polymer, such as a low pressure polymerized-low density ethylene copolymer, including an improved film bubble cooling technique which permits high production rates to be achieved with good film bubble stability. The disclosed process comprises cooling a molten film bubble by contacting the outside of the film bubble with separate annular streams of cooling fluid fed through at least two stacked annular cooling rings disposed around the film bubble, wherein all or substantially all of the cooling fluid exits the system through a common plane formed by the last cooling ring.The disclosed apparatus comprises means for forming a molten film bubble and means for cooling same including at least two separate annular cooling rings disposed around the bubble, each provided with means for feeding an annular cooling fluid stream against the bubble and further including means whereby all or substantially all of said cooling fluid exits the system through a common plane formed by the last cooling ring.

    摘要翻译: 公开了一种用于形成低应变硬化聚合物的吹塑薄膜的方法和设备,例如低压聚合低密度乙烯共聚物,包括改进的薄膜气泡冷却技术,其可以以良好的膜泡稳定性实现高生产率。 所公开的方法包括通过使薄膜气泡的外部与通过设置在膜气泡周围的至少两个堆叠的环形冷却环进料的冷却流体的单独的环形流来冷却熔融膜气泡,其中全部或基本上所有的冷却流体离开 系统通过由最后一个冷却环形成的共同平面。 所公开的装置包括用于形成熔融膜气泡的装置和用于冷却装置的装置,其包括设置在气泡周围的至少两个分离的环形冷却环,每个设置有用于将环形冷却流体流供给气泡的装置,并且还包括装置, 基本上所有的冷却流体通过由最后一个冷却环形成的公共平面离开系统。