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    Process for making polyester photographic film base and photographic element comprising said base
    7.
    发明授权
    Process for making polyester photographic film base and photographic element comprising said base 失效
    制造聚酯照相胶片基材和包含所述碱的照相元件的方法

    公开(公告)号：US06737226B1

    公开(公告)日：2004-05-18

    申请号：US10279891

    申请日：2002-10-24

    申请人： Yuanqiao Rao ,  Jehuda Greener ,  Michael R. Brickey

    发明人： Yuanqiao Rao ,  Jehuda Greener ,  Michael R. Brickey

    IPC分类号： G03C1765

    CPC分类号： C08J5/18 ,  B29C55/143 ,  B29K2067/00 ,  C08J2367/02 ,  G03C1/498 ,  G03C1/7954 ,  G03C5/14 ,  G03C5/16 ,  G03C5/17 ,  G03C2005/168 ,  Y10T428/31786

    摘要： A process for making polyester film base material comprising more than 65 mol % of 1,4-cyclohexanedimethanol (CHDM) of the total glycol component in the polyester material. The film base is prepared by sequentially carrying out the following steps: (a) casting a molten polyester resin in a machine direction onto a casting surface to form a continuous sheet, (b) drafting the sheet by stretching in the machine direction at a stretch ratio of from 2 to 4, and at a temperature ranging from 70° C. to 130° C., (c) tentering the sheet in the transverse direction by stretching at a stretch ratio of from 2 to 4, and at a temperature ranging from 70° C. to 130° C. to obtain a biaxially oriented film, (d) heat-setting the oriented film at an actual temperature of from 160° C. to 200° C., and (e) cooling the heat-set film without substantial detentering to obtain a biaxially oriented, heat-set polyester-based film having a cutting index of 1 to 1.5 and a tensile toughness ranging from 15 to 55 MPa. The invention is also directed towards a silver halide light sensitive photographic element comprising the PET-based film base made by the present process. The photographic film base of the invention exhibits excellent dimensional stability, optical clarity and mechanical strength while also possessing a crystalline morphology that enables finishing by cutting, chopping or perforating techniques at reduced cutting index without requiring a detentering step after heat-setting.

    摘要翻译： 一种制备聚酯薄膜基材的方法，其包含聚酯材料中总二醇组分的多于65mol％的1,4-环己烷二甲醇（CHDM）。 通过依次进行以下步骤制备薄膜基材：（a）在机器方向上将熔融聚酯树脂浇铸到铸造表面上以形成连续薄片，（b）通过在纵向上拉伸拉伸薄片 比例为2至4，温度范围为70℃至130℃，（c）通过以2至4的拉伸比拉伸并在温度范围内将片材横向拉伸 从70℃至130℃，得到双轴取向膜，（d）在160℃至200℃的实际温度下热定形取向膜，（e） 在没有显着的滞留的情况下获得具有1至1.5的切割指数和15至55MPa的拉伸韧性的双轴取向的热固性聚酯基薄膜。 本发明还涉及包含通过本方法制备的基于PET的薄膜基材的卤化银感光照相材料。 本发明的照相胶卷底片显示出优异的尺寸稳定性，光学透明度和机械强度，同时还具有能够以减小的切割指数通过切割，切割或穿孔技术进行精加工的结晶形态，而不需要在热定形之后的定向步骤。