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    • 3. 发明授权
    • Process for making polyester photographic film base and photographic element comprising said base
    • 制造聚酯照相胶片基材和包含所述碱的照相元件的方法
    • US06737226B1
    • 2004-05-18
    • US10279891
    • 2002-10-24
    • Yuanqiao RaoJehuda GreenerMichael R. Brickey
    • Yuanqiao RaoJehuda GreenerMichael R. Brickey
    • G03C1765
    • C08J5/18B29C55/143B29K2067/00C08J2367/02G03C1/498G03C1/7954G03C5/14G03C5/16G03C5/17G03C2005/168Y10T428/31786
    • 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.
    • 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。