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    • 7. 发明申请
    • Solution casting method and polymer film
    • 溶液浇铸法和聚合物膜
    • US20050077648A1
    • 2005-04-14
    • US10959132
    • 2004-10-07
    • Masaru Sugiura
    • Masaru Sugiura
    • G02B5/30B29C41/26B29D7/01B29K1/00B29L7/00C08J5/18B29C39/14B29C55/06
    • C08J5/18B29C41/26B29D7/01B29K2001/00B29K2001/12C08J2301/12
    • A solvent in which dichloromethane is mixed with alcohol as a poor solvent is used for preparing a dope. Alcohol is supplied to the dope in a inline pipe to mix with a static mixer, such as a casting dope in which a composition of alcohol is increased. The temperature of the rotary drum is adjusted to −7° C. The casting dope is fed from a casting die to the rotary drum so as to form a casting film whose thickness is 40 μm. Since the content of alcohol is high and a storage modulus of the cooled casting film is at least 150 thousands Pa, the peeling defect does not occur, and the stretch is reduced as far as possible. A gel-like film is dried by a tenter type drying device, and stretched such that the stretch ratio is at most 110%. The produced film is thin and excellent in a surface condition and optical isotropy.
    • 将二氯甲烷与醇作为不良溶剂混合的溶剂用于制备涂料。 将酒精以在线管道供应到纺丝原液以与静态混合器混合,例如其中酒精组合物增加的浇注液。 将旋转鼓的温度调节至-7℃。将浇铸液从铸模进料到旋转鼓,以形成厚度为40μm的流延膜。 由于酒精含量高并且冷却的流延膜的储能模量至少为150千帕,所以不会发生剥离缺陷,并且拉伸尽可能地减小。 通过拉幅式干燥装置将凝胶状薄膜干燥,拉伸至伸缩率为110%以下。 所生产的薄膜在表面状态和光学各向同性方面是薄的和优异的。