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专利名称：Optical film manufacturing method发明人：岩上 直矢,宮本 宏申请号：JP2016070042申请日：20160331公开号：JP2019090843A公开日：20190613
摘要：The present invention provides a method for producing an optical filmcontaining soluble polyimide as a main component, which is easy to reuse as a returnmaterial and in which retardation unevenness caused by bowing phenomenon andretardation expression during stretching is reduced. A method for producing an opticalfilm containing a soluble, transparent polyimide resin, comprising: casting a dope on asupport to form a cast film; and peeling the cast film from the support; And a step ofstretching the cast film which has been peeled, and when the stretching temperature inthe step of stretching is Tg (.degree. C.) of the glass transition temperature of thepolyimide resin, (Tg-250.degree. C.) to (Tg- A method for producing an optical film whichis within the range of 100 ° C., the change of the film temperature from the start ofstretching to the end of stretching is within 70 ° C., and the stretching temperature is 50 °C. or more higher than the boiling point Tb of the main solvent. . 【Selection chart】None
申请人：コニカミノルタ株式会社
地址：東京都千代田区丸の内二丁目７番２号
国籍：JP
代理人：特許業務法人光陽国際特許事務所
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