| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical film forming method by a solution casting film forming method which can easily peel a web from a support in a peeling process, can firmly hold a side in the width direction of the web in a stretching process, and can avoid the breaking of the web during the transportation of the web after being peeled. <P>SOLUTION: The optical film 5 forming method includes a casting process for casting a resin solution 2 on the metal support 101a, the peeling process for peeling the web 3 formed on the metal support 101a from the metal support 101a, and the stretching process for stretching the peeled web 3. As the resin of the resin solution 2, an acrylic resin and a cellulose ester resin are contained, As the solvent of the resin solution 2, an alcohol is contained. In the peeling process, when the web 3 is peeled from the metal support 101a, the residual solvent percentage of the web 3 is 20-100 mass%. In the stretching process, the web 3 is stretched by a pin tenter 103d. <P>COPYRIGHT: (C)2012,JPO&INPIT |
