发明授权
- 专利标题： Optical film, manufacturing method of optical film, optical compensating film, manufacturing method of optical compensating film, polarizing plate, and liquid crystal display
- 专利标题（中）： 光学膜，光学膜的制造方法，光学补偿膜，光学补偿膜的制造方法，偏振片和液晶显示器
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申请号： US11367674申请日： 2006-03-06
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公开(公告)号： US07815823B2公开(公告)日： 2010-10-19
- 发明人: Takashi Murakami , Kunio Shimizu
- 申请人： Takashi Murakami , Kunio Shimizu
- 申请人地址： JP Tokyo
- 专利权人： Konica Minolta Opto, Inc.
- 当前专利权人： Konica Minolta Opto, Inc.
- 当前专利权人地址： JP Tokyo
- 代理机构： Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.
- 优先权： JP2005-066913 20050310; JP2006-026237 20060202
- 主分类号： B29D11/00
- IPC分类号： B29D11/00
摘要：
An object is to provide an optical film in which retardation variation is less even after a long period of duration of use, to provide an optical compensating film in which transparency and flatness are not deteriorated in a stretching process by using the foregoing film as a support, and to provide a polarizing plate and a liquid crystal display exhibiting reduced visibility variation caused by heat generation of an optical LED backlight, and excellent color reproducibility. Disclosed is a manufacturing method of an optical film formed by melt-casting a composition containing a cellulose resin and a plasticizer, wherein the cellulose resin has a residual sulfuric acid content of 0.1-50 ppm, and the composition contains a polymer having a weight average molecular weight of 500-30000 prepared via polymerization of ethylenic unsaturated monomers, or an acrylic polymer having a weight average molecular weight of 500-30000.