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US 8,147,638 B2Granted
Polarizing plate and display using the same
AssigneeKonica Minolta Opto, Inc.
InventorsKazuyuki Shimizu, Toshiaki Shibue, Takashi Murakami
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Abstract
A polarizing plate comprising a polarizing film having thereon a retardation film containing a plasticizer and a cellulose ester, wherein a free volume radius of the retardation film determined by positron annihilation lifetime spectroscopy is in the range of 0.250-0.310 nm.
Claims4
A method of manufacturing a polarizing plate comprising the steps of:
- (i) casting a dope containing a plasticizer and a cellulose ester on a support to form a web;
- (ii) peeling the web from the support;
- (iii) stretching the web while the web still contains a solvent;
- (iv) further drying the web until an amount of residual solvent decreases to less than 0.3% by weight;
- (v) heat treating the web at 105-155° C. under a rate of atmosphere replacement of 12 times/h or more while the web is transported, to form a retardation film;
- (vi) adhering the retardation film to at least one surface of a polarizing film to form a polarizing plate,
- wherein
- a free volume radius of the retardation film determined by positron annihilation lifetime spectroscopy is in the range of 0.250-0.310 nm.
5 more elements
Dependencies are inferred from the claim text.