Title:
POLARIZING FILM
Document Type and Number:
Japanese Patent JP3730397
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve durability and polarizing performance by using a PVA deriv. having a specified polyvinylene structure and imparting a specified dichroism ratio.
SOLUTION: This polarizing film is made of a PVA deriv. having a polyvinytene structure obtd. using PVA having a polymn. degree of ≥2,000 and has a dichroism ratio of ≥20, preferably ≥25, especially preferably ≥30. By the increased polymn. degree, durability and polarizing performance are improved. The upper limit of the polymn. degree is preferably 30,000 from the viewpoint of film forming property. The polymn. degree of PVA is measured in accordance with JIS-K-6726. A method for hot-stretching a film of PVA contg. a dehydration accelerator and having a high polymn. degree in a dry state at a high stretching rate in a low oxygen atmosphere is preferably adopted as a method for increasing the dichroism ratio.
Inventors:
磯▲ざき▼ 孝徳
Application Number:
JP6640598A
Publication Date:
January 05, 2006
Filing Date:
March 17, 1998
Export Citation:
Assignee:
KURARAY CO.,LTD.
International Classes:
G02B5/30; B29D11/00; C08J5/18; C08L29/04; (IPC1-7): G02B5/30; B29D11/00; C08L29/04
Domestic Patent References:
| JP2256002A | ||||
| JP10508123A | ||||
| JP5661431A | ||||
| JP2282201A | ||||
| JP6484203A | ||||
| JP1105204A | ||||
| JP756019A |
Foreign References:
| WO1997021123A1 |