Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
MANUFACTURE OF IODINE-BASED POLARIZING FILM
Document Type and Number:
Japanese Patent JP2000241626
Kind Code:
A
Abstract:

To provide an iodine-based polarizing film having high contrast by immersion-treating a PVA film in boric-acid containing aqueous solution with continuously pouring a sulfite into the boric-acid containing aqueous when the PVA film is immersion-treated.

A sulfite is added continuously or intermittently into boric-acid containing aqueous solution for immersion treatment. For composition of this boric-acid containing aqueous solution, weight ratio of water: boric acid: potassium iodine is usually about 100: (2-15):(2-20), preferably 100: (5-12):(5-15). Temperature of the boric-acid containing aqueous solution, for example 50°C, preferably, a range from 50°C to 85°C. In this case, as sulfite added to the boric-acid containing aqueous solution, for example, sulfite metal salt such as potassium sulfite or sodium sulfite is used. As a PVA film, a film produced from PVA having about 1,000-10,000 polymerization degree, preferably 1,500-5,000 is used.


Inventors:
MATSUMOTO KOJI
HAYASHI SHIGETOSHI
KURATA NOBUYUKI
Application Number:
JP3849299A
Publication Date:
September 08, 2000
Filing Date:
February 17, 1999
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
SUMITOMO CHEMICAL CO
International Classes:
G02B5/30; G02F1/1335; (IPC1-7): G02B5/30; G02F1/1335
Domestic Patent References:
JPH02275905A1990-11-09
JPH1090517A1998-04-10
JPS55126202A1980-09-29
JPH0243504A1990-02-14
JPH1039137A1998-02-13
Attorney, Agent or Firm:
Takashi Kuboyama (1 person outside)



 
Previous Patent: OPTICAL FILTER SIMULATING LENS, MANUFACTURE OF OPTICAL FILTER SIMULATING LENS AND SIMULATED EXPERIEN...

Next Patent: POLARIZING PLATE PROTECTIVE FILM, MANUFACTURE THEREOF AND POLARIZING PLATE USING THE FILM