PRODUCTION OF POLARIZING FILM - Sumitomo Chemical Co., Ltd.

Title:

PRODUCTION OF POLARIZING FILM

Document Type and Number:

Japanese Patent JP3680709

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To produce an iodine-containing polarizing film which undergoes slight deterioration in its optical performance under high heat and humidity and exhibits high durability.
SOLUTION: When a polyvinyl alcohol film subjected to uniaxial stretching and iodine adsorption and orientation treatment is immersed in a boric acid- containing aqueous solution to produce an iodine-containing polarizing film, the boric acid-containing aqueous solution is kept at ≤pH 4.5. The boric acid- containing aqueous solution used once in boric acid treatment is effectively reused while keeping the pH at ≤4.5.

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Inventors:

Koji Matsumoto
Hayashi
Nobuyuki Kurata

Application Number:

JP2000207961A

Publication Date:

August 10, 2005

Filing Date:

July 10, 2000

Export Citation:

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Assignee:

Sumitomo Chemical Co., Ltd.

International Classes:

G02B5/30; G02F1/1335; (IPC1-7): G02B5/30; G02F1/1335

Domestic Patent References:

JP6254958A

Attorney, Agent or Firm:

Takashi Kuboyama
Toru Nakayama

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