Polyvinyl alcohol film

Details Polyvinyl alcohol film Polyvinyl alcohol film

2006-03-21

2006-03-21

Lipman, Bernard (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C524S388000, C524S557000, C525S057000, C525S060000, C525S061000

Reexamination Certificate

active

07015266

ABSTRACT:
The invention is a polyvinyl alcohol film having an YI value of at most 20, which is formed of a modified polyvinyl alcohol having a degree of polymerization of from 1500 to 5000, an ethylene unit content of from 1 to 4 mol % and a 1,2-glycol bond content of at most 1.4 mol %. The polyvinyl alcohol film gives polarizing films that contain no impurities and have good polarization performance, durability and hue stability.

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U.S. Appl. No. 11/118,474, filed May 2, 2005, Hayashi, et al.

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