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US 7,008,504 B2Granted
Manufacturing method of polarizing film, polarizing film, optical film, and visual display
AssigneeNitto Denko Corporation
InventorsKazuki Tsuchimoto, Youichirou Sugino, Takashi Shouda
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Abstract
A polarizing film may be manufactured without using adhesives by a method in which a protective film (B) is laminated onto at least one face of a polarizer (A), then adhered by thermocompression bonding. Thus problems on manufacturing method of a polarizing film possibly caused by use of adhesives will not be generated.
Claims21
A manufacturing method of a polarizing film comprising steps of:
- contacting a protective film (B) comprising at least two layers having different softening points onto at least one face of a polarizer (A) comprising a stretched polymer film made of dyed hydrophilic polymer film, without using an adhesive, and
- thermocompression bonding,
- wherein a heating treatment is performed for a period of time of not more than five seconds.
A manufacturing method of a polarizing film comprising steps of:
- contacting a protective film (B) comprising at least two layers having different softening points onto at least one face of a polarizer (A) comprising a dyed hydrophilic polymer film, without using an adhesive, and
- thermocompression bonding,
- wherein a heating treatment is performed for a period of time of not more than five seconds.
Dependencies are inferred from the claim text.