Nitto-denko Corporation

Nippon Shokubai Co., Ltd.

Michihito Ooishi

Kentarou Takeda

Seiji Umemoto

Takuya Nakazono

Masayuki Satake

Satoshi Hirata

Tatsuya Yamasaki

Satoshi Itou

Narifumi Ueda

Provided are a system and a method for manufacturing an optical display device and a material roll, which can effectively prevent the production of defective optical display devices even in a process including drawing a long sheet material from a material roll and bonding an optical film to an optical display unit, and which is a roll of a laminate of a first base film, a first pressure-sensitive adhesive layer, an optical film, a second pressure-sensitive adhesive layer, and a second base film, which are wound in the roll in this order from the outside, and has a width corresponding to the length of any one side of a rectangular optical display unit, wherein the adhering strength A of the first base film-side interface of the first pressure-sensitive adhesive layer, the adhering strength B of the optical film-side interface of the first pressure-sensitive adhesive layer, the adhering strength C of the optical film-side interface of the second pressure-sensitive adhesive layer, and the adhering strength D of the second base film-side interface of the second pressure-sensitive adhesive layer satisfy the relations A&#x3c;B and A&#x3c;C&#x3c;D.

Material roll and system and method for manufacturing optical display device

Provided are a material roll and a method for manufacturing the material roll in which lifting between base films and an optical film is hardly generated. Provided is a material roll (R), wherein a first base film (F), a first pressure-sensitive adhesive layer (F), an optical film (F), a second pressure-sensitive adhesive layer (F) and a second base film (F) are wounded together in a manner that said layers are laminated in said order from outer side. An adhesive power A of the first pressure-sensitive adhesive layer (F) at an interface on the first base film (F) side, an adhesive power B of the first pressure-sensitive adhesive layer (F) at an interface on the optical film (F) side, an adhesive power C of the second pressure-sensitive adhesive layer (F) at an interface on the optical film (F) side, and an adhesive power D of the second pressure-sensitive adhesive layer (F) at an interface on the second base film (F) side satisfy the relationships A&#x3c;B and A&#x3c;C&#x3c;D. Lifting between base films (F, F) and optical film (F) can be made unlikely to generate by winding the optical film (F) in a manner that the second base film (F), that has greater adhesive power is in an inside.

Material roll and method for manufacturing material roll

The present invention provides a polarizing plate excellent in adherence (particularly, under high-temperature and high-humidity conditions) between a polarizer and a protective film. The polarizing plate of the present invention includes: a polarizer; an adhesive layer; an easy-adhesion layer formed of an easy-adhesive composition containing a urethane resin having a carboxyl group and a cross-linking agent; and a protective film containing a (meth)acrylic resin.

Polarizing plate, and image display device having polarizing plate

Growing community of inventors

Ibaraki, Japan

Michihito Ooishi