Zeon Corporation

Takeshi Asada

Hironari Sudeji

Kensaku Fujii

Hiroya Nishioka

Yusuke Yasu

A phase difference film composed of a resin C containing a copolymer P including a polymerization unit A and a polymerization unit B, the phase difference film including a lamellar phase separation structure that generates a structural birefringence, the phase separation structure including a phase (A) having the polymerization unit A as a main component and a phase (B) having the polymerization unit B as a main component, and the phase difference film satisfying the formulae (1A): f(A)>0.5 and (2):D(A)>D(B), or the formulae (1B): f(B)>0.5 and (2). f(A) represents a total weight ratio of the polymerization unit A in the copolymer P, f(B) represents a total weight ratio of the polymerization unit B in the copolymer P, D(A)=ReA(450)/ReA(550), D(B)=ReB(450)/ReB(550), and ReA(450), ReA(550), ReB(450) and ReB(550) are as defined in the description.

Retardation film and production method for retardation film

A phase difference film composed of a resin containing a copolymer including polymerization units A and B, the phase difference film including a cylindrical phase separation structure that generates a structural birefringence, the phase separation structure including a phase (A) having the polymerization unit A as a main component and a phase (B) having the polymerization unit B as a main component, and the phase difference film satisfying the following condition (1) or (2). Condition (1): D(A)>D(B) and f(B)>0.5, and a direction giving a maximum refractive index among in-plane directions and an orientation direction of a cylinder in the phase separation structure are parallel to each other. Condition (2): D(A)>D(B) and f(A)>0.5, and a direction giving a maximum refractive index among in-plane directions and an orientation direction of a cylinder in the phase separation structure are orthogonal to each other.

A lengthy stretched film made of a thermoplastic resin, having, over the width direction of at least 1300 mm, a value of an orientation angle &#x3b8; to a take-up direction in a range of 40&#xb0; to 50&#xb0; and fluctuation thereof of 1.0&#xb0; or less, and a value of an average Nz coefficient in a range of 1.3 to 2.0 and fluctuation thereof of 0.10 or less. A lengthy circularly polarizing plate constituted by laminating the lengthy stretched film with a lengthy polarizer. A reflective display type liquid crystal display device provided with the circularly polarizing plate constituted by trimming the lengthy circularly polarizing plate to a desired size.

Lengthy stretched film, and manufacturing method and use thereof

A method for producing a stretched film comprising supplying a film composed of a thermoplastic resin along a direction Dthat is different from a taking-up direction Dof a post-stretch film, and obliquely stretching the film while transferring the film with the edges thereof being gripped by gripping devices, to produce the stretched film having an orientation angle &#x3b8; being within 45&#xb1;5&#xb0; with respect to the taking-up direction.

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Tokyo, Japan

Takeshi Asada