Tosoh Corporation

Shinsuke Toyomasu

Takahiro Kitagawa

Shinji Shimosato

Tohru Doi

Toru Doi

Koji Tanaka

Yasumi Tanaka

Yasuyoshi Fujii

Masayasu Ito

Takashi Fukuda

Kenichi Makita

Naoto Obara

Kentaro Iwanaga

Tadashi Usuki

Kazuyasu Higashiyama

Hiroaki Furukawa

Yojiro Ikai

Sou Ozaki

A resin composition including from 30 to 99 wt % of a cellulose-based resin represented by the following formula (1) and from 70 to 1 wt % of a fumaric acid ester polymer containing 30 mol % or more of a fumaric acid diester residue unit represented by the following formula (2); an optical compensation film using the same; and a production method of the optical compensation film. (wherein Rto Rrepresent a substituent having a carbon number of 1 to 12, and Rand Rrepresent an alkyl group having a carbon number of 1 to 12).

Resin composition, optical compensation film using same, and production method for same

A resin composition containing a specific cellulose-based resin and a specific fumaric acid diester polymer in a specific blending ratio or containing, as the resin component, a specific cellulose-based resin and a specific fumaric acid diester polymer in a specific blending ratio and containing the resin component and an additive having an aromatic hydrocarbon ring or the like in a specific blending ratio. An optical compensation film can be produced using the resin composition.

Resin composition, optical compensation film using the same and production method of optical compensation film

To provide a novel diisopropyl fumarate-cinnamic acid derivative-based copolymer expected to be formed into a retardation film having excellent optical properties ensuring that, for example, the refractive index in the film thickness direction and the out-of-plane retardation are large and even in the form of a thin film, the film has a high out-of-plane retardation, and a retardation film using the same. The diisopropyl fumarate-cinnamic acid derivative-based copolymer contains: a diisopropyl fumarate residue unit; and a cinnamic acid residue unit or a cinnamic acid ester residue unit having an alkyl group with a carbon number of 1 to 6.

Diisopropyl fumarate-cinnamic acid derivative copolymer and retardation film using the same

A fumaric acid diester based resin containing a dipropyl fumarate residue unit and a fumaric acid diester residue unit having a C1 or C2 alkyl group, wherein in a retardation film composed of the resin, when a refractive index in the fast axis direction within the film plane is designated as nx, a refractive index in the film in-plane direction orthogonal thereto is designated as ny, and a refractive index in the thickness direction of the film is designated as nz, the respective refractive indices are satisfied with a relationship of (nx&#x2266;ny&#x3c;nz) and a relationship between a film thickness and an out-of-plane retardation measured at a wavelength of 550 nm and expressed by the specific equation is 4.5 nm/film thickness (&#x3bc;m) or more in terms of an absolute value.

Fumaric acid diester based resin for retardation film and retardation film comprising the same

Optical compensation layers are provided which have an optically compensating function imparted thereto upon coating fluid application or upon coating fluid application and subsequent uniaxial stretching and which have a small wavelength dependence of retardation. The invention provides: an optical compensation layer wherein the compensation layer is a coating layer comprising a maleimide resin and wherein when two arbitrary axes perpendicular to each other in the plane of the coating layer are referred to as x-axis and y-axis, respectively, and the out-of-plane direction is referred to as z-axis, then the coating layer satisfies the three-dimensional refractive-index relationship nx&#x2248;ny&#x3e;nz, wherein nx is the refractive index in the x-axis direction, ny is the refractive index in the y-axis direction, and nz is the refractive index in the z-axis direction; an optical compensation film which comprises a coating layer (A) comprising a maleimide resin and a stretched-film layer (B); and an optical compensation layer, which is an optical compensation layer obtained by uniaxially stretching a coating layer comprising a maleimide resin, wherein when the direction of stretching axis in the coating layer is referred to as x-axis, the direction perpendicular to the stretching direction is referred to as y-axis, and the out-of-plane direction is referred to as z-axis, then the optical compensation layer satisfies the three-dimensional refractive-index relationship nx4&#x3e;ny4&#x3e;nz4, wherein nx4 is the refractive index in the x-axis direction, ny4 is the refractive index in the y-axis direction, and nz4 is the refractive index in the z-axis direction. (wherein Rrepresents a linear alkyl group, a branched alkyl group, or a cycloalkyl group, having 1-18 carbon atoms, a halogen group, an ether group, an ester group, or an amide group).

Optical compensation layer, optical compensation film, and processes for producing these

A wide-viewing angle compensation film contains a polarizing plate and an optical compensation film which exhibits negative birefringence and has an in-plane retardation (Re) of 60-220 nm and an orientation parameter (Nz) in the range of 0&#xb1;0.05, the optical compensation film exhibiting negative birefringence and the polarizing plate being stacked so that the slow axis of the compensation film is perpendicular or parallel to the absorption axis of the polarizing plate; and a transmission type liquid-crystal display contains a liquid-crystal cell and the wide-viewing angle compensation film disposed on at least one side of the cell.

Wide-viewing angle compensation film and transmission type liquid-crystal display employing the same

A transparent heat-resistant resin optical materials having excellent heat resistance and dynamic characteristics, having negative birefringence and exhibiting a high refractive index and a high Abbe number, especially optical compensating members such as films, sheets and retardation films for LCD display element. The transparent heat-resistant resin optical material is made of a copolymer containing a specific olefin residue unit and a specific N-phenyl-substituted maleimide residue unit and having a weight average molecular weight, as reduced into standard polystyrene, of from 5&#xd7;10to 5&#xd7;10, the transparent heat-resistant resin optical material exhibiting negative birefringence; and a retardation film having a relationship of three-dimensional refractive indexes of nz&#x2267;ny&#x3e;nx, nz&#x3e;ny&#x2267;nx, or nz&#x3e;nx&#x2267;ny.

Transparent heat-resistant resin optical material and film

Polyvinyl chloride based resin compositions improved in the vibrational energy absorbing ability are disclosed. The compositions comprises a specific class of phthalic acid esters and a specific class of phosphori acid esters. Articles formed of the compositions are also disclosed.

Growing community of inventors

Mie, Japan

Shinsuke Toyomasu