33results about How to "Low photoelastic coefficient" patented technology

The polycarbonate resin of the invention includes a first structural unit derived from a dihydroxy compound represented by a general formula (1), a second structural unit derived from a dihydroxy compound represented by a general formula (2), and a third structural unit derived from at least one dihydroxy compound selected from the group consisting of a dihydroxy compound represented by a general formula (3), a dihydroxy compound represented by a general formula (4), a dihydroxy compound represented by a general formula (5), and a dihydroxy compound represented by a general formula (6), and in which the first structural unit derived from a dihydroxy compound represented by the general formula (1) accounts for 18% by mole or more of the polycarbonate resin. The above general formulae (1) to (6) are described in the specification of the present application.

The present invention is a composition containing a polyester resin containing at least an alicyclic dicarboxylic acid component and an alicyclic diol component, and it is a polyester resin composition which satisfies that a glass transition temperature is 65° C. or more and 90° C. or less, a refractive index at sodium D line is 1.500 or more and 1.570 or less, a titanium element content is 5 ppm or more and 500 ppm or less, a phosphorus element content is 50 ppm or more and 500 ppm or less and a gel fraction is 50% or less. By the present invention, it is possible to obtain a polyester resin composition having a low refractive index and photoelastic coefficient, and in which a thermally degraded foreign substance is reduced.

[Problem] To provide: an active energy beam-curable composition for optical films that combines a low photoelastic coefficient and low retardation, good resistance to moist heat, and outstanding flexibility; an optical film obtained using said composition; a polarizer protective film; and a polarizing plate. [Solution] An energy beam-curable composition for forming optical films, containing: (A) urethane (meth)acrylate (A) having a photoelastic coefficient at 23°C when cured (hereinafter merely referred to as the "photoelastic coefficient") not exceeding 30 x 10-12Pa-1, and (B) a polymer other than the component (A) and which has a photoelastic coefficient not exceeding 5 x 10-12Pa-1. The photoelastic coefficient when cured does not exceed 10 x 10-12Pa-1, in-plane retardation at the front and at a diagonal of 40° and total retardation in the thickness direction when cured as measured at a thickness of 40mum does not exceed 5nm.

There is provided a liquid crystal panel having an improved contrast ratio in an oblique direction and an improved color shift in an oblique direction. Further, there is provided a liquid crystal panel with excellent display uniformity. The liquid crystal panel of the present invention includes: a liquid crystal cell; a first polarizer arranged on one side of the liquid crystal cell; a second polarizer arranged on the other side of the liquid crystal cell; a first optical element and a second optical element arranged between the first polarizer and the liquid crystal cell; and a third optical element arranged between the second polarizer and the liquid crystal cell, in which: the first optical element has substantially optically negative uniaxial property; the second optical element satisfies the following expressions (1) and (2) and is arranged between the first optical element and the liquid crystal cell; and the third optical element has substantially optical isotr.

A (meth)acrylic resin comprising a (meth)acrylic resin, wherein the (meth)acrylic resin has a repeating unit represented by formula (I) (wherein R1 and R2 independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; and R3 represents a ring structure) and a repeating unit represented by formula (II) (wherein R4 and R5 independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; and R6 represents an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, or an aryl group having 6 to 10 carbon atoms).

A method for preparing optical film includes mixing PMMA mixture with solvent uniformly to form a wet film, heating said wet film to form an optical dried film, enabling to mix PMMA mixture in any ratio as per required property with solvent to form a mixed solution then carrying out heat treatment on mixed solution to obtain optical film.

An object is to provide: an optical film such as a retardation film, the optical film having a low photoelastic coefficient (superior optical characteristics) and being superior in heat resistance and transparency; and a polarizing plate including the film. The optical film contains a polyester resin containing a unit (A) of the following formula (1).