KONICA MINOLTA ADVANCED LAYERS, INC. (Tokyo, JP)

The film is optical that has low internal haze, low internal scattering and superior water resistance, even though the film is made up of diacetylcellulose with remarkable properties that induce retardation. A cellulose acetate.alpha is the principal component of the optical film. It has a viscosity of 6 percent between 70 and 250 mPas, as well as an acetyl substitution degree of 2.0 to 2.5. Another cellulose alpha acetate is.beta. It is viscose 6% lower than the cellulose-acetate.alpha. An acetyl substitution rate of 2.0 to 2.5; ester compound B that contains one to twelve pyranose and furanose structures, and where all, or a portion of the OH group of these structures is esterified; and polyesterD identified by formula (1). B-(G-A)n-G-B (1).

Formerly, polarizing plates used in liquid crystal display devices generally had a structure in which an adsorbing elements to a polyvinyl alcohol film was sandwiched between two triacetyl cellulose films. Since the liquid crystal display devices are used in TVs, there have been many varieties of cellulose ester films that have retardation. For example a cellulose propionate film with an optical compensation feature and a film that has been enhanced with a retardation enhancement in triacetylcellulose.

One of the major reasons that retardation was added to a cellulosid was due to the cellulose ester showed an affinity that was high for the polarizer, which is made from polyvinyl alk, which resulted in high productivity of a plate that was polarizing.

A cellulose ester-based film with retardation was found to have the highest degree of substitution using an acyl group in order to keep the moisture resistance of the polarizer.

With the improvement in the properties of liquid crystal display devices, it is now difficult to obtain the required amount of retardation with conventional films. For example, a filmobtained through the incorporation of a retardation-enhancing ingredient into the form of cellulose acetate propionate, or triacetyl film.

Diacetyl cellulose which is a cellulose acetate obtained by decreasing the substitution degree of triacetyl cellulose (also referred to as cellulose diacetate) is easier to provide retardation when compared with a triacetyl cellulose.Accordingly, diacetyl cellulose has been known to be superior to triacetyl cellulose with respect to optical compensation, however, it has not been practically used because the problem of moisture resistance has not been overcome.

To address these problems, in Patent document 1, there is an approach to increase moisture resistance while exhibiting retardation by mixing diacetyl cellulose with a compound that has a negative birefringence like an oligosaccharide or a simple sugar.

However, this approach did not improve the moisture resistance. Furthermore, because the compatibility of the diacetyl cellulose with a simple sugar or an oligosaccharide wasn’t sufficient for the internal haze, or internal scattering of the film enhanced and the brightness of a liquid crystal display device in use was diminished.

Patent Document

Patent Document 1: Japanese Patent Application Open to Public Inspection (hereafter named JP-A). 2010-2749

The invention of solutions to problems

The invention is designed to develop an optical film that has minimal internal haze and internal scattering, as well being extremely resistant to moisture. It also makes use of a diacetylcellulose that has excellent provideretardation properties.

There are ways to solve the problems

The object of the present invention was achieved through the following constructions.

1. A film with optical properties that include:

Acetate of cellulose that has an 6% viscosity range between 70 and 250 mg/mPas, and an acetyl substitute level of 2.0 or greater but less than 2.5;

cellulose acetate .beta. A cellulose acetate.beta. With the viscosity of 6% that is lower than acetate.alpha. and an acetyl substitution rate of 2.0 or greater but less than 2.5

ester compound C containing one or more but twelve or less of at minimum one type of a pyranose or furanose structure, each of, or a portion of OH groups of the at the very least an pyranose structure as well as the furanose structure is being esterified and

Polyester D is represented by the following Formula (I), B-(G-A).sub.n-G-B Formula (1) where B is an arylcarboxylic acid residue, and G is an alkylene glycol compound with 2 to 12 carbon molecules, an aryl glycol residue with 6 to 12 carbon atoms or an oxyalkylene glycol residue with 4 to 12 carbon atoms. The A symbolises an alkylene dicarboxylic acid residue having 4 to 12 carbon atoms or an aryl dicarboxylic acid molecule with 6 to 12 carbon atoms. it is an integer that has 1 or more. 2. The optical film in Item 1. It contains both cellulose Acetates. and .beta. They are created using wood pulp cellulose as raw material. 3. The optical film is in Item 1 or 2.

A retardation in-plane value at 590 nm (Ro590) is 30 to 90 nm, however it is less than 90 nm.

a ratio of a retardation value in the thickness direction of the optical film measured at the wavelength of 590 nm Rth (590) to the in-plane retardation value (590) Rth (590)/Ro(590) is 2.0 or more but 3.0 or less, Ro=(nx-ny).times.dRth=(nx+ny)/2-nz.times.d (in the formulas, nx represents an in-plane refractive index in a slow axis direction, ny represents an in-plane refractive index in a fast axis direction, nz represents a refractive index in the thickness direction of theoptical film and d represents a thickness of the optical film (nm)).

The Effects of Invention

The present invention allows for the development of an optical film having the lowest internal haze and internal scattering, as well as outstanding resistance to moisture, making use of a diacetylcellulose with outstanding provideretardation properties.

Click here to view the patent on USPTO website.

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