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Polyurethane resin comprising alicyclic component and/or aromatic component and phase difference film using the polyurethane resin

A technology of polyurethane resin and phase difference film, which is applied in the field of polyurethane resin, can solve problems such as film thermal degradation, and achieve sufficient heat resistance without reducing the phase difference

Inactive Publication Date: 2010-10-13
TOYO KOHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To express retardation on the film, it is necessary to heat the film to a temperature above Tg for stretching, but a temperature above 200°C may cause thermal deterioration of the film, and it is difficult for these films to be stretched to exhibit retardation

Method used

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  • Polyurethane resin comprising alicyclic component and/or aromatic component and phase difference film using the polyurethane resin
  • Polyurethane resin comprising alicyclic component and/or aromatic component and phase difference film using the polyurethane resin
  • Polyurethane resin comprising alicyclic component and/or aromatic component and phase difference film using the polyurethane resin

Examples

Experimental program
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Effect test

Embodiment 1

[0125] 45.2 parts by weight of 4,4'-dicyclohexylmethane diisocyanate was put into the reaction vessel, and 240 parts by weight of dimethylformamide was added to dissolve it. Next, stirring this solution, a solution of 24.8 parts by weight of 1,4-cyclohexanedimethanol dissolved in 40 parts by weight of dimethylformamide was slowly added. After completion of addition, reaction was performed at 130° C. for 4 hours, the reaction solution was poured into methanol, and the generated resin was deposited. The precipitated resin was vacuum-dried at 80°C.

[0126] The NMR spectrum of the resin produced in this way is shown in Figure 1. In addition, the evaluation results of heat resistance, molecular weight, optical properties, strength, and applicability are shown in Table 1.

Embodiment 2

[0128] 44.4 parts by weight of 4,4'-diphenylmethane diisocyanate was put into the reaction vessel, and 240 parts by weight of dimethylformamide was added to dissolve it. Next, stirring this solution, a solution of 25.59 parts by weight of 1,4-cyclohexanedimethanol dissolved in 40 parts by weight of dimethylformamide was slowly added. After completion of addition, reaction was performed at 130° C. for 4 hours, the reaction solution was poured into methanol, and the generated resin was deposited. The precipitated resin was vacuum-dried at 80°C.

[0129] Table 1 shows the evaluation results of heat resistance, molecular weight, optical properties, strength, and coatability of the resin thus prepared.

Embodiment 3

[0131] 21.28 parts by weight of 1,4-cyclohexanedimethanol was put into a reaction container, and 30 parts by weight of a solvent dimethylformamide was added, and it heated to 110 degreeC in nitrogen atmosphere. Next, 38.72 parts by weight of 4,4'-dicyclohexylmethane diisocyanate was added at a rate of 1 part by weight per minute, and 10 parts by weight of a solvent (dimethylformamide) was further added. After the addition was complete, a reaction was carried out at 130° C. for 23 hours. Next, the temperature of the reaction container was raised to 220° C., and the solvent was removed under a reduced pressure of about 5 Torr, and then the resin was extruded from the reaction container to form particles.

[0132] Table 1 shows the heat resistance, molecular weight, optical properties, strength, and coatability of the melt-extruded film of this resin.

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Abstract

Disclosed is a polyurethane resin for a phase difference film. Also disclosed is a phase difference film that is free from heat deterioration of the film even after a step of heating the film to a temperature at or above the glass transition temperature (Tg) and then stretching the heated film and does not cause a lowering in phase difference even when the stretched film is used under high temperatures, for example, within an automobile in summer. The polyurethane resin comprises an alicyclic component and / or an aromatic component and is characterized by having a glass transition temperature of 100 DEG C or above and below 200 DEG C. Preferably, the polyurethane resin is one obtained by polymerizing a diisocyanate having a cyclohexane structure and a diol having a cyclohexane structure, or one obtained by polymerizing a diisocyanate having a phenyl group and a diol having a cyclohexane structure. The phase difference film comprises the polyurethane resin. Further disclosed is an optical film.

Description

technical field [0001] The present invention relates to a polyurethane resin containing an alicyclic component or an aromatic component, and a phase difference film using the polyurethane resin and used for a liquid crystal display device or the like. Background technique [0002] As retardation films used in liquid crystal display devices and the like, polycarbonate films were used in the early stages of development (JP-A-5-113506, etc.). However, polycarbonate has a large photoelastic coefficient, and it is difficult to obtain a film with uniform retardation. [0003] Then, a film in which a phase difference adjusting agent was added to cellulose triacetate appeared (EP0911656 etc.). However, cellulose triacetate has a problem of poor heat resistance. [0004] In order to solve this problem, a film formed of a cycloolefin resin has been used as a highly heat-resistant retardation film (JP-A-4-361230, etc.). However, a film formed of a cycloolefin resin has a problem tha...

Claims

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Application Information

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IPC IPC(8): C08G18/74C08G18/32C08J5/18G02B5/30G02F1/13363
CPCC08G18/755G02B5/3083C08G18/7671C08J2375/04C08J5/18C08G18/758C08G18/3212G02F1/13363
Inventor 龟井修一伊藤由实
Owner TOYO KOHAN CO LTD
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