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Retardation film, process for production thereof and polarizer

A technology of retardation film and polarizer, which can be used in polarizing elements, flat products, other household appliances, etc., and can solve the problem of limited combination of protective films.

Active Publication Date: 2011-05-04
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in Patent Document 8, etc., a polarizing plate having reduced warping after bonding a protective film is described. The warping is a problem in manufacture and mounting to a liquid crystal display element, but the protective films on both sides of the polarizing film Combinations are limited, requiring further improvement

Method used

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  • Retardation film, process for production thereof and polarizer
  • Retardation film, process for production thereof and polarizer
  • Retardation film, process for production thereof and polarizer

Examples

Experimental program
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Embodiment

[0204] Hereinafter, specific examples of the present invention will be described, but the present invention is not limited to these examples. In addition, unless otherwise specified, "part" and "%" mean "part by weight" and "% by weight" below.

[0205] In addition, each evaluation item in the following Examples was measured by the following method.

[0206]

[0207] Using a differential scanning calorimeter (DSC) manufactured by SEIKO INSTRUMENTS, the measurement was performed at a heating rate of 20° C. / min in a nitrogen atmosphere, and the differential scanning calorimetry obtained in this way was plotted on the differential scanning calorimetry curve. The maximum peak temperature (point A) and the temperature obtained by subtracting 20°C from the maximum peak temperature (point B) were obtained by taking the intersection point of the tangent line on the baseline starting from point B and the tangent line starting from point A as Tg.

[0208]

[0209] According to ASTM...

Synthetic example 1

[0221] 8-Methyl-8-methoxycarbonyltetracyclo[4.4.0.1 2，5 .1 7，10 250 parts of ]-3-dodecene (specific monomer), 18 parts of 1-hexene (molecular weight regulator), and 750 parts of toluene (solvent for ring-opening polymerization reaction) were charged into a nitrogen-substituted reaction vessel, The solution was heated to 60°C. Next, 0.62 parts of a toluene solution (1.5 mol / liter) of triethylaluminum as a polymerization catalyst, and tungsten hexachloride modified with tert-butanol and methanol (tert-butanol:methanol) were added to the solution in the reaction vessel. : Tungsten = 0.35mol: 0.3mol: 1mol) 3.7 parts of toluene solution (concentration: 0.05 mol / liter), the solution was heated and stirred for 3 hours at 80°C, thereby making it undergo ring-opening polymerization reaction, and obtaining ring polymer solution. The polymerization conversion rate in this polymerization reaction was 97%.

[0222] 1000 parts of the ring-opening polymer solution thus obtained are packe...

Synthetic example 2

[0225] Using 8-methyl-8-methoxycarbonyltetracyclo[4.4.0.1 2，5 .1 7，10 215 parts of ]-3-dodecene and 35 parts of bicyclo[2.2.1]hept-2-ene, except that the addition amount of 1-hexene was 30 parts, and a hydrogenated polymer was obtained in the same manner as in Synthesis Example 1 (hereinafter referred to as "resin B").

[0226] Resin B thus obtained was passed through 1 The hydrogenation rate measured by H-NMR is 99.9%, the Tg measured by the DSC method is 125° C., the Mn measured by the GPC method based on polystyrene conversion is 46,000, the Mw is 190,000, and the Mw / Mn is 4.15. At 23° C. The saturated water absorption is 0.18%, and the logarithmic viscosity in chloroform at 30°C is 0.53dl / g.

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Abstract

The invention aims at providing a retardation film which exhibits an NZ near 1 and which little warps after it has been laminated with a polarizer; a process for the production thereof; and a polarizer made by using the film. The retardation film is made from a cyclic olefin polymer and satisfies the following requirements (1) to (5): (1) 70nm <= Re <= 300nm, (2) 1.1<= NZ <= 1.7, (3) Alpha(MD) <=90ppm / DEG C, (4) Alpha(TD) <= 90ppm / DEG C, and (5) |Alpha(MD) - Alpha(TD)| <= 30ppm / DEG C.

Description

technical field [0001] The present invention relates to a retardation film formed of a cyclic olefin-based polymer, a method for producing the retardation film, and a polarizing plate using the retardation film. Background technique [0002] Cyclic olefin-based resins have characteristics such as high glass transition temperature due to the rigidity of the main chain structure, amorphousness and high light transmittance due to the presence of bulky groups in the main chain structure, and Since the anisotropy of the refractive index is small, it exhibits low birefringence, and has attracted attention as a transparent thermoplastic resin excellent in heat resistance, transparency, and optical properties. [0003] In recent years, studies have been conducted on applications of the above-mentioned cyclic olefin-based resins to optical materials such as optical discs, optical lenses, and optical fibers, and sealing materials such as optical semiconductor seals. Moreover, it was ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30B29C55/08C08J5/18G02F1/13363B29L11/00B29L7/00B29K45/00
CPCB29C55/08B29K2023/38B29K2995/0032C08J5/18C08J2345/00C08J2365/00G02B5/3083G02F2413/15G02B5/30G02F1/13363
Inventor 田中圭牛野卓浩桑原和雄关口正之
Owner JSR CORPORATIOON