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Thermoplastic resin composition, optical film and oriented film

A technology of thermoplastic resin and composition, which is applied in the direction of polarizing elements, can solve the problems of difficult cost reduction of polymers, poor phase difference performance, poor phase difference stability, and complicated manufacturing process, etc., to achieve good phase difference performance, Low birefringence and excellent heat resistance

Inactive Publication Date: 2007-12-12
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a transmissive liquid crystal display in which two polarizers are used in a crossed polarization state (a state in which the transmission axes of the polarizers are perpendicular to each other), if the viewing position of the display is changed to a direction oblique from the front of the display, due to the The light transmission axis of the two polarizers deviates from 90 degrees, resulting in light leakage and color spots (coloring) in the dark state
However, most of the norbornene-based ring-opening polymers studied in the past have very small wavelength dispersion of birefringence in the 400-800nm ​​region and show that the longer the wavelength, the smaller the retardation (Re 400 > Re 550 > Re 800 ) dispersion
In contrast, attempts have been made to introduce substituted aromatic groups into the side chains of cycloolefin-based ring-opening polymers to control the absolute value of birefringence and wavelength dispersion, although some such measures are disclosed (see Patent Documents 1 to 3), However, since such a polymer needs to be re-synthesized from a norbornene-based monomer with a special structure as a precursor, the production process becomes complicated, and there is a problem that it is difficult to reduce the cost of the polymer, so it has not been put into practical use.
[0009] In addition, there is disclosed a thermoplastic resin composition in which in order to obtain a special wavelength dispersibility (Re 400 550 800 ), a thermoplastic resin composition obtained by mixing a known cycloolefin-based ring-opening polymer and polystyrene in the presence of a compatibilizing agent (Patent Document 4), however, if a phase difference film containing a compatibilizing agent is used If the resin composition is used, the compatibilizer acts as an orientation easing agent for the resin, and there is a problem that the retardation performance and the retardation stability are deteriorated.
Furthermore, as a hybrid system that does not require a compatibilizing agent, Patent Document 5 discloses a resin composition containing a known cycloolefin-based ring-opening polymer and a polar group-containing polystyrene resin, and Patent Document 6 discloses Resin composition containing maleic anhydride-styrene copolymer, however, the former may cause coloring (yellowing) of the mixture to be a problem, and the latter, due to the high reactivity of the maleic anhydride unit, is based on moisture in the atmosphere, etc. , it may be modified by carboxylic acid during use, and it is worried about insufficient reliability when used as an optical film

Method used

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  • Thermoplastic resin composition, optical film and oriented film
  • Thermoplastic resin composition, optical film and oriented film
  • Thermoplastic resin composition, optical film and oriented film

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0315] Cyclic olefin polymer (1) and styrene / 2-hydroxyethyl methacrylate copolymer (1) in the form of cycloolefin polymer (1): styrene / 2-hydroxyethyl methacrylate copolymer (1) The compounding ratio (weight ratio) of =65:35 was dissolved in toluene, and adjusted to a solution with a concentration of 30% by weight, then, a film was formed by solution casting, and vacuum-dried at 100° C. for 72 hours to obtain a transparent film with a film thickness of 135 μm (HAZE value = 1.1). As a result of performing differential scanning calorimetry (DSC measurement), the transparent film showed a single Tg=106°C. From these results, it was confirmed that the cycloolefin polymer (1) was completely compatible with the styrene / 2-hydroxyethyl methacrylate copolymer (1).

[0316] Cut the above-mentioned transparent film into 10mm×80mm, use the Instron tensile testing machine (5567 type) with a constant temperature bath, with a stretching temperature of 121°C (Tg+15°C), a stretching speed of 6...

Embodiment 2

[0318] Cyclic olefin polymer (1) and styrene / 2-hydroxyethyl methacrylate copolymer (2) in the form of cycloolefin polymer (1): styrene / 2-hydroxyethyl methacrylate copolymer (2) The compounding ratio (weight ratio) of =65:35 was dissolved in toluene, and adjusted to a solution with a concentration of 30% by weight, then, a film was formed by solution casting, and vacuum-dried at 100° C. for 72 hours to obtain a transparent film with a film thickness of 112 μm (HAZE value = 0.5). As a result of performing differential scanning calorimetry (DSC measurement), this transparent film showed a single Tg=105 degreeC. From these results, it was confirmed that the cycloolefin polymer (1) was completely compatible with the styrene / 2-hydroxyethyl methacrylate copolymer (2).

[0319] Cut the above-mentioned transparent film into 10mm×80mm, use the Instron tensile testing machine (5567 type) with a constant temperature bath, with a stretching temperature of 120°C (Tg+15°C), a stretching spe...

Embodiment 3

[0321] Cyclic olefin polymer (1) and styrene / 2-hydroxyethyl methacrylate copolymer (3) in the form of cycloolefin polymer (1): styrene / 2-hydroxyethyl methacrylate copolymer (3) The compounding ratio (weight ratio) of =65:35 was dissolved in toluene, and adjusted to a solution with a concentration of 30% by weight, then, a film was formed by solution casting, and vacuum-dried at 100° C. for 72 hours to obtain a transparent film with a film thickness of 147 μm (HAZE value = 7.0). As a result of performing differential scanning calorimetry (DSC measurement), this transparent film showed a single Tg=105 degreeC. From these results, it was confirmed that the cycloolefin polymer (1) was completely compatible with the styrene / 2-hydroxyethyl methacrylate copolymer (3).

[0322] Cut the above-mentioned transparent film into 10mm×80mm, use the Instron tensile testing machine (5567 type) with a constant temperature bath, with a stretching temperature of 120°C (Tg+15°C), a stretching spe...

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Abstract

A thermoplastic resin composition that while retaining low birefringence, exhibits high compatibility and excels in antiweatherability and heat resistance; and an optical film produced therefrom; and a retardation film that excels in antiweatherability and heat resistance and exhibits a reverse wavelength dispersion. The thermoplastic resin composition comprises cycloolefin polymer (B) and vinyl polymer (A) having units of the general formula: (I) wherein each of R<1> to R<3> is a hydrogen atom; a halogen atom; a substituted or unsubstituted C1-C30 hydrocarbon group which may have a linkage group containing an oxygen atom, sulfur atom, nitrogen atom or silicon atom; or a polar group, and n is 0 or a positive integer.

Description

technical field [0001] The present invention relates to a thermoplastic resin composition containing a vinyl polymer having an aliphatic hydroxyl group in a side chain and a cyclic olefin polymer, and an optical film thereof. Moreover, this invention relates to the stretched film (retardation film) obtained by stretch-orientating the said optical film. [0002] In addition, in this specification, the term "birefringence" is used in a general sense. And, the value of so-called birefringence (take it as Δn) is a value obtained by uniaxially stretching a film obtained from a thermoplastic resin composition, orienting polymer molecular chains in one direction, and stretching the obtained stretched film with a tensile strength. The stretching direction is the x-axis, the opposite in-plane vertical direction is the y-axis, and the refractive index in the x-axis direction is n x , the refractive index in the y-axis direction n y When by the following formula: Δn = n x -n y It is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/14C08L65/00C08L25/00G02B5/30C08L45/00
CPCC08L33/14C08L25/14C08L45/00C08L65/00C08L2666/04C08L2666/06C08L25/00G02B5/30
Inventor 宫本佳和宫木伸行川岛直之梶原一郎
Owner JSR CORPORATIOON