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Cycloolefin copolymer obtained by ring-opening polymerization, use thereof, and process for producing phase retardation plate comprising the copolymer

A technology of cyclic olefins and copolymers, applied in the direction of polarizing elements, etc., can solve the problems of decreased uniformity of phase difference, inability to meet the required characteristics, and reduce the occurrence rate of phase difference, etc., to achieve good heat resistance and optical properties, uniform Effect of no optical axis vibration and uniform phase difference

Inactive Publication Date: 2007-05-09
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, when using self-polymers, the properties of the resulting polymer are basically determined by the properties of the cyclic olefin-based monomer used, so it cannot meet all and various required properties.
[0007] On the other hand, when using a copolymer, when stretching near the glass transition temperature (hereinafter also referred to as Tg) of the copolymer, there are serious problems such as white staining of the stretched film and a decrease in the uniformity of phase difference.
Although these problems can be overcome by stretching the film at a higher temperature, stretching at a high temperature will reduce the incidence of retardation, so the elongation rate required to obtain the desired retardation value increases, or the film needs to be thickened thickness, etc., there is a problem of phase difference control

Method used

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  • Cycloolefin copolymer obtained by ring-opening polymerization, use thereof, and process for producing phase retardation plate comprising the copolymer
  • Cycloolefin copolymer obtained by ring-opening polymerization, use thereof, and process for producing phase retardation plate comprising the copolymer
  • Cycloolefin copolymer obtained by ring-opening polymerization, use thereof, and process for producing phase retardation plate comprising the copolymer

Examples

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Embodiment 1

[0238] [chemical formula 5]

[0239]

[0240] The represented 8-methyl-8-methoxycarbonyltetracyclo[4.4.0.1 2，5 .1 7，10 70 parts of ]-3-dodecene (DNM), 20 parts of dicyclopentadiene (DCP), 7 parts of 1-hexene and 200 parts of toluene of molecular weight regulator, join in the reaction container that has replaced nitrogen, in Heating at 100°C, then adding 0.005 part of triethylaluminum, denatured WCl with methanol 6 (anhydrous methanol: PhPOCl 2 : WCl 6 =103:630:427 weight ratio) 0.005 part, reacted for 1 minute, added 10 parts of DCP over 5 minutes, and reacted for 45 minutes to obtain a polymer.

[0241] The obtained polymer solution was placed in an autoclave, and 200 parts of toluene was added thereto. Then, add 1 part of octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl) propionate and 0.006 parts of hydrogenation catalyst RuHCl(CO) as a reaction regulator [ P(C 6 h 5 )] 3 , after heating to 155°C, put hydrogen into the reactor with a pressure of 10MPa. Thereafter, t...

Embodiment 2

[0247] In Example 1, except that DCP is not used, all 86 parts of DNM can be added to the reaction vessel, and polymerization is started, and 14 parts of norbornene (NB) are gradually added in 20 minutes after the start of polymerization. Example 1 is the same, and further obtain the copolymer (2).

[0248] Copolymer (2) is weight average molecular weight (Mw)=9.3 * 10 4 , molecular weight distribution (Mw / Mn)=3.0, intrinsic viscosity (η inh )=0.62, glass transition temperature (Tg)=120°C. In addition, the Tg distribution is 30°C. Fig. 2 is a DSC measurement spectrum. Also, through 1 As a result of measuring the hydrogenation rate of the copolymer (2) by H-NMR measurement, 99.9% or more of the olefinic unsaturated bonds were hydrogenated.

[0249] As in Example 1, a cast film (2) having a thickness of 130 µm was produced. The resulting cast film (2) had a residual solvent content of 0.5% or less. Thereafter, stretching was performed 2.0 times at Tg+5°C of the copolymer ...

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Abstract

A cycloolefin copolymer obtained by ring-opening polymerization characterized in that it has a specific structural unit and gives in differential scanning calorimetry a DSC curve which has a single peak and in which the temperature width of the rising part of the peak is 35 DEG C or smaller, and that the copolymer has a glass transition temperature (Tg) of 110 DEG C or higher. The cycloolefin copolymer is excellent in heat resistance and optical properties and is suitable for forming a film or sheet therefrom. It can be stretched even at a relatively low temperature around the Tg without arousing troubles such as turbidity. Also provided are: a film or sheet which comprises the cycloolefin copolymer and is excellent in optical properties and heat resistance and suitable for stretching at a relatively low temperature; a retardation plate excellent in optical properties and heat resistance and having even retardation; and a process for producing the retardation plate.

Description

technical field [0001] The present invention relates to a cyclic olefin-based ring-opened copolymer that can be stretched at a relatively low temperature without causing problems such as white stains. The present invention also relates to films, sheets and phase retardation plates containing such cyclic olefin ring-opening copolymers, and a method for producing the phase retardation plate. Background technique [0002] Cyclic olefin-based ring-opening (co)polymers have a high glass transition temperature due to the rigidity of the main chain structure, and are amorphous and have high light transmittance due to the presence of high volume groups in the main chain structure. Due to advantages such as small anisotropy of refraction and low birefringence, it is attracting attention as a transparent thermoplastic resin having good heat resistance, transparency, and optical properties. Such cyclic olefin-based ring-opening (co)polymers include those described in Patent Documents ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G61/08B29C55/02G02B5/30B29C55/06C08G61/06
CPCC08G61/06B29C55/06B29K2023/38C08G61/08G02B5/30
Inventor 冈庭求树梶原一郎诹访好丸山洋一郎桥口裕一
Owner JSR CORPORATIOON
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