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Optical forming body

A technology of optical molded body and main body, applied in the direction of polarizing elements, etc., which can solve the problems of excellent optical characteristics and no records, etc., and achieve the effects of small birefringence, small retardation, and excellent transparency

Active Publication Date: 2012-07-11
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no description at all that the optical properties of sheets and films obtained from these compositions are excellent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0063] Next, the present invention will be illustrated by way of examples.

[0064] First, the evaluation methods used in the invention and examples of the present application will be described.

[0065] (A) Evaluation

[0066] (1) Determination of delay

[0067] The wavelength of 400-800 nm was measured by the rotating analyzer method using RETS-100 manufactured by Otsuka Electronics. However, the evaluation was performed using the measured value at 550 nm. The absolute value of birefringence (|Δn|) and retardation (Re) satisfy the following relationship.

[0068] Re=|Δn|×d

[0069] (|Δn|: absolute value of birefringence, Re: retardation, d: thickness of sample (nm))

[0070] In addition, the absolute value (|Δn|) of birefringence is the value shown below.

[0071] |Δn|=|nx-ny|

[0072] (nx: Refractive index in the stretching direction, ny: Refractive index in the direction perpendicular to the stretching direction in the plane)

[0073] (2) Block ratio, and the numbe...

Embodiment 8 and comparative example 11～14

[0110] The sheets with a thickness of 1000 μm used in Reference Example 2 and Comparative Examples 6 to 9 were molded into a cup shape with a thick portion of about 1000 μm and a thin portion of about 250 μm using a vacuum forming machine. The thin-walled part was cut out, fixed in a flat shape, and then the retardation was measured. In addition, hold the broken cup to judge the degree of difficulty of breaking.

[0111] The results are shown in Table 3.

Embodiment 9 and comparative example 15～18

[0113] Using an injection molding machine (FE-120) produced by Nissei Plastic Industry Co., Ltd., the raw materials used in Reference Example 2 and Comparative Examples 6 to 9 were injection molded into a business card board-sized flat plate with a thickness of 1 / 8 inch and a thickness of 2 mm. The retardation (550nm) of the dumbbell and the DuPont impact test of the business card board were performed. The results are shown in Table 4.

[0114] Table 1

[0115] Copolymer (1-a~1-e)

[0116] unit 1-a 1-b 1-c 1-d 1-e Styrene content quality% 77.5 77 70 42 33 Styrene block rate ％ 80 94 80 52 100 The number average molecular weight of the copolymer Ten thousand 8.5 10 11 12 7.0 Number average molecular weight Mn of styrene block Ten thousand 2.0 3.5 3.5 1.2 1.5 The melt flow rate g / 10 minutes 7 10 6 5 13

[0117]

[0118]

[0119] t...

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Abstract

The invention provides a formed optical forming body with small double refraction and excellent transparency and impact endurance test resistance. The optical forming body comprises styrol resin composite containing at least one segmented copolymer (1), and the segmented copolymer (1) comprises a polymer segment A using at least one ethylene aromatic hydrocarbon as the main body and a polymer segment B using at least one conjugated diolefine, wherein the content of the ethylene aromatic hydrocarbon is 40-99 percent.

Description

technical field [0001] The present invention relates to an optical molded article having excellent optical characteristics obtained from a sheet having low birefringence. Background technique [0002] In recent years, with the advancement of optical technology, new optical mechanical products in many fields such as displays, optical discs, laser printers, and optical fibers have been developed. Transparent plastics with excellent optical properties have been widely used in optical products such as optical lenses, prisms, and optical discs. [0003] Generally, polymers have birefringence due to the difference in refractive index in the direction of the main chain of the molecule and in the direction perpendicular to it, resulting in birefringence due to the orientation of the molecular chain. PMMA (Non-Patent Document 1) is known as a transparent material with low birefringence, but since impact resistance is low, a material with low birefringence and good impact resistance i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L53/02C08L25/14C08J5/00G02B5/30
Inventor 松田孝昭石原收
Owner ASAHI KASEI KK