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Polycarbonate resin and method for producing the same

A technology of polycarbonate resin and manufacturing method, applied in the field of optical materials, capable of solving problems such as inability to obtain satisfactory molded products, coloring, insufficient formability and heat resistance, etc.

Active Publication Date: 2010-03-24
MITSUBISHI GAS CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] As mentioned above, various low-birefringence materials have been developed, but these technologies have problems such as low refractive index, insufficient formability and heat resistance, and unsatisfactory molding or coloring.

Method used

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  • Polycarbonate resin and method for producing the same
  • Polycarbonate resin and method for producing the same
  • Polycarbonate resin and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0171] The present invention will be described below through examples, but the present invention is not limited by these examples. In addition, the measured value in an Example was measured using the following method or apparatus.

[0172] 1) Intrinsic viscosity (limiting viscosity): Ubbelohde viscosity tube is used. Measurement was performed at 20° C., 0.5% dichloromethane solution, and a Huggins constant of 0.45.

[0173] 2) Glass transition temperature (Tg): measured by a differential scanning calorimeter (DSC).

[0174] 3) Photoelastic coefficient: Calculated by ellipsometry, using a cast film with a thickness of 100 μm, irradiating light with a laser wavelength of 633 nm, and measuring birefringence with respect to load changes.

[0175] 4) Film strength and elongation: Based on ASTM D882-61T, the tensile strength and tensile elongation of the 100-micrometer-thick film obtained in the Example were measured using Shimadzu Autograph AGS-100G.

[0176] 5) Total light tran...

Synthetic example 1

[0180] Add 308g of acenaphthene, 3250mL of acetic acid, 30.6g of cobalt(II) bromide hexahydrate, 6.1g of cobalt(II) acetate tetrahydrate, and 1.5g of manganese(II) acetate tetrahydrate into a 10L three-necked flask, stir and mix , after completely dissolving it, air was blown into the solution at 20° C. under normal pressure at 400 L / h. After 4.3 hours, the reaction was stopped, and the reaction product was analyzed by a gas chromatograph. As a result, the conversion of acenaphthene was 99.2%, and the yield of acenaphth-1-one was 28.1%.

Synthetic example 2

[0182] 1 L of toluene and 2 L of water were added to 1 kg of the reaction product liquid obtained in Synthesis Example 1, stirred for 5 minutes and extracted, then left to stand for 15 to 20 minutes, separated, and the upper toluene layer was recovered. Put 4% aqueous sodium hydroxide solution equivalent to the above extract into a separatory funnel, shake and let it stand, and remove the black liquid in the lower layer. The same amount of water as the remaining solution was added and washed to remove the lower layer liquid. Further, water was added, 2 mL of hydrochloric acid was added, and the mixture was shaken to remove the liquid in the lower layer, followed by washing with water again. The oil layer was further washed with alkali, concentrated, and the solvent was removed. The concentrated solution was distilled at a pressure of 1 to 2 mmHg, and 16 g of acenaphth-1-one was distilled at a distillation temperature of 120°C.

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Abstract

The present invention can provide a polycarbonate resin containing a structural unit represented by the following formula (1). In the formula (1), R represents one selected from an alkyl group having1 to 9 carbon atoms, an aryl group having 6 to 12 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an aralkyl group having 7 to 17 carbon atoms, and halogen; and n represents the number of substituting R's on a benzene ring and is an integer of 0 to 4. Y represents an alkylene group having 1 to 4 carbon atoms; and p is an integer of 0 to 4.

Description

Technical field [0001] The present invention relates to a novel polycarbonate resin, and a particularly preferred embodiment of the invention relates to a novel polycarbonate having transparency, heat resistance, high refractive index, low photoelastic coefficient, low birefringence, and high mechanical strength. Resins and optical materials using them. The polycarbonate resin of the present invention can be suitably used as plastic optical products such as various optical lenses, prisms, optical disc substrates, optical fibers, optical communication equipment, and optical materials for optical films. Background technique [0002] In recent years, with the advancement of optoelectronics, there has been an increasing demand for isotropic optically transparent polymers with excellent optical properties. In particular, an optical film having optical properties suitable for use as a retardation film of a liquid crystal display or the like is desired. [0003] Polycarbonate res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/16
CPCC08G64/1608C08G64/0208C08G64/06Y10T428/31507Y10T428/31504C08G64/16C08G64/20C08J5/18G02B5/30
Inventor 吉田周山田敏明
Owner MITSUBISHI GAS CHEM CO INC
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