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Polycarbonate resin and optical material comprising the same

A polycarbonate resin and carbon atom technology, applied in the field of polycarbonate resin and optical materials using the resin, can solve problems such as no introduction and the like

Inactive Publication Date: 2009-07-22
MITSUBISHI GAS CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this specification, no description is given on the water swelling of the polycarbonate resin accompanying changes in the ambient humidity.

Method used

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  • Polycarbonate resin and optical material comprising the same
  • Polycarbonate resin and optical material comprising the same
  • Polycarbonate resin and optical material comprising the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] In 52 liters of a 7.9% (w / w) sodium hydroxide aqueous solution, 20 g of bisulphate and 7.00 kg of 2,2-bis(4-hydroxyphenyl)propane (hereinafter abbreviated as BPA) were added and dissolved. 32 liters of dichloromethane was added thereto, stirring was maintained at 15°C, and 3.67 kg of phosgene was blown in at a rate of 0.12 kg / min.

[0105] Dissolve dodecyl-4-hydroxybenzoate (manufactured by API Corporation, trade name: POB-C12, hereinafter referred to as POB-C12) as a terminal terminator in 3 liters of dichloromethane kept at 35°C. 620g of the solution was added to the above-mentioned solution after the blowing of phosgene was terminated, stirred vigorously for 10 minutes, then added 12ml of triethylamine, and stirred for about 1 hour to polymerize.

[0106] Add 10 liters of dichloromethane to the polymerization liquid, stir for 5 minutes, separate the water phase and the organic phase, neutralize the organic phase with phosphoric acid, and wash repeatedly to make the c...

Embodiment 2

[0114] Except that the 579g terminal terminator POB-C12 used was changed to stearoyl-4-hydroxybenzoate (manufactured by API Corporation, trade name: POB-C18, hereinafter referred to as POB-C18) 790g, and the implementation Example 1 is also operated.

[0115] The intrinsic viscosity [η] of the obtained polymer was 0.35 dl / g, and the polymer was analyzed by infrared absorption spectroscopic analysis, and it was confirmed that it had a polycarbonate polymer structure equivalent to that of Example 1 except for the terminal structure. As in Example 1, the evaluation results are shown in Table 1.

[0116] It can be seen from Table 1 that for the polycarbonate described in Example 1 and Example 2, at a temperature of 25° C. and a relative humidity of 80% RH to 45% RH, the rate of change of the coefficient of water expansion is below 3.5 ppm / % RH. The rate of change in the water expansion rate due to changes in humidity is small.

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PUM

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Abstract

A polycarbonate resin which is reduced in the change of hygroscopic-expansion coefficient with changing environmental humidity, is inhibited from warping, and is suitable for use as an optical material is provided with excellent productivity. The polycarbonate resin is obtained by reacting an aromatic dihydric phenol compound (2,2-bis(4-hydroxyphenyl)propane, etc.), a compound forming a carbonic ester (phosgene, etc.), and a chain terminator represented by the following general formula (A) (dodecyl 4-hydroxybenzoate, etc.). In the formula (A), n is an integer of 10-20.

Description

technical field [0001] The present invention relates to a polycarbonate resin suitable for manufacturing optical disc substrates such as CD, LD, MO disc, DVD, Blu-Ray disc (Blu-Ray Disc), etc., and particularly relates to a polycarbonate resin having a small change rate of water absorption expansion rate due to changes in ambient humidity. Background technique [0002] In the past, the disc substrate material was preferably polycarbonate resin (hereinafter sometimes referred to as PC), polymethyl methacrylate (PMMA), cyclic polyolefin, etc., but in terms of dimensional stability, impact strength, heat resistance, etc. , Cost considerations, it can be said that PC is the most comprehensive and balanced material. Among PCs, especially bisphenol A PC, due to its high cost performance, it is the most popular material as an optical disc material. However, in recent years, along with the increase in the density of optical discs, the performance required for the optical disc subst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/14G11B7/24G11B7/253G11B7/24079G11B7/24085G11B7/2534
CPCG11B7/24C08G64/14G11B7/2534C08G64/40C08L69/00
Inventor 金川达也安藤和弘
Owner MITSUBISHI GAS CHEM CO INC
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