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Polycarbonate resin, and polycarbonate resin composition

Inactive Publication Date: 2017-01-12
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a polycarbonate resin and a composition that can create a molded body with a desirable hue (lower YI value).

Problems solved by technology

Accordingly, there occurs a phenomenon in which a difference in color tone between a portion close to a light source and a portion distant therefrom is observed, and there occurs a problem in that the color tone becomes nonuniform.
In the application, however, required quality in terms of a color tone is not as high as that in a light-guiding member because a required light transmission length is as short as the thickness direction of the disc (about 0.6 mm).

Method used

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  • Polycarbonate resin, and polycarbonate resin composition
  • Polycarbonate resin, and polycarbonate resin composition
  • Polycarbonate resin, and polycarbonate resin composition

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0073]An obtained bisphenol A (initial IPP concentration: 5 ppm by mass, initial 2,4-isomer concentration: 102 ppm by mass) was heated under the following conditions. That is, 10 g of the bisphenol A was loaded into a colorimetric tube having a diameter of 30 mm to be used in the measurement of an APHA or the like, and was heated in an electric furnace at 175° C. After the heating for 1 hour, the colorimetric tube was removed from the electric furnace and cooled. After that, the solidified bisphenol A was removed and subjected to impurity analysis. The bisphenol A was analyzed for the concentration of isopropenylphenol (hereinafter sometimes abbreviated as “IPP”) and the concentration of the 2,4-isomer by high performance liquid chromatography. A high performance liquid chromatograph (manufactured by Waters, model: 2695, column: manufactured by GL Sciences Inc., Inertsil (trademark) ODS-3V) was used in the analysis including the analysis of the initial concentration. The mobile phas...

example 2

[0082]A bisphenol A having an initial IPP concentration of 6 ppm by mass and an initial 2,4-isomer concentration of 204 ppm by mass was subjected to a heating test in the same manner as in Example 1. Its IPP concentration and 2,4-isomer concentration after the heating test were 32 ppm by mass and 206 ppm by mass, respectively. The results are shown in Table 1-1.

[0083]100 Parts by mass of (A) a polycarbonate resin produced by using a bisphenol A of the same lot as that of the bisphenol A as a raw material in the same manner as in Example 1 was dry-blended with (B-1) the phosphorus-based antioxidant and (C) the polyorganosiloxane having a functional group at ratios shown in Table 2-1, and then a polycarbonate resin composition was prepared in the same manner as in Example 1. Molded bodies were produced from the composition, and their YI values were measured. The results are shown in Table 2-1.

example 3

[0084]A bisphenol A having an initial IPP concentration of 4 ppm by mass and an initial 2,4-isomer concentration of 56 ppm by mass was subjected to a heating test in the same manner as in Example 1. Its IPP concentration and 2,4-isomer concentration after the heating test were 39 ppm by mass and 56 ppm by mass, respectively. The results are shown in Table 1-1.

[0085]100 Parts by mass of (A) a polycarbonate resin produced by using a bisphenol A of the same lot as that of the bisphenol A as a raw material in the same manner as in Example 1 was dry-blended with (B-1) the phosphorus-based antioxidant and (C) the polyorganosiloxane having a functional group at ratios shown in Table 2-1, and then a polycarbonate resin composition was prepared in the same manner as in Example 1. Molded bodies were produced from the composition, and their YI values were measured. The results are shown in Table 2-1.

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Abstract

Provided is a polycarbonate resin, including, as a raw material, a bisphenol A having 100 ppm by mass or less of isopropenylphenol and 250 ppm by mass or less of 2-(2-hydroxyphenyl)-2-(4-hydroxyphenyl)propane, each detected after heating in air at 175° C. for 1 hour.

Description

TECHNICAL FIELD[0001]The present invention relates to a polycarbonate resin and a polycarbonate resin composition, which are available by selecting and using a specific raw material, and have a satisfactory hue. More specifically, the present invention relates to a polycarbonate resin and a polycarbonate resin composition each having a reduced yellow tint (low YI value) and an excellent light transmission property.BACKGROUND ART[0002]A polycarbonate resin (hereinafter sometimes abbreviated as “PC resin”) is excellent in, for example, transparency, mechanical characteristics, thermal stability, electrical properties, and weatherability, and hence has been used in an optical molded article, such as a light-guiding plate, a lens, or an optical disc, by taking advantage of such characteristics. However, the light transmission property of the resin is lower than that of a polymethyl methacrylate (PMMA) or the like, and hence its color tone has a slightly yellow tint.[0003]Particularly in...

Claims

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Application Information

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IPC IPC(8): C08G64/06C08L69/00C07C39/16C08K5/524
CPCC08G64/06C07C39/16C08L69/00C08K5/524C08L83/04C08G77/14C08G77/20C08G77/26C08G77/28C08L83/06C08L83/08C08K5/005C08G77/18B29D11/00663
Inventor WATANABE, NOBUHIRO
Owner IDEMITSU KOSAN CO LTD
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