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Polycarbonate resin and method for producing same

A technology of polycarbonate resin and manufacturing method, which is applied in the field of polycarbonate resin and its manufacturing, can solve problems such as cumbersome operation, and achieve the effect of less mold pollution

Active Publication Date: 2021-03-05
MITSUBISHI GAS CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, the method of Patent Document 2 has the following disadvantages: In order to confirm the time point of adding the terminal terminator, it is necessary to perform measurement using devices such as gel permeation chromatography (GPC) and high-speed liquid chromatography (HPLC) during production, and the operation is cumbersome.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0128] Hereinafter, although an Example demonstrates this invention more concretely, this invention is not limited to the following Example.

[0129]

[0130] The weight-average molecular weight (Mw), molecular weight distribution value (Mw / Mn) (in terms of polystyrene) and oligomers with a molecular weight of less than 1,000 of the polycarbonate resins obtained in Examples and Comparative Examples were measured under the following conditions The content ratio (mass %).

[0131] Machine used: HLC-8320GPC manufactured by Tosoh Corporation

[0132] Chromatographic column: Shodex K-G+K-805Lx2 pieces+K-800D

[0133] Eluent; Chloroform

[0134] Temperature: chromatographic column constant temperature tank 40°C

[0135] Flow rate: 1.0ml / min

[0136] Concentration: 0.1wt / vol%

[0137] Injection volume: 100μl

[0138] Pre-treatment: filter with 0.45μm filter

[0139] Detector: Differential Refractometer (RI)

[0140] In addition, the content rate (mass %) of the oligomer wit...

Embodiment 2

[0153] In the process 2, except having changed emulsification time into 2 minutes, it carried out similarly to Example 1, and obtained the polycarbonate resin powder.

[0154] As a result of GPC analysis and measurement of the obtained polycarbonate resin powder, the Mw was 157,500, the molecular weight distribution value (Mw / Mn) was 4.16, and the content ratio of oligomers with a molecular weight of less than 1,000 was 0.35% by mass.

Embodiment 3

[0156] In the process 1, except having changed TEBAC into tributylbenzyl ammonium chloride (TBBAC), it carried out similarly to Example 1, and obtained the polycarbonate resin powder.

[0157] As a result of GPC analysis and measurement of the obtained polycarbonate resin powder, the Mw was 159,300, the molecular weight distribution value (Mw / Mn) was 4.94, and the content ratio of oligomers with a molecular weight of less than 1,000 was 0.27% by mass.

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Abstract

The purpose of the present invention is to provide: a polycarbonate resin which has a narrow molecular weight distribution and in which the formation of low molecular weight oligomers is suppressed; and a method for producing the polycarbonate resin. According to the present invention, provided are a polycarbonate resin containing a structural unit represented by general formula (1), wherein the molecular weight distribution value (Mw / Mn) is 6.0 or less, and the content of oligomers having a molecular weight of less than 1,000 is suppressed to 0.50 mass% or less; and a method for producing thepolycarbonate. In general formula (1), R1-26 represent hydrogen, fluorine, chlorine, bromine, iodine, a C1-9 alkyl group, a C6-12 aryl group, a C1-5 alkoxy group, a C2-5 alkenyl group, or a C7-17 aralkyl group.

Description

technical field [0001] The present invention relates to a polycarbonate resin having a narrow molecular weight distribution and suppressing the formation of low-molecular-weight oligomers, and a method for producing the same. Background technique [0002] Polycarbonate resins are widely used in the manufacture of various molded products. For example, substrates of optical storage media such as optical disks and magneto-optical disks are mainly produced by injection molding of polycarbonate resin. In order to injection mold such a delicate product, it is required that less volatile polycarbonate-derived oligomers adhere to the stamper or mold. [0003] As a method for producing a polycarbonate resin that suppresses the generation of volatile oligomers, for example, Patent Document 1 discloses a method for producing a polycarbonate resin in which a carbonate raw material is reacted with a dihydroxy compound The obtained polycarbonate oligomer and the oligomer having a viscos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/04C08G64/22
CPCC08G64/04C08G64/24C08G64/226C08G64/06
Inventor 石川骏
Owner MITSUBISHI GAS CHEM CO INC
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