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Production method for polycarbonate

A polycarbonate and halogenated hydrocarbon technology, applied in the field of polycarbonate preparation, can solve the problems of expensive, unsuitable for mass production, etc.

Active Publication Date: 2021-07-23
KOBE UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, phosgene and carbon monoxide do not need to be used, but an expensive catalyst must be used, and carbon dioxide must be subjected to high pressure, etc., which is not suitable for industrial mass production.

Method used

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  • Production method for polycarbonate
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  • Production method for polycarbonate

Examples

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Effect test

preparation example Construction

[0069] In the preparation method of polycarbonate of the present invention, in the presence of oxygen to contain C 1-4 A composition of a halogenated hydrocarbon, a diol compound, and a specific base is irradiated with light.

[0070] 1.C 1-4 Halogenated hydrocarbon

[0071] In the reaction of the present invention, it is considered that C 1-4 Halogenated hydrocarbons may be decomposed by irradiation of light and oxygen, converted into carbonyl halides or compounds similar to carbonyl halides, and react with diol compounds to form polycarbonates. Even if harmful carbonyl halides are generated, the carbonyl halides immediately react with the diol compound due to their extremely high reactivity, and do not leak out of the reaction solution, or even if they leak, the amount of leakage is small. For example, phosgene as a carbonyl halide has very high toxicity and imposes severe restrictions on its transport, etc., but C 1-4 Halogenated hydrocarbons are certainly not terribly ...

Embodiment 1

[0198] Embodiment 1: the synthesis of BisP-CDE polycarbonate

[0199] [chemical formula 16]

[0200]

[0201] A quartz glass sleeve with a diameter of 30 mm is placed in a cylindrical reaction vessel with a diameter of 42 mm and a capacity of 100 mL, and then a low-pressure mercury lamp (“UVL20PH-6” produced by SEN Light Company, 20 W, ), build a reaction system. figure 1 A schematic diagram of the reaction system is shown. In addition, the irradiation light from this low-pressure mercury lamp contains UV-C with a wavelength of 254 nm, and the illuminance of the light with a wavelength of 254 nm at a position 5 mm from the tube wall is 6.23 to 9.07 mW / cm 2 . Refined chloroform (20mL), 4,4'-cyclododecylphenylene bisphenol (BisP-CDE, produced by Honshu Chemical Industry Co., Ltd.) (3.52g, 10mmol), 5 times the molar ratio of BisP-CDE Pyridine (4.04 mL) was added to the reaction vessel and stirred to mix. While stirring the reaction solution, 1 L / min of oxygen gas was bub...

Embodiment 2

[0212] Embodiment 2: the synthesis of BisP-CDE polycarbonate

[0213] In the reaction vessel of the reaction system used in Example 1, purified chloroform (20 mL), BisP-CDE (3.52 g, 10 mmol) and aqueous sodium hydroxide solution (NaOH: 8 g, 50 mL, 200 mmol) were added, and stirred and mixed. While stirring the reaction liquid, 1 L / min of oxygen gas was bubbled in at 20° C., and the above-mentioned low-pressure mercury lamp was irradiated for 1 hour.

[0214] Dichloromethane was added to the reaction solution for liquid separation, and the organic phase was dehydrated with anhydrous sodium sulfate, followed by concentration to obtain a brown oil (amount: 5.87 g, yield: >100%). As a result of analyzing the obtained solid by 1H NMR, it was confirmed that the target compound was produced although dichloromethane was mixed. In addition, the yield exceeding 100% was due to the residue of the solvent.

[0215] The molecular weight of the obtained BisP-CDE polycarbonate was determin...

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Abstract

The purpose of the present invention is to provide a method for safely and efficiently producing a polycarbonate. This production method for a polycarbonate is characterized by including a step for irradiating a composition that includes a C1-4 halohydrocarbon, a specific diol compound, and a specific base with light in the presence of oxygen.

Description

technical field [0001] The present invention relates to a safe and efficient process for the preparation of polycarbonates. Background technique [0002] Among carbonate derivatives, polycarbonate, which is a condensate of carbonic acid and a bisphenol compound, is widely used as an engineering plastic excellent in transparency and impact resistance. [0003] Carbonate derivatives are usually prepared from phosgene and compounds containing nucleophilic functional groups. However, phosgene reacts easily with water to form hydrogen chloride and has a history of being used as a poisonous gas, making it very toxic. In addition, there is a production method of reacting carbon monoxide, alcohol, and oxygen, but there is a problem that toxic carbon monoxide must be used under high pressure. Therefore, various safe preparation methods of carbonates and polycarbonates have been studied. [0004] For example, Patent Document 1 describes a method for producing a target carbonate der...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/38
CPCC08G64/38C08G64/06C08G64/0208C08G64/1608C08G64/24C08G64/183C08G64/226
Inventor 津田明彦
Owner KOBE UNIV
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