Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Process for production of aromatic polycarbonate resin

A polycarbonate resin, aromatic technology, applied in the field of preparation of aromatic polycarbonate resin, to achieve the effect of excellent color

Active Publication Date: 2012-05-23
MITSUBISHI RAYON CO LTD
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] According to the above method, it is possible to properly determine the timing of the cleaning operation of the gas phase part of the reactor, thereby effectively producing an aromatic polycarbonate resin with a small number of fish eyes and excellent color. The issue of the interval until steady state is reached has not been considered

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process for production of aromatic polycarbonate resin
  • Process for production of aromatic polycarbonate resin
  • Process for production of aromatic polycarbonate resin

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] As a manufacturing method of an aromatic polycarbonate resin, a melt polymerization method (transesterification method), an interfacial polymerization method (phosgene method), etc. are mentioned, for example. By the melt polymerization method, an aromatic polycarbonate resin having an adjusted amount of terminal hydroxyl groups can be obtained.

[0028]Examples of aromatic dihydroxy compounds used as raw materials include 2,2-bis(4-hydroxyphenyl)propane (alias: bisphenol A), 2,2-bis(3,5-dibromo-4- Hydroxyphenyl) propane (alias: tetrabromobisphenol A), bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-bis(4-hydroxybenzene base) butane, 2,2-bis(4-hydroxyphenyl)octane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 1,1-bis(3-tert-butyl -4-hydroxyphenyl)propane, 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane, 2,2-bis(3-bromo-4-hydroxyphenyl)propane, 2 , 2-bis(3,5-dichloro-4-hydroxyphenyl)propane, 2,2-bis(3-phenyl-4-hydroxyphenyl)propane, 2,2-bis(3-cyclohexyl- 4-...

Embodiment

[0093] Hereinafter, the present invention will be described based on examples, but the present invention is not limited by these examples. The measurement of each physical property was performed by the following method.

[0094] (1) X-ray photoelectron spectroscopy (ESCA):

[0095] The filter material portion (fibrous) of the polymer filter was cut into 1 cm squares, and the ratio of the chromium atomic concentration to the iron atomic concentration on the outermost surface of the filter was measured using "Quantum 2000" manufactured by PHI Corporation. Monochromated AlKα rays were used as the X-ray excitation source, and the vicinity of the center of the fibrous sample was irradiated with an electron beam diameter of 20 μm. The energy spectrum of electrons emitted from the sample surface accompanying X-ray irradiation was measured under the conditions of an extraction angle of 45 degrees and a pass energy in the spectrometer of 58.7 eV. Background subtraction is performed o...

Embodiment 1B

[0121] In a nitrogen gas atmosphere, diphenyl carbonate (DPC) and bisphenol A (BPA) were mixed at a certain molar ratio (DPC / BPA=1.050) to prepare a raw material melt. Under the flow rate of 88.7kg / hour, the raw material molten liquid is continuously supplied into the first vertical stirred reactor with a capacity of 100 L through the raw material introduction pipe (the reactor is controlled at 220 ° C, 1.33 × 10 4 Pa), control the opening of the valve at the discharge line of the polymer disposed at the bottom of the reactor, so that the average residence time is 60 minutes, and the liquid level is kept constant. In addition, at the same time as the supply of the raw material melt was started, an aqueous cesium carbonate solution was continuously supplied as a catalyst, wherein the aqueous cesium carbonate solution was 1.0 micromole (with respect to 1 mole of bisphenol A, the amount of metal contained in it) 2.0 micromole) ratio of continuous supply.

[0122] Subsequently, t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

Disclosed is a process for producing an aromatic polycarbonate resin, which can prevent the deterioration of a product during the retention of the product in a filter, and which produces contaminants or phenol compounds in reduced amounts. In the production of a purified aromatic polycarbonate resin by treating a molten aromatic polycarbonate resin by using a polymer filter, the polymer filter tobe used is a filter in which the ratio of the chromium atom concentration to the iron atom concentration (Cr / Fr ratio) on its outermost surface is 1.5 or more as measured by X-ray photoelectron spectroscopy. In one preferred embodiment, the polymer filter to be used is a filter having a carbon film as the outermost surface thereof and an oxide coating film, wherein the carbon film has a thicknessof 10 nm or less and the oxide film has a depth-wise thickness of 100 nm or more both as measured by Auger electron spectroscopy.

Description

technical field [0001] The present invention relates to a method for preparing an aromatic polycarbonate resin, in particular, the present invention relates to a method for preparing an aromatic polycarbonate resin containing less foreign matter by using a specific polymer filter, and in addition, relates to a The preparation method of aromatic polycarbonate resin, it realizes switching operation by changing the reaction condition of transesterification method, thereby obtains the product with different grades (heterogeneous grade) with different viscosity-average molecular weight (Mv) and degree of branching. Background technique [0002] Aromatic polycarbonate resin not only has excellent mechanical properties such as heat resistance and impact resistance, and dimensional stability, but also is a resin with excellent transparency, so it is used in various applications. [0003] However, as a method for producing an aromatic polycarbonate resin, a melt polymerization method...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08G64/40
Inventor 内村竜次岩木光地
Owner MITSUBISHI RAYON CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com