Unlock instant, AI-driven research and patent intelligence for your innovation.

Depolymerization method of polycarbonate resin having fluorene structure

A polycarbonate resin, depolymerization technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of bisphenols stability, different solubility, etc., and achieve remarkable results

Active Publication Date: 2017-07-28
TAOKA CHEM COMPANY
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a method for recovering bisphenoxyol fluorenes from a polycarbonate resin having bisphenoxyl fluorenes having an alkyl alcohol structure as a terminal part subjected to hydrolysis as a raw material, the state of the carbonate bond, the recovered The stability, solubility, etc. of bisphenols are different, so it cannot be called the most suitable depolymerization method

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
  • Depolymerization method of polycarbonate resin having fluorene structure
  • Depolymerization method of polycarbonate resin having fluorene structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0049] Hereinafter, although an Example is given and this invention is demonstrated in more detail, this invention is not limited to these Examples.

[0050] For each measured value of the bisphenoxyl fluorenes and the polycarbonate resin, the following methods and measurement conditions were followed.

[0051] [1] HPLC purity

[0052] The area percentage value when HPLC measurement was performed under the following measurement conditions was taken as the HPLC purity of each component.

[0053] ・Device: "LC-2010AHT" manufactured by Shimadzu Corporation

[0054] ・Column: "L-column ODS" produced by the Chemical Substance Evaluation Research Institute of the General Incorporated Foundation

[0055] (5μm, 4.6mmφ×250mm)

[0056] ·Column temperature: 40℃

[0057] Detection wavelength: UV 254nm,

[0058] Mobile phase: A solution = water, B solution = acetonitrile

[0059] ·Mobile phase flow rate: 1.0ml / min

[0060] Mobile phase gradient: B solution concentration: 30% (0 minute...

Synthetic example 1

[0067] 20.00 parts by weight of 9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorene (HPLC purity 98.7%, melting point 161° C.), 10.10 parts by weight of diphenyl carbonate, and sodium bicarbonate as a polymerization catalyst 2.2×10 -5 Add parts by weight into a reaction vessel equipped with a stirrer and a distillation device, heat to 200° C. under a nitrogen atmosphere, and stir for 20 minutes to completely melt. Then, the degree of reduced pressure in the reaction container was adjusted to 27 kPa, and it stirred at 200 degreeC for 40 minutes, 210 degreeC for 40 minutes, and 220 degreeC for 50 minutes. Then adjust the decompression degree and temperature, stir at 24kPa, 230°C for 30 minutes, and stir at 20kPa, 240°C for 50 minutes, then use 1 hour to make the decompression degree in the reaction vessel below 133Pa, and at 240°C, 133Pa or less The mixture was stirred for 1 hour to obtain a polycarbonate resin (weight-average molecular weight: 28,000, glass transition temperature: 152°...

Synthetic example 2

[0069] 18.09 parts by weight of 9,9-bis[2-(2-hydroxyethoxy)-4-methylphenyl]fluorene (HPLC purity 99.0%, melting point 172°C), 8.60 parts by weight of diphenyl carbonate and as a polymer Catalyst sodium bicarbonate 2.0 x 10 -5 Add parts by weight into a reaction vessel equipped with a stirrer and a distillation device, heat to 200° C. under a nitrogen atmosphere, and stir for 20 minutes to completely melt. Then, the degree of reduced pressure in the reaction container was adjusted to 27 kPa, and it stirred at 200 degreeC for 30 minutes, 210 degreeC for 50 minutes, and 220 degreeC for 30 minutes. Then adjust the decompression degree and temperature, stir at 24kPa, 230°C for 30 minutes, and stir at 20kPa, 240°C for 50 minutes, then use 1 hour to make the decompression degree in the reaction vessel below 133Pa, and at 240°C, 133Pa or less The mixture was stirred for 30 minutes under the condition of , to obtain a polycarbonate resin (weight average molecular weight: 27500, glass ...

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
glass transition temperatureaaaaaaaaaa
glass transition temperatureaaaaaaaaaa
Login to View More

Abstract

The present invention is a method for collecting a bisphenoxy alcohol fluorene compound, which is a starting material for the production of a polycarbonate resin having a fluorene structure, from a waste polycarbonate resin having a fluorene structure with high purity and with high efficiency, said method being characterized by comprising reacting a polycarbonate resin having a fluorene structure, which is produced using a bisphenoxy alcohol fluorene compound as a starting material, using an aqueous metal hydroxide solution in the presence or absence of a specific organic solvent under mild conditions.

Description

technical field [0001] The present invention relates to a novel decomposition method of polycarbonate resin capable of recovering bisphenoxyalcohol fluorenes as its starting material with high purity and efficiently from waste polycarbonate resin having a fluorene structure. Background technique [0002] Polycarbonate resin with a fluorene structure has a high refractive index, low birefringence, transparency, processability, and heat resistance, and its use has increased in recent years as optical resin materials such as optical lenses and optical films. . In addition, as the demand for polycarbonate resins containing a fluorene structure increases, the amount of discarded resins also increases, so it is important to recycle them. In particular, since bisphenoxyalcohol fluorenes, which are one of the starting materials, are more expensive than other materials, it is desired to develop a method for efficiently recovering them as reusable raw materials. [0003] As a 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): C07C41/26C07C43/23
CPCC07C41/26C07C43/23C08J11/10
Inventor 平林俊一藤井克宏
Owner TAOKA CHEM COMPANY