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Polycarbonate composition for producing optical quality products with high quality and good processability

A technology of polycarbonate and composition, applied in the field of production of molten polycarbonate, can solve the problems of composition unsuitable for medium storage application, reduced optical properties, and reduced optical quality, etc.

Active Publication Date: 2021-02-09
SABIC GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the GMS molecule contains hydroxyl groups that can react with polycarbonate in the presence of an active catalyst, which leads to a reduction in optical properties, rendering the composition unsuitable for media storage applications
PETS has shown good stability in unquenched polycarbonate, but has also been shown to degrade the optical quality of discs molded from it

Method used

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  • Polycarbonate composition for producing optical quality products with high quality and good processability
  • Polycarbonate composition for producing optical quality products with high quality and good processability
  • Polycarbonate composition for producing optical quality products with high quality and good processability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0098] Such as figure 1 As shown, experiments were performed in a continuous melt polycarbonate unit. In the experiment, 39.8 kilograms per hour (kg / h) of BPA and 37.3 kg / h of DPC and capping agent were fed to a continuous stirring premixer 10, which was operated at atmospheric pressure and a temperature of 160 to 180°C. Mixer 10. A 3.2 wt % aqueous solution of tetrabutylphosphonium acetate was also added to the premixer at a rate of 75 to 95 milliliters per hour (mL / h).

[0099] The outlet stream of the premixer 10 is then pumped to a continuously stirred first oligomerization vessel 20 operating at 240 to 270° C. and a vacuum of 150 to 200 mbar atmospheric (mbar absolute). A gaseous phase containing phenol and unreacted monomers BPA and DPC was removed from the oligomerization vessel 20 and continuously distilled in a scrubber 50 in which the reflux ratio was adjusted so that the column head temperature was 125 to 130° C., thereby producing high-purity phenol. Unreacted B...

Embodiment approach 1

[0108] Embodiment 1: A method for preparing a polycarbonate composition comprising: melt polymerizing a dihydroxy compound and a carbonate compound in the presence of a catalyst to form a polycarbonate; and adding 1 to 400 ppm of glyceryl tristearate to form A polycarbonate composition, wherein the polycarbonate composition is unquenched, wherein the polycarbonate has a weight average molecular weight of 8,000 to 19,000 Daltons as determined by gel permeation chromatography based on polycarbonate standards.

Embodiment approach 2

[0109] Embodiment 2: The method according to Embodiment 1, comprising adding 1 to 200 ppm of glyceryl tristearate.

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Abstract

The method for preparing the polycarbonate composition comprises melt polymerizing a dihydroxy compound and a carbonate compound in the presence of a catalyst to form a polycarbonate; and adding 1 to 400 ppm of glyceryl tristearate to form the polycarbonate composition , wherein the polycarbonate composition is unquenched.

Description

technical field [0001] The present disclosure generally relates to the production of unquenched (unquenched) molten polycarbonate. Background technique [0002] Melt polymerization of polycarbonate is generally accomplished by reacting a bisphenol compound with a carbonate compound in the presence of a catalyst in a series of reactors. After polymerization is complete, the catalyst (referred to herein as quenched polycarbonate) is typically quenched, and any additives are added to produce a polycarbonate composition. Produced by the melt polycondensation method for media storage applications (such as CD, DVD, and BLU-RAY TM Disc) polycarbonate compositions, when there is no quenching catalyst (referred to herein as unquenched polycarbonate), often experience quality problems, such as degradation of optical properties. This reduction in optical quality may ultimately reduce the suitability of unquenched polycarbonates for media storage applications. [0003] A reduction in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K5/103C08L69/00B29C48/04
CPCC08G64/307B29B7/46B29B7/603B29B7/748B29B7/7485B29B7/88B29B9/06B29C48/022B29C48/0022B29C48/04C08J3/203C08J2369/00C08K5/11B29B9/10B29K2069/00C08L69/00C08J3/201C08K5/103C08K5/526
Inventor 伊格纳西奥·维克·费尔南德斯大卫·德尔·阿瓜·埃尔南德斯科内利斯·扬·玛丽亚·赖肯
Owner SABIC GLOBAL TECH BV