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Process for the production of branched melt polycarbonate by late addition of fries-inducing catalyst

A technology of polycarbonate and catalyst, applied in the field of branched polycarbonate composition, can solve problems such as high cost

Inactive Publication Date: 2005-05-25
SABIC GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These disadvantages are quite costly, especially when the production unit changes frequently between producing linear and branched polycarbonate

Method used

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  • Process for the production of branched melt polycarbonate by late addition of fries-inducing catalyst
  • Process for the production of branched melt polycarbonate by late addition of fries-inducing catalyst
  • Process for the production of branched melt polycarbonate by late addition of fries-inducing catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Example 1: A batch reactor tube was charged with 50 grams of polycarbonate A and 2.5 x 10 -6 moles of NaOH (relative to 1 mole of bisphenol acetone). The mixture was heated to a temperature of 310°C and stirred for 20 minutes. After the melt mixing stage, vacuum was applied to the system to a pressure of 0.5 mbar and the reaction was continued for 30 minutes. After 30 minutes, the pressure was increased to atmospheric pressure and 13.5 ppm butyl tosylate (relative to polymer material) was added to the melt and stirred for an additional 5 minutes. After the reaction, the polymer was sampled from the reaction tube. As summarized in Table 2, the MIR increased from 1.1 to 2.0.

Embodiment 2

[0086] Example 2: A batch reactor tube was charged with 50 grams of polycarbonate A and 7.5 x 10 -6 moles of NaOH (relative to 1 mole of bisphenol acetone). The mixture was heated to a temperature of 310°C and stirred for 20 minutes. After the melt mixing stage, vacuum was applied to the system to a pressure of 0.5 mbar and the reaction was continued for 30 minutes. After 30 minutes, the pressure was increased to atmospheric pressure and 40.5 ppm butyl tosylate (relative to polymer material) was added to the melt and stirred for an additional 5 minutes. After the reaction, the polymer was sampled from the reaction tube. As summarized in Table 2, the MIR increased from 1.1 to 3.7.

Embodiment 3

[0087] Embodiment 3: repeat embodiment 2, but do not use sodium hydroxide, will 7.5 * 10 -6 A mole of disodium sebacate (D) (relative to 1 mole of bisphenolacetone) was added to the polymer. As summarized in Table 2, the MIR increased from 1.1 to 2.8.

[0088]

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Abstract

The invention relates to a method for the production of a branched polycarbonate composition, having increased melt strength, by late addition of branch-inducing catalysts to the polycarbonate oligomer in a melt polycondensation process. Surprisingly, it has been found that by adding branch-inducing catalysts, such as alkali metal compounds and / or alkaline earth metal compounds, to the melt polycarbonate oligomer at a later stage of the melt polycondensation process, preferably after the oligomer has reached an average molecular weight of between about 3,000 and 30,000 g / mole, a unique branched polycarbonate composition is formed that has improved properties. It is believed that the addition of the branch-inducing catalysts at the later stages of the process produces a branched polycarbonate composition having longer chains between the branching points, and thus a new composition is produced. The invention also relates to various applications of the branched polycarbonate composition.

Description

technical field [0001] The present invention relates to a method for producing branched polymers with increased melt strength by late addition of branch-inducing catalysts to polycarbonate oligomers in a melt polycondensation process. Methods of polycarbonate compositions; resulting branched polycarbonate compositions; and various applications of the branched polycarbonate compositions. Background technique [0002] Polycarbonate has excellent mechanical properties, such as impact resistance and heat resistance, and has excellent transparency. It is widely used in many engineering applications. In a typical process for the production of polycarbonate, an aromatic dihydroxy compound such as bisphenol A (BPA) and a diaryl carbonate such as diphenyl carbonate (DPC), react in a molten state in a transesterification process . This is called a melt polycondensation process or a transesterification process. The resulting polycarbonate can be extruded or otherwise processed and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/00C08G64/20C08G64/30
CPCC08G64/307C08G64/02C08G64/30
Inventor 丹尼斯·卡利克汉斯·P·布拉克亨德里克·维胡格特约翰·P·莱蒙简·H·坎普斯威廉·L·塞德里尔约翰尼斯·M·D·古森斯
Owner SABIC GLOBAL TECH BV
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