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Method for making stable, homogeneous melt solutions

A melt, stable technology used in the preparation of stable, homogeneous melt solutions, which can solve problems such as expensive

Inactive Publication Date: 2006-01-25
SHPP GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Dichloromethane is a low-boiling chlorinated hydrocarbon and its application requires costly engineering measures to prevent its accidental release into the environment
This poses less difficulty but can pose serious engineering challenges when the diaryl carbonate and dihydroxyaromatic compound have a low melting point, where the melting point of the diaryl carbonate or dihydroxyaromatic compound exceeds 200°C

Method used

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  • Method for making stable, homogeneous melt solutions
  • Method for making stable, homogeneous melt solutions
  • Method for making stable, homogeneous melt solutions

Examples

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Embodiment

[0073] The following examples are described to provide a detailed description of how one of ordinary skill in the art may evaluate the methods claimed herein, and are not intended to limit the scope of the invention. Unless indicated otherwise, parts are by weight and temperatures are in degrees Celsius (° C.).

[0074] Melt Solution Formation Examples 1-5

[0075] Prepare a stable, homogeneous melt solution in a one-necked, round-bottomed flask fitted with a magnetic stir bar. Diaryl carbonate, high melting point bisphenol, tetrabutylphosphonium acetate were mixed under ambient conditions in the molar ratios shown in Table 1 and in amounts sufficient to generate a stable, homogeneous melt solution with a total weight of about 5 to about 40 grams. The catalyst, and optionally bisphenol A, are charged to the flask. The catalyst was added as a solution in water containing about 40% by weight tetrabutylphosphonium acetate (TBPA). The volume of TBPA catalyst solution added is f...

Embodiment 2

[0081] Example 2 and Comparative Examples 9-11 illustrate the preparation of a stable, homogeneous melt solution from a mixture of bis(methylsalicyl)carbonate (BMSC), 4,4'-diphenol, and transesterification catalyst TBPA. This data shows that a stable, homogeneous melt solution can be obtained in this three-component system, but requires a substantial amount of BMSC (4.55 molar equivalents relative to the high melting point component 4,4'-diphenol). Example 3 shows that this substantial excess of BMSC can be reduced if an additional component, in this case BPA, is added to the mixture. Finally, Examples 4 and 5 illustrate the formation of a stable, homogeneous melt solution of a mixture containing bisphenol as the first dihydroxyaromatic compound respectively at a temperature substantially below the melting point of the high melting point component bisphenol. Phenolic SBI (mp 212-215°C) and BPS (mp 245-247°C).

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Abstract

Stable, homogeneous melt solutions are prepared at temperatures of 200 DEG C or less from solid mixtures comprising at least one diaryl carbonate, at least one high melting dihydroxy aromatic compound (mp>200 DEG C), a transesterification catalyst, and optionally a lower melting dihydroxy aromatic compound. Thus, a stable, homogeneous melt solution is obtained from a solid mixture comprising 4,4'-biphenol(mp 282-284 DEG C) at a temperature of about 200 DEG C using either diphenyl carbonate or bis(methyl salicyl) carbonate as the diaryl carbonate component. It is shown that formation of the stable, homogeneous melt solutions requires the presence of the transesterification catalyst when substantial amounts of the high melting dihydroxy aromatic compound are present in the initial solid mixture. Solid mixtures comprising a variety of high melting bisphenols; 4,4'-biphenol; 3,3,3,3'tetramethylspirobiindanbisphenol, and 4,4'-sulfonydiphenol are converted to stable, homogeneousmelt solutions at 200 DEG C, a temperature substantially below the melting points of the high melting bisphenols in their pure states.

Description

Background technique [0001] The present invention relates to the preparation of stable, homogeneous melt solutions useful for the preparation of homopolycarbonates and copolycarbonates. [0002] Polycarbonate is widely used because of its combination of transparency, toughness, heat resistance, and plasticity. It is regarded as a relatively low-cost thermoplastic rate. The most widely used polycarbonate is bisphenol A polycarbonate, with hundreds of millions of pounds of bisphenol A polycarbonate produced and sold worldwide each year. [0003] Polycarbonates, both homopolycarbonates and copolycarbonates, can be advantageously prepared in the absence of solvents, a process sometimes referred to as heating diaryl carbonate in the molten state in the presence of a transesterification catalyst. "melt method" of base esters and one or more bisphenols. This melt method offers certain advantages over the widely used interfacial method of polycarbonate preparation using a solvent, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/30
CPCC08G64/307
Inventor 纳拉扬·拉梅什帕特里克·J·麦克洛斯基凯瑟琳·L·朗利
Owner SHPP GLOBAL TECH BV
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