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method to control the effective katalysatormenge in the presentation of polycarbonate by umesterung
method to control the effective katalysatormenge in the presentation of polycarbonate by umesterung
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机译:umesterung提出的控制聚碳酸酯中有效katalysatormenge的方法
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摘要
A method for determining the effective level of catalyst for the preparation of a polycarbonate polymer by a transesterification reaction is disclosed. The method involves measurement of the leaving group by-product (usually phenol) produced in a test reaction between an aromatic dihydroxy compound and a carbonic acid diester, in the presence of a known amount of transesterification catalyst. The by-product production values can be compared with by-product reference values to calculate the effective level of catalyst. This data can be used to efficiently control catalytic activity in a production scale reaction for producing polycarbonate polymer. IMAGE
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