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OPPSKUMBART POLYMERISAT PAA BASIS AV POLYFENYLENOKSID OG EN VINYLAROMATISK FORBINDELSE, FREMGANGSMAATE TIL FREMSTILLING AV POLYMERISATET OG ANVENDELSE AV DETTE.
OPPSKUMBART POLYMERISAT PAA BASIS AV POLYFENYLENOKSID OG EN VINYLAROMATISK FORBINDELSE, FREMGANGSMAATE TIL FREMSTILLING AV POLYMERISATET OG ANVENDELSE AV DETTE.
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机译:基于聚氧化乙烯和紫罗兰色化合物的可粉碎聚合,用于制备和使用聚合物的方法。
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摘要
Hitherto, heat distortion resistant foams based on polyphenylene oxide and a vinylaromatic compound have been prepared by polymerising the vinylaromatic compound in the presence of polyphenylene oxide. The finished polymer blend is then granulated, mixed with the blowing agent in the extruder and subsequently expanded. This process is complex and expensive. In the process according to the invention, the foamable polymer is prepared in a one-step process, ie. the mixing with the blowing agent takes place during the polymerisation. In addition, caking on the reactor walls is prevented by adding the starting materials in a specific sequence, which results in an increase in yield. Expansion then follows. The foams produced from the foamable polymers are preferably employed for thermal insulation.
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