Styrene polymer molding material and process for preparing same
AssigneeIdemitsu Kosan Co., Ltd.
InventorsKomei Yamasaki, Funaki Keisuke
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Abstract
Disclosed are a styrene polymer molding material which has a high degree of syndiotacticity, a weight average molecular weight of 50,000 or more, and at least one melting points of 285.degree. C. or higher, and a process for producing the same by melting a styrene polymer having a high degree of syndioacticity and then molding it under a stress of 1.times.10.sup.6 dyne/cm.sup.2 or higher. The styrene polymer molding material of the present invention has excellent heat resistance. In addition, according to the process of the present invention, the above polymer molding material having excellent heat resistance can be prepared by a simple operation, and thus has marked advantages for practical use.
Claims13
A molding material of styrene polymer having a high degree of syndiotacticity, a weight average molecular weight of 50,000 or more, and at least one melting point in the surface layer or subsurface parts thereof of the molding material in the range of 285.degree. C. to 300.degree. C. and, if present, an inner portion having a conventional syndiotactic configuration and a melting point no higher than 275.degree. C., as measured by differential scanning calorimeter with a temperature rising rate of 20.degree. C./min.
Dependencies are inferred from the claim text.