| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a film having a thickness lower than 10μm by a bubble blow molding by mixing a resin melt with an arom. tetracarboxylic dianhydride, extruding the mixture, and further extruding the resultant extrudate. SOLUTION: This film, having a thickness lower than 10μm, is obtd. by the bubble blow molding of an arom. polyester resin contg. an arom. tetracarboxylic dianhydride. Pyromellitic dianhydride is suitable as the dianhydride and is used in an amt. of about 0.01-2wt.%. Other usable examples of the dianhydride are ones of 3,3',4,4'-diphenyltetracarboxylic acid, 3,3',4,4'- tetracarboxylic acid benzophenoxybis(3,4-dicarboxyphenyl) ether, and bis(3,4- dicarboxyphenyl) sulfone.</p> |
