| 摘要 |
PURPOSE:To produce the titled resin with low impurity and fish eye contents, by drying a vinyl chloride polymer with air which has passed through a specified filter. CONSTITUTION:A vinyl chloride polymer which is produced by passing all the principal and auxiliary materials that are fed to a polymerization tank through filters of a pore diameter <=20mum is dried with dry air which has passed through a filter of a pore diameter <=20mum, such as a high-mesh gauze or a sintered metal filter. EFFECT:It is possible to obtain a molding of uniform electrical and mechanical properties, because no gel is formed when molding the resin. USE:High-density recording medium.
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