| abstract |
PURPOSE:To prepare the titled film at an extremely high film-forming speed (about 10m/min or higher), by melt-extruding a raw polymer having specified organic compounds incorporated therein. CONSTITUTION:About 0.1-1pt.wt. one or more of 1,3:2,4-bis(methylbenzylidene) sorbitol, dibenzylidenesorbitol, and sodium bis(4-t-butylphenyl)phosphate are incorporated into 100pts.wt. trans-1,4-polyisoprene. The obtained composition is melt-extruded at about 180-220 deg.C using a T-die, etc., and immediately wound around a cooling roll to be cooled and solidified, thus forming a film. By the above-mentioned process, a thin film with a thickness of about 20mu or less can be manufactured easily at a high film-forming speed. |