| 摘要 |
1472413 Moulding oriented ethylene-propylene copolymers MITSUI TOATSU CHEMICALS Inc 25 Sept 1974 [27 Sept 1973] 41755/74 Heading B5A [Also in Division C3] Articles, e.g. containers, obtained by biaxial orientation of an extruded tubular body at a temperature below the melting point, whereby extension longitudinally and laterally by at least a factor of 1À5 is achieved, are made from a statistical random copolymer of propylene and ethylene having a melt index of 0À6-3À0 g./10 min. and an ethylene content of 0À3-5À0% by wt. Preferably aluminium or sodium ptert-butyl benzoate is present as a nucleating agent. The biaxial orientation is effected by blow moulding. |
