| 摘要 |
PURPOSE:To obtain a film for the shrink package which is not easily tearable during shrinking and being of soft and excellent transparency and glossiness, less blocking, being of relatively good low temperature shrinking property and low temperature resistance by a method wherein the stretching treatment is applied to random copolymer which satisfies the specified conditions and is composed of propylen and alpha-olefin with carbon number above 4 or propylen, alpha-olefin with carbon number above 4 and ethylen. CONSTITUTION:In propylen series copolymer, as for comonomer, alpha-olefin with carbon number above 4 is used individualy or furthermore very small volume of ethylene is used jointly. In copolymer, the content of alpha-olefin with carbon number above 4 is 8-30mol%, and the content of ethylen being below 3mol%, and cold xylene soluble part is made 15-60wt% and boiling n-heptane insoluble part is made above 7wt%, and the stretching treatment is applied for this sort of copolymer. |
