公开(公告)号：EP1296830B1

公开(公告)日：2011-10-26

申请号：EP01941175.0

申请日：2001-06-22

申请人： Kureha Corporation

发明人： UEYAMA, Takahisa, Polymer Processing Tech. Center ,  ITOH, Tadayoshi, Polymer Processing Tech. Center ,  HIGASHI, Takeo, Kureha Kagaku Kogyo K.K.

IPC分类号： B32B27/34 ,  B29C71/02

CPC分类号： B29C71/02 ,  B29C35/049 ,  B29C47/0023 ,  B29C47/0026 ,  B29C47/0057 ,  B29C47/0059 ,  B29C47/065 ,  B29C47/26 ,  B29C55/023 ,  B29C55/28 ,  B29K2077/00 ,  B29K2995/0089 ,  B29L2007/008 ,  B29L2009/00 ,  B32B27/08 ,  B32B27/34 ,  B32B37/153 ,  Y10T428/24942 ,  Y10T428/31725 ,  Y10T428/31855

摘要： A stretch-oriented multilayer film suited for use as a freeze packaging material, a deep drawing packaging material, a vertical pillow packaging material, etc., is provided as a stretch-oriented multilayer film, comprising at least three layers including a surface layer (a) comprising a thermoplastic resin, an intermediate layer (b) comprising a polyamide resin and a surface layer (c) comprising a sealable resin, said multilayer film exhibiting an impact energy of at least 1.5 Joule at a conversion thickness of 50 νm at - 10°C. The multilayer film is produced through an inflation process using water having a large capacity as a cooling and a heating medium and including a combination of a high degree of stretching and a high degree of relaxation heat treatment not exercised heretofore.