Title:
【発明の名称】二軸延伸ポリエステルフィルムおよびその製造方法
Document Type and Number:
Japanese Patent JP3316852
Kind Code:
B2
Abstract:
A biaxially oriented polyester film wherein the ratio (=IMD /IND) of the peak intensity (IMD) in the longitudinal direction to the peak intensity (IND) in the thickness direction determined at 1615 cm<-1> by laser Raman scattering method is not less than 6; and a process for production of a biaxially oriented polyester film which comprises the steps of controlling the ratio (A/B) of the maximum thickness (A) of the edge portion of a cast film to the thickness (B) of the central portion in the transverse direction thereof in the range of 2 to 6, biaxially stretching the cast film, and controlling the peak intensity ratio of the biaxially oriented film determined by the laser Raman scattering method in the above-described range. The biaxially oriented polyester film thus produced has a specific orientation in the longitudinal direction, and therefore has great strength in the longitudinal direction and small irregularity in properties such as thickness or birefringence.
Inventors:
Minoru Yoshida
Kenji Tsunashima
Katsuya Toyoda
Hidehito Minamizawa
Kenji Tsunashima
Katsuya Toyoda
Hidehito Minamizawa
Application Number:
JP50861696A
Publication Date:
August 19, 2002
Filing Date:
August 28, 1995
Export Citation:
Assignee:
Toray Industries, Inc.
International Classes:
B29C55/06; B29C55/12; C08J5/18; (IPC1-7): B29C55/12; B32B27/36; C08J5/18; G11B5/73
Domestic Patent References:
| JP6392434A | ||||
| JP6287321A | ||||
| JP50133276A | ||||
| JP5522915A | ||||
| JP4259535A | ||||
| JP429270B1 | ||||
| JP433040B1 | ||||
| JP461119B1 | ||||
| JP461120B1 |
Attorney, Agent or Firm:
Toshimitsu Ban