Title:
BIAXIALLY ORIENTED POLYAMIDE FILM AND PROCESS FOR ITS PRODUCTION
Document Type and Number:
WIPO Patent Application WO/1990/003882
Kind Code:
A1
Abstract:
The invention relates to a process for heat setting a biaxially oriented polyamide film, which comprises heat setting a biaxially oriented film having a low anisotropy in hot water shrinkage ratio in a flat state, if desired, after preheating treatment, by heating the film in a temperature range of 40 to 10�C lower than its melting point in close contact with the surface of a heated material with both ends of the film clamped, and cooling the film to a temperature at which the film is not deformed easily. The invention also relates to a biaxially oriented polyamide film which has a hot water shrinkage ratio at 100�C of up to 5.0 % in all directions at all positions in the transverse direction and an anisotropy H (%) in hot water shrinkage ratio calculated according to the equation alpha of up to 30 %, preferably up to 20 %, wherein S45 and S135 represent hot water shrinkage ratios at 100�C in the directions at angles 45� and 135� left from the machine direction, respectively. This film is one which could not be obtained by the conventional tenter process, etc.
Inventors:
MIZUTANI TOMOJI (JP)
YOKOTA KATUYUKI (JP)
MISIRO KOUICHI (JP)
YOKOTA KATUYUKI (JP)
MISIRO KOUICHI (JP)
Application Number:
PCT/JP1989/000941
Publication Date:
April 19, 1990
Filing Date:
September 14, 1989
Export Citation:
Assignee:
KOHJIN CO (JP)
International Classes:
B29C55/12; B29C55/26; B29C71/02; B29D7/01; C08J5/18; B29K77/00; B29L7/00; (IPC1-7): B29C55/12; B29C71/02
Foreign References:
| JPH05787331A | ||||
| JPH0687036A | 1994-03-29 | |||
| JPS61177229A | 1986-08-08 | |||
| JPS61244527A | 1986-10-30 |
Other References:
See also references of EP 0392025A4
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