B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 55/12 (2006.01) B29C 55/14 (2006.01) C08J 5/18 (2006.01) G11B 5/73 (2006.01)
Patent
CA 2081276
The invention relates to oriented films having all of the following characteristics: F5 MD ~ 18 daN/mm2, F5 TD ~ 10 daN/mm2, EMD ~ 800 daN/mm2, ETD ~ 400 daN/mm2, EMD + ETD ~ 1200 daN/mm2, RMD 105 ~ 1.5%, RMD 150 ~ 5.2%, Rr TD/F5 TD ~ 2.2; and their preparation using a filming process based on reverse sequence stretching following longitudinal stretching under conditions producing a mono-stretched film with axial birefraction not exceeding 0.015 and average refraction index not exceeding 1.5775. The invention also relates to the use of the said films as magnetic coating media.
L'invention concerne des films orientés présentant l'ensemble des caractéristiques suivantes: F5 MD ~ 18 daN/mm2, F5 TD ~ 10 daN/mm2, EMD ~ 800 daN/mm2, ETD ~ 400 daN/mm2, EMD + ETD ~ 1200 daN/mm2, RMD 105 ~ 1,5%, RMD 150 ~ 5,2%, Rr TD/F5 TD ~ 2,2; et leur obtention par un procédé de filmature mettant en oeuvre un étirage en séquence inverse précédé d'un étirage longitudinal réalisé dans des conditions conduisant à un film monoétiré présentant une biréfringence axiale inférieure ou égale à 0,015 et un indice moyen de réfraction inférieure ou égal à 1,5775. L'invention concerne également l'emploi desdits films comme supports de revêtements magnétique.
Gerwig Dominique
Lorentz Gilles
Stevenson Timothy
Rhone-Poulenc Films
Robic
LandOfFree
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