Doubly oriented film of polyvinylidene fluoride

Details Doubly oriented film of polyvinylidene fluoride Doubly oriented film of polyvinylidene fluoride

B - Operations, Transporting

29

C

18/1041

B29C 55/14 (2006.01) B29C 55/00 (2006.01) C08J 5/00 (2006.01) C08J 5/18 (2006.01) H01G 7/02 (2006.01) H01L 41/26 (2006.01)

Patent

CA 1147521

ABSTRACT Polyvinylidene fluoride wherein Form I crystals predomin- ate in the crystalline region thereof, said Form I crystals being doubly oriented. Such polyvinylidene fluoride can be prepared as a film by a process which comprises (i) cooling rapidly a melt of a polyvinylidene fluoride which shows an inherent viscosity at a temperature of 30°C of 1.0 to 1.8 dl/g so as to obtain a film of the polyvinylidene fluoride exhibiting a sub-peak:main-peak height ratio of less than 0.6:1 as determined by differential scanning calorimetory when raising the temperature of the film, at a rate of 8°C/min, (ii) stretching the film of polyvinylidene fluoride in a first direction to 3 to 6 times its unstretched length at a temp- erature of 50 to 170°C, and (iii) stretching the film obtained in step (ii) at a temp- erature which is from 80 to 150°C and which is within 60°C of the stretching temperature of step (ii), in a second direction which is substantially perpendicular to the direction in which the un- stretched film was stretched in step (ii), and by from more than 3 times its unstretched length in the second direction to less than the elongation at break. The polyvinylidene fluoride may be used in capacitors or piezo- or pyro- electric devices.

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