B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/1039
B29D 7/20 (1980.01)
Patent
CA 1039914
Abstract of the Disclosure There is provided a monoaxially oriented, post-heat treated poly- ester film which is characterized in that (i) the through view pattern of wide angle X-ray diffraction of the film is diffuse halo, (ii) when the film is heated, while maintained at a fixed width and length, under the temperature rise from room temperature to 160 C. at a rate of 10°C./min., and then at 160°C. for 30 minutes, the aximuthal scan of (100) diffraction in the film's through view pattern shows four peaks, and, when measured with the direction of the monoaxial orientation of the film set parallel with the meridianal direction of said pattern, two pairs of the above peaks confronting each other across the equator, as each connected by the straight lines passing through the center of said pattern, form a central angel (.theta.) including the equator line of at least 35° but less than 180°, (iii) when the film is dipped in 90°C. hot water for 10 seconds, and shrinkage in the monoaxially oriented direction is no greater than 25% based on the original length of the film before the dipping, and (iv) that the film has a density of no higher than 1.340 g/m? at 25°C. There is further provided a process for preparation of the film. The film has improved dimensional stability at elevated tempera- tures.
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