| 摘要 |
For some uses in the photographic field, practically perfect dimensional stability (resistance to visible distortion and shrinkage less than 0.5 percent is required of sensitized film which is exposed to temperatures as high as 240 DEG -250 DEG C for a few seconds without edgewise restraint. Conventional cellulose ester films cannot meet such rigid requirements. It has now been found that cellulose triacetate film that (a) contains at most a few percent of plasticizer, (b) is fairly highly crystalline, and (c) is substantially free of visible distortion and haze (less than about 3 percent can meet these requirements that involve excellent high temperature dimensional stability).
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