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US4865946A Temporary barrier layer for photographic element 失效
摄影元素临时屏障层

Temporary barrier layer for photographic element
摘要:
A polymer composition of the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, G, J, L, x, y, and z are as defined herein is useful as a temporary barrier between reactants in photographic materials. The barrier is particularly useful as a process timing layer in color image transfer film units.
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