Reversibly transparent-translucent film and method of making sam

Details Reversibly transparent-translucent film and method of making sam Reversibly transparent-translucent film and method of making sam

1978-04-24

1980-06-10

Sikes, William L.

B29D 2700

Patent

active

042069807

ABSTRACT:
Normally transparent films which can be rendered translucent by stretching and transparent by relaxing the film are provided. The films comprise a blend of crystallizable polymer with a compound with which the polymer is miscible at a temperature above the crystallization temperature of the crystallizable polymer-compound blend but immiscible at a temperature below the crystallization temperature of the blend. The films are prepared by blending the crystallizable polymer with the compound under melt conditions, casting a film of the blend and cooling to solidify the blend.

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