Reversibly transparent-translucent film and method of making...

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

B - Operations, Transporting

29

C

18/1032

B29C 47/88 (2006.01) C08J 5/18 (2006.01)

Patent

CA 1125979

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 crystal- lization temperature of the crystallization 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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