Patent
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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Krueger Dennis L.
Volgren Richard L.
Alexander Cruzan
Francis Richard
Minnesota Mining and Manufacturing Company
Sell Donald M.
Sikes William L.
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