HEAT-TREATED, NON-ORIENTED (CO)POLYMERIC FILMS AND METHODS FOR MAKING THE SAME USING AN ORIENTED CARRIER FILM
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United States of America Patent
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Issued Date -
Jul 14, 2022
app pub date -
May 22, 2020
filing date -
May 31, 2019
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Abstract
A heat-treated non-oriented principal film including a cast (co)polymeric component that is not capable of thermally-induced self-forming. The heat-treated principal film has first and second opposed major faces and at least one modification zone on the first major face, each modification zone including a central portion and a rim portion surrounding the central portion. Each rim portion is surrounded by a land portion. An average thickness of each rim portion is greater than an average thickness of the land portion surrounding each modification zone, and an average thickness of each central portion is less than the average thickness of the land portion, or zero. The first major face of the heat-treated principal film may be positioned in contact with an oriented carrier film including a molecularly-oriented (co)polymer that exhibits a relaxation temperature (Tr). Methods of making such films and hand-tearable adhesive articles including such films are also disclosed.
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