The present invention relates to aliphatic polyester microfibers, films having
a microfibrillated surface, and methods of making the same. Microfibers of the
invention can be prepared by imparting fluid energy, typically in the form of high-pressure
water jets, to a highly oriented, highly crystalline, aliphatic polyester film
to liberate microfibers therefrom. Microfibrillated films of the invention find
use as tape backings, filters for particulate contaminants, such as face masks
and water or air filters, fibrous mats, such as those used for removal of oil from
water and those used as wipes, and thermal and acoustical insulation. Microfibers
of the invention, when removed from the film matrix may be used in the preparation
of woven or nonwoven articles and used as wipes for the removal of debris or dust
from a surface. The microfibers and microfibrillated articles of the invention
may be biodegradable, rendering them useful for geotextiles.
