Method for controlling surface concentration of a polymer additive
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United States of America Patent
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Oct 5, 1999
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N/A
app pub date -
Nov 12, 1996
filing date -
Nov 15, 1995
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Abstract
The surface free energy of a polymer blend where a base polymer contains an additive having a different surface free energy than that of the base polymer can be controlled over a wide range of additive surface concentrations by appropriate choice of the mold surface free energy during fabrication. A high surface concentration of additive relative to a low bulk concentration can be achieved, leading to improved biocompatibility without loss of optical clarity.
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