Method for forming controlled release polymeric substrate
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United States of America Patent
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Jan 30, 1996
Grant Date -
N/A
app pub date -
Aug 13, 1993
filing date -
Aug 13, 1993
priority date (Note) -
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Abstract
A method for forming a controlled release polymeric substrate is provided by contacting a polymeric substrate with a liquid mixture containing a cross-linking agent at least partially soluble therein comprising water and an organic liquid, for a period of time and at a temperature and concentration of the agent sufficient for the agent to penetrate the substrate to form cross-linking bridges in the substrate in a decreasing concentration gradient beneath the surface.
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