Method for forming bilayer patches
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United States of America Patent
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Sep 22, 2015
Grant Date -
Aug 21, 2014
app pub date -
Apr 24, 2014
filing date -
Nov 7, 2011
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Abstract
A method for injection molding thin materials (sub-millimeter) having low green strength could make certain manufacturing processes significantly more efficient yet has heretofore been unavailable. Provided herein is a method that enables injection molding of thin materials by using a mold with contact surfaces having a low surface energy release agent disposed thereon. The low surface energy release agent may be applied as a coating on a conventional mold or the mold itself or just the contact surfaces thereof may be formed of a low surface energy release material. The method finds particular applicability in making special contour patches for medical and cosmetic implants and prosthetics. A preferred approach involves injection molding a thin layer of unvulcanized material on a cold mold, injection molding a thin layer of vulcanized material on a hot mold, transferring the vulcanized layer to the unvulcanized layer on the cold mold, and removing the combined layers.
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