Laser markable polytetrafluoroethylene resin material and method of making
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United States of America Patent
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Mar 26, 1996
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app pub date -
Feb 8, 1995
filing date -
Jan 29, 1993
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Abstract
A laser markable composite material which when so marked retains good color contrast after heat aging. The material comprises polytetrafluoroethylene resin, photosensitive filler material and an extrusion aid. The photosensitive material is preferably a metal oxide and has a larger mean particle size than typical pigments. Also disclosed is a sequence of milling, mixing and blending steps which forms the desired composite material.
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