Pigments and compositions for use in laser marking
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United States of America Patent
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Nov 30, 2004
Grant Date -
Oct 24, 2002
app pub date -
Nov 21, 2001
filing date -
Nov 21, 2000
priority date (Note) -
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Abstract
Pigments and compositions for use in laser marking. A colorless UV-absorbing pigment at least partially coated with a synergist has the formula [R.sub.m (SiO.sub.n)].sub.p R'.sub.q, wherein (a) m is 1 to 3, n is 1 to 3, p is at least 1, and q is 0 to 3, and (b) at least one R or R' is a substituent that upon pyrolysis generates a black material suitable for providing a mark. Such pigments are useful in fluoropolymers used for wire and cable insulation.
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