Method of producing ultraviolet radiation absorbent
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United States of America Patent
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-
Jan 9, 2007
Grant Date -
Sep 15, 2005
app pub date -
Apr 5, 2005
filing date -
Nov 20, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An ultraviolet radiation absorbent for thermoplastic polymer materials such as polyethylene terephthalate or polycarbonate contains cyclic imino ester compound of a specified structure in an amount of over 99.5 weight % and less than 100 weight % and having an acid value in the range of 1.times.10.sup.-3 1 and/or a chlorine ion content in the range of 1.times.10.sup.-1 1.times.10.sup.3 ppm.
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