Ultraviolet radiation absorbents for thermoplastic polymers and methods of producing same
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United States of America Patent
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Jun 6, 2006
Grant Date -
Jul 10, 2003
app pub date -
Nov 14, 2002
filing date -
Nov 20, 2001
priority date (Note) -
Expired
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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 %, having the melt beginning temperature obtained by melting point measurement in differential thermal analysis within the range of 300 310.degree. C. and/or the weight loss beginning temperature obtained by thermogravimetric measurement within the range of 270 305.degree. C.
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