Phthalocyanine compounds, process for producing the same, and near infrared absorbent comprising the same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Oct 22, 2002
Grant Date -
N/A
app pub date -
Oct 10, 2000
filing date -
Mar 30, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a novel phthalocyanine compound which absorbs in a near-infrared region of 700.about.1000 nm with little absorption in the visible region of the spectrum and can be applied with advantage to a near-infrared light-absorbing filter for plasma display, a secret ink and other applications and to a process for producing the phthalocyanine compound. The above phthalocyanine compound has the following general formula (I). A near-infrared light-absorbing material containing the same is also provided. ##STR1## wherein R.sub.1.about.R.sub.8 represents alkyl or alkoxyalkyl; X.sub.1.about.X.sub.8 represents sulfur or >NR.sub.9 ; X.sub.1 =(either X.sub.3 or X.sub.4)=(either X.sub.5 or X.sub.6)=(either X.sub.7 or X.sub.8)=sulfur and X.sub.2 =(the other one of X.sub.3 and X.sub.4)=(the other one of X.sub.5 and X.sub.6)=(the other one of X.sub.7 and X.sub.8)=>NR.sub.9 ; R.sub.9 represents an acyl group which may optionally be substituted or an aroyl group which may optionally be substituted; M represents a couple of hydrogen atoms, a divalent metal, a trivalent metal derivative or a tetravalent metal derivative).
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