Polymethine compound and near-infrared absorbing material comprising same
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United States of America Patent
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Apr 6, 2004
Grant Date -
Dec 18, 2003
app pub date -
Jun 4, 2003
filing date -
Jun 7, 2002
priority date (Note) -
Expired
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Abstract
The invention provides novel compounds which show high sensitivity to near-infrared rays in the region of 750-950 nm and, when processed to give films and so forth, undergo only slight discoloration and retain high transparency, hence can be used as near-infrared absorbing materials, together with an intermediate thereof. Thus provided are polymethine compounds of the general formula (I): ##STR1## wherein R.sub.1 and R.sub.2 each independently represents a hydrogen atom, an alkyl group or an alkoxy group, R.sub.3 represents an alkyl group, which may optionally be substituted, L represents an alkylene group necessary for the formation of a cyclic structure, X represents a hydrogen atom, a halogen atom or a substituted amino group, and Z represents an acidic residue, as well as near-infrared absorbing materials comprising the same.
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