Compositions – Light transmission modifying compositions – Infrared
Patent
1989-03-28
1990-05-08
Lee, Mary C.
Compositions
Light transmission modifying compositions
Infrared
430345, 350354, 564123, F15V 904
Patent
active
049236385
ABSTRACT:
A near infrared absorbing composition is disclosed, containing at least one compound represented by general formula (I), having its absorption maxima at wavelengths of 720 nm or more: ##STR1## wherein R.sup.1 represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group; R.sup.2 and R.sup.5, which may be the same or different, each represents a hydrogen atom or a group capable of substituting a hydrogen atom; R.sup.3 and R.sup.4, which may be the same or different, each represents a hydrogen atom, a halogen atom, a substituted or unsubstituted alkoxy group or a substituted or unsubstituted alkyl group with the proviso that they do not simultaneously represent hydrogen atoms; and R.sup.6 and R.sup.7, which may be the same or different, each represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, an acyl group or a sulfonyl group, or R.sup.6 and R.sup.7 may be taken together to form a 5- or 6-membered ring.
REFERENCES:
patent: 3806462 (1974-04-01), Bloom
patent: 3843370 (1974-10-01), Waxman et al.
patent: 4042394 (1977-08-01), Smith, Jr. et al.
patent: 4307165 (1981-12-01), Blazey et al.
patent: 4386145 (1983-05-01), Gilmour
patent: 4508655 (1985-04-01), Sasagawa et al.
Adachi Keiichi
Hayashi Gouichi
Mihara Yuji
Ohno Shigeru
Ukai Toshinao
Fuji Photo Film Co. , Ltd.
Kilby Scalzo Catherine S.
Lee Mary C.
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