Halogenated anthraquinone and their use as near infrared...

Details Halogenated anthraquinone and their use as near infrared... Halogenated anthraquinone and their use as near infrared...

C - Chemistry, Metallurgy

09

B

260/236.29

C09B 1/32 (2006.01) G11B 7/244 (2006.01)

Patent

CA 1321790

ABSTRACT OF THE DISCLOSURE High-purity 1,4,5,8-tetraanilidoanthraquinones which are substituted at the p-position of at least one of four anilido benzene rings by a halogen atom are good near infrared rays absorbing filters and are prepared from high purity 1,4,5,8-tetrachloroanthraquinone by reaction with a correspondingly substituted aniline or mixture of anilines in the presence of a salt of an aliphatic carboxylic acid, a benzyl alcohol deriva- tive and copper ions as reaction catalyst.

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