Process for preparing 1-cyano-3H-dibenz[f,ij] isoquinoline-2,7-diones and their use as toners for polyesters
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United States of America Patent
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Oct 12, 1993
Grant Date -
N/A
app pub date -
May 15, 1992
filing date -
May 15, 1992
priority date (Note) -
Expired
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Abstract
Provided is an improved process for the synthesis of 1-cyano-3H-dibenz[f,ij] isoquinoline-2,7-dione compounds, and process exhibiting improvements in quality of products, safety, fewer environmental concerns and economics when compared to presently known processes. The compounds are useful as colorants for polyesters, and selected compounds and when combined with small quantities of certain red colorants are particularly efficacious as blue toners for polyesters.
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