Process for preparing orange polymeric colorants

Details Process for preparing orange polymeric colorants Process for preparing orange polymeric colorants

1978-10-30

1981-03-24

Daus, Donald G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

260 458N, 426250, 426540, 426590, 525336, 525375, 525403, C07D22115, C09B 542

Patent

active

042581893

ABSTRACT:
A process for preparing a family of orange polymeric colorants having a plurality of units of the chromophore ##STR1## is disclosed. R.sub.1 and R.sub.2 are hydrogens, lower alkyls or alkoxies, nitros, halos or sulfonates, R.sub.3 is benzyl, benzyl sulfonate, lower alkyl or alkyl sulfonate, R.sub.4 is hydrogen or lower alkyl. With the disclosed process, the chromophore units, less the R.sub.3 substituent, are bonded to an organic polymer backbone. The R.sub.3 substituent is added thereafter in a separate second step.

REFERENCES:
patent: 3943136 (1976-03-01), Ribaldone
patent: 4107336 (1978-08-01), Oheson et al.

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