Laked monoazo pigments based on naphtholsulfonic acids
View Patent ↗The invention relates to novel monoazo compounds of formula (1), wherein R represents H or Cl, M 2+ represents Ca 2+ or SR 2+ and Y 1 =H and Y 2 =SO 3 − or Y 1 =SO 3 − and Y 2 =H. The compounds of formula (1) are characterized by their high drying power and high light-fastness.
1. A compound of the general formula (1)
where
R is H or Cl,
M 2+ is Ca 2+ or Sr 2+ ,
Y 1 is H and Y 2 is SO 3 − or Y 1 is SO 3 − and Y 2 is H.
2. A compound as claimed in claim 1 , wherein
R is H, M 2+ is Sr 2+ , Y 1 is SO 3 − and Y 2 is H.
3. A compound as claimed in claim 1 , wherein
R is Cl; M 2+ is Sr 2+ , Y 1 is SO 3 − and Y 2 is H.
4. A compound as claimed in claim 1 , wherein
R is Cl; M 2+ is Ca 2+ , Y 1 is SO 3 − and Y 2 is H.
5. A compound as claimed in claim 1 , wherein
R is H; M 2+ is Sr 2+ , Y 1 is H and Y 2 is SO 3 − .
6. A process for preparing a compound as claimed in claim 1 , comprising the steps of diazotizing anthranilic acid or 4-chloroanthranilic acid, coupling the resultant diazonium salt with a naphtholsulfonic acid of the formula (2)
and laking the resultant monoazo compound with a calcium or strontium salt.
7. A pigmented composition comprising the compound as recited in claim 1 , wherein the pigmented composition is selected from the group consisting of macromolecular organic materials, varnishes, paints, printing inks, electrophotographic toners and developers, powders, powder coatings, inks and colored seeds.