Pigmented 1-naphtholsulphonic acid-based monoazo pigments
View Patent ↗The invention relates to novel monoazo compounds of formula (1), wherein R 1 re resents H, Cl or CH 3 ; R 2 represents H or Cl; M 2+ represents Mg 2+ , Mn 2+ or Sr 2+ ; Y 1 =represents COO − or SO 3 − ; Y 2 =SO 3 − ; Y 3 =Y 4 =Y 5 =H; or Y 3 =SO 3 31 , Y 2 =Y 4 =Y 5 =H; or Y 4 =SO 3 − , Y 2 =Y 3 =Y 5 =H; or Y 5 =SO 3 − , Y 2 =Y 3 =Y 4 =H. The compounds of formula (1) are characterized by high intensity and light-fastness.
1. A compound of the general formula (1)
where
R 1 is H, Cl or CH 3,
R 2 is H or Cl,
M 2+ is Mg 2+ Mn 2+ or Sr 2+ ,
Y 1 =COO − or SO 3 − , and
Y 2 =SO 3 − , Y 3 =Y 4 =Y 5 =H; or Y 3 =SO 3 − , Y 2 =Y 4 =Y 5 =H; or
Y 4 =SO 3 − , Y 2 =Y 3 =Y 5 =H; or Y 5 =SO 3 − , Y 2 =Y 3 =Y 4 =H.
2. A compound as claimed in claim 1 , wherein
R 1 =Cl, R 2 =H, M 2+ =Sr 2+ , Y 1 =COO − and Y 2 =Y 3 =Y 5 =H, Y 4 =SO 3 − .
3. A compound as claimed in claim 1 , wherein R 1 =Cl, R 2 =H, M 2+ =Mn 2+ , Y 1 =COO − and Y 2 =Y 3 =Y 4 =H, Y 5 =SO 3 31 .
4. A compound as claimed in claim 1 , wherein
R 1 =H, R 2 =H, M 2+ =Sr 2+ , Y 1 =COO − and Y 3 =Y 4 =Y 5 =H, Y 2 =SO 3 − .
5. A compound as claimed in claim 1 , wherein R 1 =CH 3 , R 2 =Cl, M 2+ =Mg 2+ , Y 1 =SO 3 − and Y 2 =Y 4 =Y 5 =H, Y 3 =SO 3 − .
6. A process for preparing a compound as claimed in claim 1 , comprising the steps of diazotizing an amine o the general formula (2), coupling the resultant diazonium salt with a naphtholsulfonic acid of the general formula (3) and laking the resultant monoazo compound with a magnesium, strontium or manganese salt.
7. A pigmented composition comprising a compound as claimed in claim 1 , wherein the composition is selected from the group consisting of macromolecular organic materials, varnishes, paints, printing inks, electrophotographic toners, electrophotographic developers, powders, powder coatings and inks.
8. A colored seed comprising a compound as claimed in claim 1 .