Azo pigment compositions and process for their preparation
AssigneeHoechst Celanese Corporation
InventorsJoseph Kammer, Richard Fischer
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Abstract
This invention is that of an azo pigment composition containing about 1 to 10 percent by weight of a nonionic alkyl polyglycoside dispersing agent. The polyglycosides useful in the invention have the general formulae: C.sub.n H.sub.2n+1 M (C.sub.6 H.sub.10 O.sub.5).sub.x H wherein: M is an oxygen, sulfur, nitrogen phosphorous or silicon atom; n is an integer from 8 to 18, preferably 8 to 11 and X represents the number average degree of polymerization having a numerical value from about 1 to about 2. These azo pigment compositions are prepared by conducting the azo pigment coupling reaction in the presence of said alkyl polyglycoside. The resulting pigment exhibit superior application properties in water based ink systems.
Claims15
An azo pigment composition comprising an azo pigment selected from the monoazo and disazo pigments and from about 1 to 10 percent by weight of an alkyl polyglycoside of the formula:
- C.sub.n H.sub.2n+1 M(C.sub.6 H.sub.10 O.sub.5).sub.x H
- wherein:
- x is a number having a value from about 1 to about 2;
- n is an integer from about 8 to about 18;
- and
- M is a moiety selected from O, S, N, P and Si.
A process for preparing an azo pigment which comprises coupling a diazotized amine with a coupling component selected from a substituted or unsubstituted arylide, naphthol or pyrazolone in the presence of 1 to 10 percent by weight of pigment produced of an alkyl polyglycoside of the formula:
- C.sub.n H.sub.2n+1 M(C.sub.6 H.sub.10 O.sub.5).sub.x H
- wherein:
- x is a number having a value from about 1 to about 2;
- n is an integer from about 8 to about 18;
- and
- M is a moiety selected from O, S, N, P and Si.
A water based ink composition comprising a aqueous binder solution and an azo pigment selected from the monoazo and disazo pigments and from about 1 to 10 percent by weight of an alkyl polyglycoside of the formula:
- C.sub.n H.sub.2n+1 M(C.sub.6 H.sub.10 O.sub.5).sub.x H
- wherein:
- x is a number having a value from about 1 to about 2;
- n is an integer from about 8 to about 18;
- and
- M is a moiety selected from O, S, N, P and Si.
Dependencies are inferred from the claim text.