Low molecular weight pigment dispersants for phase change ink
View Patent ↗Disclosed is a compound of the formula or a mixture thereof; wherein R and R′ are the same or different, and wherein R and R′ are independently selected from an alkyl group, an arylalkyl group, or an alkylaryl group, wherein the alkyl group, the arylalkyl group, or the alkylaryl group has from about 18 to about 60 carbon atoms; and wherein m is an integer of from about 1 to about 30.
1. A compound of the formula
or a mixture thereof;
wherein R and R′ are the same or different, and wherein R and R′ are independently selected from a linear alkyl group having about 37 carbon atoms and a linear alkyl group having about 47 carbon atoms;
and wherein m is an integer of from about 1 to about 30.
2. The compound of claim 1 , having the formula
wherein n has an average value of about 46.
3. The compound of claim 1 , having the formula
wherein n has an average value of about 46.
4. The compound of claim 1 , having the formula
wherein n has an average value of about 46.
5. The compound of claim 1 , having the formula
wherein n has an average value of about 46.
6. The compound of claim 1 , having the formula
where n has an average value of about 46 and m is about 6.
7. The compound of claim 1 , having the formula
wherein n has an average value of about 46 and m is about 6.
8. The compound of claim 1 , having the formula
wherein n has an average value of about 46 and m is about 9.
9. The compound of claim 1 , having the formula
wherein n has an average value of about 46 and m is about 9.
10. The compound of claim 1 , having the formula
where n has an average value of about 46 and m is about 14.
11. The compound of claim 1 , having the formula
wherein n has an average value of about 46 and m is about 14.
12. The compound of claim 1 , having the formula
wherein n has an average value of about 36 and m is about 9.
13. A compound having the formula
wherein n has an average value of about 28 and m is about 9.
14. A compound having the formula
wherein n has an average value of about 20 and m is about 9.
15. The compound of claim 1 , comprising a mixture of compounds of the formula
wherein n has an average value of 46 carbons and m is about 4.
16. The compound of claim 1 , comprising a mixture of compounds of the formula
wherein n has an average value of 46 carbons and m is about 6.
17. A method for preparing a compound comprising:
melting a carboxylic acid of the formula
wherein R is (i) an alkyl group, which may be linear or branched, cyclic or acyclic, substituted or unsubstituted, and wherein hetero atoms either may or may not be present in the alkyl group,
(ii) an arylalkyl group, which may be substituted or unsubstituted, wherein the alkyl portion of the arylalkyl group can be linear or branched, cyclic or acyclic, substituted or unsubstituted, and wherein hetero atoms either may or may not be present in either the aryl or the alkyl portion of the arylalkyl group, or
(iii) an alkylaryl group, which may be substituted or unsubstituted, wherein the alkyl portion of the alkylaryl group can be linear or branched, cyclic or acyclic, substituted or unsubstituted, and wherein hetero atoms either may or may not be present in either the aryl or the alkyl portion of the alkylaryl group; under an inert atmosphere;
wherein the alkyl group, the arylalkyl group, or the alkylaryl group has from about 18 to about 60 carbon atoms; and
reacting an amine compound of the formula
wherein m is an integer of from about 1 to about 30,
with the melted carboxylic acid, under an inert atmosphere and at an elevated temperature of about 170 to about 200° C.;
wherein the carboxylic acid and the amine are provided in a 2:1 ratio of carboxylic acid to amine, to provide a product of the formula
wherein the carboxylic acid and the amine are provided in a 1:1 ratio of carboxylic acid to amine, to provide a product of the formula
wherein the carboxylic acid and the amine are provided in a 1.5:1 ratio of carboxylic acid to amine, to provide a product comprising a mixture of the formula