Patent ID: 8808437

Claim:
A phase change ink comprising: (i) an ink carrier; (ii) a quinacridone pigment; (iii) a synergist: (a) of the formula: (b) of the formula wherein: (1) R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 10 , and R 11 each, independently of the others, is: (A) hydrogen; (B) halogen; (C) alkyl, including substituted and unsubstituted alkyl, wherein hetero atoms either may or may not be present in alkyl; or (D) alkoxy, including substituted and substituted alkoxy, wherein hetero atoms either may or may not be present in alkoxy; (2) R 7 is: (A) alkylene, including substituted and unsubstituted alkylene, wherein hetero atoms either may or may not be present in alkylene; (B) arylene, including substituted and unsubstituted arylene, wherein hetero atoms either may or may not be present in arylene; (C) arylalkylene, including substituted and unsubstituted arylalkylene, wherein hetero atoms either may or may not be present in arylalkylene; or (D) alkyaryene, including substituted and unsubstituted alkylarylene, wherein hetero atoms either may or may not be present in alkylarylene; (3) x is an integer of at least 1; and (4) R 8 is: (A) hydrogen; or (B) —R 9 —(COOH) y , wherein R 9 has the same definition as R 7 and can be either the same as or different from R 7 , and wherein y has the same definition as x, and can be either the same as or different from x; and (iv) a pigment dispersant; said phase change ink being a solid at about 25° C.