Patent ID: 8911544

Claim:
A phase change ink composition comprising: an amorphous compound; a crystalline compound; an optional synergist; an optional dispersant; and a white colorant having a volume average particle size of from about 25 nanometers to less than 200 nanometers; wherein the amorphous compound comprises a first ester of tartaric acid of the formula wherein each of R 1 ,R 2 , R 3 , R 4 , and R5 is independently selected from an alkyl group, wherein the alkyl is straight, branched or cyclic, saturated or unsaturated, substituted or unsubstituted, having from about 1 to about 40 carbon atoms, or a substituted or unsubstituted aromatic or heteroaromatic group; and wherein the crystalline compound comprises a second ester of tartaric acid of the formula wherein each of R 6 and R 7 is independently selected from an aryl or a heteroaryl optionally substituted with a lower alkyl group, an alkoxy group, or a combination thereof, and wherein each n is independently selected from an integer from 0 to 3, or wherein the crystalline compound is a compound of the formula