Patent ID: 7629097

Claim:
An electrostatographic toner comprising a core material comprising an amorphous glass composition comprising a mixture of at least two nonpolymeric compounds each independently corresponding to the structure (R 1 Y 1 ) p [(Z 1 Y 2 ) m R 2 Y 3 ] n Z 2 Y 4 R 3 wherein m is zero or one; n is the number of recurring units in the compound, and is zero up to, but not including, an integer at which said compound starts to become a polymer; p is an integer of from one to eight; each R 1 and R 3 is independently a monovalent aliphatic or cycloaliphatic hydrocarbon group having up to 20 carbon atoms, an aromatic group or a multicyclic aromatic nucleus; R 2 , Z 1 and Z 2 each independently represent multivalent aliphatic or cycloaliphatic hydrocarbon groups having up to 20 carbon atoms or an aromatic group; Y 1 , Y 2 , Y 3 and Y 4 each independently represents one or more linking groups such as esters (—COO—), amides (—CONH—), urethanes (—NHCOO—), imides wherein R 1 represents alkyl of 1-6 carbon atoms, hydroxyl, amino or aryl, and 1,3,4-oxadiazol-2,5-ylenes wherein the glass transition temperature of the at least two nonpolymeric compounds is from 50 to 120° C.; and a shell comprising an amorphous matrix, having a glass transition temperature (Tg) of greater than about 50° C.