Patent ID: 8602523

Claim:
An ink jet printhead comprising a plurality of channels, wherein the channels are capable of being filled with ink from an ink supply and wherein the channels terminate in nozzles on one surface of the printhead, the surface being coated with a coating composition comprising a fluorinated poly(amide-imide) copolymer, wherein the fluorinated poly(amide-imide) copolymer is a poly(amide-imide)/fluorinated polyether copolymer of the formula or mixtures thereof; wherein: (i) R 1 is: (A) an arylene group, including substituted and unsubstituted arylene groups, wherein hetero atoms either may or may not be present in the arylene group; (B) an arylalkylene group, including substituted and unsubstituted arylalkylene groups, wherein hetero atoms either may or may not be present in either or both of the alkyl portion and the aryl portion of the arylalkylene group; or (C) an alkylarylene group, including substituted and unsubstituted alkylarylene groups, wherein hetero atoms either may or may not be present in either or both of the alkyl portion and the aryl portion of the alkylarylene group; (ii) R 2 is: (A) an alkylene group, including substituted and unsubstituted alkylene groups, wherein hetero atoms either may or may not be present in the alkylene group; (B) an arylene group, including substituted and unsubstituted arylene groups, wherein hetero atoms either may or may not be present in the arylene group; (C) an arylalkylene group, including substituted and unsubstituted arylalkylene groups, wherein hetero atoms either may or may not be present in either or both of the alkyl portion and the aryl portion of the arylalkylene group; or (D) an alkylarylene group, including substituted and unsubstituted alkylarylene groups, wherein hetero atoms either may or may not be present in either or both of the alkyl portion and the aryl portion of the alkylarylene group; (iii) R 3 is: (A) an arylene group, including substituted and unsubstituted arylene groups, wherein hetero atoms either may or may not be present in the arylene group; (B) an arylalkylene group, including substituted and unsubstituted arylalkylene groups, wherein hetero atoms either may or may not be present in either or both of the alkyl portion and the aryl portion of the arylalkylene group; or (C) an alkylarylene group, including substituted and unsubstituted alkylarylene groups, wherein hetero atoms either may or may not be present in either or both of the alkyl portion and the aryl portion of the alkylarylene group; (iv) “fluorinated ether” represents one or more partially fluorinated or fully fluorinated ether monomers; (v) x is a positive integer representing the number of repeat poly(amide-imide) units; and (vi) y is a positive integer representing the number of repeat fluorinated ether units.