Patent ID: 7210763

Claim:
An inkjet recording head, which comprises a nozzle having: a hole for discharging a recording liquid including an ink; and a portion capable of repelling the ink at the periphery of the hole, wherein the portion comprises a cured film formed from a composition comprising a block copolymer, and the block copolymer is at least one of: a block copolymer comprising a unit A and a unit B; a block copolymer comprising the unit A, the unit B and the unit A in this order; and a comb block copolymer comprising the unit A as a main chain and the unit B as a side chain, wherein the unit A represents a block polymer (A) comprising a fluorine-containing polymer and a siloxane-containing polymer that comprises at least one of a group represented by formula (SI) and a group represented by formula (SII): wherein R 11 , R 12 , R 13 , R 14 and R 15 are the same or different and each represents an aliphatic group or an aromatic group; and the unit B represents a block polymer (B) comprising a polyester polymer, wherein the fluorine-containing polymer comprises at least one of a polymeric unit represented by formula (FI), a polymeric unit represented by formula (FII) and a polymeric unit represented by formula (FIII): wherein R 0 represents a perfluoroalkyl group having from 1 to 8 carbon atoms, or an —OR f 1 group; and the R f 1 group represents a fluorine-containing aliphatic group having from 1 to 30 carbon atoms, wherein R 1 and R 2 are the same or different and each represents a fluorine atom or a —C v F 2v+1 group; v represents an integer of from 1 to 4; a represents 0 or 1; b represents an integer of from 2 to 5; and c represents 0 or 1, and wherein R 3 and R 4 each represents a fluorine atom or a —CF 3 group; a represents the same as in formula (FII); d represents 0 or 1; k represents an integer of from 0 to 5; 1 represents an integer of from 0 to 4; m represents 0 or 1; and (k+1+m) represents an integer in the range of from 1 to 6.