Patent ID: 7182433
Filing Date: 2007-02-27
Classification: B41J

Abstract:
1. 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 crosslinked resin formed from a polymerizable composition comprising a fluorine-containing polymerizable polymer, and the fluorine-containing polymerizable polymer comprises: a first structural unit having a fluorine atom; and a second structural unit having a radical-polymerizable group, wherein the crosslinked resin is formed from the polymerizable composition through a crosslinking reaction, the crosslinking reaction comprising a radical polymerization, wherein the first structural unit having the fluorine atom is a structural unit represented by one of formulae 1a, 1b, 1c and 1d; and the second structural unit having the radical-polymerizable group is a structural unit represented by formula 2: wherein Rf R R R wherein, R wherein the fluorine-containing polymerizable polymer comprises: a first segment which is a polymer chain comprising the first structural unit having the fluorine atom; and a second segment which is a polymer chain comprising the second structural unit having the radical-polymerizable group, wherein the fluorine-containing polymerizable polymer is one of: a linear polymer comprising the first segment and the second segment; and a branched polymer comprising the first segment and the second segment, wherein the nozzle has an underlying surface coated by the polymerizable composition, wherein the underlying surface has a surface irregularity based on JIS B0601-1994 such that: an arithmetical mean roughness (Ra) is not more than 0.5 μm; a ratio (Ra/Rz) of the arithmetical mean roughness (Ra) to a ten-point mean roughness (Rz) is 0.1 or more; a maximum height (Ry) is not more than 0.5 μm; and a mean space of the surface irregularity (Sm) is from 0.005 to 1 μm.