Liquid ejection head and method for producing liquid ejection head

A method for producing a liquid ejection head, wherein

• the liquid ejection head comprising a cured product of a liquid-repellent coating material,
• the coating material comprising:
• a condensation product of a silane mixture comprising
• a hydrolyzable silane compound (a) having a perfluoropolyether group and a cyclic polyorganosiloxane group and represented by formula (1) below and
• a hydrolyzable silane compound (b) having an epoxy group, wherein
• the liquid ejection head comprises a cured product of a photopolymerizable resin comprising a photopolymerization initiator, and
• the cured product of the liquid-repellent coating material is formed on the cured product of the photopolymerizable resin, wherein
• the method comprising:
• (1) applying a photopolymerizable resin mixture comprising an epoxy compound other than the hydrolyzable silane compound (b) capable of forming the photopolymerizable resin and the photopolymerization initiator to a substrate and drying the photopolymerizable resin mixture to form a photopolymerizable resin layer;
• (2) applying the coating material to the photopolymerizable resin layer to form a coating film of the coating material;
• (3) simultaneously exposing and developing the photopolymerizable resin layer and the coating film;
• and
• (4) after the exposure and the development, collectively curing the photopolymerizable resin layer and the coating film;
• in the formula (1), p is an integer of 1 or more, q is an integer of 1 or more, p+q is 4 or more, and an arrangement of a structure of a parenthesis with p and a structure of a parenthesis with q may be block or random;
• Xas represent alkyl groups;
• Xbs represent alkyl groups;
• Rps are perfluoropolyether groups represented by formula (2) below;
• Ys are structures having hydrolyzable silyl groups represented by formula (3) below;
• in the formula (2), r is 20 to 30, and s is 20 to 30;
• an arrangement of a structure of a parenthesis with r and a structure of a parenthesis with s may be block or random;
• and A represents an organic group;
• in the formula (3), c is an integer of 3 or less, B is a C1-12 organic group, Qs are hydrolyzable substituents, and R5 are non-hydrolyzable substituents.

A method for producing a liquid ejection head, wherein

• the liquid ejection head comprising a cured product of a liquid-repellent coating material,
• the coating material comprising:
• a condensation product of a silane mixture comprising
• a hydrolyzable silane compound (a) having a perfluoropolyether group and a cyclic polyorganosiloxane group and represented by formula (1) below and
• a hydrolyzable silane compound (b) having an epoxy group, wherein
• the coating material further comprises a photopolymerizable resin and a photopolymerization initiator, wherein
• the method comprising:
• (1) applying the coating material comprising
• the condensation product of the silane mixture,
• the photopolymerization initiator, and
• an epoxy compound other than the hydrolyzable silane compound (b) capable of forming the photopolymerizable resin
• to a substrate to form a coating film of the coating material;
• (2) exposing and developing the coating film of the coating material;
• and
• (3) after the exposure and the development, curing the coating film to form the cured product of the coating material;
• in the formula (1), p is an integer of 1 or more, q is an integer of 1 or more, p+q is 4 or more, and an arrangement of a structure of a parenthesis with p and a structure of a parenthesis with q may be block or random;
• Xas represent alkyl groups;
• Xbs represent alkyl groups;
• Rps are perfluoropolyether groups represented by formula (2) below;
• Ys are structures having hydrolyzable silyl groups represented by formula (3) below;
• in the formula (2), r is 20 to 30, and s is 20 to 30;
• an arrangement of a structure of a parenthesis with r and a structure of a parenthesis with s may be block or random;
• and A represents an organic group;
• in the formula (3), c is an integer of 3 or less, B is a C1-12 organic group, Qs are hydrolyzable substituents, and R5 are non-hydrolyzable substituents.