Recording sheet with ink receptive layer and coating liquid for forming ink receptive layer
View Patent ↗A recording sheet with an ink-receptive layer which can be used not only for dye type inks but also for pigment type inks is provided. Also provided is a coating liquid for forming an ink-receptive layer. The recording sheet with an ink-receptive layer includes a substrate sheet and an ink-receptive layer formed thereon, wherein the ink-receptive layer includes (i) fibrous crystalline particles on surfaces of which a cationic hydrated metal compound is supported and (ii) a binder. The fibrous crystalline particles have an average fiber diameter (D) of 0.1 to 2 μm, an average fiber length (L) of 1 to 200 μm and a ratio (aspect ratio) of an average fiber length (L) to an average fiber diameter (D) of 5 to 500.
1. A recording sheet with an ink-receptive layer, comprising a substrate sheet and an ink-receptive layer formed thereon, wherein the ink-receptive layer comprises:
(i) fibrous crystalline particles on surfaces of which a cationic hydrated metal compound is supported, wherein the fibrous crystalline particles have an average fiber diameter (D) of 0.1 to 2 μm, an average fiber length (L) of 1 to 200 μm, and a ratio (aspect ratio) of an average fiber length (L) to an average fiber diameter (D) of 5 to 500, and
(ii) a binder,
wherein the fibrous crystalline particles are particles of at least one substance selected from the group consisting of basic magnesium sulfate, basic calcium sulfate, basic barium sulfate, and basic strontium sulfate.
2. The recording sheet with an ink-receptive layer as claimed in claim 1 , wherein the cationic hydrated metal compound is a compound represented by the following formula (1) or a compound obtained from a metal salt represented by the following formula (2):
[M 2 (OH) n X (2a-n)/b ] m (1)
[MX a/b ] m (2)
wherein M is a trivalent or higher metallic cation, X is an anion, a is a valence of the metallic cation, b is a valence of the anion, and n and m are numbers satisfying the conditions of 1<n<5, n<2a and 1≦m.
3. The recording sheet with an ink-receptive layer as claimed in claim 2 , wherein M of the cationic hydrated metal compound is Al 3+ .
4. The recording sheet with an ink-receptive layer as claimed in claim 1 , which further comprises inorganic fine particles.
5. The recording sheet with an ink-receptive layer as claimed in claim 4 , wherein the inorganic fine particles are one or more substances selected from an alumina sol, an alumina gel, a silica sol, a silica gel, a silica-alumina sol, a silica-alumina gel, a zirconia sol, a zirconia gel and a clay mineral.
6. The recording sheet with an ink-receptive layer as claimed in claim 5 , wherein the inorganic fine particles are an alumina sol and/or an alumina gel each of which is pseudo-boehmite alumina.
7. The recording sheet with an ink-receptive layer as claimed in claim 1 , wherein the ink-receptive layer has pores having pore diameters of 30 to 2000 nm, and a pore volume of the pores having pore diameters of 30 to 2000 nm is in the range of 0.15 to 2.0 ml/g.
8. The recording sheet with an ink-receptive layer as claimed in claim 2 , which further comprises inorganic fine particles.
9. The recording sheet with an ink-receptive layer as claimed in claim 3 , which further comprises inorganic fine particles.
10. The recording sheet with an ink-receptive layer as claimed in claim 2 , wherein the ink-receptive layer has pores having pore diameters of 30 to 2000 nm, and a pore volume of the pores having pore diameters of 30 to 2000 nm is in the range of 0.15 to 2.0 ml/g.
11. The recording sheet with an ink-receptive layer as claimed in claim 4 , wherein the ink-receptive layer has pores having pore diameters of 30 to 2000 nm, and a pore volume of the pores having pore diameters of 30 to 2000 nm is in the range of 0.15 to 2.0 ml/g.
12. The recording sheet with an ink-receptive layer as claimed in claim 1 , wherein the fibrous crystalline particles are particles of basic magnesium sulfate.