Ink jet recording sheet
View Patent ↗The present invention provides ink jet recording sheets comprising a colorant receiving layer on a substrate, the colorant receiving layer comprising fine particles, a water soluble resin, and a cationic resin including a unit represented by the following formula (1): Formula (1) wherein, R represents a hydrogen atom or a methyl group; Y represents a divalent linking group; R 1 represents an optionally substituted aralkyl or aryl group; R 2 and R 3 each independently represents an optionally substituted alkyl, aralkyl or aryl group having 1 to 18 carbon atoms; R 4 represents an optionally substituted alkylene, aralkylene or arylene group; Q is at least one unit provided from a monomer having an ethylenic double bond, and represents a unit having an inorganic/organic ratio (I/O value) of less than 1 in the organic conceptional chart; X − represents an anion; m represents 20 to 100% by mole; and n represents 0 to 80% by mol.
1. An ink jet recording sheet comprising a colorant receiving layer disposed on a substrate, wherein the colorant receiving layer comprises fine particles, a water soluble resin, and a cationic resin including a unit represented by the following formula (1) and a cationic resin including a unit represented by the following formula (2):
wherein in the formula (1), R represents a hydrogen atom or a methyl group; Y represents a divalent linking group; R 1 represents an optionally substituted aralkyl or aryl group; R 2 and R 3 each independently represent an optionally substituted alkyl, aralkyl or aryl group having 1 to 18 carbon atoms; R 4 represents an optionally substituted alkylene, aralkylene or arylene group; Q is at least one unit provided from a monomer having an ethylenic double bond, and represents a unit having an inorganic/organic ratio (I/O value) of less than 1 in an organic conceptional chart; X − represents an anion; m represents 20 to 100% by mole; and n represents 0 to 80% by mole; and
in the formula (2), R represents a hydrogen atom or a methyl group; Y represents a divalent linking group; R 5 , R 6 and R 7 each independently represent an optionally substituted alkyl group having 1 to 18 carbon atoms; R 8 represents an optionally substituted alkylene, aralkylene or arylene group; Z is at least one unit provided from an aromatic group-containing monomer having an ethylenic double bond, and represents a unit having less than 0.5 of an inorganic/organic ratio (I/O value) in the organic conceptional chart; X − represents an anion; p represents 20 to 80% by mole; and q represents 20 to 80% by mole,
wherein the monomer that provides the unit represented by Q in the formula (1) is styrene or vinyl toluene, the monomer that provides the unit represented by Z in the formula (2) is styrene or vinyl toluene, the I/O value of the cationic resin represented by the formula (1) is not more than 2 with a cation equivalent of at least 1.5 meq/g or more and no more than 4 meq/g, and the I/O value of the cationic resin represented by formula (2) is not more than 2 with a cation equivalent of at least 1.5 meq/g or more and no more than 4 meq/g; and
wherein the unit Q in the formula (1) represents a vinyl toluene.
2. An ink jet recording sheet according to claim 1 , wherein the fine particles are at least one selected from silica fine particles, colloidal silica, alumina fine particles and pseudo-boehmite.
3. An ink jet recording sheet according to claim 1 , wherein the water soluble resin is at least one selected from polyvinyl alcohol resins, cellulose resins, resins having ether bonds, resins having carbamoyl groups, resins having carboxyl groups and gelatin.
4. An ink jet recording sheet according to claim 1 , wherein the colorant receiving layer comprises a cross-linking agent capable of cross-linking the water soluble resin.
5. An ink jet recording sheet according to claim 1 , wherein the colorant receiving layer further comprises a dye mordant.
6. An ink-jet recording sheet according to claim 1 , wherein the colorant receiving layer is obtained by crosslinking a coated layer prepared by coating the substrate with a coating liquid containing at least the fine particles, the water soluble resin, and a cationic resin including a unit represented by the formula (1) and optionally a cationic resin including a unit represented by the formula (2), and
the coated layer is hardened by cross-linking by adding a cross-linking agent to at least one of the coating liquid and a basic solution having a pH value of at least 8, and by applying the basic solution to the coated layer (1) at the same time as when the coated layer is formed by applying the coating liquid or (2) during the process for drying the coated layer formed by applying the coating liquid, and before the coated layer exhibits a falling rate of drying.
7. An ink jet recording sheet according to claim 1 , wherein Y represents —O— or —NR′—, in which R′ represents hydrogen or an alkyl group.
8. An ink jet recording sheet according to claim 1 , wherein m in formula (1) represents 30 to 70% by mole, and n in formula (1) represents 30 to 70% by mole.
9. An ink jet recording sheet according to claim 1 , wherein p in formula (2) represents 30 to 70% by mole, and q in formula (2) represents 30 to 70% by mole.
10. An ink jet recording sheet according to claim 1 , wherein the weight average molecular weight of the cationic resin is in the range of from 2,000 to 100,000.
11. An ink jet recording sheet according to claim 1 , wherein the total content of the cationic resins is in the range of from 0.1 to 3 g/m 2 .