Method for manufacturing a disc-shaped information medium
The present invention provides a method for manufacturing a disc-shaped information medium that has, on a substrate, a printable layer containing at least a base layer and an ink-receiving layer. The method comprises, performing a liquid spread prevention treatment at an outer peripheral region, which is from an outer peripheral end portion of the substrate to an outer peripheral end portion of the ink-receiving layer; and coating an ink-receiving layer coating liquid for forming the ink-receiving layer onto the base layer to form the printable layer.
1 . A method for manufacturing a disc-shaped information medium that has, on a substrate, a printable layer containing at least a base layer and an ink-receiving layer, the method comprising:
performing a liquid spread prevention treatment at an outer peripheral region from an outer peripheral end portion of the substrate to an outer peripheral end portion of the ink-receiving layer; and
coating an ink-receiving layer coating liquid for forming the ink-receiving layer onto the base layer to form the printable layer.
2 . The method for manufacturing a disc-shaped information medium according to claim 1 , further performing the liquid spread prevention treatment at an inner peripheral region from an inner peripheral end portion of the substrate to an inner peripheral end portion of the ink-receiving layer; and
coating the ink-receiving layer coating liquid onto the base layer.
3 . The method for manufacturing a disc-shaped information medium according to claim 1 , wherein the liquid spread prevention treatment is a treatment that involves forming a convex portion on the substrate.
4 . The method for manufacturing a disc-shaped information medium according to claim 1 , wherein the liquid spread prevention treatment is a treatment that involves forming a convex portion wherein the height of the convex portion and the thickness of the ink-receiving layer are substantially the same.
5 . The method for manufacturing a disc-shaped information medium according to claim 1 , wherein the ink-receiving layer coating liquid comprises particles, a binder and a cross-linking agent.
6 . The method for manufacturing a disc-shaped information medium according to claim 5 , wherein the particles are at least one kind of particle selected from the group consisting of vapor-phase-process silica, pseudo-boehmite and aluminum oxide.
7 . The method for manufacturing a disc-shaped information medium according to claim 5 , wherein the binder is polyvinyl alcohol.
8 . The method for manufacturing a disc-shaped information medium according to claim 5 , wherein the cross-linking agent is a boron compound.
9 . The method for manufacturing a disc-shaped information medium according to claim 5 , wherein the ink-receiving layer coating liquid further comprises a mordant.
10 . The method for manufacturing a disc-shaped information medium according to claim 5 , wherein the ink-receiving layer coating liquid comprises at least one of a compound represented by the following formula (1) or a compound represented by the following formula (2):
RO(CH 2 CH 2 O) n H Formula (1)
wherein R represents a saturated hydrocarbon group having from 1 to 12 carbon atoms, an unsaturated hydrocarbon group having from 1 to 12 carbon atoms, a phenyl group or an acyl group; and n represents an integer of from 1 to 3,
RO(CH 2 CH(CH 3 )O) n H Formula (2)
wherein R represents a saturated hydrocarbon group having from 1 to 12 carbon atoms, an unsaturated hydrocarbon group having from 1 to 12 carbon atoms, a phenyl group or an acyl group; and n represents an integer of from 1 to 3.
11 . The method for manufacturing a disc-shaped information medium according to claim 10 , wherein the compound represented by formula (1) and the compound represented by formula (2) are water-soluble.
12 . The method for manufacturing a disc-shaped information medium according to claim 10 , wherein R in formula (1) and formula (2) is a saturated hydrocarbon group having 1 to 4 carbon atoms.