Storage medium for data with improved dimensional stability
View Patent ↗This disclosure relates to a data storage medium, and in particular to a data storage medium comprising at least one high modulus layer used to control the overall degree of flatness in the storage medium.
1. An asymmetric optical storage medium comprising a plurality of layers, said plurality of layers including a substrate layer, a data layer, and at least one high modulus layer which improves dimensional stability in said medium, said high modulus layer comprising a cured high modulus organic polymer having a tensile modulus of at least 1 gigapascal.
2. The optical storage medium of claim 1 , wherein said high modulus layer comprises a material cured using ultra-violet light.
3. The optical storage medium of claim 2 , wherein said material comprises at least one member selected from the group consisting of an acrylate, an epoxy, a silicone-acrylate, a urethane, and any combination thereof.
4. The optical storage medium of claim 1 , wherein said high modulus layer comprises a thermally cured material.
5. The optical storage medium of claim 4 , wherein said material comprises at least one member selected from the group consisting of a silicone hardcoat, silica with hydrolizable silanes, an epoxy, a urethane, an imide, a siloxane and any combination thereof.
6. The optical storage medium of claim 3 , wherein said acrylate is at least one member selected from the group consisting of a poly-methylmethacrylate, a methyl methacrylate-polyimide copolymer, a methyl methacrylate-silicone copolymer, and any combination thereof.
7. The optical storage medium of claim 1 , wherein said high modulus layer is in direct contact with a data layer.
8. The optical storage medium of claim 1 , wherein said high modulus layer is in direct contact with a film layer.
9. The optical storage medium of claim 1 , wherein the thickness of said high modulus layer is between about 0.01 micrometers (μm) and about 50 micrometers (μm).
10. The optical storage medium of claim 1 , wherein said high modulus layer has a modulus that is greater or equal to the modulus of the substrate layer.
11. An asymmetric optical storage medium comprising the following layers:
at least one substrate layer;
at least one data layer which is in direct contact with said substrate layer;
at least one high modulus layer which in direct contact with said data layer, said high modulus layer comprising a cured high modulus organic polymer having a tensile modulus of at least 1 gigapascal; and
at least one thin film layer which is in direct contact with said high modulus layer.
12. The optical storage medium of claim 11 , wherein said substrate layer is a polymeric material comprising at least one member selected from the group consisting of a thermoplastic, a thermoset, and any combination thereof.
13. The optical storage medium of claim 12 , wherein said thermoplastic is one member selected from the group consisting of a polyester, a polycarbonate, a polystyrene, a polymethylmethacrylate, a polyketone, a polyamide, an aromatic polyether, a polyether-sulfone, a polyether-imide, a polyether ketone, a polyphenylene ether, a polyphenylene sulfide, and any combinations thereof.
14. The optical storage medium of claim 11 , wherein said data layer comprises at least one member selected from the group consisting of a thermoplastic, a thermoset, and any combination thereof.
15. The optical storage medium of claim 11 , wherein said high modulus layer further comprises at least one member selected from the group consisting of a thermoplastic, a thermoset, and any combination thereof.
16. The optical storage medium of claim 11 , wherein said thin film layer comprises at least one member selected from the group consisting of a homopolymer, a copolymer, a thermoplastic, a thermoset, and any mixtures thereof.
17. The optical storage medium of claim 16 , wherein said thermoset is spin coated.
18. A method for decreasing the tilt of an asymmetric optical storage medium, said method comprising an addition step wherein a high modulus layer is added to the optical storage medium so that the dimensional stability of said medium is increased, said high modulus layer comprising a cured high modulus organic polymer having a tensile modulus of at least 1 gigapascal.
19. The method of claim 18 , wherein said optical storage medium comprises:
at least one substrate layer;
at least one data layer which is in direct contact with said substrate layer;
at least one high modulus layer which in direct contact with said data layer, and
at least one thin film layer which is in direct contact with said high modulus layer.