1. A method to prepare a flexible, see-through, coextruded, multilayer tubular article comprising
extruding an inner layer of a polyvinylidene difluoride (PVDF) polymer or a polyvinylidene difluoride copolymer;
extruding an intermediate thermoplastic polyurethane (TPU) layer coextruded in tubular form over the inner PVDF layer, and
extruding a polyvinyl chloride polymer, coextruded in tubular form over the outside surface of the intermediate layer and being coextensive therewith, wherein the polyvinyl chloride polymer optionally contains a stabilizer or a plasticizer or mixtures thereof.
2. The method according to claim 1 wherein the TPU is a polyester polyurethane.
3. The method according to claim 1, wherein the optional stabilizer is a organo tin or Ba\u2014Zn compositions.
4. The method according to claim 1, wherein the optional plasticizer is a polyol diester.
5. The method according to claim 1, wherein the article has a maximum permeation rating of 15 gm2day.
6. The method according to claim 1, where in the article has a maximum permeation rating of 7 gm2day.
7. The method according to claim 1, where in the article has a maximum permeation rating of 5 gm2day.
8. The method according to claim 1, wherein the article has a maximum permeation rating of 15 gm2day when the optional stabilizer, plasticizer or mixtures thereof is present.
9. The method according to claim 1, where in the article has a maximum permeation rating of 7 gm2day when the optional stabilizer, plasticizer or mixtures thereof is present.
10. The method according to claim 1, where in the article has a maximum permeation rating of 5 gm2day when the optional stabilizer, plasticizer or mixtures thereof is present.
11. The method according to claim 3, wherein the article has a maximum permeation rating of 15 gm2day.
12. The method according to claim 3, where in the article has a maximum permeation rating of 7 gm2day.
13. The method according to claim 3, where in the article has a maximum permeation rating of 5 gm2day.
14. The method according to claim 4, wherein the article has a maximum permeation rating of 15 gm2day.
15. The method according to claim 4, where in the article has a maximum permeation rating of 7 gm2day.
16. The method according to claim 4, where in the article has a maximum permeation rating of 5 gm2day.
17. A method to prepare a flexible, see-through, coextruded, multilayer tubular article comprising
extruding an inner layer of a polyvinylidene difluoride (PVDF) polymer or a polyvinylidene difluoride copolymer;
extruding an intermediate thermoplastic polyurethane (TPU) layer coextruded in tubular form over the inner PVDF layer, and
extruding a polyvinyl chloride polymer, coextruded in tubular form over the outside surface of the intermediate layer and being coextensive therewith.
18. The method according to claim 17, wherein the article has a maximum permeation rating of 15 gm2day.
19. The method according to claim 17, where in the article has a maximum permeation rating of 7 gm2day.
20. The method according to claim 17, where in the article has a maximum permeation rating of 5 gm2day.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An optical recording medium, comprising:
a substrate,
a reflective layer,
a second dielectric layer,
a recording layer, and
a first dielectric layer,
wherein the reflective layer, the second dielectric layer, the recording layer and the first dielectric layer are disposed over the substrate in this order,
the recording layer comprises a phase-change recording material comprising any one of GeSbSnMn and GeSbSnMnGa, and
the second dielectric layer comprises an oxide of two or more elements of Nb, Si and Ta.
2. The optical recording medium according to claim 1, wherein the optical recording medium comprises an optical transmission layer, the first dielectric layer, the recording layer, the second dielectric layer, the reflective layer and the substrate in this order from the light irradiation side.
3. The optical recording medium according to claim 1, wherein the oxide in the second dielectric layer is composed of any one of Nb2O5 and SiO2, and Ta2O5 and SiO2.
4. The optical recording medium according to claim 3, wherein the component ratio of Nb2O5 or Ta2O5, \u03b1 (mol %) and the component ratio of SiO2, \u03b2 (mol %) satisfy the next equations, 30\u2266\u03b1\u226685 and \u03b2=100\u2212\u03b1.
5. The optical recording medium according to claim 1, wherein the oxide in the second dielectric layer is Nb2O5, SiO2, and Ta2O5.
6. The optical recording medium according to claim 5, wherein the component ratio of Nb2O5, \u03b1\u2032 (mol %), the component ratio of SiO2, \u03b2\u2032 (mol %) and the component ratio of Ta2O5, \u03b3\u2032 (mol %) satisfy the next equation, 30\u2266\u03b1\u2032\u226685, 10\u2266\u03b2\u2032\u226650 and \u03b3\u2032=100\u2212(\u03b1\u2032+\u03b2\u2032).
7. The optical recording medium according to claim 1, wherein the thickness of the second dielectric layer is 3 nm to 15 nm.
8. The optical recording medium according to claim 1, wherein the first dielectric layer comprises ZnS and SiO2 and the ratio of SiO2 is 15 mol % to 40 mol %.
9. The optical recording medium according to claim 1, wherein the reflective layer comprises any one of Ag and Ag alloy.