Optical data carrier comprising a phthalocyanine dye as light-absorbent compound in the information layer
View Patent ↗The invention relates to an optical data carrier having a preferably transparent substrate that has optionally previously been coated with one or more reflection layers and to the surface of which has been applied a light-writeable information layer, optionally one or more reflection layers, and optionally a protective layer or a further substrate or a covering layer, such that the optical data carrier can be written on or read by means of blue light (preferably laser light having a specified wavelength) or by means of infrared light (preferably laser light having a specified wavelength), wherein the information layer contains (i) light-absorbent phthalocyanine dyes of the formula (I) where Me is a doubly axially substituted Si, Ge, and Sn atom, Pc is an unsubstituted phthalocyanine, and X 1 and X 2 are each independently halogen, and (ii) optionally, a binder.
1. An optical data carrier comprising a substrate that optionally has previously been coated with one or more reflection layers and to the surface of which has been applied a light-writeable information layer, optionally one or more reflection layers, and optionally a protective layer or a further substrate or a covering layer, such that the optical data carrier can be written on or read by means of blue light, wherein the information layer comprises
(i) a light-absorbent compound comprising at least one phthalocyanine dye of the formula (I)
where
Me is a doubly axially substituted metal atom selected from the group consisting of Si, Ge, and Sn,
Pc is an unsubstituted phthalocyanine, and
X 1 and X 2 are each, independently of one another, halogen.
2. An optical data carrier according to claim 1 wherein the substrate is transparent.
3. An optical data carrier according to claim 1 wherein the blue light is a blue laser light.
4. An optical data carrier according to claim 1 wherein the blue light has a wavelength of 360 to 460 nm.
5. An optical data carrier according to claim 1 wherein the radicals X 1 and X 2 are each chlorine.
6. An optical data carrier according to claim 1 wherein the light-absorbent compound corresponds to at least one phthalocyanine of the formula (Ia), (Ib), (Ic), or (Id)
7. A light-absorbent compound for use in an information layer of optical storage media comprising a phthalocyanine of the formula (I)
where
Me is a doubly axially substituted metal atom selected from the group consisting of Si, Ge, and Sn,
Pc is an unsubstituted phthalocyanine, and
X 1 and X 2 are each, independently of one another, halogen.
8. A light-absorbent compound according to claim 7 comprising more than 90% by weight of a phthalocyanine of the formula (I), based on the total light-absorbent compound.
9. A method of producing optical storage media comprising applying to a substrate a light-writeable information layer containing a light-absorbent compound comprising a phthalocyanine
where
Me is a doubly axially substituted metal atom selected from the group consisting of Si, Ge, and Sn,
Pc is an unsubstituted phthalocyanine, and
X 1 and X 2 are each, independently of one another, halogen.
10. A method according to claim 9 wherein the light-absorbent compound comprises more than 90% by weight, of the phthalocyanine of the formula (I), based on the total light-absorbent compound.
11. A particulate solid preparation of a compound of the formula (I)
where
Me is a doubly axially substituted metal atom selected from the group consisting of Si, Ge, and Sn,
Pc is an unsubstituted phthalocyanine, and
X 1 and X 2 are each, independently of one another, halogen, wherein particles of the particulate solid preparation have a mean particle size of from 0.5 μm to 10 mm.
80 to 100% by weight of phthalocyanine,
0.1 to 1.0% by weight of residual moisture,
0 to 10% by weight of inorganic salts, and
0 to 10% by weight of further additives,
where the percentage are in each case based on the preparation and the sum of the percentages is 100%.
12. A preparation according to claim 11 wherein the additives comprise dispersants, surfactants, and/or wetting agents.
13. A solid shaped body comprising a phthalocyanine of the formula (I),
where
Me is a doubly axially substituted metal atom selected from the group consisting of Si, Ge, and Sn,
Pc is an unsubstituted phthalocyanine, and
X 1 and X 2 are each, independently of one another, halogen.
14. A solid body according to claim 13 comprising more than 90% by weight of the phthalocyanine of formula (I), based on the shaped body.
15. A solid shaped body according to claim 13 in the form of pellets or rods.
16. A dispersions containing a metal complex of the formula (I),
where
Me is a doubly axially substituted metal atom selected from the group consisting of Si, Ge, and Sn,
Pc is an unsubstituted phthalocyanine, and
X 1 and X 2 are each, independently of one another, halogen.
17. A dispersion according to claim 16 that is an aqueous dispersion.
18. A dispersion according to claim 16 comprising more than 90% by weight of the phthalocyanine of formula (I), based on the dispersion.
19. An optical data carrier according to claim 1 that has been written on by means of blue light.
20. An optical data carrier according to claim 19 wherein the blue light is a blue laser light.
21. An optical data carrier according to claim 19 wherein the blue light has a wavelength of 360 to 460 nm.