Method for making highly colored DVDs
View Patent ↗Embodiments of highly colored optical discs and methods for making the same are disclosed. For examples, specification discloses a DVD composition that comprises a bonding layer and a data layer disposed there between, wherein at least one of the substrates is a read side substrate comprising a highly colored polycarbonate comprising an optical quality polycarbonate resin and a colorant formulation in the range of 0.1 to 0.4 wt % of the highly colored polycarbonate.
1. A method for producing a highly colored DVD substrate comprising combining an optical quality polycarbonate resin with a colorant formulation to form a highly colored polycarbonate mixture wherein the colorant formulation is present in an amount of at least of 0.15% wt of the highly colored polycarbonate mixture and wherein the total of the metal impurities from the colorant formulation in the highly colored polycarbonate mixture is less than 1.90 ppm and more than 0.04 ppm.
2. The method according to claim 1 wherein the colorant formulation is present in an amount of less than 0.4 wt % of the highly colored polycarbonate mixture.
3. A method for producing a highly colored DVD substrate comprising combining an optical quality polycarbonate resin with a colorant formulation to form a highly colored polycarbonate mixture wherein the colorant formulation is present an amount of at least 0.15 wt % of the highly colored polycarbonate mixture and wherein the combined total of iron, sodium, and calcium metal impurities from the colorant formulation in the highly colored polycarbonate mixture is less than 1.90 ppm more than 0.04 ppm.
4. The method according to claim 2 wherein the colorant formulation is present in an amount of less than 0.4 wt % of the highly colored polycarbonate mixture.
5. A method for producing a highly colored DVD substrate comprising the step of combining an optical quality polycarbonate resin with a colorant formulation to form a highly colored polycarbonate mixture wherein the colorant formulation is present in an amount of at least of 0.15 wt % of the highly colored polycarbonate mixture and wherein the total metal impurities from the colorant formulation in the highly colored polycarbonate mixture is less than 1.90 ppm and more than 0.04 ppm wherein said combining step comprises adding a color concentrate to the optical quality polycarbonate resin.
6. The method according to claim 5 wherein the colorant formulation is present in an amount of less than 0.4 wt % of the highly colored polycarbonate mixture.
7. A highly colored optical disk comprising:
(i) a first substrate,
(ii) a second substrate
(iii) a bonding layer, and
(iv) a data layer,
wherein the bonding layer and data layer are disposed between the first substrate and the second substrate, wherein the data layer has a shape configured to correspond to meaningful data when read by detecting reflections of a laser beam incident upon the first substrate, wherein the first substrate comprises a highly colored polycarbonate mixture comprising an optical quality polycarbonate resin and a colorant formulation in the range of at least 0.15 weight % of the highly colored polycarbonate wherein the total metal impurities in the highly colored polycarbonate mixture is less than 1.90 ppm and more than 0.04 ppm.
8. The highly colored DVD according to claim 7 wherein the first substrate has a UV Bonding Index of greater than or equal to 5.
9. The highly colored DVD substrate according to claim 7 wherein the colorant formulation is present in an amount of less than 0.4 wt % of the highly colored polycarbonate mixture.
10. The highly colored DVD substrate according to claim 9 wherein the disk has a PISUM8 test value of less than 280 after aging at 80° C. and 85% relative humidity for 4 days.
11. A highly colored DVD comprising:
(i) a first substrate,
(ii) a second substrate
(iii) a bonding layer, and
(iv) a data layer,
wherein the major bonding layer and data layer are disposed between the first substrate and the second substrate, wherein the data layer has a shape configured to correspond to meaningful data when read by detecting reflections of a laser beam incident upon the first substrate, wherein the first substrate comprises a highly colored polycarbonate mixture comprising an optical quality polycarbonate resin and a colorant formulation in the range of 0.15 to 0.4 weight % of the highly colored polycarbonate wherein said DVD is made by a process comprising the step of adding a colorant formulation to the optical quality polycarbonate resin wherein the total metal impurities from the colorant formulation in the highly colored polycarbonate mixture is less than 1.50 ppm and more than 0.04 ppm.
12. The highly colored DVD substrate according to claim 11 wherein the disk has a PISUM8 test value of less than 280 after aging at 80° C. and 85% relative humidity for 4 days.