Plant char colorants
Described herein are methods, and compositions for use in the coloration of materials. The compositions described herein are black pigments derived primarily from recently-living plants or animals and are therefore renewable.
1 . A pigment dispersion formulation comprising carbonaceous particulate matter derived from biochar, a dispersant, micro fibrillated cellulose, and a milling fluid.
2 . A pigment dispersion formulation comprising carbonaceous particulate matter derived from biochar, a dispersant and a milling fluid, wherein under laser excitation at a wavelength of 514.5 nm with an 1800 gr/mm grating the formulation exhibits a Raman spectra with a G position between about 1580 (cm −1 ) and about 1605 (cm −1 ) and an I(D)/I(G) ratio between about 2.49 and about 3.07.
3 . A pigment dispersion formulation comprising carbonaceous particulate matter derived from biochar, a dispersant and a milling fluid, wherein blackness (My) is greater than about 250.
4 . A pigment dispersion formulation comprising carbonaceous particulate matter derived from biochar, a dispersant and a milling fluid, wherein jetness (Mc) is greater than about 250.
5 . A pigment dispersion formulation comprising carbonaceous particulate matter derived from biochar, a dispersant and a milling fluid, wherein tint strength is greater or equal to 94%.
6 . A pigment dispersion formulation comprising carbonaceous particulate matter derived from biochar, a dispersant and a milling fluid, wherein color fastness is 8.
7 . A mill base for milling a pigment comprising carbonaceous particulate matter derived from biochar, said mill base comprising said pigment and further comprising a dispersant, micro fibrillated cellulose, and a milling fluid.
8 . A pigment dispersion formulation comprising carbonaceous particulate matter derived from biochar, a 100% active dispersant, micro fibrillated cellulose and an activator/vehicle.
9 . A pigment dispersion formulation comprising carbonaceous particulate matter derived from biochar, a 100% active dispersant, and an activator/vehicle, wherein under laser excitation at a wavelength of 514.5 nm with an 1800 gr/mm grating the formulation exhibits a Raman spectra with a G position between about 1580 (cm −1 ) and about 1605 (cm −1 ) and an I(D)/I(G) ratio between about 2.49 and about 3.07.
10 . A pigment dispersion formulation comprising carbonaceous particulate matter derived from biochar, a 100% active dispersant, and an activator/vehicle, wherein blackness (My) is greater than about 250.
11 . A pigment dispersion formulation comprising carbonaceous particulate matter derived from biochar, a 100% active dispersant, and an activator/vehicle, wherein jetness (Mc) is greater than about 250.
12 . A pigment dispersion formulation comprising carbonaceous particulate matter derived from biochar, a 100% active dispersant, and an activator/vehicle, wherein tint strength is greater or equal to 94%.
13 . A pigment dispersion formulation comprising carbonaceous particulate matter derived from biochar, a 100% active dispersant, and an activator/vehicle, wherein color fastness is 8.
14 . The mill base of claim 7 , further comprising an activator/vehicle, wherein the dispersant is a 100% active dispersant.
15 . A pigment dispersion formulation comprising carbonaceous particulate matter derived from biochar, a dispersant and a milling fluid, wherein a randomized sample of the carbonaceous particulate matter has a size distribution with a mean size (Z-Ave (d·nm)) that is within a range between 118 nm and 171 nm and a polydispersity index that is within a range between 0.05% and 0.15% of the mean size (Z-Ave (d·nm)).
16 . A pigment dispersion formulation comprising carbonaceous particulate matter derived from biochar, a 100% active dispersant, and an activator/vehicle, wherein a randomized sample of the carbonaceous particulate matter has a size distribution with a mean size (Z-Ave (d·nm)) that is within a range between 118 nm and 171 nm and a polydispersity index that is within a range between 0.05% and 0.15% of the mean size (Z-Ave (d·nm)).