Fast Dispersing Pigment Brown 29
AssigneeSun Chemical Corporation
InventorsDavid BÖHNISCH, Aron WOSYLUS, Christian FISCHER, Joachim FELLER
Life of this patent
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Abstract
A chromium and iron oxide-based pigment with Pigment Brown 29 as a color index which was dry milled and can be fast dispersed in different solvent and water-based coatings.
Claims24
A dry Pigment Brown 29 pigment composition, comprising chromium and an iron-based oxide with a hematite structure, wherein the pigment composition is dry milled on a jet mill, hammer mill, dry ball mill or pen mill for reducing the particle size distribution as well as the fineness of the grind,
- wherein the dry-milled pigment exhibits a Dispersibility Index (DI) increase of >100%, vs. the commercially available Pigment Brown 29, Sicopal Black 0095 from BASF as a comparable example, after being subjected to 30 minutes of dispersion using a dissolver dispersion process in a melamine-based solvent borne binder system or a water-based binder system, and wherein DI is determined according to Equation 1:
- DI
- =
- 10
- 3
- ·
- Color
-
- Strength
- FOG
- 2
- (
- μm
- )
- ·
- Lightness
-
- Value
- ·
- Dv
-
- (
- 100
- )
-
- (
- μm
- )
- .
- (
- Equation
-
- 1
- )
- and wherein
- the color strength in the melamine-based solvent borne binder system is in the range from 105 to 155;
- the FOG in the melamine-based solvent borne binder system is in the range of from 5 to 20 μm;
- the lightness value in the melamine-based solvent borne binder system is in the range of from 6 to 25;
- and wherein
- the color strength in the water-based binder system is in the range of from 90 to 120;
- the FOG in the water-based binder system is in the range of from 5 to 25 μm;
- the lightness value in the water-based binder system is in the range of from 3 to 12,
- and wherein for the comparative example when a melamine-based solvent borne binder test system is used which is a combination of a thermosetting hydroxylated acrylic resin, an OH functional hyperbranched polyester and melamine formaldehyde resin with a ratio of pigment binder being 50:50, the viscosity being adjusted with a 7:3 mixture of xylol and butoxy propanol to a viscosity of about 0.59 Pa·s at a shear rate of 100 s−1, the lightness value is 11.7, the color strength is 124, the FOG is 25 μm and the DI value is 1.8/μm3,
- and wherein for the comparative example when a water-based test system is used which consists of polyethylene glycol and water with a ratio of pigment binder being 70:30, the viscosity being adjusted with a mixture of polyurethane and water to a viscosity of about 0.05 Pa·s at a shear rate of 100 s−1, the lightness value is 5.6, the color strength is 104, the FOG is 30 μm and the DI value is 1.8/μm3.
A dry milled Pigment Brown 29 pigment composition, comprising chromium and an iron-based oxide with a hematite structure, wherein the pigment composition is dry milled on a jet mill, hammer mill, dry ball mill or pen mill for reducing the particle size distribution as well as the fineness of the grind,
- wherein the dry-milled pigment exhibits a Dispersibility Index (DI) increase of >500%, vs. a commercially available Pigment Brown 29, Sicopal Black 0095 from BASF as a comparable example, after being subjected to 30 minutes of dispersion using a dissolver dispersion process in a two-component polyurethane solvent borne system, and wherein DI is determined according to Equation 1:
- DI
- =
- 10
- 3
- ·
- Color
-
- Strength
- FOG
- 2
- (
- μm
- )
- ·
- Lightness
-
- Value
- ·
- Dv
-
- (
- 100
- )
-
- (
- μm
- )
- .
- (
- Equation
-
- 1
- )
- and wherein
- the color strength is in the range from 100 to 130;
- the FOG is in the range of from 5 to 20 μm;
- the lightness value is in the range of from 6 to 25;
- and wherein for the comparative example when a two-component polyurethane solvent borne binder system is used consisting of a hydroxy functional acrylic resin for cross-linking with polyisocyanates, the ratio of pigment:binder being 50:50, the viscosity being adjusted with a 2:1 mixture of xylol and methiopropamine to a viscosity of about 10.46 Pa·s at a shear rate of 100 s−1, and, as a curing agent, an aliphatic polyisocyanate being used, the lightness value is 11.4, the color strength is 112, the FOG is 17 μm and the DI value is 3.7/μm3.
A dry milled Pigment Brown 29 pigment composition, comprising chromium and an iron-based oxide with a hematite structure, wherein the pigment composition is dry milled on a jet mill, hammer mill, dry ball mill or pen mill for reducing the particle size distribution as well as the fineness of the grind,
- wherein the dry-milled pigment exhibits a Dispersibility Index (DI) increase of >1000 vs. a commercially available Pigment Brown 29, Sicopal Black 0095 from BASF as a comparable example, after being subjected to 30 minutes of dispersion using a dissolver dispersion process in a Polyvinylidene fluoride (PVDF) resin-based binder system, wherein DI is determined according to Equation 1:
- DI
- =
- 10
- 3
- ·
- Color
-
- Strength
- FOG
- 2
- (
- μm
- )
- ·
- Lightness
-
- Value
- ·
- Dv
-
- (
- 100
- )
-
- (
- μm
- )
- .
- (
- Equation
-
- 1
- )
- and wherein
- the color strength is in the range from 100 to 130;
- the FOG is in the range of from 2 to 15 μm;
- the lightness value is in the range of from 6 to 25;
16-27. (canceled)
29-30. (canceled)
34-35. (canceled)
37-49. (canceled)
Dependencies are inferred from the claim text.