TREATED INORGANIC PIGMENTS HAVING IMPROVED BULK FLOW AND THEIR USE IN COATING COMPOSITIONS
The disclosure provides a coating composition comprising a treated inorganic pigment, wherein the treated inorganic pigment comprises an inorganic pigment comprising a pigment surface area of about 30 to about 75 m 2 /g; wherein the pigment surface is treated with an organic treating agent comprising a polyalkanol alkane or a polyalkanol amine, present in the amount of at least about 1.5%, and wherein the treated inorganic pigment has a RHI (rat hole index) of about 7 to about 11.
1 . A coating composition comprising a treated inorganic pigment, wherein the treated inorganic pigment comprises an inorganic pigment comprising a pigment surface area of about 30 to about 75 m2/g; wherein the pigment surface is treated with an organic treating agent comprising a polyalkanol alkane or a polyalkanol amine, present in the amount of at least about 1.5%, and wherein the treated inorganic pigment has a RHI (rat hole index) of about 7 to about 11.
2 . The coating composition of claim 1 further comprising a resin.
3 . The coating composition of claim 2 wherein the resin is acrylic, styrene-acrylic, vinyl-acrylic, ethylene-vinyl acetate, vinyl acetate, alkyd, vinyl chloride, styrene-butadiene, vinyl versatate, vinyl acetate-maleate, or a mixture thereof.
4 . The coating composition of claim 3 wherein the alkyd resin is a complex branched or cross-linked polyester having unsaturated aliphatic acid residues.
5 . (canceled)
6 . The coating composition of claim 2 wherein the resin is a urethane resin, and the urethane resin comprises the reaction product of a polyisocyanate and a polyhydric alcohol ester of drying oil acids.
7 . (canceled)
8 . The coating composition of claim 2 wherein the resin is present in the amount of about 5 to about 40 % by weight, based on the total weight of the coating composition.
9 . The coating composition of claim 1 wherein the inorganic pigment is ZnS, TiO 2 , CaCO 3 , BaSO 4 , ZnO, MoS 2 , silica, talc or clay.
10 . The coating composition of claim 9 wherein the inorganic pigment is titanium dioxide.
11 . The coating composition of claim 1 wherein the pigment surface area is about 40 to about 70 m 2 /g.
12 . (canceled)
13 . The coating composition of claim 1 wherein the organic treating agent is a polyalkanol alkane.
14 . The coating composition of claim 13 wherein the polyalkanol alkane is trimethylolpropane, trimethylolethane, glycerol, ethylene glycol, propylene glycol, 1,3 propanediol, or pentaerythritol.
15 . (canceled)
16 . The coating composition of claim 1 wherein the organic treating agent is a polyalkanol amine.
17 . The coating composition of claim 16 wherein the polyalkanol amine is 2-amino-2methyl-1-propanol, triethanol amine, monoethanol amine, diethanol amine, 1-amino 2-propanol, or 2-amino ethanol.
18 . (canceled)
19 . The coating composition of claim 1 wherein the organic treating agent is present in the amount of at least about 1.8%, based on the total weight of the treated pigment.
20 . (canceled)
21 . The coating composition of claim 1 further treated with metal oxides.
22 . The coating composition of claim 21 wherein the metal oxide treatment comprises silica, alumina, tungsten, zirconia, zinc oxide, or molybdenum oxide.
23 . The coating composition of claim 22 wherein the metal oxides are present in the amount of 0.1 to about 20 wt %, based on the total weight of the treated pigment.
24 . The coating composition of claim 1 wherein the coating composition is a paint.
25 . The coating composition of claim 24 wherein the paint is applied to a surface selected from the group consisting of building material, automobile part, sporting good, tenting fabric, tarpaulin, geo membrane, stadium seating, lawn furniture and roofing material.
26 . A dried coating prepared from a coating composition comprising a treated inorganic pigment, wherein the treated inorganic pigment comprises an inorganic pigment comprising a pigment surface area of about 30 to about 75 m 2 /g; wherein the pigment surface is treated with an organic treating agent comprising a polyalkanol alkane or a polyalkanol amine, present in the amount of at least about 1.5%, and wherein the treated inorganic pigment has a RHI (rat hole index) of about 7 to about 11.