Amino phosphoryl treated titanium dioxide
View Patent ↗The invention is a pigment comprising titanium dioxide and an amino phosphoryl compound. The pigment of the invention imparts improved physical qualities, such as improved lacing resistance and dispersion, when incorporated into polymers.
1. A pigment comprising titanium dioxide that has been treated with an amino phosphoryl compound, wherein the amino phosphoryl compound is represented by one of the following formulae:
wherein R, R 1 , R 2 , R 3 , and R 4 are the same or different H or C 1 –C 22 hydrocarbyl, X, X 1 , X 2 , and X 3 are the same or different H, C 1 –C 22 hydrocarbyl, ammonium, alkylammonium, or alkali metal, and y=0 or 1.
2. The pigment of claim 1 wherein the amino phosphoryl compound has the formula:
wherein R is a C 4 –C 18 alkyl and R 1 and R 2 are H.
3. The pigment of claim 1 wherein the amino phosphoryl compound has the formula:
wherein R is a C 4 –C 18 alkyl and R 1 is H.
4. The pigment of claim 1 wherein the amino phosphoryl compound has the formula:
wherein R is a C 4 –C 18 alkyl and R 1 , R 2 , R 3 , and R 4 are H.
5. The pigment of claim 1 wherein the amino phosphoryl compound has the formula:
wherein R is a C 4 –C 18 alkyl and R 1 is H.
6. The pigment of claim 1 wherein the titanium dioxide contains an inorganic oxide coating selected from the group consisting of silicon dioxide, aluminum oxide, zirconium oxide, and mixtures thereof.
7. The pigment of claim 6 wherein the inorganic oxide coating is added to the titanium dioxide by a wet treatment deposition.
8. The pigment of claim 6 wherein the inorganic oxide coating is added to the titanium dioxide by a gas-phase deposition.
9. The pigment of claim 1 wherein the titanium dioxide has a particle size in the range of from 0.001 to 20 μm.
10. The pigment of claim 1 further comprising a polyalcohol, alkanolamine, inorganic phosphate, or mixtures thereof.
11. The pigment of claim 1 wherein the amino phosphoryl compound is present in the amount from about 0.1 to about 6 weight percent, based on the weight of the titanium dioxide.
12. The pigment of claim 1 wherein the amino phosphoryl compound is present in the amount from about 0.1 to about 2 weight percent, based on the weight of the titanium dioxide.
13. A composition comprising a polymer and the pigment of claim 1 , wherein the polymer is selected from the group consisting of polyethylenes, polypropylenes, polystyrenes, polycarbonates, polyvinylchlorides, and copolymers of ethylene and C 4-12 α-olefins.
14. The composition of claim 13 wherein the amount of pigment is from about 40 percent to about 85 percent by weight of the composition.