Titanium dioxide pigment and manufacturing method
View Patent ↗A novel polymer comprising a water soluble polymer backbone, at least one functional group attached to the polymer backbone and having an affinity for titanium dioxide, and at least one hydrophobic functional group attached to the polymer backbone and having an affinity for latex is provided. A titanium dioxide pigment composition including the novel polymer is also provided. Also provided is a method of manufacturing a titanium dioxide pigment composition that includes the novel polymer.
1. A titanium dioxide pigment composition, comprising:
a plurality of titanium dioxide particles; and
a polymer associated with said titanium dioxide particles, said polymer including:
a water soluble polymer backbone;
at least one functional group attached to said polymer backbone and having an affinity for titanium dioxide formed by the reaction of said polymer backbone with a urea and comprising a hydroxyl group; and
at least one hydrophobic functional group attached to said polymer backbone and having an affinity for latex, said hydrophobic functional group attached to said polymer backbone and having an affinity for latex being selected from the group of a super hydrophobic functional group and a functional group formed by the reaction of said polymer backbone with an aliphatic compound, an aromatic compound, an aliphatic-aromatic compound, an alcohol, an ester, a thiol, an acid, an anhydride, or an acyl halide, wherein said polymer interacts with said titanium dioxide particles and latex particles in an aqueous based coating formulation to inhibit agglomeration of said titanium dioxide particles while the coating formulation dries.
2. The titanium dioxide pigment composition of claim 1 , wherein said hydrophobic functional group attached to said polymer backbone and having an affinity for latex is formed by the reaction of said polymer backbone with a compound selected from the group of an aliphatic compound, an aromatic compound and an aliphatic-aromatic compound.
3. The titanium dioxide pigment composition of claim 1 , wherein said hydrophobic functional group attached to said polymer backbone and having an affinity for latex is formed by the reaction of said polymer backbone with an alcohol.
4. The titanium dioxide pigment composition of claim 1 , wherein said hydrophobic functional group attached to said polymer backbone and having an affinity for latex is formed by the reaction of said polymer backbone with a compound selected from the group consisting of an ester, a thiol, an acid, an anhydride and an acyl halide.
5. The titanium dioxide pigment composition of claim 1 , wherein said water soluble polymer backbone comprises nitrogen.
6. The titanium dioxide pigment composition of claim 1 , wherein said water soluble polymer backbone is selected from the group consisting of polyoxymethylene, polyoxazoline, and polyvinyl ether.
7. The titanium dioxide pigment composition of claim 1 , wherein said water soluble polymer backbone is a polyoxyalkylene polymer or copolymer.
8. The titanium dioxide pigment composition of claim 1 , wherein said titanium dioxide particles are rutile titanium dioxide particles manufactured by the chloride process.
9. The titanium dioxide pigment composition of claim 1 , wherein said polymer is present in said titanium dioxide pigment composition in an amount in the range of from 0.01 to 1% by weight, based on the total weight of said titanium dioxide pigment composition.
10. The titanium dioxide pigment composition of claim 1 , further comprising an aqueous media.
11. A method of manufacturing a titanium dioxide pigment composition, comprising:
manufacturing titanium dioxide particles; and
associating a polymer with said titanium dioxide particles that interacts with latex particles in an aqueous based, latex containing coating formulation to inhibit agglomeration of said titanium dioxide particles in said coating formulation while the coating formulation dries, wherein said polymer includes:
a water soluble polymer backbone;
at least one functional group attached to said polymer backbone and having an affinity for titanium dioxide formed by the reaction of said polymer backbone with a urea, and comprising a hydroxyl group; and
at least one hydrophobic functional group attached to said polymer backbone and having an affinity for latex, said hydrophobic functional group attached to said polymer backbone and having an affinity for latex being selected from the group of a super hydrophobic functional group and a functional group formed by the reaction of said polymer backbone with an aliphatic compound, an aromatic compound, an aliphatic-aromatic compound, an alcohol, an ester, a thiol, an acid, an anhydride, or an acyl halide.
12. The method of claim 11 , wherein said polymer is associated with said titanium dioxide particles by mixing said polymer with said titanium dioxide particles in an aqueous medium.