Ether derivatives of raw cotton linters for water-borne coatings
View Patent ↗A water-borne coating composition containing an ether derivative of raw cotton linters (RCL), a latex polymer, and water in which the ether derivative RCL provides improved rheological properties when compared to analogous cellulose ether compounds produced from more refined cellulose sources while not substantially degrading the coating composition's aesthetic qualities.
1. A water-borne coating composition comprising an ether derivative of raw cotton linters (RCL), a latex polymer, and water, wherein the ether derivative of RCL has been prepared from RCL that have been cut prior to etherification and wherein the ether derivative of RCL has a particle size having a 50% median value in dry powder form of less than about 100.0 μm, as measured using laser diffraction, wherein the water-borne coating composition further comprises a pigment and wherein the water-borne coating has a pigment volume concentration (PVC) upper limit of 85%.
2. The water-borne coating composition of claim 1 , wherein the ether derivative of RCL is selected from the group consisting of ethoxylated RCL, propoxylated RCL, methylated RCL, methylated ethoxylated RCL, methylated propoxylated RCL, ethoxylated ethylated RCL, carboxymethylated RCL, hydrophobically modified ethoxylated RCL, hydrophobically modified ethoxylated ethylated RCL, hydrophobically modified carboxymethylated RCL, hydrophobically modified ethoxylated carboxymethylated RCL, and hydrophobically modified ethoxylated sulfoalkylated RCL.
3. The water-borne composition of claim 2 , wherein the ether derivative of RCL comprises ethoxylated RCL.
4. The water-borne composition of claim 2 , wherein the ether derivative of RCL comprises carboxymethylated RCL.
5. The water-borne composition of claim 2 , wherein the ether derivative of RCL comprises methylhydroxyethylated RCL.
6. The water-borne composition of claim 2 , wherein the water-borne coating composition further comprises one or more of a binder, a dispersant, a defoamer, a wet-edge agent, a preservative, a coalescing agent, a biocide, a humectant, a pH modifier, and a colorant.
7. The water-borne composition of claim 2 wherein the ether derivative of RCL is prepared from a loose mass of comminuted raw cotton linter fibers that a) has a bulk density of at least 8 g/100 ml and b) wherein at least 95% of RCL fibers pass through a US standard sieve size #100 (150 μm opening).
8. The water-borne composition of claim 2 wherein the ether derivative of RCL is prepared from a loose mass of comminuted raw cotton linter fibers that a) has a bulk density of at least 8 g/100 ml and b) wherein at least 95% of the RCL fibers through a US standard sieve size #200 (75 μm opening).
9. The water-borne composition of claim 2 wherein the ether derivative of RCL is prepared from a loose mass of comminuted raw cotton linter fibers that a) has a bulk density of at least 8 g/100 ml and b) wherein at least 95% of RCL fibers pass through a US standard sieve size #325 (45 μm opening).
10. The water-borne coating composition of claim 1 , wherein the latex polymer is selected from the group consisting of acrylics, vinyl-acrylics, styrene-acrylics, vinyls, alkyds, cellulosics, coumarone-indenes, epoxies, esters, hydrocarbons, melamines, natural resins, oleo resins, phenolics, polyamides, polyesters, rosins, silicones, styrenes, terpenes, ureas, and urethanes.
11. The water-borne coating composition of claim 1 , wherein the pigment is selected from the group consisting of calcium carbonate, diatomaceous earth, mica, hydrated aluminum oxide, barium sulfate, calcium silicate, clay, silica, talc, titanium dioxide, zinc oxide, aluminum silicate, nepheline syenite, and mixtures thereof.
12. The water-borne coating composition of claim 1 , wherein the water-borne coating has a pigment volume concentration (PVC) upper limit of 75%.
13. The water-borne coating composition of claim 12 , wherein the water-borne coating has a pigment volume concentration (PVC) upper limit of 65%.
14. The water-borne coating composition of claim 1 , wherein the water-borne coating has a pigment volume concentration (PVC) lower limit of 10%.
15. The water-borne coating composition of claim 1 , wherein the water-borne coating has a pigment volume concentration (PVC) lower limit of 20%.
16. The water-borne composition of claim 1 wherein the ether derivative of RCL has been milled.
17. The water-borne composition of claim 1 wherein the ether derivative of RCL has a particle size having a 50% median value in dry powder form of less than about 95.0 μm, as measured using laser diffraction.
18. The water-borne composition of claim 1 wherein the ether derivative of RCL has a particle size having a 50% median value in dry powder form of less than about 80.0 μm, as measured using laser diffraction.