EMULSION BLEND FOR COATING CARBONATES
Provided herein are compositions and methods for the coating of nanoparticulates. More specifically, the present invention relates to a coated carbonate, a process for the preparation of such, and its use as an additive in the production of composite.
1 . A nanoparticulate composition, comprising surface-treated calcium carbonate nanoparticles;
wherein the calcium carbonate nanoparticles are treated with a fatty acid mixture comprising from about 40% to about 80% of a saturated fatty acid or mixture thereof and from about 20% to about 60% of an unsaturated fatty acid or mixture thereof;
wherein the unsaturated fatty acid or mixture thereof comprises at least about 10% elaidic acid or a salt thereof.
2 . The nanoparticulate composition of claim 1 , wherein the unsaturated fatty acid or mixture thereof comprises at least about 20% elaidic acid or a salt thereof.
3 . The nanoparticulate composition of claim 1 , wherein the unsaturated fatty acid or mixture thereof comprises a tall oil fatty acid (TOFA) or a salt thereof.
4 . The nanoparticulate composition of claim 1 , wherein the unsaturated fatty acid or mixture thereof comprises a vegetable-oil-based mixture or a salt thereof.
5 . The nanoparticulate composition of claim 1 , wherein the average particle diameter is from about 30 nm to about 200 nm.
6 . The nanoparticulate composition of claim 1 , wherein the average particle diameter is from about 50 nm to about 150 nm.
7 . The nanoparticulate composition of claim 1 , wherein the fatty acid mixture is from about 40% to about 64% of a saturated fatty acid or mixture thereof and from about 36% to about 60% of an unsaturated fatty acid or mixture thereof.
8 . The nanoparticulate composition of claim 7 , wherein the fatty acid mixture is about 60% of the saturated fatty acid or mixture thereof and about 40% of the unsaturated fatty acid or mixture thereof.
9 . The nanoparticulate composition of claim 1 , wherein the saturated fatty acid or mixture thereof comprises stearic acid or a salt thereof and palmitic acid or a salt thereof.
10 . The nanoparticulate composition of claim 1 , wherein the unsaturated fatty acid or mixture thereof comprises at least about 40% elaidic acid or the salt thereof.
11 . The nanoparticulate composition of claim 1 , wherein the unsaturated fatty acid or mixture thereof comprises oleic acid or a salt thereof and linoleic acid or a salt thereof.
12 . A filler composition comprising the nanoparticle composition of claim 1 .
13 . A method of preparing the nanoparticle composition of claim 1 , the method comprising:
preparing a surface coating emulsion comprising the fatty acid mixture under basic conditions; and
mixing the calcium carbonate nanoparticles with the surface coating emulsion.
14 . The method of claim 13 , wherein preparing the surface coating emulsion comprises
preparing a mixture with from about 5% to about 9% solids; and
stirring the mixture at about 80 to 85° C.
15 . The method of claim 14 , wherein stirring the mixture lasts for at least 30 min.
16 . The method of claim 13 , wherein the basic conditions require at least 1.03 equivalents of strong base.
17 . The method of claim 13 , wherein the method of preparing the nanoparticle composition further comprises
dewatering the surface-treated calcium carbonate nanoparticles.