Novel rheology regulators of the crushed natural calcium carbonate type, possibly treated with a fatty acid or its salt, and their application in polymeric compositions
The invention relates to the selection of a natural calcium carbonate crushed to a high degree of fineness, possibly treated with one or more fatty acids or one or more of their salts or mixtures thereof, and its use as a rheology regulator for polymeric compositions. The specific surface area is 14 to 30 m 2 /g measured according to the BET method to ISO 4652, and the oil absorption is greater than 16 measured according to ISO 787-V (Rub-out method). The conditions of mixing of the constituents and manufacture are improved, as well as the properties of the final product.
1 . A method of regulating the rheology during the manufacture of at least one of a sealant, an adhesive, a plastisol, and a rubber, comprising adding natural calcium carbonate, crushed to a high degree of fineness, with a specific surface area of around 14 to 30 m 2 /g measured according to the BET method to ISO 4652 to at least one of a sealant, an adhesive, a plastisol, and a rubber in an amount to regulate the rheology of at least one of a sealant, an adhesive, a plastisol, and a rubber.
2 . The method of claim 1 , wherein the calcium carbonate has a specific surface area of around 16 to 24 m 2 /g.
3 . The method of claim 1 , wherein the calcium carbonate has a specific surface area of around 20 m 2 /g.
4 . The method of claim 1 , wherein the natural calcium carbonate has a specific surface area of 14.4 m 2 /g.
5 . The method of claim 1 , wherein the natural calcium carbonate has a specific surface area of 16 m 2 /g.
6 . The method of claim 1 , wherein the natural calcium carbonate has a specific surface area of 16.5 m 2 /g.
7 . The method of claim 1 , wherein the natural calcium carbonate has a specific surface area of 22 m 2 /g.
8 . The method of claim 1 , wherein the natural calcium carbonate has a specific surface area of 28 m 2 /g.
9 . The method of claim 1 , wherein the natural calcium carbonate is treated with at least one fatty acid containing 10 to 24 carbon atoms or a salt thereof selected from the group consisting of calcium salt, magnesium salt, zinc salt, and mixtures thereof.
10 . The method of claim 1 , wherein the natural calcium carbonate is treated with stearic acid or a calcium salt thereof in a proportion of around 0.01% to 5% by weight.
11 . The method of claim 1 , wherein the natural calcium carbonate is treated with stearic acid or a calcium salt thereof in a proportion of around 1% to 4% by weight.
12 . The method of claim 1 , wherein the natural calcium carbonate has an oil absorption which is greater than 16 measured according to ISO 787-V (Rub-out method).
13 . The method of claim 1 , wherein the rheology of a sealant is regulated.
14 . The method of claim 1 , wherein the rheology of an adhesive is regulated.
15 . The method of claim 1 , wherein the rheology of a plastisol is regulated.
16 . The method of claim 1 , wherein the rheology of a rubber is regulated.