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US 2026/0028490 A1Published application
Stabilised mineral suspension
AssigneeCoatex
InventorsChristian JACQUEMET, Laurie PARRENIN, Morgane LE NEINDRE
Life of this patent
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Abstract
An aqueous suspension of a mineral material, for example calcium carbonate, may be prepared by wet grinding in the presence of an aqueous dispersion of (meth)acrylic polymer neutralized by a combination of at least one monovalent ion and at least one divalent ion, and post-grinding concentration. The particle size distribution and the viscosity and stability of the suspension may be particularly well controlled. Such a polymer may be an agent for facilitating grinding. Such a mineral suspension may be used for preparing a mass filler for paper production, for preparing a paper coating slip, or for preparing a coating composition, for example a paint composition.
Claims18
An aqueous suspension S, comprising:
- mineral particles in a concentration in a range of from 65 to 80 wt. %,
- wherein a mass distribution of particle sizes of the mineral particles, calculated as
- (
- d
-
- 30
- /
- d
-
- 70
- )
- ×
- 100
- ,
- having a slope factor E, measured by sedimentation analysis, that is greater than 30
- wherein the aqueous suspension S is prepared by a process comprising:
- grinding in water, at a concentration in a range of from 30 to 60 wt. %, a first aqueous suspension Sd, the first aqueous suspension Sd comprising a particulate mineral material M, in the presence of an aqueous dispersion D comprising an α-sulfonated polymer P with a molecular mass by weight (MW), measured by SEC, in a range of from 4,000 and 20,000 g/mol, to obtain a ground suspension Sd;
- and
- concentrating the ground suspension Sd,
- wherein the α-sulfonated polymer P is prepared in water and in the absence of any phosphorus compound, by a process comprising
- polymerizing a material comprising (A) acrylic acid, methacrylic acid, an acrylic acid salt, and/or a methacrylic acid salt, an initiator compound, and a sulfur compound T comprising sulfur in oxidation state IV, to obtain a first polymer and
- at least partially neutralizing the first polymer with a combination comprising a monovalent ion and a divalent ion.
19 more elements
A grinding agent, comprising:
- an aqueous dispersion D comprising an α-sulfonated polymer P with a molecular mass by weight (MW), measured by SEC, in a range of from 4,000 to 20,000 g/mol,
- wherein the an α-sulfonated polymer P is prepared in water and in the absence of any phosphorus compound, by a process comprising:
- polymerizing a starting material comprising acrylic acid, methacrylic acid, an acrylic acid salt, and/or a methacrylic acid salt, an initiator compound, and a sulfur compound T comprising sulfur in oxidation state IV, to obtain a first polymer;
- and
- at least partially neutralizing the first polymer by a combination comprising a monovalent ion and a divalent ion.
2 more elements
A method for preparing a mass filler composition suitable for papermaking or a paper coating color composition, the method comprising:
- preparing an aqueous suspension S comprising mineral particles with a particle concentration in a range of from 65 to 80 wt. %, a mass distribution of particle sizes of the mineral particles having a slope factor E calculated as
- (
- d
-
- 30
- /
- d
-
- 70
- )
- ×
- 100
- ,
- measured by sedimentation analysis, greater than 30;
- and
- mixing the aqueous suspension S with an additive comprising a binding agent, and optionally a rheology modifying agent, a water-retaining agent, an optical brightening agent, an organic pigment, and/or a mineral pigment,
- wherein the aqueous suspension S is prepared by a process comprising:
- grinding in water, at a concentration in a range of from 30 to 60 wt. % of an aqueous suspension Sd, a pre-grind material comprising a particulate mineral material M in the presence of an aqueous dispersion D comprising an α-sulfonated polymer P with a molecular mass by weight (MW), measured by SEC, in a range of from 4,000 and 20,000 g/mol, to obtain a ground suspension Sd;
- and
- concentrating the ground suspension Sd;
- wherein the α-sulfonated polymer P is prepared in water and in the absence of any phosphorus compound, by a process comprising:
- polymerizing a starting material comprising acrylic acid, methacrylic acid, an acrylic acid salt, and/or a methacrylic acid salt, an initiator compound, and a sulfur compound T comprising sulfur in oxidation state IV, to obtain a first polymer;
- and
- at least partially neutralizing the first polymer by a combination comprising a monovalent ion and a divalent ion.
21 more elements
A method for preparing a coating composition, the method comprising:
- preparing an aqueous suspension S comprising mineral particles with a particle concentration in a range of from 65 to 80 wt. %, a mass distribution of particle sizes of the mineral particles having a slope factor E calculated as
- (
- d
-
- 30
- /
- d
-
- 70
- )
- ×
- 100
- ,
- measured by sedimentation analysis, greater than 30;
- and
- mixing the aqueous suspension S with an additive comprising a binder compound, and optionally a rheology modifying compound, an organic pigment, and/or a mineral pigment,
- wherein the aqueous suspension S is prepared by a process comprising:
- grinding in water, at a concentration in a range of from 30 to 60 wt. % of an aqueous suspension Sd, a pre-grind material comprising a particulate mineral material M in the presence of an aqueous dispersion D comprising an α-sulfonated polymer P with a molecular mass by weight (MW), measured by SEC, in a range of from 4,000 and 20,000 g/mol, to obtain a ground suspension Sd;
- and
- concentrating the ground suspension Sd;
- wherein the α-sulfonated polymer P is prepared in water and in the absence of any phosphorus compound, by a process comprising:
- polymerizing a starting material comprising acrylic acid, methacrylic acid, an acrylic acid salt, and/or a methacrylic acid salt, an initiator compound, and a sulfur compound T comprising sulfur in oxidation state IV, to obtain a first polymer;
- and
- at least partially neutralizing the first polymer by a combination comprising a monovalent ion and a divalent ion.
21 more elements
A coating composition, comprising:
- preparing an aqueous suspension S comprising mineral particles with a particle concentration in a range of from 65 to 80 wt. %, a mass distribution of particle sizes of the mineral particles having a slope factor E calculated as
- (
- d
-
- 30
- /
- d
-
- 70
- )
- ×
- 100
- ,
- measured by sedimentation analysis, greater than 30;
- a binder compound;
- and
- optionally, a rheology modifying compound, an organic pigment, and/or mineral pigment,
- wherein the aqueous suspension S is prepared by a process comprising:
- grinding in water, at a concentration in a range of from 30 to 60 wt. % of an aqueous suspension Sd, a pre-grind material comprising a particulate mineral material M in the presence of an aqueous dispersion D comprising an α-sulfonated polymer P with a molecular mass by weight (MW), measured by SEC, in a range of from 4,000 and 20,000 g/mol, to obtain a ground suspension Sd;
- and
- concentrating the ground suspension Sd;
- wherein the α-sulfonated polymer P is prepared in water and in the absence of any phosphorus compound, by a process comprising:
- polymerizing a starting material comprising acrylic acid, methacrylic acid, an acrylic acid salt, and/or a methacrylic acid salt, an initiator compound, and a sulfur compound T comprising sulfur in oxidation state IV, to obtain a first polymer;
- and
- at least partially neutralizing the first polymer by a combination comprising a monovalent ion and a divalent ion.
22 more elements
A method of controlling, a slope factor E of a mass distribution of particle sizes, calculated as
- (
- d
-
- 30
- /
- d
-
- 70
- )
- ×
- 100
- ,
- measured by sedimentation analysis, of an aqueous suspension S comprising mineral particles with a particle concentration in a range of from 65 to 80 wt. %, the method comprising:
- grinding in water, at a concentration in a range of from 30 to 60 wt. % of an aqueous suspension Sd, a pre-grind material comprising a particulate mineral material M in the presence of an aqueous dispersion D comprising an α-sulfonated polymer P with a molecular mass by weight (MW), measured by SEC, in a range of from 4,000 and 20,000 g/mol, to obtain a ground suspension Sd;
- and
- concentrating the ground suspension Sd;
- wherein the α-sulfonated polymer P is prepared in water and in the absence of any phosphorus compound, by a process comprising:
- polymerizing a starting material comprising acrylic acid, methacrylic acid, an acrylic acid salt, and/or a methacrylic acid salt, an initiator compound, and a sulfur compound T comprising sulfur in oxidation state IV, to obtain a first polymer;
- and
- at least partially neutralizing the first polymer by a combination comprising a monovalent ion and a divalent ion.
17 more elements
Dependencies are inferred from the claim text.