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US-12617968-B2 - Osidic dispersing agent

US12617968B2US 12617968 B2US12617968 B2US 12617968B2US-12617968-B2

Abstract

A dispersing agent may be suitable for an aqueous composition, in particular for dispersing a mineral material in the form of particles. Such a dispersing agent may include a dispersing polymer combined with an osidic derivative or a derivative of saccharide origin. An aqueous composition may include such a dispersing agent and a mineral material in the form of particles.

Inventors

  • Francis Bony
  • MORGANE LE NEINDRE
  • Benoit Magny
  • Yves MATTER
  • Jean-Marc Suau

Assignees

  • COATEX

Dates

Publication Date
20260505
Application Date
20191114
Priority Date
20181116

Claims (20)

  1. 1 . An aqueous composition, comprising, as a dry weight based on total aqueous composition weight: (a) a mineral material in particle form, in a range of from 30 to 75%; and (b) an aqueous dispersing agent in a range of from 0.02 to 2%, the aqueous dispersing agent comprising: water; in the water, a polymer (P) prepared by a process comprising radically polymerizing, at a temperature greater than 50° C., a monomer comprising a first anionic monomer (M1) comprising a polymerizable olefinic unsaturation and a carboxylic acid group, optionally in salt form, in a reaction environment comprising hydrogen peroxide, benzoyl peroxide, acetyl peroxide, lauryl peroxide, tert-butyl hydroperoxide, cumene hydroperoxide, ammonium persulfate, an alkali metal persulfate, and/or an azo compound, as a radical-generating compound, optionally as an association comprising a Fe II , Fe III , Cu I , and/or Cu II ion; and in the water, a derivative(S) comprising (S1) an ose comprising from 3 to 8 carbon atoms, (S2) an ose oligomer comprising from 1 to 10 ose units, and/or (S3) a product resulting from degradation of a saccharide, wherein the aqueous composition has a viscosity of no more than 1.140 mPa·s, measured using a Brookfield RVI viscometer at 100 rpm and 25° C., wherein the monomer comprises the first anionic monomer (M1) in at least 50 wt. %, based on total monomer weight, wherein the first anionic monomer (M1) is acrylic acid, methacrylic acid, and/or itaconic acid, optionally in salt form, wherein the polymer (P) is at least partially neutralized, and wherein an S/P ratio of dry weight amounts of the derivative(S) to the polymer (P) in the water is in a range of from 0.6 to 10.
  2. 2 . The composition of claim 1 , wherein the reaction environment of the radically polymerizing further comprises: a first compound comprising phosphorus in oxidation state I; a second compound comprising a bisulfite ion; a third compound comprising phosphorus in oxidation state III; a xanthate derivative, a mercaptan compound, and/or a compound of formula (I), in a range of from 0.05 and 5 wt. %, relative to a total monomer mass: X independently being H, Na, or K, and R independently being a C 1 -C 5 -alkyl group; or a reducing compound.
  3. 3 . The composition of claim 1 , wherein the first anionic monomer (M1) comprises a further carboxylic acid group.
  4. 4 . The composition agent of claim 1 , wherein the monomer further comprises: a second anionic monomer (M1) different from the first monomer (M1); a non-ionic monomer (M2) comprising a polymerizable olefinic unsaturation; a monomer (M3) comprising 2-acrylamido-2-methylpropanesulfonic acid, a 2-acrylamido-2-methylpropanesulfonic acid salt, 2-(methacryloyloxy) ethanesulfonic acid, a 2-(methacryloyloxy) ethanesulfonic acid salt, sodium methallyl sulfonate, styrene sulfonate, hydroxyethyl-acrylate phosphate, hydroxypropyl-acrylate phosphate, hydroxyethyl methacrylate phosphate, and/or hydroxypropyl-methacrylate phosphate; a monomer (M4) of formula (II): R 1 and R 2 independently being H or CH 3 , L 1 independently being C(O), CH 2 , CH 2 —CH 2 , or O—CH 2 —CH 2 —CH 2 —CH 2 , L 2 independently being (CH 2 —CH 2 O) x , (CH 2 CH(CH 3 )O) y , and/or (CH(CH 3 )CH 2 O) 2 , and x, y, and z independently being an integer or decimal in a range of from 0 to 150 with a sum of x, y, and z being in a range of from 10 to 150; a compound (M5) of formula (III): R 1 -(EO) m -(PO) n —R 2 (III), m and n independently being 0 or an integer or decimal less than 150 with m or n being different from 0, EO being CH 2 CH 2 O, PO independently being CH(CH 3 ) CH 2 O or CH 2 CH(CH 3 )O, R 1 being a group comprising a polymerizable olefinic unsaturation, and R 2 being a hydrocarbon group comprising from 6 to 40 carbon atoms; a monomer (M6) comprising polyalkylene glycol acrylate, polyalkylene glycol methacrylate, allyl polyalkylene glycol, methallyl polyalkylene glycol, 3-methyl-3-buten-1-ylpolyalkylene glycol, polyalkylene glycol acrylate phosphate, polyalkylene glycol methacrylate phosphate, allyl polyalkylene glycol phosphate, methallyl polyalkylene glycol phosphate, and/or 3-methyl-3-buten-1-ylpolyalkylene glycol phosphate, and/or a monomer (M7) comprising a cross-linking compound and/or a monomer comprising a first and a second olefinic unsaturation.
  5. 5 . The composition of claim 1 , wherein the ose (S1) comprises triose, tetrose, pentose, hexose, deoxyhexose, heptose, and/or octose; wherein the oligomer (S2) comprises an ose dimer and/or an ose trimer; and wherein product (S3) comprises an aldose, a synthetic monosaccharide derivative, and/or synthetic disaccharide derivative.
  6. 6 . The composition of claim 1 , wherein the derivative (S) comprises sorbitol, mannitol, gluconic acid, citric acid, isocitric acid, lactic acid, tartaric acid, dextrose, maltose, glucose, maltose, lactose, sucrose, maltoriose, maltotetraose, alpha-glucoheptonic acid, and/or beta-glucoheptonic acid, optionally in salt form.
  7. 7 . The composition of claim 1 , wherein particles of the mineral material (b) have an average diameter of less than 500 μm; or wherein the mineral material (b) consists of one, two, or three mineral materials.
  8. 8 . The composition of claim 1 , further comprising: (c) a bonding agent comprising starch, carboxymethyl cellulose, hydroxyethyl cellulose, polyvinyl alcohol, casein, a further protein, and/or alginate.
  9. 9 . The composition of claim 1 , further comprising, relative to total aqueous composition mass: (c) a bonding agent in a range of from 2 to 25% by dry mass; (d) a thickening agent in a range of from 0.01 to 2% by dry mass; and the water in a range of from 22.97 to 42.98% by mass.
  10. 10 . The composition of claim 1 , further comprising: a dispersing agent, an antifoaming agent, a biocide, a coloring agent, a lubricant, and/or an optical brightener.
  11. 11 . A method for preparing the aqueous composition of claim 1 , the method comprising: in an aqueous suspension, contacting the aqueous dispersing agent and the mineral material in particle form.
  12. 12 . The composition of claim 1 , configured as a paper coating color composition.
  13. 13 . A method for controlling rheology of an aqueous composition, the method comprising: combining a first aqueous composition and the aqueous dispersing agent to obtain the aqueous composition of claim 1 .
  14. 14 . The agent of claim 1 , wherein the polymer (P) comprises: the first anionic monomer (M1) is present in the polymer (P) in a range of from more than 70 to 99.5 wt. %; and a further monomer in a range of from 0.5 to 30 wt. %.
  15. 15 . An aqueous dispersing agent, comprising: a polymer (P), comprising, in radically polymerized form, a first anionic monomer (M1) comprising acrylic acid, methacrylic acid, and/or itaconic acid, optionally in salt form; and a derivative(S) comprising (S1) an ose comprising from 3 to 8 carbon atoms, (S2) an ose oligomer comprising from 1 to 10 ose units, and/or (S3) a product resulting from degradation of a saccharide, wherein an S/P ratio of dry weight amounts of the derivative(S) to the polymer (P) in the water is in a range of from 0.6 to 10, wherein the first anionic monomer (M1) is present in the polymer (P) in more than 70 wt. %, and wherein the polymer (P) is at least partially neutralized.
  16. 16 . The composition of claim 15 , wherein the first anionic monomer (M1) is present in the polymer (P) in at least 99.5 wt. %.
  17. 17 . The composition of claim 1 , configured as a paper pre-coat formulation, a paper top coat formulation, a paint, a varnish, an ink composition.
  18. 18 . The composition of claim 1 , wherein the aqueous composition has a viscosity of no more than 720 mPa's, measured using a Brookfield RVI viscometer at 100 rpm and 25° C.
  19. 19 . A paper pre-coat formulation, a paper top coat formulation, a paint, a varnish, an ink composition, comprising, relative to total aqueous composition mass: (a) the aqueous dispersing agent of claim 15 in a range of from 0.02 to 2% by dry mass; (b) a mineral material in a range of from 30 to 75% by dry mass; (c) a bonding agent in a range of from 2 to 25% by dry mass; (d) a thickening agent in a range of from 0.01 to 2% by dry mass; and the water in a range of from 22.97 to 42.98% by mass, wherein the mineral agent comprises calcium carbonate, strontium carbonate, magnesium carbonate, barium carbonate, dolomite, kaolin, calcined kaolin, titanium dioxide, iron oxide, talcum, calcium sulfate, barium sulfate, silica, mica, and/or zinc oxide.
  20. 20 . The composition of claim 1 , further comprising: (d) a thickening agent.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present application is the national stage of international application PCT/FR2019/000185, filed on Nov. 14, 2019, and claims the benefit of the filing date of French Appl. No. 1871564, filed on Nov. 16, 2018. DESCRIPTION The invention relates to the field of dispersing agents for an aqueous composition, in particular for dispersing a mineral material in particle form. The dispersing agent according to the invention comprises a dispersing polymer combined with an osidic derivative or a saccharide derivative. The invention also relates to an aqueous composition comprising said dispersing agent and a mineral material in particle form, as well as to the use of said agent or of said composition. An aqueous suspension of a mineral material is a dispersion of slightly soluble or insoluble solid material in an aqueous medium. The desired characteristics of a suspension generally depend on the intended use of this suspension, in particular the use of the mineral material as filler in a composition, for example in a paper coating colour composition or a coating composition. The characteristics of an aqueous dispersion of mineral material in particle form can be controlled, in particular by means of a dispersing agent. The viscosity and stability of the aqueous dispersion are important properties. The origins and properties of the dispersing agents of mineral material in particle form can vary widely. In particular, this agent can be prepared from products of natural origin. It must therefore be possible to develop the use of renewable products. The compatibility of the dispersing agents, in particular with the various elements present in an aqueous dispersion of mineral material in particle form, is also an important property. There are known dispersing agents of mineral material in particle form. However, the known agents do not make it possible to provide satisfactory solutions to the problems encountered when dispersing these materials in an aqueous medium. In particular, dispersing agents do not always have degradation properties, particularly improved biodegradation properties. Dispersing agents must also have a controlled apparent viscosity to facilitate their handling, transport or introduction into an aqueous composition. The reduction of the amounts of admixtures, in particular of dispersing polymers, particularly of synthetic dispersing polymers, used in aqueous compositions must also be sought. Document EP 2044159 describes a method for manufacturing an aqueous suspension of mineral materials using an acrylic acid or methacrylic acid polymer and maleic anhydride. Document U.S. Pat. No. 4,801,354 describes aqueous suspensions of pigments for use in paper manufacturing. They contain a dispersant which is a copolymer of a (meth)acrylic acid ester and of a monohydric or dihydric alcohol as well as of a carboxylic acid. Document WO 2018-109400 describes a method for preparing particles of mineral material by grinding in the presence of water and of a polymer prepared from at least one anionic monomer and sodium hypophosphite or di sodium 2,2′-(thiocarbonylbisthio)dipropanoate. Document WO 2015-063402 relates to the use of a depolymerised carboxylated cellulose solution for grinding or dispersing aqueous suspensions of mineral material. The dispersing agent according to the invention makes it possible to provide a solution to all or part of the problems encountered when using dispersing agents from the prior art. Thus, the invention provides an aqueous dispersing agent comprising: at least one polymer (P) prepared by at least one radical polymerisation reaction, at a temperature greater than 50° C., of at least one anionic monomer (M1) comprising at least one polymerisable olefinic unsaturation and at least one carboxylic acid group or of one of its salts, in the presence of at least one radical-generating compound chosen among hydrogen peroxide, benzoyl peroxide, acetyl peroxide, lauryl peroxide, tert-butyl hydroperoxide, cumene hydroperoxide, ammonium persulphate, an alkali metal persulphate, an azo compound, their respective combinations and associations with an ion chosen among FeII, FeIII, CuI, CuII and combinations thereof;at least one derivative (S) chosen among: an ose (S1) comprising from 3 to 8 carbon atoms;an ose oligomer (S2) comprising from 1 to 10 ose units;a product (S3) resulting from the degradation of a saccharide. According to the invention, the polymer (P) is prepared by at least one radical polymerisation reaction in the presence of at least one radical-generating compound. This compound may in particular be an azo compound, for example an azo compound chosen among 2,2′-azobis(2-(4,5-dihydroimidazolyl)propane, 2,2′-azobis(2-methylpropionamidine) dihydrochloride, diazo-valeronitrile, 4,4′-azobis-(4-cyanovaleric acid), AZDN or 2,2′-azobisisobutyronitrile. Preferably, according to the invention, the radical-generating compound is chosen among