阅读说明：本技术 用于纸张涂料的组合物 (Composition for paper coating ) 是由 弗朗西斯·博尼 克莱芒蒂娜·尚帕涅 弗朗索瓦·杜邦 劳里·帕勒南 让-马克·苏奥 于 2018-12-17 设计创作，主要内容包括：本发明涉及纸张涂料组合物,其包含丙烯酸增稠共聚物、颗粒形式的矿物材料、黏合剂和水。本发明还涉及所述组合物在制备纸张或纸板以提高纸张涂料的保水率的用途。(The present invention relates to a paper coating composition comprising an acrylic thickening copolymer, a mineral material in particulate form, a binder and water. The invention also relates to the use of said composition for the preparation of paper or board for increasing the water retention of a paper coating.)

1. An aqueous composition for preparing a paper color coating comprising:

a) 0.02 to 2% by dry mass of at least one copolymer prepared by polymerization of:

(a1) at least one compound (a1) selected from:

-at least one compound (a1-1) selected from the group consisting of acrylic acid alone, acrylic acid salt alone and combinations thereof, and

-a combination of at least one compound (a1-1) with a compound (a1-2), said compound (a1-2) being selected from methacrylic acid, methacrylate salts and combinations thereof, wherein the weight ratio (a1-1)/(a1-2) is greater than 0.15,

(a2) at least one ester (a2) of an acid selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic anhydride, and

(a3) at least one compound (a3) selected from the group consisting of 2-acrylamido-2-methylpropane sulfonic acid, 2-sulfoethyl methacrylate, sodium methallylsulfonate, styrene sulfonate, salts thereof, and combinations thereof,

b) 30 to 75% by dry mass of at least one mineral material in particulate form,

c) 2 to 25% by dry mass of at least one binder, and

d)22.98 to 44.98 mass% of water.

2. The composition of claim 1, wherein:

the monomer (a1) being the only monomer (a1-1), preferably acrylic acid only, or

The monomer (a1-1) is acrylic acid, or

The monomer (a1-2) is methacrylic acid, or

The weight ratio of (a1-1)/(a1-2) is greater than 0.2 or 0.5, preferably greater than 1 or 2, more preferably greater than 5 or 8, even more preferably greater than 10 or 15, more preferably greater than 20 or 35, still more preferably greater than 50 or 80, or

The weight ratio of (a1-1)/(a1-2) is from 0.2 to 80, preferably from 0.5 to 50, more preferably from 1 to 35, more preferably from 2 to 20, even more preferably from 5 to 15 or from 8 to 10, or

The monomer (a2) is selected from styrene, vinylcaprolactam, alkyl acrylates, in particular acrylic acid C₁To C₁₀Alkyl esters, preferably acrylic acid C₁To C₄Alkyl esters, more preferably methyl acrylate, ethyl acrylate, propyl acrylate, isobutyl acrylate, n-butyl acrylate, alkyl methacrylates, especially C-methacrylic acid₁To C₁₀Alkyl esters, preferably methacrylic acid C₁To C₄Alkyl esters, more preferably methyl methacrylate, ethyl methacrylate, propyl methacrylate, isobutyl methacrylate, n-butyl methacrylate, aryl acrylates, preferably phenyl acrylate, benzyl acrylate, phenoxyethyl acrylate; aryl methacrylates, preferably phenyl methacrylate, benzyl methacrylate, phenoxyethyl methacrylate and combinations thereof, preferably methyl acrylate, ethyl acrylate, isobutyl acrylate, n-butyl acrylate, methyl methacrylate, more preferably methyl acrylate or ethyl acrylate, or

-monomer (a3) is 2-acrylamido-2-methylpropanesulfonic acid.

3. The composition according to claim 1 or 2, wherein copolymer (a) is prepared by polymerization also using:

(a4) at least one compound of formula (I)

R¹-(EO)_m-(PO)_n-R²(I)

Wherein:

-m and n, equal to or different from each other, independently represent 0 or an integer or decimal fraction less than 150, m or n being different from 0,

EO represents CH₂CH₂The radical of O is a radical of,

-PO independently represents a radical selected from CH (CH)₃)CH₂O and CH₂CH(CH₃) Radical of O

-R¹Denotes a group comprising at least one polymerizable ethylenic unsaturation, preferably a group selected from the group consisting of acrylate, methacrylate, urethane acrylate, urethane methacrylate, vinyl, allyl, methallyl and isoprenyl groups, more preferably a methacrylate group,

-R²denotes a linear, branched or cyclic, saturated, unsaturated or aromatic hydrocarbon radical containing from 6 to 40 carbon atoms, preferably a linear or branched C₆To C₄₀Alkyl, preferably straight-chain or branched C₈To C₃₀Alkyl radical, C₆To C₄₀Aryl, preferably C₈To C₃₀Aryl, e.g. tristyrylphenyl, or

(a5) At least one monomer selected from the group consisting of:

polyalkylene glycol acrylates, preferably polyethylene glycol acrylates or polyethylene-polypropylene glycol acrylates,

polyalkylene glycol methacrylate, preferably polyethylene glycol methacrylate or polyethylene-polypropylene glycol methacrylate,

an allyl polyalkylene glycol, preferably allyl polyethylene glycol or allyl polyethylene-polypropylene glycol,

a methallyl polyalkylene glycol, preferably a methallyl polyethylene glycol or a methallyl polyethylene glycol-polypropylene glycol,

3-methyl-3-buten-1-yl polyalkylene glycol, preferably 3-methyl-3-buten-1-yl polyethylene glycol or 3-methyl-3-buten-1-yl polyethylene glycol-polypropylene glycol, or

(a6) At least one crosslinking monomer or at least one monomer comprising at least two ethylenic unsaturations.

4. The composition of any one of claims 1 to 3, wherein:

-the amount by mass of the monomer (a1-1) is larger than the amount by mass of the monomer (a 1-2); it is preferable that the amount by mass of the monomer (a1-1) is at least 1.5 times, 2 times, 3 times, 4 times, 5 times, 8 times, 10 times, or more than the amount by mass of the monomer (a1-2)

-monomer (a4) is a compound of formula (I) wherein:

o m denotes an integer or decimal number from 20 to 40, n is 0, or

o m and n independently represent an integer or decimal from 5 to 100, or

o m/n in a mass ratio of 90/10 to 70/30.

5. The composition of any one of claims 1 to 4, wherein the copolymer comprises:

20 to 69% by mass of monomer (a1),

-30 to 79 mass% of monomer (a2), and

1 to 5% by mass of monomer (a 3).

6. The composition of any one of claims 3 to 5, wherein the copolymer comprises:

20 to 69% by mass of monomer (a1),

29.5 to 78.5% by mass of monomer (a2),

1 to 5% by mass of the monomer (a3), and

-0.5 to 30 mass% of monomer (a 4).

7. The composition of any one of claims 3 to 6, wherein the copolymer comprises:

20 to 69% by mass of monomer (a1),

29.5 to 78.5% by mass of monomer (a2),

1 to 5% by mass of the monomer (a3), and

-0.5 to 30 mass% of monomer (a 5).

8. The composition of any one of claims 3 to 7, wherein the copolymer comprises:

19.9 to 68.9% by mass of a monomer (a1),

-from 30 to 79 mass% of monomer (a2),

1 to 5% by mass of the monomer (a3), and

-0.1 to 5 mass% of monomer (a 6).

9. The composition of any one of claims 3 to 8, wherein the copolymer comprises:

15 to 69 mass% of monomer (a1),

29 to 83 mass% of monomer (a2),

1 to 5% by mass of monomer (a3),

-0.5 to 30 mass% of monomer (a4), and

-0.5 to 30 mass% of monomer (a 5).

10. The composition of any one of claims 3 to 9, wherein the copolymer comprises:

19.9 to 68.9% by mass of a monomer (a1),

29.5 to 78.5% by mass of a monomer (a2),

1 to 5% by mass of monomer (a3),

-0.5 to 30 mass% of monomer (a4), and

-0.1 to 5 mass% of monomer (a 6).

11. The composition of any one of claims 3 to 10, wherein the copolymer comprises:

19.9 to 68.9% by mass of a monomer (a1),

29.5 to 78.5% by mass of a monomer (a2),

1 to 5% by mass of monomer (a3),

-0.5 to 30 mass% of monomer (a5), and

-0.1 to 5 mass% of monomer (a 6).

12. The composition of any one of claims 3 to 11, wherein the copolymer comprises:

19.9 to 68.9% by mass of a monomer (a1),

29 to 78 mass% of monomer (a2),

1 to 5% by mass of monomer (a3),

0.5 to 30% by mass of monomer (a4),

-0.5 to 30 mass% of monomer (a5), and

-0.1 to 5 mass% of monomer (a 6).

13. The composition according to any one of claims 1 to 12, wherein:

-the mineral material particles have a size of less than 50 μm, or from 0.05 μm to 50 μm, or less than 10 μm, preferably less than 5 μm or 2 μm, more preferably less than 1 μm or less than 0.5 μm, or

-particles of mineral material having an equivalent spherical diameter size of between 0.05 μm and 50 μm or less than 50 μm, preferably less than 10 μm, more preferably less than 5 μm or 2 μm, even more preferably less than 1 μm or 0.5 μm, equal to 60% by weight, or equal to 70% by weight, or even equal to 80% by weight, or even equal to 90% by weight.

14. The composition of any one of claims 1 to 13, wherein:

use of a single mineral material (b) or two or three mineral materials (b), or

-the mineral material (b) is of synthetic or natural origin, preferably selected from alkaline earth metal carbonates, preferably calcium carbonate (natural or precipitated), strontium carbonate, magnesium carbonate, barium carbonate, dolomite, kaolin, titanium dioxide, talc, lime, calcium sulfate, barium sulfate, silica; more preferably calcium carbonate (natural or precipitated) or kaolin.

15. The composition according to any one of claims 1 to 14, wherein the binder (c) is a natural binder, such as starch, carboxymethylcellulose (CMC), hydroxyethylcellulose, polyvinyl alcohol (PV-OH), casein, proteins, alginates, or a synthetic binder, such as latex, preferably selected from styrene-butadiene polymers, styrene-acrylic acid polymers, styrene-acetate polymers, more preferably styrene-butadiene polymers.

16. The composition according to any one of claims 1 to 15, further comprising at least one additive, in particular at least one additive selected from dispersants, defoamers, biocides, colorants, lubricants and optical brighteners.

17. A process for the preparation of paper or paperboard comprising using an aqueous composition according to any one of claims 1 to 16; preferably, the composition is used in one or more than one paper or paperboard coating step.

18. The method according to claim 17, wherein the composition has an increased water retention in the paper coating step; preferably, the water retention of the composition is increased from 50 to 400 volume% compared to when no copolymer (a) is used.

19. The method according to claim 17 or 18, wherein the composition has a low shear viscosity (Brookfield viscosity at 100 rpm) sufficient and compatible with the coating process and higher than a composition without the copolymer; preferably, the viscosity under low shear (Brookfield viscosity at 100 rpm) is from 150 to 3500 mpa.s.

20. The method according to any one of claims 17 to 19, wherein the composition is deposited on the surface of paper or paperboard in at least one coating step, the dried coating weight being from 5 to 50g/m²Preferably 8 to 40g/m²。

Examples