Paper coating compositions

A composition and paper technology, applied in the direction of paper coating, papermaking, coating, etc., can solve problems such as rough surface

Inactive Publication Date: 2013-10-23
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fibrous substrates such as paper have relatively rough surfaces

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The autoclave is charged with 850g water, 8.8g MA-80-I (sodium dihexyl sulfosuccinate), 0.5g sodium acetate, 5.0g 1% ferrous ammonium sulfate solution. The pH of the feed was adjusted to 4.2 with 1.1 g of acetic acid. Stirring was started and 262.5 g of vinyl acetate was added.

[0038] After the initial charge, the reactor was purged with nitrogen, then with ethylene, and heated to 55°C with stirring, followed by the charge of 400 g of ethylene. To initiate the polymerization, a 6% sodium persulfate solution was fed at 0.5 g / min and a 3.6% sodium erythorbate solution was additionally fed at 0.5 g / min. When there was evidence of an exotherm, two additional feeds were started: 1277.5 g of vinyl acetate over 150 minutes, and a uniform feed of 187.2 g of water, 38.7 g of L64 (ethylene oxide / propylene oxide block copolymer supplied by BASF), 38.7 g 2403 (a 50% solution of acrylamidomethyl propane sulfonate sodium salt supplied by Lubrizol), 19.5 g of acrylic acid and...

Embodiment 2

[0045] The autoclave is charged with 900g water, 10.5g MA-80-I (sodium dihexyl sulfosuccinate), 0.5g sodium acetate, 5.0g 1% ferrous ammonium sulfate solution. The pH of the feed was adjusted to 4.2 with 1.1 g of acetic acid. Stirring was started and 354 g of vinyl acetate was added.

[0046] After the initial charge, the reactor was purged with nitrogen, then with ethylene, and heated to 55°C with stirring, followed by the charge of 400 g of ethylene. To initiate the polymerization, a 3% sodium persulfate solution was fed at 0.5 g / min and a 1.8% sodium erythorbate solution was additionally fed at 0.5 g / min. When there was evidence of an exotherm, two additional feeds were started: 1061 g of vinyl acetate was added over 120 minutes, and a mixture of 314.2 g of water, 16.7 g of RS-610 (phosphate ester of tridecyl alcohol ethoxylate supplied by Rhodia), 16.7 g L64 (ethylene oxide / propylene oxide block copolymer supplied by BASF), 16.7 g 2403 (a 50% solution of acrylamid...

Embodiment 3

[0053] According to the method and steps of Example 2, except that the aqueous feed is adjusted to contain: 281.3g water, 66.8g TLA4050 (50% solution of tridecyl alcohol ethoxylate with 40 moles of ethylene oxide supplied by Rhodia), 16.7 g 2403 (50% solution of sodium salt of acrylamidomethyl propane sulfonate supplied by Lubrizol), 16.7 g of acrylic acid and 15.5 g of 7% ammonium hydroxide.

[0054] Additionally, the 3% sodium persulfate solution was adjusted to contain 2% sodium bicarbonate.

[0055]As in Example 1, the addition rates of sodium persulfate and sodium erythorbate were adjusted over time in an attempt to obtain a uniform conversion distribution. The two additions were terminated 165 minutes after an initial exotherm was observed when 150 g of each solution had been added.

[0056] After the end of the feed, the remaining conditions were the same as in Example 1.

[0057] The physical property of gained latex is:

[0058]

[0059] Estimated polymer com...

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Abstract

A composition for coating paper includes at least one pigment selected from the group consisting of polymeric pigments, aluminosilicates, calcium carbonate, titanium dioxide, talc, barium sulfate, zinc oxide, aluminum trihydrate, amorphous silica and silicates; wherein the pigment is dispersed in an aqueous dispersion of a polymeric binder that is a copolymer of vinyl acetate, ethylene, at least one ethylenically unsaturated sulfonic acid or salt thereof and optionally one or more other monomers, wherein vinyl acetate units constitute in a range of 70-90 wt % of the polymeric binder and ethylene units constitute in a range of 10-30 wt % of the polymeric binder; and wherein the polymeric binder has a mean particle size in a range from 0.1 μm to 0.3 μm and the optional one or more other monomers do not include any N—(C1-4) alkylol (meth)acrylamide; and wherein the aqueous dispersion of the polymeric binder is free of alkylphenol ethoxylate surfactants and includes a nonionic surfactant component consisting of a polyethylene oxide / polypropylene oxide block copolymer and optionally one or more other nonionic surfactants, and optionally includes an anionic surfactant component consisting of one or more anionic surfactants.

Description

Background technique [0001] Pigmented paper coating formulations generally comprise an aqueous synthetic polymer binder emulsion and one or more pigments, and may contain other additives commonly used in the art. Exemplary polymeric binders include vinyl acetate-ethylene (VAE) copolymers, optionally including other comonomers. Traditional binders for paper coatings typically employ alkylphenol ethoxylate (APE) surfactants for dispersion stability. However, recent regulatory trends have limited the use of this surfactant due to suspected health risks. Therefore, a paper coating composition free of alkylphenol ethoxylates would be of commercial interest. [0002] One of the most important tasks of paper and cardboard is to function as a printing carrier. However, fibrous substrates, such as paper, have relatively rough surfaces. To improve their printability, and their qualities in smoothness, gloss, and especially in order to increase whiteness, it is necessary to coat the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D131/04D21H19/56D21H19/58D21H19/60D21H19/62
CPCD21H19/58D21H19/62C08L41/00C09D123/0853C08K3/0033D21H19/60D21H19/56C08K3/013Y10T428/31906C09D131/04
Inventor C·L·丹尼尔斯J·R·博伊兰
Owner WACKER CHEM GMBH
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