Use of a polymer dispersion as dust control agent

Patent metadata

Field	Value
Publication number	US-9803121-B2
Application number	US-201314395262-A
Country	US
Kind code	B2
Filing date	Apr 12, 2013
Priority date	Apr 17, 2012
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

The present invention relates to the use of polymer dispersions for dust control, wherein these polymer dispersions can be obtained by radically initiated emulsion polymerisation of the components a to e: a. 2-75% by weight styrene and/or substituted styrene and b. 0 to 75% by weight acrylic acid C1-C2 ester and/or methacrylic acid C1 to C12 ester and c. 0 to 50% by weight acrylonitrile and/or methacrylonitrile and d. 0 to 50% by weight of at least one further copolymerisable ethylenically unsaturated monomers with one or more C—C double bonds in the presence of e. 10 to 7% by weight starch and/or modified starch and/or degraded starch and/or degrated modified starch wherein the polymerisation is carried out in water.

First claim

The invention claimed is:

1. A method of controlling dust comprising: applying to a substrate, which is to be treated, a polymer dispersion as a dust control agent, wherein the polymer dispersion is prepared by free radical initiated emulsion polymerization of:
a. 2 to 75% by weight of styrene and/or substituted styrene,
b. 0 to 75% by weight of C1 to C12 esters of acrylic acid and/or C1 to C12 esters of methacrylic acid,
c. 0 to 50% by weight of acrylonitrile and/or methacrylonitrile;
d. 0 to 50% by weight of at least one further copolymerizable, ethylenically un-saturated monomer with one or more carbon-carbon double bonds, and
e. 10 to 75% by weight of starch and/or modified starch and/or degraded starch and/or degraded modified starch;
wherein components a to e are polymerized in water, the sum of a+b+c+d+e being 100% by weight and the ratio of water to the sum of components a to e being 99:1 to 40:60 by weight; and
wherein, when the monomer in group d has more than one carbon-carbon double bond, the monomer is selected from the group consisting of methylene bisacrylamide, polyalkylene glycol di(meth)acrylates, and triallylamine.

2. The method of claim 1 , wherein the substrate, which is to be treated, is any type of dusting solid.

3. The method of claim 1 , wherein the concentration of the aqueous dispersion is 0.5 to 3% when applied.

4. The method of claim 1 , wherein the polymer dispersion dust control agent is applied in an amount of 0.2 to 3 L per m 2 of the surface to be treated.

5. The method of claim 1 , wherein the polymer dispersion has a solids content of at least 10% by weight, a viscosity of not more than 1000 mPas and a pH of 1 to 11, and the average size of the polymer particles is less than 1 μm.

6. The method of claim 1 , wherein component a is styrene, and this is optionally used in combination with n-butyl acrylate and/or t-butyl acrylate and/or acrylonitrile and/or acrylic acid as monomers b to d.

7. The method of claim 1 , wherein a degraded native and/or a degraded modified starch with a molecular weight of 1000 to 50,000 D is used as starch.

8. The method of claim 1 , wherein the proportion of starch to the monomers a to d is 20% to 500% by weight.

9. The method of claim 5 , wherein the polymer dispersion has a pH of 2 to 9.

10. The method of claim 1 , wherein the polymer dispersion is in the form of an aqueous dispersion and applying comprises homogenously spraying the aqueous dispersion onto the surface of or into a substrate which is to be treated.

Assignees

• Bk Giulini Gmbh
• Kurita Water Ind Ltd

Inventors

• Urschey Michael
• Lunkenheimer Rudolf
• Stephan Tim

Classifications

• C08F251/00

  Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof · CPC title

• C09K3/22 Primary

  for dust-laying or dust-absorbing · CPC title

• C08F220/18

  with acrylic or methacrylic acids · CPC title

• C08F212/08

  Styrene · CPC title

• C08F220/34

  Esters containing nitrogen {, e.g. N,N-dimethylaminoethyl (meth)acrylate} · CPC title