Binder for carpet coating compositions

Patent metadata

Field	Value
Publication number	US-11220783-B2
Application number	US-201615776302-A
Country	US
Kind code	B2
Filing date	Nov 9, 2016
Priority date	Nov 24, 2015
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

The object of the invention is the use of an aqueous dispersion of a vinylacetate-ethylene-copolymer and of at least one polyethylene imine as a binder in a carpet coating composition for the production of carpets.

First claim

The invention claimed is:

1. A method of producing a carpet, comprising the steps of:
a. applying a carpet coating composition comprising as binders an aqueous dispersion of a vinyl acetate-ethylene copolymer and at least one polyethyleneimine to either or both of:
i. a reverse side of a carpet pile comprising carpet fibers inserted into a woven or laid primary backing; or
ii. a secondary carpet backing comprising woven natural or synthetic fibers; and

b. attaching the carpet pile to the secondary carpet backing,
wherein the vinyl acetate-ethylene copolymer is stabilized by at least one emulsifier and/or at least one polyvinyl alcohol protective colloid, wherein the polyvinyl alcohol or polyvinyl alcohols consist of partially hydrolyzed polyvinyl alcohols having an 80 to 95 mol % degree of hydrolysis and a Hoeppler viscosity in 4% aqueous solution of 1 to 40 mPas.

2. The method of claim 1 , further comprising forming the vinyl acetate-ethylene copolymer by radical-initiated emulsion polymerization of 60 to 98 wt % of vinyl acetate and 2 to 30 wt % of ethylene, based in each case on the total weight of the comonomers, in an aqueous medium, the particulars in wt % adding up to 100 wt % in each case.

3. The method of claim 1 , wherein the emulsion polymerization of the vinyl acetate-ethylene copolymer takes place in the presence of a protective colloid, in the presence of an emulsifier, or in the presence of a protective colloid and an emulsifier.

4. The method of claim 1 , wherein the polyethyleneimine has a weight-average molecular weight of 500 g/mol to 1,000,000 g/mol.

5. The method of claim 4 , wherein the polyethyleneimine has a weight-average molecular weight of 10,000 g/mol to 1,000,000 g/mol.

6. The method of claim 1 , wherein the polyethyleneimine is included in the carpet coating composition in an amount of 0.1 to 10 wt %, based on the dry weight of the vinyl acetate-ethylene copolymer.

7. The method of claim 1 , wherein the carpet coating composition comprises:
an aqueous dispersion of a vinyl acetate-ethylene copolymer;
0.1 to 10 wt % of at least one polyethyleneimine, based on the dry weight of the vinyl acetate-ethylene copolymer (dry/dry);
100 to 1400 wt % of fillers, based on the dry weight of the vinyl acetate-ethylene copolymer (dry/dry);
water;
optionally one or more additives; and
optionally one or more adjuvants,
wherein the fillers consist of one or more selected from the group consisting of kaolin, talc, fluorspar, fly ash, aluminum trihydrate, and chalk.

8. The method of claim 1 , wherein the carpets are tufted carpets, woven carpets, or needlefelt carpets.

Assignees

• Wacker Chemie Ag

Inventors

• Melchin Timo
• Kögler Gerhard
• Künstle Holger

Classifications

• D06N7/0063

  Floor covering on textile basis comprising a fibrous top layer being coated at the back with at least one polymer layer, e.g. carpets, rugs, synthetic turf · CPC title

• D06N2203/045

  Vinyl (co)polymers · CPC title

• D06N7/0086

  characterised by the cushion backing, e.g. foamed polyurethane · CPC title

• D06N7/0073 Primary

  the back coating or pre-coat being applied as an aqueous dispersion or latex · CPC title

• C09D123/0853

  Vinylacetate · CPC title