# US 11,897,982 B2 · Water-based polymer dispersions and uses thereof

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,897,982 B2
- Document ID: US11897982B2
- Status: Granted
- Kind: B2
- Application number: 16/969,684
- Filed: 2018-02-13
- Published: 2021-01-07
- Granted: 2024-02-13
- Earliest claimed: 2018-02-13
- Assignees: Wacker Chemie AG
- Applicants: Wacker Chemie AG; Jin Zheng
- Inventors: Jin Zheng; Lingyun Huang; Yun Li; Haoqing Sun; Jiyang Zhang
- Web page: https://patentgrep.com/patent/US11897982B2

## CPC

- C08F 220/285: {and containing a polyether chain in the alcohol moiety}
- C08L 31/04: Homopolymers or copolymers of vinyl acetate
- C04B 24/2623: {Polyvinylalcohols; Polyvinylacetates}
- C04B 24/2647: {containing polyether side chains}
- C04B 24/2652: {Nitrogen containing polymers, e.g. polyacrylamides, polyacrylonitriles}
- C04B 28/04: Portland cements
- C04B 40/0039: {Premixtures of ingredients}
- C08L 29/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- C08L 33/14: of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
- C08L 33/26: Homopolymers or copolymers of acrylamide or methacrylamide
- C08L 71/02: Polyalkylene oxides
- C04B 2111/00094: {Sag-resistant materials}
- C08L 2201/50: Aqueous dispersion, e.g. containing polymers with a glass transition temperature (Tg) above 20°C
- C08L 2201/54: Aqueous solutions or dispersions
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08L 2205/035: containing four or more polymers in a blend
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE

## Abstract

Vinyl ester/ethylene copolymer aqueous dispersions containing an anionic polyacrylamide, at least one polyvinyl alcohol, and optionally a non-ionic surfactant, are useful in cementitious compositions as polymer additives.

## Claims

### Claim 1

An aqueous polymer dispersion, comprising:
i) a copolymer prepared by the polymerization of comonomers comprising a vinyl ester and ethylene,
ii) an anionic polyacrylamide,
iii) a polyvinyl alcohol, and
iv) water,
wherein the anionic polyacrylamide is present in an amount of at least 0.15 wt. %, based on the total weight of the vinyl ester and ethylene monomers.

### Claim 2 (depends on 1)

The aqueous polymer dispersion of claim 1, wherein the anionic polyacrylamide is present in an amount of 0.15 to 0.45 wt. %.

### Claim 3 (depends on 1)

The aqueous polymer dispersion of claim 1, wherein further comonomers are polymerized in an amount of less than 5 wt % based on the total weight of the vinyl ester and ethylene monomers.

### Claim 4 (depends on 1)

The aqueous polymer dispersion of claim 1, wherein the number average molecular weight of the anionic polyacrylamide is from 1×105 to 1×107 g/mol.

### Claim 5 (depends on 1)

The aqueous polymer dispersion of claim 1, wherein the aqueous polymer dispersion further comprises a nonionic surfactant with an HLB value of from 13 to 20.

### Claim 6 (depends on 5)

The aqueous based polymer dispersion of claim 5, wherein the nonionic surfactant are C4-C40 alkyl alcohol ethoxylates having 10 to 60 EO units.

### Claim 7 (depends on 5)

The aqueous polymer dispersion of claim 5, wherein the nonionic surfactants are present in an amount of from 0.2 to 0.8 wt %, based on the total weight of the vinyl ester and ethylene monomers.

### Claim 8 (depends on 1)

The aqueous polymer dispersion of claim 1, wherein the polyvinyl alcohol comprises at least one medium molecular weight polyvinyl alcohol and at least one low molecular weight polyvinyl alcohol, wherein the medium molecular weight polyvinyl alcohol is a polyvinyl alcohol having a Hoppler viscosity, in 4 wt % aqueous solution, of from 10 to 35 mPa·s as measured at 20° C. according to DIN 53015, and
the low molecular weight polyvinyl alcohol is a polyvinyl alcohol having a Hoppler viscosity, in 4 wt % aqueous solution, of from 3 to less than 10 mPa·s as measured at 20° C. according to DIN 53015.

### Claim 9 (depends on 8)

The aqueous polymer dispersion of claim 8, wherein the medium molecular weight polyvinyl alcohol comprises a first medium molecular weight polyvinyl alcohol and a second medium molecular weight polyvinyl alcohol,
wherein the first medium molecular weight polyvinyl alcohol has a Hoppler viscosity, in 4 wt% aqueous solution, of from 20 to 30 mPa·s as measured at 20° C. according to DIN 53015, and
the second medium molecular weight polyvinyl alcohol has a Hoppler viscosity, in 4 wt % aqueous solution, of from 10 to less than 20 mPa·s as measured at 20° C. according to DIN 53015.

### Claim 10 (depends on 8)

The aqueous polymer dispersion of claim 8, wherein the mass ratio of the medium molecular weight polyvinyl alcohol to the low molecular weight polyvinyl alcohol is 0.6 to 2.5:1.

### Claim 11 (depends on 8)

The aqueous polymer dispersions of claim 8, wherein the polyvinyl alcohol is present in an amount of from 2 to 8 wt %, based on the total weight of the vinyl ester and ethylene monomers.

### Claim 12 (depends on 1)

The aqueous polymer dispersion of claim 1, wherein the anionic polyacrylamide is added after the polymerization is completed.

### Claim 13 (depends on 5)

The aqueous polymer dispersion of claim 5, wherein the mass ratio of the nonionic surfactant to the anionic polyacrylamide is 0.5 to 1.5:1 when the nonionic surfactant is added after the polymerization is completed, and
the mass ratio of the nonionic surfactant to the anionic polyacrylamide is 0.3-1.2:1 when the nonionic surfactant is added prior to the initiation of the polymerization.

### Claim 14 (depends on 8)

The aqueous polymer dispersion of claim 8, wherein all polyvinyl alcohols are added prior to the initiation of the polymerization.

### Claim 15 (depends on 1)

A polymer modified cement-based coating containing an aqueous polymer dispersion of claim 1.

### Claim 16 (depends on 1)

A polymer modified cement composition comprising liquid and powder components, characterized in that the liquid component comprises an aqueous polymer dispersion of claim 1.