# US 2021/0340436 A1 · Polymer dispersion by controlled radical polymerization

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

- Number: US 2021/0340436 A1
- Document ID: US20210340436A1
- Status: Published application
- Kind: A1
- Application number: 17/284,393
- Filed: 2018-10-11
- Published: 2021-11-04
- Earliest claimed: 2018-10-11
- Assignees: Rhodia Operations
- Applicants: Rhodia Operations
- Inventors: Zhenxing Cheng; Zhihua Zhang; Man Chen; Chee Fei Chin; David James Wilson
- Web page: https://patentgrep.com/patent/US20210340436A1

## CPC

- C09K 8/035: Organic additives
- C09K 8/887: {containing cross-linking agents}
- C09K 8/588: characterised by the use of specific polymers {(polymeric surfactants C09K8/584)}
- C09K 8/68: containing organic compounds
- C09K 8/88: macromolecular compounds
- C09K 2208/28: Friction or drag reducing additives
- C09K 2208/34: Lubricant additives
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

Disclosed is a polymer dispersion prepared by controlled radical polymerization and a use of the polymer dispersion as a friction reducer in oil field processes.

## Claims

### Claim 1

A polymer dispersion comprising:
a) 2 to 30 weight percentage of a water soluble copolymer;
b) 10 to 50 weight percentage of a water soluble salt;
c) 0 to 5 weight percentage of a polyol; and
d) water;
weight percentages are based on total weight of the polymer dispersion;
wherein said copolymer is obtained by a process comprising the steps of-:
(A) an ionic charged polymeric dispersant is prepared from at least an ionic monomer in the presence of a radical polymerization control agent to obtain a living polymer,
(B) said living polymer is charged into an aqueous solution comprising a nonionic monomer, and optionally an ionic monomer, the mixture is then subject to continuous polymerization to obtain said copolymer.

### Claim 2 (depends on 1)

The polymer dispersion according to claim 1, wherein said radical polymerization control agent is a compound bearing a thiocarbonylthio group —S(C═S).

### Claim 3 (depends on 1)

The polymer dispersion according to claim 1, wherein said radical polymerization control agent is according to general formula (I):
wherein: Z represents:
a hydrogen atom,
a chlorine atom,
an optionally substituted alkyl or optionally substituted aryl radical,
an optionally substituted heterocycle,
an optionally substituted alkylthio radical,
an optionally substituted arylthio radical,
an optionally substituted alkoxy radical,
an optionally substituted aryloxy radical,
an optionally substituted amino radical,
an optionally substituted hydrazine radical,
an optionally substituted alkoxycarbonyl radical,
an optionally substituted aryloxycarbonyl radical,
an optionally substituted carboxyl or acyloxyl radical,
an optionally substituted aryloxy radical,
an optionally substituted carbamoyl radical,
a cyano radical,
a dialkyl- or diaryl-phosphonato radical,
a dialkyl-phosphinato or diaryl-phosphinato radical, or
a polymer chain;
and R1 represents:
an optionally substituted alkyl, acyl, aryl, aralkyl, alkene or alkyne group,
a saturated or unsaturated, aromatic, optionally substituted carbocycle or
heterocycle, or
a polymer chain.

### Claim 4 (depends on 1)

The polymer dispersion according to claim 1, wherein said radical polymerization control agent is a compound chosen from the group consisting of xanthate, trithiocarbonate, dithiocarbamate and dithiocarbazate.

### Claim 5

A polymer dispersion comprises:
a) 2 to 30 weight percentage of a water soluble copolymer;
b) 10 to 50 weight percentage of a water soluble salt;
c) 0 to 5 weight percentage of a polyol; and
d) water;
weight percentages are based on total weight of the polymer dispersion;
wherein said copolymer comprises (i) a block of an ionic charged polymeric dispersant at one terminal; and (ii) a block of a nonionic monomer, optionally containing an ionic monomer.

### Claim 6 (depends on 5)

The polymer dispersion according to claim 5, wherein said ionic charged polymeric dispersant is an anionic charged polymeric dispersant prepared from at least an anionic monomer according to general formula (II):
wherein:
R3 is a hydrogen or a C1 to C5 alkyl or hydroxyalkyl;
R4 and R5, independently, is a hydrogen or a C1 to C5 alkyl or hydroxyalkyl.

### Claim 7 (depends on 5)

The polymer dispersion according to claim 5, wherein said nonionic monomer is according to general formula (III):
wherein:
R3 is a hydrogen or a C1 to C5 alkyl or hydroxyalkyl;
R4 and R5, independently, is a hydrogen or a C1 to C5 alkyl or hydroxyalkyl.

### Claim 8 (depends on 1)

A method for reducing friction resulting from turbulent flow in an aqueous fracturing fluid in an oil field fracturing process comprising adding to the aqueous fracturing fluid an effective friction-reducing amount of the polymer dispersion according to claim 1.

### Claim 9 (depends on 5)

A method for reducing friction resulting from turbulent flow in an aqueous fracturing fluid in an oil field fracturing process comprising adding to the aqueous fracturing fluid an effective friction-reducing amount of the polymer dispersion according to claim 5.

### Claim 10 (depends on 9)

The method according to claim 9, wherein said ionic charged polymeric dispersant is an anionic charged polymeric dispersant prepared from at least an anionic monomer according to general formula (II):
wherein:
R2 is a hydrogen or a C1 to C5 alkyl or hydroxyalkyl;
M is hydrogen, an alkali metal ion, or NH4+, or NR4+ wherein R is a C1 to C5 alkyl or hydroxyalkyl.

### Claim 11 (depends on 9)

The method according to claim 9, wherein said nonionic monomer is according to general formula (III):
wherein:
R3 is a hydrogen or a C1 to C5 alkyl or hydroxyalkyl;
R4 and R5, independently, is a hydrogen or a C1 to C5 alkyl or hydroxyalkyl.

### Claim 12 (depends on 8)

The method according to claim 8, wherein said polymer dispersion is added to said aqueous fracturing fluid in an amount of from 100 to 2500 ppm.