Stable polyacrylic acids, their manufacture and their use

Patent metadata

Field	Value
Publication number	US-10889661-B2
Application number	US-201113328895-A
Country	US
Kind code	B2
Filing date	Dec 16, 2011
Priority date	Dec 17, 2010
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

A polymer and methods of producing the polymer for use, for instance, in mineral processing, including kaolin and calcium carbonate beneficiation are discussed. The method of producing the polymer can include polymerizing at least one monomer in the presence of a polymerization initiator, a chain transfer agent, and a polymerization stabilizer to produce a polymer containing at least one carboxylic acid, wherein the at least one monomer includes an unsaturated carboxylic acid monomer, and wherein the polymer containing at least one carboxylic acid is stable and has a molecular weight of about 1000 g/mol to about 10,000 g/mol.

First claim

What is claimed is:

1. An aqueous composition comprising:
(1) a homopolymer selected from the group consisting of:
(a) a homopolymer of acrylic acid, having a molecular weight (Mw) of about 2000 g/mol and a polydispersity of 1.8;
(b) a homopolymer of acrylic acid, having a molecular weight (Mw) of about 5000 g/mol and a polydispersity of 1.8; and
(c) a homopolymer of acrylic acid, having a molecular weight (Mw) of about 8000 g/mol and a polydispersity of 1.9,

wherein the homopolymer is in acid form and has not been neutralized, and is characterized by superior rheological performance in a mineral slurry relative to a reference homopolymer of acrylic acid of comparable molecular weight and polydispersity, wherein the reference homopolymer is a fully neutralized polymer;
and
(2) a filler selected from kaolin, talc, clay, white carbon, aluminum hydroxide, titanium dioxide, calcium carbonate, calcite, marble, or a mixture thereof,
wherein the aqueous composition is a slurry.

2. The aqueous composition of claim 1 , wherein the filler is kaolin, talc, clay, white carbon, aluminum hydroxide, titanium dioxide, calcium carbonate, calcite, or marble.

3. A method of mineral processing comprising:
adding a homopolymer of acrylic acid to an aqueous solution containing a filler to form an aqueous slurry,
wherein the homopolymer is selected from group consisting of:
(a) a homopolymer of acrylic acid, having a molecular weight (Mw) of about 2000 g/mol and a polydispersity of 1.8;
(b) a homopolymer of acrylic acid, having a molecular weight (Mw) of about 5000 g/mol and a polydispersity of 1.8; and
(c) a homopolymer of acrylic acid, having a molecular weight (Mw) of about 8000 g/mol and a polydispersity of 1.9,
wherein the homopolymer is in acid form and has not been neutralized, and is characterized by superior rheological performance in a mineral slurry relative to a reference homopolymer of acrylic acid of comparable molecular weight and polydispersity, wherein the reference homopolymer is a fully neutralized polymer, and
wherein the filler is selected from kaolin, talc, clay, white carbon, aluminum hydroxide, titanium dioxide, calcium carbonate, calcite, marble, or a mixture thereof.

4. The aqueous composition of claim 1 , wherein the polymer is a homopolymer of acrylic acid, having a molecular weight (Mw) of about 2000 g/mol and a polydispersity of 1.8.

5. The aqueous composition of claim 1 , wherein the polymer is a homopolymer of acrylic acid, has a molecular weight (Mw) of about 5000 g/mol and a polydispersity of 1.8.

6. The aqueous composition of claim 1 , wherein the polymer is a homopolymer of acrylic acid, having a molecular weight (Mw) of about 8000 g/mol and a polydispersity of 1.9.

7. The method of mineral processing according to claim 3 , wherein the filler is kaolin, talc, clay, white carbon, aluminum hydroxide, titanium dioxide, calcium carbonate, calcite, or marble.

8. A method of manufacturing paper comprising:
providing a aqueous composition comprising
(1) a homopolymer selected from the group consisting of:
(a) a homopolymer of acrylic acid, having a molecular weight (Mw) of about 2000 g/mol and a polydispersity of 1.8;
(b) a homopolymer of acrylic acid, having a molecular weight (Mw) of about 5000 g/mol and a polydispersity of 1.8; and
(c) a homopolymer of acrylic acid, having a molecular weight (Mw) of about 8000 g/mol and a polydispersity of 1.9,

wherein the homopolymer is in acid form and has not been neutralized, and is characterized by superior rheological performance in a mineral slurry relative to a reference homopolymer of acrylic acid of comparable molecular weight and polydispersity, wherein the reference homopolymer is a fully neutralized polymer;
and
(2) a filler, wherein the filler is kaolin, calcium carbonate, or marble wherein the aqueous composition is a slurry.

9. A method of manufacturing ceramics comprising:
providing a aqueous composition comprising
(1) a homopolymer selected from the group consisting of:
(a) a homopolymer of acrylic acid, having a molecular weight (Mw) of about 2000 g/mol and a polydispersity of 1.8;
(b) a homopolymer of acrylic acid, having a molecular weight (Mw) of about 5000 g/mol and a polydispersity of 1.8; and
(c) a homopolymer of acrylic acid, having a molecular weight (Mw) of about 8000 g/mol and a polydispersity of 1.9,

wherein the homopolymer is in acid form and has not been neutralized, and is characterized by superior rheological performance in a mineral slurry relative to a reference homopolymer of acrylic acid of comparable molecular weight and polydispersity, wherein the reference homopolymer is a fully neutralized polymer;
and
(2) a filler, wherein the filler is clay wherein the aqueous composition is a slurry.

10. A method of manufacturing paints comprising:
providing a aqueous composition comprising
(1) a homopolymer selected from the group consisting of:
(a) a homopolymer of acrylic acid, having a molecular weight (Mw) of about 2000 g/mol and a polydispersity of 1.8;
(b) a homopolymer of acrylic acid, having a molecular weight (Mw) of about 5000 g/mol and a polydispersity of 1.8; and
(c) a homopolymer of acrylic acid, having a molecular weight (Mw) of about 8000 g/mol and a polydispersity of 1.9,

wherein the homopolymer is in acid form and has not been neutralized, and is characterized by superior rheological performance in a mineral slurry relative to a reference homopolymer of acrylic acid of comparable molecular weight and polydispersity, wherein the reference homopolymer is a fully neutralized polymer;
and
(2) a filler, wherein the filler is calcium carbonate wherein the aqueous composition is a slurry.

Assignees

• Da Silva Luiz Antonio M
• Da Silva Juraci Marques
• Da Silva Adilson Ignacio
• Porto Junior Antonio Severo
• Basf Se

Inventors

• Da Silva Luiz Antonio M
• Da Silva Juraci Marques
• Da Silva Adilson Ignacio
• Porto Junior Antonio Severo

Classifications

• D21H17/19

  by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• C08F16/36

  by a ketonic radical · CPC title

• C08F20/06 Primary

  Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof · CPC title

• C08K3/34

  Silicon-containing compounds · CPC title

• C08L33/04

  Homopolymers or copolymers of esters {(C08L43/04 takes precedence)} · CPC title