# US 8,465,584 B2 · Aqueous suspensions of fine-particulate fillers, method for the manufacture thereof and use thereof for the manufacture of papers containing fillers

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

- Number: US 8,465,584 B2
- Document ID: US8465584B2
- Status: Granted
- Kind: B2
- Application number: 13/130,841
- Filed: 2009-11-30
- Published: 2011-09-22
- Granted: 2013-06-18
- Earliest claimed: 2008-12-03
- Assignees: BASF SE
- Applicants: Joerg Nieberle; Anton Esser
- Inventors: Joerg Nieberle; Anton Esser
- Web page: https://patentgrep.com/patent/US8465584B2

## CPC

- C09C 1/021: {Calcium carbonates}
- C09C 1/025: {Calcium sulfates}
- C09C 1/027: {Barium sulfates}
- C09C 1/028: {Compounds containing only magnesium as metal}
- C09C 1/3607: {Titanium dioxide}
- C09C 1/402: {Satin white, modifications thereof, e.g. carbonated or silicated; Calcium sulfoaluminates; Mixtures thereof, e.g. with calcium carbonate or kaolin}
- C09C 1/42: Clays
- C09C 3/10: Treatment with macromolecular organic compounds {(C09C3/006 takes precedence)}
- D21H 17/69: modified, e.g. by association with other compositions prior to incorporation in the pulp or paper
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C09C: TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES (treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone C04B14/00, C04B18/00, C04B20/00); PREPARATION OF CARBON BLACK {; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS}
- D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

An aqueous slurry of finely divided fillers which are at least partly coated with anionic latices, wherein the slurry is obtainable by treating an aqueous slurry of finely divided fillers with an aqueous dispersion comprising at least one anionic latex and at least one degraded starch, preparation of the aqueous slurries and their use as an additive to the paper stock in the production of filler-containing paper, filler-containing cardboard or filler-containing board by draining the paper stock.

## Claims

### Claim 1

An aqueous slurry of finely divided fillers which are at least partly coated with anionic latices, wherein the slurry is obtained by a process comprising treating an aqueous slurry of finely divided fillers with an aqueous dispersion comprising at least one anionic latex and at least one degraded starch,
wherein said at least one anionic latex comprises at least one monomer comprising phosphoric acid groups incorporated in the form of polymerized units.

### Claim 2 (depends on 1)

The aqueous slurry according to claim 1, wherein the glass transition temperature of the anionic latex is in the range of −50 to +10° C.

### Claim 3 (depends on 1)

The aqueous slurry according to claim 1, wherein the monomer which comprises phosphoric acid groups is obtained by a process comprising esterifying a monoethylenically unsaturated C3-C8-carboxylic acid with optionally a monoalkoxylated phosphoric acid of the general Formula (I)
H—[X]n—P(O)(OH)2 (I)
in which
X is a straight-chain or branched C2-C6-alkylene oxide unit and
n is an integer from 0 to 20.

### Claim 4 (depends on 3)

The aqueous slurry according to claim 3, wherein monoalkoxylated phosphoric acid of the Formula (I), in which X is a straight-chain or branched C2-C3-alkylene oxide unit and n is an integer from 5 to 15, is present in the esterification.

### Claim 5 (depends on 3)

The aqueous slurry according to claim 3, wherein mixtures of monoalkoxylated phosphoric acid of the Formula (I) having from 5 to 15 units of propylene oxide are present in the esterification.

### Claim 6 (depends on 3)

The aqueous slurry according to claim 3, wherein the monoethylenically unsaturated C3-C8-carboxylic acid is acrylic acid, methacrylic acid, dimethylacrylic acid, ethacrylic acid, maleic acid, citraconic acid, methylenemalonic acid, crotonic acid, fumaric acid, mesaconic acid and/or itaconic acid.

### Claim 7 (depends on 6)

The aqueous slurry according to claim 6, wherein the monoethylenically unsaturated C3-C8-carboxylic acid is acrylic acid or methacrylic acid.

### Claim 8 (depends on 3)

The aqueous slurry according to claim 3, wherein the anionic latices consist of
(1) styrene and/or acrylonitrile or methacrylonitrile,
(2) acrylates and/or methacrylates of C1- to C10-alcohols and optionally
(3) acrylic acid, methacrylic acid, maleic acid and/or itaconic acid and
(4) (meth)acrylates of optionally monoalkoxylated phosphoric acids of the Formula (I), in which X and n have the abovementioned meaning.

### Claim 9 (depends on 8)

The aqueous slurry according to claim 8, wherein the anionic latices consist of 2-25% by weight of styrene, 2-25% by weight of acrylonitrile, 50-95% by weight of C1-C4-alkyl acrylates, 0-5% by weight of acrylic acid and 0.1-5% by weight of (meth)acrylates of monoalkoxylated phosphoric acids of the Formula (I), in which X is a propylene oxide unit and n is an integer of from 5 to 15.

### Claim 10 (depends on 1)

The aqueous slurry according to claim 1, wherein the degraded starch has an average molecular weight Mw of from 1000 to 65 000.

### Claim 11 (depends on 10)

The aqueous slurry according to claim 10, wherein the degraded starch is a maltodextrin.

### Claim 12 (depends on 1)

The aqueous slurry according to claim 1, which comprises from 1 to 70% by weight of at least one finely divided filler and from 0.01 to 10% by weight of said at least one anionic latex and said at least one degraded starch, based on the filler.

### Claim 13 (depends on 1)

A process for the preparation of an aqueous slurry according to claim 1, comprising adding an aqueous dispersion comprising from 0.01 to 10% by weight of at least one anionic latex and at least one degraded starch, based on the filler, to an aqueous slurry of at least one finely divided filler, or mixing the aqueous slurry of a finely divided filler into an aqueous dispersion comprising at least one anionic latex and at least one degraded starch, or mixing the finely divided filler in solid form into an aqueous dispersion comprising at least one anionic latex and at least one degraded starch.

### Claim 14 (depends on 1)

An additive to the paper stock in the production of filler-containing paper, filler-containing cardboard or filler-containing board by draining the paper stock, comprising the aqueous slurry according to claim 1.

### Claim 15 (depends on 1)

The aqueous slurry according to claim 1, wherein a ratio of anionic latex to degraded starch is from 30:1 to 1:1.

### Claim 16 (depends on 1)

The aqueous slurry according to claim 1, wherein a ratio of anionic latex to degraded starch is from 10:1 to 1:1.

### Claim 17 (depends on 1)

The aqueous slurry according to claim 1, wherein a ratio of anionic latex to degraded starch is from 5:1 to 1:1.