# US 5,703,156 A · Dispersible powder binders

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- Number: US 5,703,156 A
- Document ID: US5703156A
- Status: Granted
- Kind: A
- Application number: 08/674,634
- Filed: 1996-07-05
- Granted: 1997-12-30
- Earliest claimed: 1994-03-09
- Assignees: Polymer Latex GmbH & Co. KG
- Inventors: Thomas Sauer
- Web page: https://patentgrep.com/patent/US5703156A

## CPC

- C08J 3/122: {Pulverisation by spraying}
- C04B 24/2641: {Polyacrylates; Polymethacrylates}
- C04B 26/06: Acrylates
- C04B 40/0042: {Powdery mixtures}
- C04B 41/483: {Polyacrylates}
- C08L 33/06: of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
- C09D 133/06: of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C08J 2333/06: of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- 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
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)

## Abstract

Dispersible powdered binders prepared from aqueous acrylate dispersions stabilized by protective colloids and water soluble or water dispersible resins. The binders are suitable for the production of powdered dry paint and coating composition mixtures which can be converted into useful form simply by stirring into water.

## Claims

### Claim 1

A redispersible powdered binder, comprising:
(I) an aqueous acrylate dispersion stabilized with a protective colloid having a solids content of 10 to 65 wt. %; and
(II) 0.01 to 30 wt. %, based on 100 wt. % of component (I) of a water-soluble or water-dispersible resin having a mean molecular weight ranging from 2000 to 100,000 g/mol, consisting of
(a) 50 to 70 wt. % of at least one hydrophobic monomer, essentially insoluble in water by having a solubility in water of less than 3 wt. % at 25.degree. C., and
(b) 50 to 30 wt. % of at least one hydrophilic monomer, which is soluble in water and which forms salts, where the solubility of these monomers in metal or ammonium salt form in water is at least 10 wt. % at 25.degree. C.;
prepared by spray-drying the combination of components (I) and (II) in a hot air stream to form the powdered binder with the formation of little dust.

### Claim 2 (depends on 1)

The redispersible powdered binder of claim 1, wherein said component (IIa) is a hydrophobic monomer selected from the group consisting of a C.sub.1-8 -alkyl(meth)acrylate, styrene, and mixtures thereof; and component (IIb) is a water-soluble, hydrophilic-unsaturated sulfonic acid compound or salt thereof, an unsaturated monobasic or multibasic carboxylic acid or salt thereof, or a combination of said unsaturated sulfonic acid compound and said unsaturated carboxylic acid compound.

### Claim 3 (depends on 1)

The redispersible powdered binder of claim 1, wherein the water-soluble or water-dispersible resin has a glass transition temperature less than 50.degree. C. below the point of entry of the combined ingredients to the spray-dryer in which the materials are spray-dried.

### Claim 4 (depends on 2)

The redispersible powdered binder of claim 2, wherein the water-soluble or water-dispersible resin has a glass transition temperature less than 50.degree. C. below the point of entry of the combined ingredients to the spray-dryer in which the materials are spray-dried.

### Claim 5 (depends on 1)

The redispersible powdered binder of claim 1, wherein the aqueous acrylate dispersion (I) has a minimum film formation temperature of -30.degree. C. to 40.degree. C.

### Claim 6 (depends on 2)

The redispersible powdered binder of claim 2, wherein the aqueous acrylate dispersion (I) has a minimum film formation temperature of -30.degree. C. to 40.degree. C.

### Claim 7 (depends on 1)

The redispersible powdered binder of claim 1, wherein the water-soluble polymer which forms said protective colloid is hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, water-soluble and water-swellable starches and dextrins, polyethylene glycols, polyethylene-polypropylene diblock and triblock copolymers and naturally occurring proteins.

### Claim 8 (depends on 1)

The redispersible powdered binder of claim 1, wherein the acrylate monomer component of said acrylate dispersion comprises from 20 to 100% of C.sub.1-18 -alkyl(meth)acrylate, and the remaining monomer of the acrylate dispersion is a member selected from the group consisting of aromatic vinyl monomers, vinyl esters having 1 to 12 carbon atoms in the acid component, olefinically unsaturated dienes and halogenated olefinically unsaturated monomers.

### Claim 9

A method for the preparation of a redispersible powdered binder, comprising:
spray-drying a mixture of an aqueous acrylate dispersion and from 0.01 to 30 wt. %, based on 100 wt. % of said aqueous acrylate dispersion, of a water-soluble or water-dispersible resin in a spray-dryer having an entry temperature of 80.degree. to 150.degree. C. and an exit temperature of 40.degree. to 100.degree. C., thereby forming said powdered, free-flowing binder having little dust, said aqueous acrylate dispersion (I) being stabilized with a protective colloid having a solids content of 10 to 65 wt. %; and said water-soluble or water-dispersible resin (II) having a mean molecular weight ranging from 2000 to 100,000 g/mol, consisting of
(a) 50 to 70 wt. % of at least one hydrophobic monomer essentially insoluble in water having a solubility in water of less than 3 wt. % at 25.degree. C., and
(b) 50 to 30 wt. % of at least one hydrophilic monomer, which is soluble in water and which forms salts, the metal or ammonium salt form of the monomer having a solubility of at least 10 wt. % at 25.degree. C. in water.

### Claim 10 (depends on 1)

A paint or coating composition comprising the redispersible powdered binder of claim 1 and no hydraulic binder.

### Claim 11 (depends on 2)

A paint or coating composition comprising the redispersible powdered binder of claim 2 and no hydraulic binder.

### Claim 12 (depends on 1)

A hydraulically setting composition comprising the redispersible powdered binder of claim 1 and no hydraulic binder.

### Claim 13 (depends on 2)

A hydraulically setting composition comprising the redispersible powdered binder of claim 2 and no hydraulic binder.