# US 10,370,547 B2 · Opacifying additive

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- Number: US 10,370,547 B2
- Document ID: US10370547B2
- Status: Granted
- Kind: B2
- Application number: 15/129,552
- Filed: 2015-03-30
- Published: 2017-06-22
- Granted: 2019-08-06
- Earliest claimed: 2014-03-31
- Assignees: Wacker Chemical Corporation
- Applicants: Wacker Chemical Corporation
- Inventors: Richard Henry Bott
- Web page: https://patentgrep.com/patent/US10370547B2

## CPC

- B01J 13/0021: {containing a solid organic phase}
- B01J 13/0047: {containing a metal oxide}
- C08J 3/122: {Pulverisation by spraying}
- C09D 5/024: {characterised by the additives}
- C09D 7/61: inorganic
- C09D 7/65: macromolecular (C09D7/41-C09D7/48 take precedence)
- C09D 7/69: {Particle size larger than 1000 nm}
- C09D 7/70: {characterised by shape, e.g. fibres, flakes or microspheres}
- D21H 19/385: {Oxides, hydroxides or carbonates}
- D21H 19/42: at least partly organic
- D21H 19/60: Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
- D21H 21/54: being spherical, e.g. microcapsules, beads
- C08J 2331/04: Homopolymers or copolymers of vinyl acetate
- C08K 2003/2241: {Titanium dioxide}
- C08L 23/08: Copolymers of ethene (C08L23/16 takes precedence)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- 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)
- 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)
- 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
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A powdery opacifying additive, comprising a polymer of one or more monomers from the group comprising vinyl esters, (meth)acrylic esters, vinylaromatics, olefins, 1,3 dienes and vinyl halides and, if appropriate, further monomers which are copolymerizable therewith, in the form of agglomerated polymer particles with included air-voids, having a volume mean particle size dv of 20 to 80 μm.

## Claims

### Claim 1

A coating composition, comprising a polymer dispersion, a pigment, and a filler and comprising a powdery opacifying additive in an amount of 1 to 30% by weight, based on the dry weight of the polymer applied with the polymer dispersion, wherein the powdery opacifying additive comprises
a polymer of one or more monomers selected from the group consisting of vinyl esters, (meth)acrylic esters, vinylaromatics, olefins, 1,3 dienes and vinyl halides and, if appropriate, further monomers which are copolymerizable therewith, in the form of agglomerated polymer particles with included air-voids, having a volume mean particle size dv of 20 to 80 μm.

### Claim 2 (depends on 1)

The coating composition of claim 1, wherein the powdery opacifying additive comprises a vinyl acetate ethylene copolymer with 70-98% by weight vinyl acetate and 2 to 30% by weight ethylene.

### Claim 3 (depends on 1)

The coating composition of claim 1, wherein the powdery opacifying additive is prepared with a process comprising the steps of spray-drying, without the addition of a drying-aid, an aqueous dispersion of a polymer of one or more monomers from the group comprising vinyl esters, (meth)acrylic esters, vinylaromatics, olefins, 1,3 dienes and vinyl halides and optionally further monomers which are copolymerizable therewith, to form agglomerated polymer particles with included air-voids, having a volume mean particle size dv of 20 to 80 μm.

### Claim 4 (depends on 3)

The coating composition of claim 3, prepared with a process comprising spray-drying of an aqueous dispersion of a vinyl acetate ethylene copolymer with 70-98% by weight vinyl acetate and 2 to 30% by weight ethylene.

### Claim 5 (depends on 1)

The coating composition of claim 1, wherein the pigment comprises at least partly titanium dioxide.

### Claim 6 (depends on 1)

A paint comprising the coating composition of claim 1.

### Claim 7 (depends on 1)

A paper coating comprising the coating composition of claim 1.

### Claim 8 (depends on 2)

The coating composition of claim 2, wherein the pigment comprises at least partly titanium dioxide.

### Claim 9 (depends on 8)

A paint comprising the coating composition of claim 8.

### Claim 10 (depends on 8)

A paper coating comprising the coating composition of claim 8.