# US 11,028,017 B2 · Fast-drying screed and screed mixture for producing the screed

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- Number: US 11,028,017 B2
- Document ID: US11028017B2
- Status: Granted
- Kind: B2
- Application number: 15/746,901
- Filed: 2015-07-23
- Published: 2020-03-19
- Granted: 2021-06-08
- Earliest claimed: 2015-07-23
- Assignees: Knauf Gips KG
- Applicants: Knauf Gips KG
- Inventors: Sabrina Friedrich; Matthias Büttner
- Web page: https://patentgrep.com/patent/US11028017B2

## CPC

- C04B 28/14: containing calcium sulfate cements {(gypsum-paper plates E04C)}
- C04B 14/06: Quartz; Sand
- C04B 24/04: Carboxylic acids; Salts, anhydrides or esters thereof
- C04B 24/16: Sulfur-containing compounds
- C04B 24/42: Organo-silicon compounds
- C04B 2111/00482: {Coating or impregnation materials}
- C04B 2111/62: Self-levelling compositions
- 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

## Abstract

The invention relates to screed mixtures, comprising an inorganic binder, processing additives and drying additives. Self-levelling floor screeds according to the invention can be produced from these screed mixtures, said self-levelling floor screeds drying much more quickly than self-levelling floor screeds with the same composition, but which contain no drying additives.

## Claims

### Claim 1

A screed mixture, comprising an inorganic binder, processing additives for improving processability of the screed, and drying additives, wherein the drying additives are selected from hydrophobing agents, or wherein the drying additives are selected from a mixture of hydrophobing agents and pore forming agents, or a mixture of hydrophobing agents and porous additives, or a mixture of hydrophobing agents, pore forming agents and porous additives, wherein the hydrophobing agent is contained in a quantity of 0.03 to 0.15 wt. % related to the total mass of the screed mixture, or wherein the drying additives are selected from a mixture of pore forming agents and porous additives, wherein the pore forming agent and the porous additive are each contained in a quantity of 0.001 to 10 wt. % related to the total mass of the screed mixture.

### Claim 2 (depends on 1)

The screed mixture according to claim 1, wherein the inorganic binder is a calcium sulphate-containing binder or a cement-containing binder.

### Claim 3 (depends on 1)

The screed mixture according to claim 1, wherein the screed mixture also contains fillers.

### Claim 4 (depends on 1)

The screed mixture according to claim 1, wherein the hydrophobing agent is contained in a quantity of 0.03 to 0.08 wt. % related to the total mass of the screed mixture.

### Claim 5 (depends on 1)

The screed mixture according to claim 1, wherein said processing additives are selected from the group consisting of liquefiers, alkaline initiators, retarders, crystalline initiators, stabilisers and defoamers.

### Claim 6

A self-levelling floor screed, comprising an inorganic binder, fillers, processing additives for improving processability of the screed, and drying additives, wherein the drying additives are selected from hydrophobing agents, or wherein the drying additives are selected from a mixture of hydrophobing agents and pore forming agents, or a mixture of hydrophobing agents and porous additives, or a mixture of hydrophobing agents, pore forming agents and porous additives, wherein the hydrophobing agent is contained in a quantity of 0.03 to 0.15 wt. % related to the total mass of the screed mixture, and/or the drying additives are selected from a mixture of pore forming agents and porous additives, wherein the pore forming agent and the porous additive are each contained in a quantity of 0.001 to 10 wt. % related to the total mass of the screed mixture.

### Claim 7 (depends on 6)

The self-levelling floor screed according to claim 6, wherein the binder is a calcium sulphate-containing or a cement-containing binder.

### Claim 8 (depends on 6)

The self-levelling floor screed according to claim 6, wherein said processing additives are selected from the group consisting of liquefiers, alkaline initiators, retarders, crystalline initiators, stabilisers and defoamers.

### Claim 9

A method including the use of a hydrophobing agent as a drying additive, the method including a step of adding the hydrophobing agent to a chemically setting binder composition in a quantity of 0.03 to 0.15 wt. % related to the total mass of the composition.

### Claim 10 (depends on 9)

The method according to claim 9, wherein the chemically setting binder composition is a screed mixture, a screed compound, a screed premixed dry mortar or a self-levelling floor screed.