Methyl-ethyl-hydroxyalkyl-cellulose and its use in building compositions

Patent metadata

Field	Value
Publication number	US-11834522-B2
Application number	US-201816640023-A
Country	US
Kind code	B2
Filing date	Aug 14, 2018
Priority date	Aug 17, 2017
Publication date	Dec 5, 2023
Grant date	Dec 5, 2023

Abstract

A methyl ethyl hydroxyalkyl cellulose (MEHEC), process for making the MEHEC, and a powder containing the MEHEC are disclosed. The MEHEC is provided with a DSmethyl from 1.5 to 2.5, a DSethyl from 0.005 to 0.15, and a MSalkylene-oxide from 0.005 to 0.2. The methyl ethyl hydroxyalkyl cellulose optionally includes an anti-oxidant. The MEHEC optionally does not have a combination of a DSmethyl of 2.2 or 1.8, a DSethyl of 0.05 or 0.1, and a MSalkylene-oxide of 0.1 and does not have a combination of a DSmethyl of 2.5 or 2.0, a DSethyl of 0.1, and a MSalkylene-oxide of 0.05. The MEHEC has very good biostability and is suitable for use in the building industry.

First claim

The invention claimed is:

1. A process to produce a powder mixture comprising from about 5 to about 90 percent by weight of a methyl ethyl hydroxyalkyl cellulose with a DSmethyl from 1.5 to 2.5, a DSethyl from 0.005 to 0.15, and a MS alkylene-oxide from 0.005 to 0.2 wherein the process comprises the step of dry mixing the methyl ethyl hydroxyalkyl cellulose and a powder comprising a polyvinyl alcohol.

2. The process of claim 1 wherein the methyl ethyl hydroxyalkyl cellulose has a DSmethyl of 1.6 to 2.5.

3. The process of claim 1 wherein the methyl ethyl hydroxyalkyl cellulose has a particle size such that the D10 is from about 27 to about 75 μm and the D98 is from about 200 to about 600 μm.

4. The process of claim 1 wherein the methyl ethyl hydroxyalkyl cellulose has a DSmethyl, DSethyl, and MSalkylene-oxide that results in a dissolution speed at pH=7 and a temperature of 20° C. such that the t1 is from about 0.1 to about 0.5 minutes and the t2 is from about 1 to about 10 minutes.

5. The process of claim 1 wherein the powder mixture is a redispersable powder suitable for use in mortars, comprising one or more additives for making mortars.

6. The process of claim 1 wherein the powder mixture comprises one or more water-soluble polymer other than methyl ethyl hydroxyalkyl cellulose.

7. A dry mortar mixture comprising 6 to 60 wt% of binder, based on the total amount of solid components of the dry mortar, and
from 0.1 to 0.5 percent by weight of a methyl ethyl hydroxyalkyl cellulose with a DSmethyl from 1.5 to 2.5, a DSethyl from 0.005 to 0.15, and a MSalkylene-oxide from 0.005 to 0.2, optionally comprising an anti-oxidant, whereby the methyl ethyl hydroxyalkyl cellulose optionally does not have a combination of a DSmethyl of 2.2 or 1.8, a DSethyl of 0.05 or 0.1, and a MSalkylene-oxide of 0.1 and does not have a combination of a DSmethyl of 2.5 or 2.0, a DSethyl of 0.1, and a MS alkylene-oxide of 0.05.

8. The mixture of claim 7 wherein the methyl ethyl hydroxyalkyl cellulose has a DSmethyl of 1.6 to 2.5.

9. The mixture of claim 7 wherein the methyl ethyl hydroxyalkyl cellulose has a particle size such that the D10 is from about 27 to about 75 μm and the D98 is from about 200 to about 600 μm.

10. The mixture of claim 7 wherein the methyl ethyl hydroxyalkyl cellulose has a DSmethyl, DSethyl, and MSalkylene-oxide that results in a dissolution speed at pH=7 and a temperature of 20° C. such that the t1 is from about 0.1 to about 0.5 minutes and the t2 is from about 1 to about 10 minutes.

11. The mixture of claim 7 that is a redispersable powder suitable for use in mortars, comprising one or more additives for making mortars.

12. The mixture of claim 7 that comprises one or more water-soluble polymer other than methyl ethyl hydroxyalkyl cellulose.

13. A process to make a mortar from the dry mortar mixture of claim 7 by mixing the dry mortar mixture with water.

Assignees

• Nouryon Chemicals Int Bv

Inventors

• Anger Leif Magnus Joakim
• Stridh Kjell
• Berglund Lars Erik
• Zapf Alexander

Classifications

• C08B11/193 Primary

  Mixed ethers, i.e. ethers with two or more different etherifying groups · CPC title

• C04B24/383 Primary

  Cellulose or derivatives thereof · CPC title

• C04B28/04

  Portland cements · CPC title

• C04B40/0042

  Powdery mixtures · CPC title

• C08L1/284

  with hydroxylated hydrocarbon radicals · CPC title