Method for reducing agglomeration in gypsum plaster or filling compositions comprising cellulose ether

Patent metadata

Field	Value
Publication number	US-10457600-B2
Application number	US-201214362954-A
Country	US
Kind code	B2
Filing date	Dec 4, 2012
Priority date	Dec 9, 2011
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

The present invention relates to a method for providing modified gypsum plaster or filling compositions having reduced agglomeration in comparison to gypsum plaster or filling compositions comprising cellulose ether in a specific amount from 0.1 to 1.0 weight percent, based on the total dry weight of said composition. Also provided are dry mortars comprising cellulose ether, gelatin and gypsum for use in such methods, and gypsum-free mixtures comprising cellulose ether and gelatin which may be added to gypsum binder for use a for use in such methods.

First claim

The invention claimed is:

1. A method for providing a modified gypsum plaster or filling composition having reduced agglomeration in comparison to a gypsum plaster or filling composition comprising a water soluble cellulose ether in a specified amount X, where the specified amount is from 0.1 to 1.0 weight percent based on the total dry weight of said composition components, said method comprising:
a) forming a dry mortar comprising gypsum binder; water soluble cellulose ether in an amount of X minus Y; and gelatin in an amount Y, wherein Y is from 0.02X to 0.30X; and
b) combining said dry mortar with water to form a modified gypsum plaster or filling composition;
wherein said cellulose ether is an alkylhydroxyalkylcellulose, a hydroxyalkyl cellulose, or a mixture thereof;
wherein said cellulose ether has a median particle diameter DOP (50,3) of from 25 μm to 45 μm.

2. A method for providing a modified gypsum plaster or filling composition having reduced agglomeration in comparison to a gypsum plaster or filling composition comprising a water soluble cellulose ether in a specified amount X, where the specified amount is from 0.1 to 1.0 weight percent based on the total dry weight of said composition components, said method comprising:
a) forming a dry mortar comprising gypsum binder; water soluble cellulose ether in an amount of X minus Y; and gelatin in an amount Y, wherein Y is from 0.02X to 0.30X; and
b) combining said dry mortar with water to form a modified gypsum plaster or filling composition;
wherein said cellulose ether is an alkylhydroxyalkylcellulose, a hydroxyalkyl cellulose, or a mixture thereof;
wherein said cellulose ether has a median particle diameter of the equivalent particle circle EQPC (50,3) of from 65 μm to 100 μm.

Assignees

• Dow Global Technologies Llc

Inventors

• Neubauer Joerg
• Scharlemann Sonja

Classifications

• C04B16/02

  Cellulosic materials (cellulosic waste materials, e.g. sawdust, rice husks, C04B18/24) · CPC title

• C04B16/04

  Macromolecular compounds (C04B16/02 takes precedence) · CPC title

• C04B2111/00198

  Characterisation or quantities of the compositions or their ingredients expressed as mathematical formulae or equations · CPC title

• C04B11/00 Primary

  Calcium sulfate cements · CPC title

• C04B40/0039

  Premixtures of ingredients · CPC title