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

• US 10,457,600 B2
• Filed: 12/04/2012
• Issued: 10/29/2019
• Est. Priority Date: 12/09/2011
• Status: Active Grant

• Current Assignee: Dow Global Technologies LLC (Dow, Inc.)
• Original Assignee: Dow Global Technologies LLC (Dow, Inc.)
• Inventors: Neubauer, Joerg, Scharlemann, Sonja
• Primary Examiner(s): Ali, Shuangyi Abu
• Application Number:
  US14/362,954
• Publication Number:
  US 20150122152A1
• Time in Patent Office: 2,520 Days
• CPC Class Codes: C04B 11/00 Calcium sulfate cements
• CPC Class Codes: C04B 16/02 Cellulosic materials cellulosic waste materials, e.g. sawdust, rice husks, C04B18/24
• CPC Class Codes: C04B 16/04 Macromolecular compounds C04B16/02 takes precedence
• CPC Class Codes: C04B 2111/00198 Characterisation or quantities of the compositions or their ingredients expressed as mathematical formulae or equations
• CPC Class Codes: C04B 24/14 Peptides; Proteins; Derivatives thereof
• CPC Class Codes: C04B 24/383 Cellulose or derivatives thereof
• CPC Class Codes: C04B 28/14 containing calcium sulfate cements gypsum-paper plates E04C
• CPC Class Codes: C04B 40/0039 Premixtures of ingredients
• CPC Class Codes: C04B 40/0608 Dry ready-made mixtures, e.g. mortars at which only water or a water solution has to be added before use

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.

Claims

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 μ

m to 45 μ

m.

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 μ

m to 100 μ

m.