US 2013/0330532 A1 · DISPERSANT CONTAINING GYPSUM SLURRY

Abstract

The subject of the present invention is a gypsum containing aqueous slurry containing a phosphate based polycondensate as sole agent with dispersing properties. With a phosphated polycondensate according to the invention as sole dispersing component an improved efficiency was found in comparison with the polycondensates known in the prior art. As additional favorable effect a significantly decreased retardation of the setting and hardening of the various construction compositions and especially of gypsum based slurries compared to other dispersants is to be observed, independently from the dosage of the dispersing component. This effect of the polycondensate component as well as an expedient influence on the pore structure surprisingly can be observed.

Claims66

Dependent claims

A gypsum slurry having comprising gypsum and a dispersant, wherein the dispersant is a polycondensation product comprising:

(I) a structural unit with an aromatic or heteroaromatic sub-unit and a polyether side chain;
(II) a phosphated structural unit with an aromatic or heteroaromatic sub-unit;
and optionally
(III) at least one structural unit with an aromatic or heteroaromatic sub-unit
wherein structural unit (II) and structural unit (III) differing exclusively in that the OP(OH)2 group of the structural unit (II) is replaced by H in structural unit (III), and structural unit (III) is not the same as structural unit (I).

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/821,503Filed 7 Oct 2011

Priority

11 Oct 2010

Published

12 Dec 2013

Term ends

Not estimatedThe source records don’t support an estimate.

Classification17 codes

C04B 16/04
Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted…
C04B 24/2617
Obtained by reactions only involving carbon-to-carbon unsaturated bonds: coumarone polymers
C04B 28/14
Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic…
C08G 65/3353
Containing phosphorus: containing oxygen in addition to phosphorus

Dispersant containing gypsum slurry

Life of this patent

Dispersant containing gypsum slurry

Life of this patent

Abstract

Claims66