Polymeric dispersant

Patent metadata

Field	Value
Publication number	US-2016122243-A1
Application number	US-201414897778-A
Country	US
Kind code	A1
Filing date	Jul 10, 2014
Priority date	Jul 12, 2013
Publication date	May 5, 2016
Grant date	—

Abstract

The invention relates to a dispersant comprising a polymer obtainable by copolymerization of monomers including 5 to 80 mol % of a hydroxyalkyl acrylate phosphate and/or hydroxyalkylacrylamide phosphate (monomer 1), 0 to 20 mol % of a di(hydroxyalkyl acrylate) phosphate and/or di(hydroxyalkylacrylamide) phosphate (monomer 2) and 1 to 80 mol % of a polyalkylene glycol-containing macromonomer comprising an alkene group (monomer 3). Further disclosed is a process for preparing the polymers of the invention and the use thereof as dispersants in calcium sulphate-containing compositions. A further aspect of the invention is a process for producing shaped gypsum bodies, and also shaped gypsum bodies, more particularly gypsum plasterboards and self-levelling screeds, comprising the dispersant of the invention.

First claim

1 .- 13 . (canceled)

14 . A dispersant comprising a polymer obtained by copolymerizing monomers comprising:
5 to 80 mol % of at least one monomer 1 of formula (1),

0 to 20 mol % of at least one monomer 2 of formula (2);

and
1 to 80 mol % of at least one monomer 3 of formula (3):
R 3 —O—(C n H 2n O) m —Z  (3)

wherein
R 1 is an alkylene group having 2 to 8 carbon atoms;
Y is O or NR 2 ;
R 2 is a radical from the group of hydrogen, an alkyl group having 1 to 8 carbon atoms, and formula (A),

M 1 and M 2 each independently of one another are hydrogen, an ammonium compound and a mono-, di- or trivalent metal;
R 3 is hydrogen, an aliphatic hydrocarbon radical having 1 to 16 C atoms, a cycloaliphatic radical having 5 to 12 C atoms or an aryl radical having 6 14 C atoms, it being possible for the aryl radical to have further substituents;
N is identical or different and in each case is an integer from 2 to 4;
M is an integer between 20 and 160;
Z is at least one radical selected from the group consisting of formulae (4), (5), (6) and (7) below:

15 . A dispersant according to claim 14 , wherein the polymer consists of monomer 1.

16 . A dispersant according to claim 14 , wherein the group R 1 both in monomer 1 and in monomer 2 is an ethylene group.

17 . A dispersant according to claim 14 , wherein the group R 1 in monomer 1 is an ethylene group.

18 . A dispersant according to claim 14 , wherein the polymer consists of monomer 1 and monomer 2.

19 . A dispersant according to claim 18 , wherein the group R 1 both in monomer 1 and monomer 2 is an ethylene group.

20 . A dispersant according to claim 14 , wherein the polymer has an average molecular weight of between 15,000 and 60,000 g/mol, the molecular weight being measured by gel permeation chromatography against a PEG standard.

21 . A process for preparing a polymer according to claim 14 , comprising:
copolymerizing in an aqueous solution at least one monomer 1 of the formula (1), optionally at least one monomer 2 of the formula (2), and at least one monomer 3 of the formula (3).

22 . A process according to claim 21 , wherein the temperature of the reaction solution is set between 5 and 100° C. and the pH between 0.5 and 8.

23 . A calcium sulphate based binder system comprising a calcium sulphate binder and the dispersant according to claim 14 .

24 . A process comprising producing a shaped gypsum body with a dispersant according to claim 14 .

25 . A shaped gypsum body comprising gypsum and the dispersant according to claim 14 .

26 . A process according to claim 24 , wherein the shaped gypsum body is a gypsum plasterboard.

27 . A shaped gypsum body according to claim 25 , wherein the shaped gypsum body is a gypsum plasterboard.

28 . A process according to claim 24 , wherein the shaped gypsum body is a calcium sulphate-containing self-levelling screed.

29 . A shaped gypsum body comprising calcium sulphate and the dispersant according to claim 14 , wherein the shaped gypsum body is a calcium sulphate-containing self-levelling screed.

Assignees

• Basf Se

Inventors

• Gaedt Torben
• Winklbauer Martin
• Grassl Harald
• Schinabeck Michael
• Hillesheim Nina Susanne
• Grafetstetter Antonia

Classifications

• C04B24/246

  containing polyether side chains · CPC title

• C04B28/14

  containing calcium sulfate cements {(gypsum-paper plates E04C)} · CPC title

• C04B2111/62

  Self-levelling compositions · CPC title

• C04B2103/408

  Dispersants · CPC title

• C04B16/04

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