Gypsum-containing composition

Patent metadata

Field	Value
Publication number	US-2018118624-A1
Application number	US-201615561096-A
Country	US
Kind code	A1
Filing date	Apr 18, 2016
Priority date	Apr 30, 2015
Publication date	May 3, 2018
Grant date	—

Abstract

The invention relates to a composition comprising at least one binder based on calcium sulfate and at least one polymer obtainable by polymerization of monomers based on alkoxylates of S-vinylthioalkanols. Furthermore a molding, in particular a gypsum plasterboard, a gypsum wallboard, a screed or a knifing filler, obtained by setting of the composition of the invention is disclosed.

First claim

1 . A composition comprising
A) at least one binder based on calcium sulfate and B) at least one polymer obtainable by polymerization of monomers comprising an unsaturated compound of the general formula (I)

where
R 1 , R 2 , R 3 are identical or different and are each, independently of one another, H, or CH 3 ,
R 4 is linear or branched C 1 -C 30 -alkylene,
R 5 , R 6 are identical or different and are each, independently of one another, H, C 1 -C 20 -alkyl, C 3 -C 15 -cycloalkyl, aryl, —CH 2 —O—C 1 -C 20 -alkyl, or CH 2 —O—C 2 -C 20 -alkenyl, where R 5 and R 6 can together also form a C 3 -C 6 -alkylene,
R 7 is H, C 1 -C 4 -alkyl, or

R 8 is C 1 -C 22 -alkyl, or C 2 -C 22 -alkenyl, and
n is an integer from 2 to 200.

2 . The composition according to claim 1 , wherein R 4 is a C 2 -C 4 -alkylene group, R 5 , R 6 are identical or different and are each, independently of one another, a group selected from among H, —CH 3 , —CH 2 -CH 3 , —C 3 -C 11 -alkyl, C 12 -C 22 -alkyl, phenyl, —CH 2 —O—C 1 -C 10 -alkyl, and CH 2 —O—C 2 -C 10 -alkenyl, R 7 is N or C 1 -C 4 alkyl and a is from 5 to 140.

3 . The composition according to claim 1 , wherein the unsaturated compounds are unsaturated compounds (Ia)

where
R 3 is H methyl,
R 4 is a linear or branched C 2 -C 10 -alkylene group,
R 5 , R 6 are each, independently of one another, H, methyl or ethyl, with the proviso that the sum of the carbon atoms in the radicals R 5 and R 6 is in each case from 0 to 2 per alkoxy group, and
n is from 5 to 160.

4 . The composition according to claim 1 , wherein the unsaturated compounds are unsaturated compounds (Ib)

Where n is from 20 to 140.

5 . The composition according to claim 4 , wherein n is from 60 to 140.

6 . The composition according to claim 1 , wherein the polymer comprises at least one further monomer which is different from the unsaturated compound of the general formula (I) in the polymer.

7 . The composition according to claim 6 , wherein the at least one further monomer is at least one monoethylenically unsaturated monomer comprising at least one acid group, where the acid group can optionally be entirely or partly neutralized.

8 . The composition according to claim 7 , wherein the acid group is at least one group selected from the group consisting of carboxylic acid, sulfonic acid, phosphoric acid and phosphonic acid groups.

9 . The composition according to claim 8 , wherein the polymer comprises at least one monomer having phosphoric or phosphoric acid groups selected from the group consisting of vinylphosphonic acid, esters of hydroxyethyl, hydroxypropyl or hydroxybutyl (meth)acrylate with (poly)phosphoric acid, monovinyl phosphate, allylphosphonic acid, monoallyl phosphate, 3-butenylphosphonic acid, mono-3-butenyl phosphate, mono(4-vinyloxybutyl) phosphate, mono(2-hydroxy-3-vinyloxypropyl) phosphate, mono(1-phosphonoxymethyl-2-vinyloxyethyl) phosphate, mono(3-allyloxy-2-hydroxypropyl) phosphate, mono-2-(allylox-1-phosphonoxymethylethyl) phosphate, 2-hydroxy-4-vinyloxymethyl-1,3,2-dioxaphosphole, 2-hydroxy-4-allyloxymethyl-1,3,2-dioxaphosphole and salts thereof.

10 . The composition according to claim 1 , wherein from 5 to 99.9% by weight of unsaturated compounds of the general formula (I), based on the total amount of monomers, are comprised in the polymer.

11 . The composition according to claim 7 , wherein from 5 to 99.9% by weight of unsaturated compounds of the general formula (I) and from 95 to 0.1% by weight of further monoethylenically unsaturated monomers, in each case based on the total amount of monomers, are comprised in the polymer.

12 . The composition according to claim 7 , wherein the binder based on calcium sulfate is α-hemihydrate, α/β-hemihydrate, β-hemihydrate, natural anhydrite, synthetic anhydrite, anhydrite obtained from flue gas desulfurization and/or mixtures of two or more thereof.

13 . The composition according to claim 7 , wherein the composition comprises, based on the dry mass, at least 10% by weight of A) the at least one binder based on calcium sulfate and from 0.005 to 5% by weight of B) the at least one polymer.

14 . A molding produced by setting of a composition according claim 7 .

15 . The molding according to claim 14 , wherein the molding is a gypsum plasterboard, gypsum wallboard, screed or a knifing filler.

16 . A molding produced by setting of a composition according to claim 1 .

17 . The molding according to claim 16 , wherein the molding is a gypsum plasterboard, gypsum wallboard, screed or a knifing filler.

18 . The composition according to claim 1 , wherein from 5 to 99.9% by weight of unsaturated compounds of the general formula (I) and from 95 to 0.1% by weight of further monoethylenically unsaturated monomers, in each case based on the total amount of monomers, are comprised in the polymer.

19 . The composition according to claim 1 , wherein the binder based on calcium sulfate is α-hemihydrate, α/β-hemihydrate, β-hemihydrate, natural anhydrite, synthetic anhydrite, anhydrite obtained from fine gas desulfurization and/or mixtures of two or more thereof.

20 . The composition according to claim 1 , wherein the composition comprises, based on the dry mass, at least 10% by weight of A) the at least one binder based on calcium sulfate and from 0.005 to 5% by weight of B) the at least one polymer.

Assignees

• Basf Se

Inventors

• Hillesheim Nina Susanne
• Gehrig Uwe

Classifications

• C04B2111/0062

  Gypsum-paper board like materials · CPC title

• C04B28/146 Primary

  alpha-hemihydrate · CPC title

• C04B28/147

  beta-hemihydrate · CPC title

• C08F28/04

  Thioethers · CPC title

• C04B24/165

  containing polyether side chains · CPC title