Spray drying method

Patent metadata

Field	Value
Publication number	US-2020283584-A1
Application number	US-201816759339-A
Country	US
Kind code	A1
Filing date	Oct 24, 2018
Priority date	Oct 27, 2017
Publication date	Sep 10, 2020
Grant date	—

Abstract

The invention relates to a process for producing a pulverulent composition comprising at least one polymeric dispersant (PD) which comprises structural units having anionic and/or anionogenic groups and structural units having polyether side chains, and at least one polysaccharide (PS). The process here comprises the process steps: a) production of an aqueous dispersion having a viscosity of the dispersion of less than 10 000 mPa·s, comprising the at least one polymeric dispersant (PD) and the at least one polysaccharide (PS) and b) spray drying of the aqueous dispersion produced in process step a). Furthermore, the use of the pulverulent composition according to the invention in inorganic binder compositions, especially as a rheological additive, is disclosed.

First claim

1 .- 15 . (canceled)

16 . A process for producing a pulverulent composition comprising at least one polymeric dispersant (PD) which comprises at least one structural unit comprising anionic groups and/or at least one structural unit comprising anionogenic groups and also at least one structural unit having polyether side chains, and at least one polysaccharide (PS), wherein the weight ratio of polymeric dispersant (PD) to polysaccharide (PS) is from 1/1 to 50/1 and the following process steps are performed:
a) production of an aqueous dispersion having a viscosity of the dispersion of less than 10 000 mPa·s, comprising the at least one polymeric dispersant (PD) and the at least one polysaccharide (PS), b) spray drying of the aqueous dispersion produced in process step a).

17 . The process according to claim 16 , wherein the polymeric dispersant (PD) is a polymer that was obtained by means of polymerization of at least one monomer having at least one anionic and/or at least one anionogenic group and of at least one monomer comprising at least one polyether side chain.

18 . The process according to claim 17 , wherein the polymeric dispersant (PD) has at least one structural unit of general formulae (Ia), (Ib), (Ic) or (Id):

in which
R 1 is H or an unbranched or branched C 1 -C 4 -alkyl group, CH 2 COOH or CH 2 CO—X—R 3 ;
X is NH—(C n H 2n ) or O—(C n H 2n ) with n=1, 2, 3 or 4 or is a chemical bond, wherein the nitrogen atom or the oxygen atom is bonded to the CO group;
R 2 is OM, PO 3 M 2 or O—PO 3 M 2 ; with the proviso that X is a chemical bond when R 2 is OM;
R 3 is PO 3 M 2 or O—PO 3 M 2 ;

in which
R 3 is H or an unbranched or branched C 1 -C 4 -alkyl group;
n is 0, 1, 2, 3 or 4;
R 4 is PO 3 M 2 or O—PO 3 M 2 ;

in which
R 5 is H or an unbranched or branched C 1 -C 4 -alkyl group;
Z is O or NR 7 ; and
R 7 is H, (C n H 2n )—OH, (C n H 2n )—PO 3 M 2 , (C n H 2n )—OPO 3 M 2 , (C 6 H 4 )—PO 3 M 2 or (C 6 H 4 )OPO 3 M 2 ,
n is 1, 2, 3 or 4;

in which
R 6 is H or an unbranched or branched C 1 -C 4 -alkyl group;
Q is NR 7 or O;
R 7 is H, (C n H 2n )—OH, (C n H 2n )—PO 3 M 2 , (C n H 2n )—OPO 3 M 2 , (C 6 H 4 )—PO 3 M 2 or (C 6 H 4 )—OPO 3 M 2 ,
n is 1, 2, 3 or 4; and
where each M is independently H or one cation equivalent.

19 . The process according to claim 16 , wherein the polymeric dispersant (PD) has at least one structural unit of general formulae (IIa), (IIb), (IIc) or (IId):

in which
R 10 , R 11 and R 12 are each independently H or an unbranched or branched C 1 -C 4 -alkyl group;
Z is O or S;
E is an unbranched or branched C 1 -C 6 -alkylene group, a cyclohexylene group, CH 2 —C 6 H 10 , 1,2-phenylene, 1,3-phenylene or 1,4-phenylene;
G is O, NH or CO—NH; or
E and G together are a chemical bond;
A is C x H 2x with x=2, 3, 4 or 5 or CH 2 CH(C 6 H 5 );
n is 0, 1, 2, 3, 4 and/or 5;
a is an integer from 2 to 350;
R 13 is H, an unbranched or branched C 1 -C 4 -alkyl group, CO—NH 2 and/or COCH 3 ;

in which
R 16 , R 17 and R 18 are each independently H or an unbranched or branched C 1 -C 4 -alkyl group;
E is an unbranched or branched C 1 -C 6 -alkylene group, a cyclohexylene group, CH 2 —C 6 H 10 , 1,2-phenylene, 1,3-phenylene or 1,4-phenylene, or is a chemical bond;
A is C x H 2x with x=2, 3, 4 or 5 or CH 2 CH(C 6 H 5 );
L is C x H 2x with x=2, 3, 4 or 5 or CH 2 —CH(C 6 H 5 );
a is an integer from 2 to 350;
d is an integer from 1 to 350;
R 19 is H or an unbranched or branched C 1 -C 4 -alkyl group;
R 20 is H or an unbranched or branched C 1 -C 4 -alkyl group; and
n is 0, 1, 2, 3, 4 or 5;

in which
R 21 , R 22 and R 23 are each independently H or an unbranched or branched C 1 -C 4 -alkyl group;
W is O, NR 25 , N
Y is 1 when W═O or NR 25 , and is 2 when W═N;
A is C x H 2x with x=2, 3, 4 or 5 or CH 2 CH(C 6 H 5 );
a is an integer from 2 to 350;
R 24 is H or an unbranched or branched C 1 -C 4 -alkyl group;
R 25 is H or an unbranched or branched C 1 -C 4 -alkyl group;

in which
R 6 is H or an unbranched or branched C 1 -C 4 -alkyl group;
Q is NR 10 , N or O;
Y is 1 when Q=O or NR10, and is 2 when Q=N;
R10 is H or an unbranched or branched C1-C4-alkyl group;
A is CxH2x with x=2, 3, 4 or 5, or CH2C(C6H5)H;
R24 is H or an unbranched or branched C1-C4-alkyl group;
M is H or one cation equivalent; and
a is an integer from 2 to 350.

20 . The process according to claim 17 , wherein the polymeric dispersant (PD) comprises at least one polymer which is a polycondensation product comprising structural units (III) and (IV):

in which
T is a substituted or unsubstituted phenyl radical, a substituted or unsubstituted naphthyl radical or a substituted or unsubstituted heteroaromatic radical having 5 to 10 ring atoms, of which 1 or 2 atoms are heteroatoms selected from N, O and S;
n is 1 or 2;
B is N, NH or O, with the proviso that n is 2 when B is N and the proviso that n is 1 when B is NH or O;
A is C x H 2x with x=2, 3, 4 or 5 or CH 2 CH(C 6 H 5 );
a is an integer from 1 to 300;
R 25 is H, a branched or unbranched C 1 - to C 10 -alkyl radical, C 5 - to C 8 -cycloalkyl radical, aryl radical or heteroaryl radical having 5 to 10 ring atoms, of which 1 or 2 atoms are heteroatoms selected from N, O and S;
where the structural unit (IV) is selected from the structural units (IVa) and (IVb):

in which
D is a substituted or unsubstituted phenyl radical, a substituted or unsubstituted naphthyl radical or a substituted or unsubstituted heteroaromatic radical having 5 to 10 ring atoms, of which 1 or 2 atoms are heteroatoms selected from N, O and S;
E is N, NH or O, with the proviso that m is 2 when E is N and the proviso that m is 1 when E is NH or O;
A is C x H 2x with x=2, 3, 4 or 5 or CH 2 CH(C 6 H 5 );
b is an integer from 1 to 300;
M is independently H or one cation equivalent;

in which
V is a substituted or unsubstituted phenyl radical or a substituted or unsubstituted naphthyl radical;
R 7 is COOM, OCH 2 COOM, SO 3 M or OPO 3 M 2 ;
M is H or one cation equivalent;
w

Assignees

• Basf Se

Inventors

• Gaedt Torben
• Dengler Joachim
• Bichler Manfred

Classifications

• Y02W30/91

  Use of waste materials as fillers for mortars or concrete · CPC title

• C08J2301/28

  Alkyl ethers · CPC title

• C08J2433/26

  Homopolymers or copolymers of acrylamide or methacrylamide · CPC title

• C04B28/14

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

• C08J3/122 Primary

  Pulverisation by spraying · CPC title