Use of organofunctionally modified polysiloxanes containing phenyl derivatives as dispersants and wetting agents for fillers and pigments in aqueous pigment pastes and ink or paint formulations
View Patent ↗The invention relates to the use of organofunctionally modified polysiloxanes containing phenyl derivatives as dispersants for preparing aqueous pigment formulations, paints, coating materials, and coatings. For the purposes of this invention the term “polysiloxanes” shall be understood to embrace oligomeric siloxanes as well.
1. An aqueous pigment formulation which comprises about 5 to about 80 parts by weight of a pigment, 0 to about 20 parts by weight of a dispersing resin, about 0.1 to about 5 parts by weight of at least one auxiliary and/or additive, 0 to 20 parts by weight solvent about 3 to about 50 parts by weight of at least one organofunctional modified polysiloxane of the general formula
in which
R is in each case identical or different and is R 1 or —CH 3 ,
R 1 is —(CH 2 ) e —O —(CH 2 —CH(Ph)—O) e —(C n H 2n-x R 2 x —O) d —R 3 wherein e is ≧1, or
R 1 is at least one —(CH 2 ) c —O—(CH 2 —CH(Ph)—O) e —(C n H 2n-x R 2 x —O) d —R 3 and is at least one —CH 2 —CHR*—Ph wherein e is 0 or >1, with the proviso that if e is 0 the value of b is an integer >1;
R* is H or —CH 3 ,
R 2 is an alkyl residue having 1 to 5 carbon atoms,
Ph is a phenyl derivative having the general formula
—(C 6 H 5-y R 4 y )—
in which
R 4 is a hydroxyl residue, an alkyl residue or an alkoxy residue, and
y is from 0 to 5,
R 3 is hydrogen, an alkyl chain, a benzyl residue, an alkyl-substituted benzyl residue, a group COR 5 with a residue R 5 which has an alkyl chain, a group CONHR 6 with a residue R 6 which comprises a hydrogen atom or an alkyl chain, or CO 2 R 7 , wherein R 7 is alkyl chain,
c is from 2 to 6,
d is from 3 to 70,
n is from 2 to 4,
x is 0 or 1,
a is from 0 to 100,
b is from 1 to 100,
with the proviso that a+b=1 to 100; and
the remainder water.
2. The aqueous pigment formulation according to claim 1 , wherein the pigment is an organic pigment.
3. The aqueous pigment formulation according to claim 2 , wherein the organic pigment is an azo pigment, a polycyclic pigment, a diketopyrrrolopyrrole or a quinophthalone.
4. The aqueous pigment formulation according to claim 1 , wherein the pigment is an inorganic pigment.
5. The aqueous pigment formulation according to claim 1 , wherein the inorganic pigment is an iron oxide, a spinel pigment, an ultramarine pigment titanium dioxide, or carbon black.
6. An aqueous pigment formulation of claim 1 , wherein the at least one organofunctional modified polysiloxane of the general formula
in which
R is in each case identical or different and is R 1 or —CH 3 ,
R 1 is —(CH 2 ) e —O—(CH 2 —CH(Ph)—O) e —(C a H 2n-x R 2 x —O) d —R 3 wherein e is >1, or
R 1 is at least one —(CH 2 ) c —O—(CH 2 —CH(Ph)—O) e —(C n H 2n-x R 2 x —O) d —R 3 and is at least one —CH 2 —CHR*—Ph wherein e is 0 or ≧1, with the proviso that if e is 0 the value of b is an integer >1;
R* is H or —CH 3 ,
R 2 is an alkyl residue having 1 to 5 carbon atoms, preferably —CH 3 ,
Ph is a phenyl derivative having the general formula
—(C 6 H 5-y R 4 y )—
in which
R 4 is a hydroxyl residue, an alkyl residue or an alkoxy residue, and
y is from 0 to 5,
R 3 is hydrogen, an alkyl chain, a benzyl residue, an alkyl-substituted benzyl residue, a group COR 5 with a residue R 5 which has an alkyl chain, a group CONHR 6 with a residue R 6 which comprises a hydrogen atom or an alkyl chain, or CO 2 R 7 wherein R 7 is an alkyl chain,
c is from 2 to 6,
d is from 3 to 70,
n is 2 or 3,
x is 0 or 1,
a is from 0 to 100,
b is from 1 to 100,
with the proviso that a+b=1 to 100; and
further optionally comprises a filler.
7. A method for dispersing at least one pigment and optionally a filler in the aqueous pigment formulation of claim 1 said process comprises mixing in an aqueous dispersing medium the pigment and optionally the filler with at least one organofunctional modified polysiloxane of the general formula
in which
R is in each case identical or different and is R 1 or —CH 3 ,
R 1 is —CH 2 ) c —O —(CH 2 —CH(Ph)—O) e —(C n H 2n-a R 2 x —O) d —R 3 wherein e is ≧1, or
R 1 is at least one —(CH 2 ) e —O—(CH 2 —CH(Ph)—O) e —(C n H 2n-x R 2 x —O) d —R 3 and is at least one —CH 2 —CHR*—Ph wherein e is 0 or ≧1, with the proviso that if e is 0 the value of b is an integer >1;
R* is H or —CH 3 ,
R 2 is an alkyl residue having 1 to 5 carbon atoms,
Ph is a phenyl derivative having the general formula
—(C 6 H 5-y R 4 y )—
in which
R 4 is a hydroxyl residue, an alkyl residue or an alkoxy residue, and
y is from 0 to 5,
R 3 is hydrogen, an alkyl chain, a benzyl residue, an alkyl-substituted benzyl residue, a group COR 5 with a residue R 5 which has an alkyl chain a group CONHR 6 with a residue R 6 which comprises a hydrogen atom or an alkyl chain, or CO 2 R 7 , wherein R 7 is alkyl chain,
c is from 2 to 6,
d is from 3 to 70,
n is from 2 to 4,
x is 0 or 1,
a is from 0 to 100,
b is from 1 to 100,
with the proviso that a+b=1 to 100.
8. The method according to claim 7 wherein the organofunctional modified polysiloxane is a compound of the formula
in which
R is in each case identical or different and is R 1 or —CH 3 ,
R 1 is —(CH 2 ) c —O —(CH 2 —CH(Ph)—O) e —(C n H 2n-x R 2 x —O) d —R 3 wherein e is ≧1, or
R 1 is at least one —(CH 2 ) e —O—(CH 2 —CH(Ph)—O) e —(C n H 2n-x R 2 —O) d —R 3 and is at least one —CH 2 —CHR*—Ph wherein e is 0 or ≧1, with the proviso that if e is 0 the value of b is an integer >1;
R* is H or —CH 3 ,
R 2 is an alkyl residue having 1 to 5 carbon atoms,
Ph is a phenyl derivative having the general formula
—(C 6 H 5-y R 4 y )—
in which
R 4 is a hydroxyl residue, an alkyl residue having 1 to 6 carbon atoms or an alkoxy residue having 1 to 6 carbon atoms, and
y is from 0 to 5,
R 3 is hydrogen, an alkyl chain having 1 and up to 18 carbon atoms, a benzyl residue, an alkyl-substituted benzyl residue having up to four carbon atoms in the alkyl residue, a group COR 5 with a residue R 5 which has an alkyl chain having 1 to 18 carbon atoms, a group CONHR 6 with a residue R 6 which comprises a hydrogen atom or an alkyl chain having 1 to 18 carbon atoms, or CO 2 R 7 , which has an alkyl chain R 7 having 1 to 18 carbon atoms,
c is from 2 to 6,
d is from 3 to 70,
n is from 2 to 4,
x is 0 or 1,
a is from 0 to 100,
b is from 1 to 100,
with the proviso that a+b=1 to 100.
9. The method according to claim 7 , wherein R 1 in formula (I) is the residue —(CH 2 ) 2-3 —O —(CH 2 —CH(Ph)—O) 1-4 —(C 2 H 4 —O) 3-50 —H.
10. The method according to claim 7 where the aqueous pigment formulation comprises a filler.
11. The aqueous pigment formulation according to claim 7 wherein the filler is chalk, talc, kaolin or silicate.
12. The aqueous pigment formulation according to claim 7 , which further comprises the auxiliary and/or additive is a defoamer, biocide, antisettling agent, neutralizing agent, thickeners, humectant, stabilizing agent, siccative, light stabilizer.