Plasters and renders and paints, copolymer dispersions and their use
View Patent ↗Plasters and renders and paints, copolymer dispersions and their use Compositions containing selected polymer dispersions, colloidal silica, fillers and pigments are described. These can be formulated to give plasters and renders or paints which are distinguished by excellent abrasion resistance, little tendency to soiling, high water vapor permeability, good adhesion and good weathering stability. The compositions according to the invention can be processed to give plasters and renders or paints which have a nanostructured surface and which differ from conventionally produced surfaces.
1. A composition containing
a) mineral filler, the proportion of particles having a diameter of at least 40 μm being at least 40% by weight, wherein the mineral filler is present in an amount of from 50 to 80% by weight, based on the total formulation,
b) pigment,
c) colloidal silica and
d) aqueous plastics dispersion which contains a copolymer which is prepared by emulsion polymerization and is derived from
A) at least 40% by weight, based on the total amount of monomer, of esters of α,β-unsaturated carboxylic acids, vinyl esters of saturated carboxylic acids, vinylaromatic monomers or combinations of two or more of these monomers,
B) from 0.1 to 10% by weight, based on the total amount of monomers, of α,β-ethylenically unsaturated mono- and/or dicarboxylic acids and/or of α,β-ethylenically unsaturated sulfonic acids and/or of α,β-ethylenically unsaturated phosphoric acids and/or of α,β-ethylenically unsaturated phosphonic acids and/or of amides of α,β-ethylenically unsaturated mono- and/or dicarboxylic acids,
C) from 0.5 to 15% by weight, based on the total amount of monomers, of ethylenically unsaturated monomers which have at least one alkoxysilyl group,
D) from 0.1 to 10% by weight, based on the total amount of monomers, of an ethylenically unsaturated surface-active monomer containing at least one anionic and/or nonionic emulsifying group and
E) optionally up to 20% by weight, based on the total amount of monomers, of other monomers copolymerizable with the monomers of groups A), B), C) and D), with the proviso that,
instead of or in addition to the copolymerization of the monomer C), from 0.5 to 15% by weight, based on the total amount of monomers, of a monomer which has at least one amino, mercapto or epoxide group in addition to at least one alkoxysilyl group is added after the emulsion polymerization.
2. The composition as claimed in claim 1 , which additionally contains e) water-soluble silicate and/or f) silicone resin.
3. The composition as claimed in claim 1 , wherein the colloidal silica c) has a mean diameter of from 2 to 100 nm and is present in an amount of from 5 to 200% by weight, based on the amount of the copolymer.
4. The composition as claimed in claim 2 , wherein the water-soluble silicate is alkali waterglass.
5. The composition as claimed in claim 1 , which contains colloidal silica c) added after the emulsion polymerization.
6. The composition as claimed in claim 1 , wherein the mineral filler a) is calcium carbonate, quartz and/or a silicate filler.
7. The composition as claimed in claim 1 , wherein the pigment b) is titanium dioxide, iron oxide, zinc oxide and/or a phthalocyanine pigment and is present in an amount of from 1 to 50% by weight, based on the total formulation.
8. The composition as claimed in claim 2 , wherein the silicone resin is a polydimethylsiloxane.
9. The composition as claimed in claim 1 , wherein component A) is an acrylate and/or a methacrylate, optionally in combination with styrene.
10. The composition as claimed in claim 1 , wherein component A) is a vinyl ester of a saturated carboxylic acid having one to four carbon atoms.
11. The composition as claimed in claim 1 , wherein component B) is acrylic acid, methacrylic acid or vinylsulfonic acid.
12. The composition as claimed in claim 1 , wherein component C) is vinyltrialkoxysilane.
13. The composition as claimed in claim 1 , wherein component D) is derived from compounds of the formulae X, XI, XII, XIII, XIV, XV, XVI, XVII, XVIII, XIX, XX, XXI, XXII, XXIII, XXIV, XXV, XXVI, XXVII, XXVIII, XXIX, XXX, XXXI, XXVII and XXXIII
in which R 20 and R 21 , independently of one another, are hydrogen or C 1 -C 4 -alkyl,
R 22 is C 6 -C 30 -alkyl, C 6 -C 30 -alkenyl or C 7 -C 30 -alkylaryl,
M is an alkali metal cation, an ammonium ion or hydrogen,
R 25 , R 26 and R 27 , independently of one another, are hydrogen, C 1 -C 30 -alkyl, C 2 -C 30 -alkenyl, cycloalkyl, aryl or acyl,
n and m, independently of one another, are integers from 1 to 4,
p is an integer from 2 to 4,
q is an integer from 1 to 100,
R 24 is hydrogen, C 1 -C 30 -alkyl, C 2 -C 30 -alkenyl, cycloalkyl, aryl or acyl,
r is an integer from 0 to 100,
R 28 is C 2 -C 4 -alkenyl,
s is an integer from 0 to 100,
t is 1 or 2,
R 29 is C 1 -C 30 -alkyl,
u is an integer from 1 to 20,
v and w, independently of one another, are integers from 0 to 100, at least one of the numbers v or w not being equal to zero,
R 30 is hydrogen or C 1 -C 4 -alkyl,
R 31 is an alkenyl radical or a carboxyalkenyl radical having 6 to 30 carbon atoms and
R 32 is hydrogen, C 1 -C 4 -alkyl or a radical of the formula PO 4-t M 3-t .
14. The composition as claimed in claim 13 , wherein component D) is derived from compounds of the formula XVa
in which q, R 22 and M has the meaning defined in claim 13 .
15. The composition as claimed in claim 1 , which contains at least one nonionic emulsifier.
16. A composition containing
a) mineral filler, the mean diameter of the particles being from 1 to 40 μm, wherein the mineral filler is present in an amount of from 20 to 60% by weight, based on the total formulation,
b) pigment,
c) colloidal silica and
d) aqueous plastics dispersion which contains a copolymer which is prepared by emulsion polymerization and is derived from
A) at least 40% by weight, based on the total amount of monomer, of esters of α,β-unsaturated carboxylic acids, vinyl esters of saturated carboxylic acids, vinylaromatic monomers or combinations of two or more of these monomers,
B) from 0.1 to 10% by weight, based on the total amount of monomers, of α,β-ethylenically unsaturated mono- and/or dicarboxylic acids and/or of α,β-ethylenically unsaturated sulfonic acids and/or of α,β-ethylenically unsaturated phosphoric acids and/or of α,β-ethylenically unsaturated phosphonic acids and/or of amides of α,β-ethylenically unsaturated mono- and/or dicarboxylic acids,
C) from 0.5 to 15% by weight, based on the total amount of monomers, of ethylenically unsaturated monomers which have at least one alkoxysilyl group,
D) from 0.1 to 10% by weight, based on the total amount of monomers, of an ethylenically unsaturated surface-active monomer containing at least one anionic and/or nonionic emulsifying group and
E) optionally up to 20% by weight, based on the total amount of monomers, of other monomers copolymerizable with the monomers of groups A), B), C) and D), with the proviso that,
instead of or in addition to the copolymerization of the monomer C), from 0.5 to 15% by weight, based on the total amount of monomers, of a monomer which has at least one amino, mercapto or epoxide group in addition to at least one alkoxysilyl group is added after the emulsion polymerization.