Easily preparable, reduced-VOC, environmentally friendly (meth)acrylamido-functional siloxane systems, process for preparation thereof and use

1. A composition, comprising an acrylamido-functional siloxane obtained by a process comprising:

a) reacting a component A which is an aininoalkyl-functionalized silicon compound selected from the group consisting of (i), (ii) and (iii)

(i) an aminoalkyl-functional alkoxysilane or a mixture of aminoalkyl-functional alkoxysilanes, each in the presence of a defined amount of water,

(ii) a hydrolysis or condensation product of at least one aminoalkyl-functional alkoxysilane, and

(iii) a mixture comprising an aminoalkyl-functional alkoxysilane and a hydrolysis and/or condensation product of at least one aminoalkyl-functional alkoxysilane,

with a component B which is an acrylic anhydride, optionally in the presence of a diluent; and optionally

b) removing a portion of the diluent and/or an alcohol of hydrolysis,

wherein:

the aminoalkyl-functional alkoxysilane is represented by formula:

(R 1 O) 3 Si(B);

B independently represents a group of formula (II) or independently represents a group of formula(III):

—(CH 2 ) c —[(NH)(CH 2 ) d ] e [(NH)(CH 2 ) f ] g NH (2-h) R 3 h   (II),

—(CH 2 ) j —NH 2-p (CH 2 —CH 2 —NH 2 ) p   (III);

each R 1 is independently a linear, branched or cyclic alkyl group having 1 to 8 carbon atoms;

each R 2 is independently a linear, branched or cyclic alkyl group having 1 to 8 carbon atoms;

each R 3 is independently a linear, branched or cyclic alkyl, aryl or alkylaryl group having 1 to 8 carbon atoms;

c is independently selected from the group consisting of 1, 2, 3, 4, 5 and 6;

d is independently selected from the group consisting of 1, 2, 3, 4, 5 and 6;

e is independently selected from the group consisting of 0, 1, 2, 3, 4, 5 and 6;

f is independently selected from the group consisting of 1, 2, 3, 4, 5 and 6;

g is independently selected from the group consisting of 0, 1, 2, 3, 4, 5 and 6;

h is independently 0 or 1;

j represents 1, 2 or 3;

p represents 0, 1 or 2;

the acrylic anhydride is represented by formula (IV):

(CHR 5 =CR 4 CO) 2 O  (IV);

each R 4 is independently a hydrogen atom or a methyl group; and

each R 5 is independently a hydrogen atom or a methyl group.

2. The composition of claim 1 wherein:

the acrylamido-functional siloxane is represented by formula:

(R 1 O)[(R 1 O)Si(C) O] u [(Y)Si(C)O] u R 1 . (HX) z ;

C corresponds to an acrylamido group;

Y corresponds to OR 1 or, in crosslinked and/or three-dimensionally crosslinked structures, independently to OR 1 or O 1/2 ;

each R 1 independently corresponds to a linear, branched or cyclic alkyl group having 1 to 8 carbon atoms, or optionally at least partly corresponds to hydrogen;

each R 2 corresponds to a linear, branched or cyclic alkyl group having 1 to 8 carbon atoms;

HX is an acid, where X is an inorganic or organic acid radical;

u is independently an integer greater than or equal to 2;

u′ is greater than or equal to 0;

z is greater than or equal to 0;

(u +u)≧2; and

the composition is essentially free of diluents.

3. A process for preparing the composition of claim 1 , the process comprising:

reacting the component A

with the component B; and

optionally at least partly removing the diluent and the alcohol of hydrolysis formed in the reaction,

wherein the reacting, the removing, or both, are performed in the presence of water.

4. The process of claim 3 , wherein in the aminoalkyl-functional alkoxysilane:

a) R 1 is independently methyl or ethyl, c=1, 2 or 3, and in group B of the formula II, g=0, e=1, h=0, and d=1, 2, or 3; or

b) R 1 is independently methyl or ethyl, c=3, and in group B of the formula II, g, e and h are each 0 or, alternatively, c =3, and in group B of the formula II, e=1, d=1, 2, or 3, g=0, h=0, or in group B of the formula II, e=g=0 or 1, d=f=2 or 3, h=0, and c=3, or in group B of the formula III, j=3 and p=1 or 2; or

c) R 1 is independently methyl or ethyl, c=2, and in group B of the formula II, g, e and h are each 0 or, alternatively, c=3, and in group B of the formula II, e=1, d=1, 2, or 3, g=0, h=0, or in group B of the formula II, e=g =0 or 1, d=f=2 or 3, h=0, and c=2, or in group B of the formula III, j=3 and p=1 or 2; or

d) R 1 is independently methyl or ethyl, c=1, and in group B of the formula II, g, e and h are each 0 or, alternatively, c=3, and in group B of the formula II, e=1 , d =1, 2, or 3, g=0, h=0, or in group B of the formula II, e=g=0 or 1, d=f=2 or 3, h=0 and c=1, or in group B of the formula III, j=3 and p=1 or 2.

5. The process of claim 3 , wherein the aminoalkyl-functional alkoxysilane of the formula I is selected from the group consisting of 3-aminopropyl trimethoxysilane, 3-aminopropyltriethoxysilane, 1-aminomethyltrimethoxysilane, 1-aminomethyl triethoxysilane, 2-aminoethyltrimethoxysilane, 2-aminoethyltriethoxysilane, 3-aminoisobutyl trimethoxysilane, 3-aminoisobutyltriethoxysilane, N-n-butyl-3-aminopropyltriethoxysilane, N-n-butyl-3-aminopropyltrimethoxysilane, N-n-butyl-1-aminomethyltriethoxysilane, N-n-butyl-1-aminomethyltrimethoxysilane, N-n-butyl-1-aminomethylmethyltriethoxysilane, benzyl-3-aminopropyltrimethoxysilane, benzyl-3-aminopropyltriethoxysilane, benzyl-2-aminoethyl-3-aminopropyltrimethoxy silane, benzyl-2-aminoethyl-3-aminopropyltriethoxysilane, diaminoethylene-3-propyl trimethoxysilane, diaminoethylene-3-propyltriethoxysilane, triaminodiethylene-3-propyl trimethoxysilane, triaminodiethylene-3-propyltriethoxysilane, (2-arninoethylamino) ethyltrimethoxysilane, (2-aminoethylarnino)ethyltriethoxysilane, (1-aminoethylamino) methyltrimethoxysilane and (1-aminoethylamino)methyltriethoxysilane.

6. The process of claim 3 , wherein the acrylic anhydride of the formula IV is methacrylic anhydride or (unsubstituted) acrylic anhydride.

7. The process of claim 3 , wherein the water is present in an amount of 0.1 to 4.5 mol of water per mole of silicon atoms in the aminoalkyl-functional silicon.

8. The process of claim 3 , wherein a defined amount of the water is established prior to the reacting.

9. The process of claim 3 , further comprising:

(Ia)

admixing the component A according to (i) with a defined amount of water, optionally at least partly removing alcohol of hydrolysis and/or added diluent, adding the acrylic anhydride of the formula IV to the resulting mixture, optionally adding a stabilizer to the mixture,

or alternatively

(Ib)

reacting the component A according to (ii) or (iii), optionally in a mixture with a diluent, with acrylic anhydride of the formula IV,

optionally adding a stabilizer to the mixture, and

(IIa)

in one alternative, after (Ia) or (Ib), optionally at least partly removing the added diluent and any alcohol of hydrolysis formed and optionally water formed in the reaction under ambient or reduced pressure and elevated temperature,

or

(IIb)

in a further alternative, after (Ia) or (Ib), adding a base to the mixture, optionally

removing the precipitate, and

adding an organic acid and at least partly removing the alcohol of hydrolysis and/or the diluent.

10. The process of claim 3 , wherein a molar ratio of nitrogen atoms in the aminoalkyl-functional silicon compound to a molar ratio of an acryloylcarbonyl functional group released from the acrylic anhydride of the formula IV is in a range from 1:5 to 5:1.

11. The process of claim 3 , wherein an active ingredient content of acrylamido-functional siloxanes in the overall composition is adjusted to 0.0001 to 99.9% by weight.

12. The process of claim 3 , wherein volatile diluents and alcohol of hydrolysis are removed down to a content in the overall composition of less than or equal to 12% by weight to 0% by weight.

13. The process of claim 3 , wherein the acrylamidoalkyl-functional silanes are removed by distillation.

14. A composition obtained by the process of claim 3 .

15. A formulation,. comprising the composition of claim 1 and at least one further formulation constituent selected from the group consisting of an auxiliary, water, a polymer, a diluent, an additive, a pigment, a filler, an acid, a base and a buffer.

16. An adhesion promoter, comprising the composition of claim 1 .

17. The composition of claim 1 , wherein the aminoalkyl-functional alkoxysilane is selected from the group consisting of 3-aminopropyl trimethoxy silane, 3-aminopropyltriethoxysilane, 1-aminomethyltrimethoxysilane, 1-aminomethyl triethoxysilane, 2-aminoethyltrimethoxysilane, 2-aminoethyltriethoxysilane, 3-aminoisobutyl trimethoxysilane, 3-aminoisobutyltriethoxysilane, N-n-butyl-3-aminopropyl triethoxysilane, N-n-butyl-3-aminopropyltrimethoxysilane, N-n-butyl-1-aminomethyltriethoxysilane, N-n-butyl-1-aminomethyltrimethoxy silane, N-n-butyl-1-aminomethylmethyltriethoxysilane, benzyl-3-aminopropyltrimethoxy silane, benzyl-3-aminopropyltriethoxysilane, benzyl-2-aminoethyl-3-aminopropyltrimethoxy silane, benzyl-2-aminoethyl-3-aminopropyltriethoxy silane, diaminoethylene-3-propyl trimethoxysilane, diaminoethylene-3-propyltriethoxysilane, triaminodiethylene-3-propyl trimethoxysilane, triaminodiethylene-3-propyltriethoxysilane, (2-aminoethylamino) ethyltrimethoxysilane, (2-aminoethylarnino)ethyltriethoxysilane, (1-aminoethylamino) methyltrimethoxysilane and (1-minoethylamino)methyltriethoxysilane.

18. The composition of claim 1 , wherein water is present in the process in an amount of 0.1 to 4.5 mol of water per mole of silicon atoms in the aminoalkyl-functional silicon.