Process for the preparation of amine-amide-functional siloxanes

1. A process for the preparation of amine-amide-functional siloxanes, comprising:

reacting SiOH-functional siloxanes of the general formula I with amino-functional silanes of the general formula II in the presence of carboxylic acid anhydrides and optionally in the presence of alcohols, amines, and/or alkanolamines at temperatures of 40-180° C.;

wherein the formula I is represented by:

M OH a D b T c Q d   Formula I;

where:

M OH =[HO—SiR 1 2 O 1/2 ];

D=[SiR 1 2 O 2/2 ];

T=[SiR 1 O 3/2 ];

Q=[SiO 4/2 ];

a=2-10;

b=5-150;

c=0-10;

d=0-10; and

R 1 =identical or different radicals from the group: alkyl radicals having 1-30 carbon atoms, aryl radicals having 6-30 carbon atoms, alkaryl radicals having 7-30 carbon atoms;

wherein the formula II is represented by:

R 1 e (R 2 O) f SiR 3   Formula II;

where:

e=0, 1 or 2;

f=1, 2 or 3;

with the proviso that e+f=3;

R 2 =identical or different alkyl radicals having 1-30 carbon atoms or aryl radicals having 6-30 carbon atoms or alkaryl radicals having 7-30 carbon atoms; and

R 3 =identical or different organic radicals which carry at least one amino function;

wherein one or more trialkylalkoxysilanes of the formula VI or bis(trialkylsilyl)amines of the general formula VII are reacted as further reaction component in the presence of carboxylic acid anhydrides at temperatures of 40-180° C.;

wherein the formula VI is represented by:

R 9 3 Si(OR 2 )  Formula VI;

and

wherein the formula VII is represented by:

(R 9 3 Si) 2 NR 5   Formula VII;

where:

R 5 =an alkyl radical having 1-12 carbon atoms, or an aryl radical having 6-12 carbon atoms, or an alkaryl radical having 7-12 carbon atoms, or H; and

R 9 =identical or different alkyl radicals having 1 to 30 carbon atoms.

2. The process for the preparation of amine-amide-functional siloxanes according to claim 1 ;

wherein R 3 in formula II is a radical of the general formula III:

—(CR 4 2 ) g [NR 5 —(CR 4 2 ) i ] h NR 5 2   Formula III;

where:

g=identical or different integers from 1-6;

h=identical or different integers from 0-6;

i=identical or different integers from 1-6;

R 4 =identical or different alkyl radicals having 1-12 carbon atoms, or aryl radicals having 6-12 carbon atoms or alkaryl radicals having 7-12 carbon atoms or H; and

R 5 =identical or different alkyl radicals having 1-12 carbon atoms, or aryl radicals having 6-12 carbon atoms or alkaryl radicals having 7-12 carbon atoms or H.

3. The process for the preparation of amine-amide-functional siloxanes according to claim 1 ;

where the following apply:

c=0;

d=0; and

a=2.

4. The process for the preparation of amine-amide-functional siloxanes according to claim 1 ;

where R 1 =Me.

5. The process for the preparation of amine-amide-functional siloxanes according to claim 1 ;

where the following apply:

R 4 =H;

R 5 =H;

h=0; and

g=1-5.

6. The process for the preparation of amine-amide-functional siloxanes according to Claim 1 ;

where the following apply:

R 4 =H;

R 5 =H;

h=1 or 2;

g=1-5; and

i=1-5.

7. The process for the preparation of amine-amide-functional siloxanes according to claim 1 ;

wherein the amino-functional silanes of the formula II are selected from the group consisting of:

(EtO) 3 Si(CH 2 ) 3 NH 2 , (MeO) 3 Si(CH 2 ) 3 NH 2 , Me(EtO) 2 Si(CH 2 ) 3 NH 2 , Me(MeO) 2 Si(CH 2 ) 3 NH 2 , (EtO) 3 Si(CH 2 ) 3 NH(CH 2 ) 2 NH 2 , (MeO) 3 Si(CH 2 ) 3 NH(CH 2 ) 2 NH 2 , Me(EtO) 2 Si(CH 2 ) 3 NH(CH 2 ) 2 NH 2 , Me(MeO) 2 Si(CH 2 ) 3 NH(HCH) 2 NH 2 , (EtO) 3 SiCH 2 NH 2 , and (MeO) 3 SiCH 2 NH 2 .

8. The process for the preparation of amine-amide-functional siloxanes according to claim 1 ;

wherein the carboxylic acid anhydrides are selected from the group consisting of:

anhydrides of linear or branched, saturated or unsaturated alkylcarboxylic acids, acetic anhydride, propionic anhydride, butyric anhydride or isononanoic anhydride, succinic anhydride, itaconic anhydrides, maleic anhydride, glutaric anhydride, phthalic anhydride, and hexahydrophthalic anhydride.

9. The process for the preparation of amine-amide-functional siloxanes, more than half of the chain ends of which are no longer capable of condensation, according to claim 1 ;

wherein one or more bis(trialkylsilyl)amines are added as further reaction component.

10. The process for the preparation of amine-amide-functional siloxanes according to claim 1 ;

wherein one or more polyfunctional alcohols are added as further reaction component.

11. The process for the preparation of amine-amide-functional siloxanes according to Claim 1 ;

wherein the reaction is carried out at least at times at pressures of below 500 mbar.

12. The process for the preparation of amine-amide-functional siloxanes according to claim 1 ;

wherein the quantitative ratio between amino-functional silane and carboxylic acid anhydride is from 1/0.9 to 1/0.02.

13. A composition obtained by the process of claim 1 , containing:

amide-amine-siloxanes of the general formula IV:

M OR j M k D l T m Q n M′ o D′ p T′ q   Formula IV;

where:

M OR =[R 6 OSiR 1 2 O 1/2 ];

M=[R 1 3 SiO 1/2 ];

D=[SiR 1 2 O 2/2 ];

T=[SiR 1 O 3/2 ];

Q=[SiO 4/2 ];

M′=[R 7 SiR 1 2 O 1/2 ];

D′=[SiR 1 R 7 O 2/2 ];

T′=[SiR 7 O 3/2 ];

R 1 =identical or different radicals from the group: alkyl radicals having 1-30 carbon atoms, aryl radicals having 6-30 carbon atoms, alkaryl radicals having 7-30 carbon atoms;

R 6 =R 2 or H;

R 2 =identical or different alkyl radicals having 1-30 carbon atoms or aryl radicals having 6-30 carbon atoms or alkaryl radicals having 7-30 carbon atoms; and

R 7 =identical or different organic radicals;

with the proviso that each molecule of the formula IV carries, in statistical terms, at least one amine radical of the general formula III and moreover at least one amide radical of the general formula V;

wherein the formula III is represented by:

—(CR 4 2 ) g [NR 5 —(CR 4 2 ) i ] h NR 5 2   Formula III;

and

wherein the formula V is represented by:

—(CR 5 2 ) g [NR 8 —(CR 5 2 ) i ] h NR 8 2   Formula V;

where:

g=identical or different integers from 1-6;

h=identical or different integers from 0-6;

i=identical or different integers from 1-6;

R 4 =identical or different alkyl radicals having 1-12 carbon atoms, or aryl radicals having 6-12 carbon atoms or alkaryl radicals having 7-12 carbon atoms or H;

R 5 =identical or different alkyl radicals having 1-12 carbon atoms, or aryl radicals having 6-12 carbon atoms or alkaryl radicals having 7-12 carbon atoms or H; and

R 8 =R 5 , or a carboxylic acid- or carboxylate-containing group, with the proviso that at least one of the two R 8 radicals in the formula V is a carboxylic acid- or carboxylate-containing group;

where:

j=0-10; and

k=0-10;

with the proviso that j+k is greater than or equal to 2;

where:

l=10-3000;

m=0-20;

n=0-20; and

o=0-10; and

where:

p=0-20; and

q=0-20;

with the proviso that o+p is greater than or equal to 2.

14. The composition of claim 13 ;

where the following apply:

in =0;

n=0; and

j+k=2.

15. The process of Claim 2 ;

wherein:

c=0, d=0, a=2;

R 1 =Me;

R 4 =H;

R 5 =H; and

h=0, g=1-5;

wherein the amino-functional silanes of the formula II are selected from the group consisting of:

(EtO) 3 O) 3 SH) 3 NH 2 , (MeO) 3 Si(CH 2 ) 3 NH 2 , Me(EtO) 2 Si(CH 2 ) 3 NH 2 , Me(MeO) 2 Si(CH 2 ) 3 NH 2 , (EtO) 3 Si(CH 2 ) 3 NH(CH 2 ) 2 NH 2 , (MeO) 3 Si(CH 2 ) 3 NH(CH 2 ) 2 NH 2 , Me(EtO) 2 Si(CH 2 ) 3 NH(CH 2 ) 2 NH 2 , Me(MeO) 2 Si(CH 2 ) 3 NH(CH 2 ) 2 NH 2 , (EtO) 3 SiCH 2 NH 2 , and (MeO) 3 SiCH 2 NH 2 ; and

wherein the carboxylic acid anhydrides are selected from the group consisting of:

anhydrides of linear or branched, saturated or unsaturated alkylcarboxylic acids, acetic anhydride, propionic anhydride, butyric anhydride or isononanoic anhydride, succinic anhydride, itaconic anhydrides, maleic anhydride, glutaric anhydride, phthalic anhydride, and hexahydrophthalic anhydride.

16. The process of Claim 2 ;

wherein:

c=0, d=0, a=2;

R 1 =Me;

R 4 =H;

R 5 =H; and

h=1 or 2, g=1-5, i=1-5;

wherein the amino-functional silanes of the formula II are selected from the group consisting of:

(EtO) 3 Si(CH 2 ) 3 NH 2 , (MeO) 3 Si(CH 2 ) 3 NH 2 , Me(EtO) 2 Si(CH 2 ) 3 NH 2 , Me(MeO) 2 Si(CH 2 ) 3 NH 2 , (EtO) 3 Si(CH 2 ) 3 NH(CH 2 ) 2 NH 2 , (MeO) 3 Si(CH 2 ) 3 NH(CH 2 ) 2 NH 2 , Me(EtO) 2 Si(CH 2 ) 3 NH(CH 2 ) 2 NH 2 , Me(MeO) 2 Si(CH 2 ) 3 NH(CH 2 ) 2 NH 2 , (EtO) 3 SiCH 2 NH 2 , and (MeO) 3 SiCH 2 NH 2 ; and

wherein the carboxylic acid anhydrides are selected from the group consisting of:

anhydrides of linear or branched, saturated or unsaturated alkylcarboxylic acids, acetic anhydride, propionic anhydride, butyric anhydride or isononanoic anhydride, succinic anhydride, itaconic anhydrides, maleic anhydride, glutaric anhydride, phthalic anhydride, and hexahydrophthalic anhydride.