Linear carboxy-functional organosiloxanyl derivatives and the use thereof for the treatment of the surfaces of leather
View Patent ↗The invention relates to linear carboxy-functional organosiloxane compounds of the general formula (I) in which a is from 1 to 200, R 1 are identical or different aliphatic or aromatic hydrocarbon radicals and R 2 is —(Y)[O(C 2 H 4-b (R 3 ) b O) c (C d H 2d O) e ] f X, and the use thereof for the treatment of the surface of leather.
1. A linear carboxy-functional organosiloxane compound of the general formula (I)
in which
a is from 1 to 200,
R 1 are identical or different aliphatic or aromatic hydrocarbon radicals,
R 2 is —(Y)[O(C 2 H 4-b (R 3 ) b O) c (C d H 2d O) e ] f X,
where
Y is an (f+1)-valent, optionally branched hydrocarbon radical having 3 to 12 C atoms,
b is from 1 to 3,
c is from 0 to 20,
d is from 2 to 4,
e is from 0 to 20,
f is from 1 to 4,
R 3 is R 1 ,
X is C(O)-Z-CO 2 H and
Z is a divalent hydrocarbon radical selected from the group consisting of
where
g is from 1 to 12;
R a is alkyl; and
y is 0 to 4.
2. The linear carboxy-functional organosiloxane as claimed in claim 1 , wherein the radical R 2 is a polyether radical comprising mixed blocks.
3. The linear carboxy-functional organosiloxanes a claimed in claim 1 , wherein R 1 is a C 1 –C 5 aliphatic hydrocarbyl group or a C 6 to C 12 aromatic group.
4. The linear carboxy-functional organosiloxane as claimed in claim 1 , wherein R 1 is H and/or methyl.
5. The linear carboxy-functional organosiloxane as claimed in claim 1 , wherein a has a value of from 10 to 150.
6. The linear carboxy-functional organosiloxane as claimed in claim 1 , wherein z is
7. The linear carboxy-functional organosiloxane as claimed in claim 1 which has the formula
wherein
R a is identical or different and is a C 1 –C 4 -alkyl radical,
R 1 is methyl;
a is from 1 to 150;
z is 3 to 12;
c is from 0 to 4; and
y is from 0 to 4.
8. The linear carboxy-functional organosiloxane as claimed in claim 7 wherein R a is methyl and y is 1.
9. The linear carboxy-functional organosiloxane as claimed in claim 7 wherein
R 1 is CH 3 ;
a is from 1 to 150;
z is 3 or 6; and
c is 0 or 4; and
y is 0.
10. A process for the preparation of linear carboxy-functional polysiloxanes as claimed in claim 1 , which comprises reacting hydroxy-functional siloxanes of the general formula
in which
a is from 1 to 200,
R 1 are identical or different aliphatic or aromatic hydrocarbon radicals,
R 4 is —(Y)[O(C 2 H 4-b (R 3 ) b O) c (C d H 2d O) e ] f H,
where
Y is an (f+1)-valent, optionally branched hydrocarbon radical having 3 to 12 C atoms,
b is from 1 to 3,
c is from 0 to 20,
d is from 2 to 4,
e is from 0 to 20 and
f is from 1 to 4,
with organic carboxylic anhydrides of the general formula
in which
Z is a divalent hydrocarbon radical selected from the group consisting of
where
g is 1 to 12
R a is alkyl;
y is 0 to 4.
11. A leather treatment formulation which comprises from about 0.01 to about 50.0% by weight, based upon total weight of the formulation, of at least one linear carboxy-functional polysiloxane as claimed in claim 1 , a solvent, and optionally an additive.
12. The leather treatment formulation as claimed in claim 11 , wherein the solvent is an aqueous solvent.
13. The leather treatment formulation according to claim 11 wherein the additive is an emulsifier, liquid paraffin or mineral oil.
14. The leather treatment formulation as claimed in claim 11 wherein the amount of carboxy-functional polysiloxane is between about 0.01 to about 20% by weight.
15. A method for providing water repellancy to leather which comprises applying the leather treatment formulation as claimed in claim 11 to the surface of the leather.