Hydrophobizing of fibrous materials with polyorganosiloxanes
The present invention relates on the use of 1,3-dihydroxyalkyl functionalized polyorganosiloxanes in compositions for the treatment of materials having a fibrous structure, such as leather, furs, textiles and paper. The invention further relates to a process for treating fibrous materials with waterproofing.
1. A process of treating a fibrous substrate comprising applying a polyorganosiloxane a) including at least one 1,3-dihydroxy alkyl moiety and at least one polyorganosiloxane b)—different from polyorganosiloxane a)—wherein polyorganosiloxane b) includes at least one organic group bound to a polyorganosiloxane backbone via an Si—C-bond, said at least one organic group comprising at least one polar functional group;
or salts of polyorganosiloxane b).
2. The process of claim 1 , wherein the fibrous substrate is selected from the group consisting of leather, furs and leather substitutes.
3. The process of claim 1 , wherein treating the fibrous substrate includes hydrophobic treatment.
4. The process of claim 1 , wherein the polyorganosiloxane a) is selected from polyorganosiloxanes having pendant and/or terminal 1,3-dihydroxy alkyl moieties.
5. The process of claim 1 , wherein 1,3-dihydroxy alkyl moieties are bound to a silicon atom of the polyorganosiloxane moiety via a carbon atom.
6. The process of claim 1 , wherein the polyorganosiloxane a) has a 1,3-dihydroxy alkyl moiety of the formula:
-A-(B) v ,
wherein A is a di- or trivalent organic residue having up to 30 carbon atoms bound to a silicon atom of the polyorganosiloxane moiety via a carbon atom, B is an optionally substituted 1,3-dihydroxypropanyl moiety bound to the group A and v=1 or 2.
7. The process of claim 1 , wherein the polyorganosiloxane a) has the formula:
wherein a is 0 to 3,
x is 0 to 1100,
y is 0 to 100,
x+y is 0 to 1000,
a+y is ≧1,
wherein A is a di- or trivalent organic residue having up to 30 carbon atoms bound to a silicon atom of the polyorganosiloxane moiety via a carbon atom, B is an optionally substituted 1,3-dihydroxypropanyl moiety bound to the group A, and
R is an organic group having up to 25 carbon atoms.
8. The process of claim 1 , wherein the polyorganosiloxane a) has the formula:
wherein a is 0 to 3,
x is 10 to 1000,
y is 0 to 100,
x+y is 10 to 1100,
a+y is ≧1,
wherein A is a di- or trivalent organic residue having up to 30 carbon atoms bound to a silicon atom of the polyorganosiloxane moiety via a carbon atom, B is an optionally substituted 1,3-dihydroxypropanyl moiety bound to the group A, and
R is an organic group having up to 25 carbon atoms.
9. The process of claim 1 , wherein the polyorganosiloxane a) has the formula:
wherein
x is 10 to 1000, and
y is 0 to 100.
10. The process of claim 1 , wherein the polyorganosiloxane a) is used in a composition comprising at least one solvent, selected from the group consisting of water and organic solvents.
11. The process of claim 1 , wherein 1-200 parts by weight of polyorganosiloxane b) is present per 100 parts by weight of polyorganosiloxane a).
12. The process of claim 1 , wherein the composition further comprises at least one component selected from
component c), an organic silicon-free compound having at least one carboxy group or a salt thereof, and
component d), at least one surfactant, different from component a) to c).
13. The process of claim 1 , wherein polyorganosiloxanes a) and b) are present in the form of an aqueous emulsion.
14. The process of claim 1 , wherein polyorganosiloxanes a) and b) are provided in a solution together with at least one organic solvent.
15. The process of claim 1 , wherein the fibrous substrate is selected from tanned leather and dried leather, and the polyorganosiloxane a) is provided in a solution together with at least one organic solvent, wherein the process further comprises the step of drying the leather to remove the volatile organic solvent.
16. The process of claim 1 , wherein the fibrous substrate is selected from tanned, leather and dried leather, and the polyorganosiloxane a) and polyorganosiloxane b) are provided in a solution together with at least one organic solvent, wherein the process further comprises the step of drying the leather to remove the volatile organic solvent.
17. A fibrous product treated according to the process of claim 1 .
18. A fibrous product treated according to the process of claim 7 .
19. A fibrous product treated according to the process of claim 8 .
20. A fibrous product treated according to the process of claim 9 .