Aminofunctional organosiloxanes
Aminofunctional silicone compositions are disclosed comprising: an organopolysiloxane having an average formula of (CH 3 ) 3 SiO[(CH 3 ) 2 SiO] x [(CH 3 )R N SiO] y Si(CH 3 ) 3 with less than 1 weight % of nitrogen in its formula, where R N is an aminofunctional group, x is ≥100, y is ≥1 with the proviso the sum of x+y is from 250 to 350; wherein the viscosity of the silicone composition ranges from 1000 to 2500 cP at 25° C. and is measured by a Brookfield RV DV viscometer equipped with Pro CP 52 spindle at 20 RPM; and the aminofunctional silicone composition contains less than 0.1 weight % of D4 and less than 0.1 weight % D5 cyclic siloxanes.
1. A method of treating a surface of a fiber, the method comprising applying an aqueous emulsion to the surface of the fiber, wherein the aqueous emulsion comprises:
A) an aminofunctional silicone composition comprising an organopolysiloxane having an average formula:
(CH 3 ) 3 SiO[(CH 3 ) 2 SiO] x [(CH 3 )R N SiO] y Si(CH 3 ) 3
with less than 1 weight % of nitrogen in its formula,
where R N is an aminofunctional group, x is ≥100, and y is ≥1, with the proviso that the sum of x+y is from 250 to 350; and
B) a quaternary ammonium surfactant having a formula:
R 1 R 2 R 3 R 4 N + X − ,
where R 1 is a radical containing at least 10 carbon atoms, R 2 is R 1 or a hydrocarbyl containing 1 to 12 carbon atoms, R 3 is R 1 , R 2 , or an alcohol group containing 2 to 10 carbon atoms, R 4 is R 1 , R 2 , or R 3 , and X − is a halide, sulfate, sulfonate, methosulfate, or ethosulfate;
wherein the viscosity of A) the aminofunctional silicone composition ranges from 1000 to 2500 cP at 25° C. as measured by a Brookfield RV DV viscometer equipped with Pro CP 52 spindle at 20 RPM;
wherein A) the aminofunctional silicone composition contains less than 0.1 weight % of octamethylcyclotetrasiloxanes (D4) and less than 0.1 weight % decamethylcyclopentasiloxanes (D5) cyclic siloxanes; and
wherein B) the quaternary ammonium surfactant is present in the aqueous emulsion in an amount of at least 0.5 weight %.
2. The method of claim 1 , wherein the aminofunctional group R N has the formula —CH 2 CH 2 CH 2 NHCH 2 CH 2 NH 2 .
3. The method of claim 1 , wherein A) the aminofunctional silicone composition is present in the aqueous emulsion in an amount of from 15 to 80 weight %.
4. The method of claim 1 , wherein B) the quaternary ammonium surfactant is present in the aqueous emulsion in an amount of from 0.5 to 10 weight %.
5. The method of claim 1 , wherein the aqueous emulsion further comprises:
C) a nonionic surfactant.
6. The method of claim 5 , wherein C) the nonionic surfactant is present in the aqueous emulsion in an amount of from 2 to 8 weight %.
7. The method of claim 1 , wherein:
i) the fiber is selected from the group of natural fibers, regenerated fibers, synthetic fibers, and combinations thereof; and/or
ii) the fiber is selected from the group of textiles, threads, filaments, tows, yarns, woven fabrics, knitted materials, non-woven materials, paper, carpet, leather, and combinations thereof.
8. The method of claim 1 , further comprising the step of drying the surface of the fiber after application of the aqueous emulsion.
9. The method of claim 1 , wherein the aqueous emulsion is applied in an amount to provide 0.1 to 15 weight % of the aqueous emulsion on the fiber based on dry weight of the fiber.