Process for making an aminosiloxane polymer nanoemulsion

A method of making an aqueous nanoemulsion, comprising the steps of, in the order given for steps c) through h):

• a) solubilizing a silicone resin in an organic solvent system to yield a silicone resin solution concentration of 80% or less, wherein the organic solvent system comprises a single solvent selected from the group consisting of monoalcohols, polyalcohols, ethers of monoalcohols, ethers of polyalcohols, fatty esters, Guerbet alcohols, isoparaffins, naphthols, glycol ethers, provided that if the solvent is a glycol ether it is not diethyleneglycol monobutyl ether;
• b) mixing the silicone resin solution from a) with an aminoalkyl-containing polyorganosiloxane (P) comprising at least 80 mol % of units of the formulae 7, 8, 9 and 10
• R12SiO(4-a-b)/2 (7),
• R1aR2bSiO(4-a-b)/2 (8),
• R33SiO(1/2) (9),
• R32R4SiO(1/2) (10),
• where
• a is 0 or 1,
• b is 1 or 2,
• a+b is 2,
• R1 are monovalent hydrocarbyl radicals having 1-40 carbon atoms, optionally substituted with halogens,
• R2 are either
• a) aminoalkyl radicals of the formula 11
• —R5—NR6R7 (11)
• where
• R5 are divalent hydrocarbyl radicals having 1-40 carbon atoms,
• R6 are monovalent hydrocarbyl radicals having 1-40 carbon atoms, H, hydroxymethyl or alkanoyl radicals, and
• R7 are radicals of the formula 12
• —(R8—NR6)xR6 (12)
• where
• x is 0 or an integer from 1 to 40, and
• R8 is a divalent radical of the formula 13
• —(CR92-)y (13)
• where
• y is an integer from 1 to 6, and
• R9 are H or a hydrocarbyl radical having 1-40 carbon atoms, or
• b) in the formula 11, R6 and R7 combine with nitrogen to form a cyclic organic radical having 3 to 8 —CH2— units, wherein nonadjacent —CH2— units are optionally replaced by —C(═O)—, —NH—, —O— or —S—, units
• R3 are hydrocarbyl radicals having 1-40 carbon atoms, and optionally substituted with halogens,
• R4 are —OR or —OH radicals, and
• wherein, in the polyorganosiloxanes (P),
• the average ratio of the sum of units of the formulae 7 and 8 to the sum of units of the formulae 9 and 10 is in the range from 0.5 to 500, the average ratio of units 9 to 10 is in the range from 1.86 to 100, and the polyorganosiloxanes (P) have an average amine number of at least 0.01 mequiv/g, to obtain an aminosiloxane polymer:silicone resin mixture having ratio of 20:1;
• c) allowing the aminosiloxane polymer:silicone resin mixture to age for at least 6 hours at ambient temperature;
• d) introducing or maintaining the aminosiloxane polymer:silicone resin mixture to a vessel;
• e) optionally adding with agitation, an additional organic solvent to the aminosiloxane polymer:silicone resin mixture;
• f) mixing until homogenous;
• g) adding a protonating agent;
• and
• h) adding an aqueous carrier in an amount to produce the aqueous nanoemulsion.