Compositions for aqueous delivery of self-emulsifying fluorinated alkoxysilanes

An aqueous dilution comprising:

• a. a diluting medium comprising water or an aqueous solvent mixture, comprising water and at least one organic cosolvent;
• and
• b. a dilutable, non-aqueous concentrate comprising a homogeneous mixture comprising:
• i. at least one self-emulsifying fluorinated alkoxysilane of the formula I:
• Rf1—[—Q—[SiY3−xRx1]z]y (I)
• wherein Rf1 represents a monofunctional or difunctional perfluoropolyether comprising perfluorinated repeating units selected from the group consisting of —(CnF2n)—, —(CnF2nO)—, —(CF(Z))—, —(CF(Z)O)—, —(CF(Z)CnF2nO)—, —(CnF2nCF(Z)O)—, and combinations thereof, wherein Z is selected from the group consisting of a fluorine atom, a perfluoroalkyl group, an oxygen-substituted perfluoroalkyl group, a perfluoroalkoxy group, and an oxygen-substituted perfluoroalkoxy group, and wherein n is 1 to 6;
• Q independently represents an organic difunctional or trifunctional linking group;
• R1 independently represents a C1-C4 alkyl group;
• Y independently represents a C1-C4 alkoxy group or a hydrophilic alkoxy group of the structure —O—A—R3 with the proviso that at least one hydrophilic alkoxy group is present in the fluorinated alkoxysilane, wherein each A independently comprises a difunctional hydrophilic group:
• a) having the formula (CHR2—CH2O)q in which q is a number having a value of 1 to 40, R2 is independently hydrogen or methyl, and that at least 70% of R2 is hydrogen;
• or (b) derived from a polyol or its alkyl ether or polyether derivative by removal of one OH and one hydroxyl hydrogen;
• and wherein R3 independently is hydrogen or a lower alkyl group having 1 to 4 carbon atoms;
• x is 0 or 1;
• y is 1 or 2;
• z is 1 or 2;
• and
• ii. one or both of at least one organic cosolvent and at least one fluorinated surfactant.