Composition and process for reducing the drying time of solid substrates

A composition for reducing the drying time of solid substrates, comprising:

• a) One or more quaternary ammonium surfactant(s) according to the following general structure
• with the provision that R1 and R2 are C11-C21 linear or branched, saturated or unsaturated hydrocarbon groups, which may be the same or different and may be optionally substituted with one or more substituents selected from halogen, hydroxyl, amino, and C1-C4 alkoxy,
• R3 and R4 are C1-C3 linear or branched hydrocarbon groups, which may be the same or different, and
• X− is selected from Cl−, Br−, I−, sulfate, and methosulfate, and
• b) one or more dimethylpolysiloxane(s) having a weight average molecular weight Mw in a range of 190 g/mol to 6000 g/mol determined by gel permeation chromatography,
• wherein a total concentration of compounds according to a) is in a range of 0.1% to less than 5% by weight, calculated to the based on a total weight of the composition, and
• wherein a weight ratio of the compounds a) to b) is in a range of 0.075 to 8.