Patent ID: 8658254

Claim:
A method of coating paper substrates comprising the steps of: (i) mixing components to form a reactive water-free silicone-based composition, (ii) mixing said reactive water-free silicone-based composition with water to form the aqueous emulsion of said reactive silicone-based composition, (iii) coating the paper substrate with said aqueous emulsion of said reactive silicone-based composition, and (iv) curing said reactive silicone-based composition on said paper substrate to form said silicone-coated paper substrate wherein the residence time in mixing step (i) is less than the bath-life time of reactive silicone-based composition, and step (ii) requires that the reactive silicone-based composition obtained in step (i) is fed into an emulsification unit for carrying out step (ii) before the end of the bath-life time of the reactive silicone-based composition wherein step (i) comprises mixing: (a) one or more polyorganosiloxanes having in average at least two alkenyl groups, with a viscosity of 40 to 400,000 mPa·s at 25° C. at a shear rate of D=1 s −1 and a concentration of the alkenyl groups of 0.15 to 3.9 mol.-%, (b) one or more polyorganosiloxanes having in average at least two SiH groups, whereby the molar ratio of the SiH- to the Si-alkenyl-groups is between 0.7 and 10, (c) one or more hydrosilylation catalysts, (d) optionally one or more inhibitors of the hydrosilylation reaction, and (e) optionally one or more auxiliary agents.