Marking composition

Claim 1

A SPRAYABLE COMPOSITION ADAPTED FOR USE AS A MARKING MATERIAL AND COMPRISING WATER HAVING DISPERSED THERIN FINELY DIVIDED RUTILE TITANIUM DIOXIDE PARTICLES HAVING BONDED TO THE SURFACE THEREOF AT LEAST A MONOLAYER OF UNSATURATED ALIPHATIC POLYSILOXANE GROUPS IN AMOUNT SUFFICIENT TO RENDER SAID TITANIUM DIOXIDE PARTICLES HYDROPHOBIC, SAID POLYSILOXANE BEING THE HYDROLYSIS PRODUCT OF A SILANE CONTAINING A RADICAL OF THE GROUP CONSISTING OF VINYL AND ACRYLYL, AND, UNIFORMLY COATED ON THE OUTER SURFACE OF SAID TITANIUM DIOXIDE PARTICLES CONTAINING SILOXANE GROUPS, FROM ABOUT 1% TO 4%, BASED ON THE WEIGHT OF SAID PARTICLES, OF A POLYETHOXYLATED QUATERNARY AMMONMIUM SALT OF THE GENERAL FORMULA: H-(O-CH2-CH2)X-N(+)(-R)(-R1)-(CH2-CH2-O)Y-H Y(-) WHEREIN R IS AN ALIPHATIC GROUP CONTAINING FROM 8 TO 20 CARBON ATOMS, R1 IS AN ALKYL GROUP HAVING FROM 1 TO 2 CARBON ATOMS, X AND Y ARE INTEGERS EACH HAVING A VALUE OF AT LEAST 1 AND TOTALING BETWEEN 2 TO 50, INCLUSIVE, AND Y IS A MONOVALENT ANION.