Coating compositions and treating method

A coating composition system for treating cellulosic articles comprising:

• at least a first aqueous composition having a pH of at least 10 and comprising potassium silicate, wherein the potassium silicate is present in a range of from 1.5 to 32% by weight, the molar ratio of silicon (Si) to potassium (K) of said potassium silicate is 1.2-2.1, and
• at least a second aqueous composition comprising an emulsion of:
• an alkoxy silane compound of the general formula I:
• wherein
• R1 is selected from the group consisting of straight and branched, saturated and unsaturated alkyls and aryls, which group is optionally substituted with aromatic, halogen and/or heteroatom functionalities and organo-functional groups;
• R2 and R3 are independently a straight or branched alkoxy group;
• and
• R4 is a straight or branched alkoxy group or is selected from the group consisting of straight and branched, saturated and unsaturated alkyls and aryls, which group is optionally substituted with aromatic, halogen and/or heteroatom functionalities and organo-functional groups;
• and/or
• a siloxane compound of the general formula II:
• wherein
• R11, R12, R13, R14, R15 and R16, independently are selected from the group consisting of straight and branched, saturated and unsaturated alkyls and aryls, which group is optionally substituted with aromatic, halogen and/or heteroatom functionalities and organo-functional groups;
• R17 and R18 are functional groups independently selected from the group consisting of hydroxyl or amino;
• and
• n is 0-20;
• and/or
• a siloxane compound of the general formula III
• wherein
• R21, R22, R23, R24, R25, R26, R27 and R28 independently are selected from the group consisting of straight and branched, saturated and unsaturated alkyls and aryls, which group is optionally substituted with aromatic, halogen and/or heteroatom functionalities and organo-functional groups.