Fluorochemical composition comprising a fluorochemical oligomeric silane for rendering substrates oil and water repellent

Fluorochemical oligomer corresponding to the formula:

• X-MfnMhmMar-G
• wherein X represents the residue of an initiator or hydrogen;
• Mf represents units derived from fluorinated monomers having the formula:
• C4F9-Q2-E1
• wherein E1 represents a free radical polymerizable group and Q2 represents an organic divalent linking group;
• Mh represents units derived from non-fluorinated monomers;
• Ma represents units having a silyl group represented by the formula:
• 25
• wherein each of Y4, Y5 and Y6 independently represents an alkyl group, an aryl group or a hydrolyzable group, with the proviso that at least one of Y4, Y5 and Y6 represents a hydrolyzable group;
• G represents a monovalent organic group comprising the residue of a chain transfer agent;
• n represents an integer of 1 to 100;
• m represents an integer of 0 to 100;
• r represents an integer of 0 to 100;
• and n+m+r is at least 2;
• with the proviso that at least one of the following conditions is fulfilled:
• (a) G is a monovalent organic group that contains a silyl group of the formula:
• 26
• wherein Y1, Y2 and Y3 each independently represents an alkyl group, an aryl group or a hydrolyzable group with at least one of Y1, Y2 and Y3 representing a hydrolyzable group;
• or (b) r is at least 1 and at least one of Y4, Y5 and Y6 represents a hydrolyzable group.

Fluorochemical oligomer having the formula:

• X-MfnMhmMar-G
• wherein X represents the residue of an initiator or hydrogen;
• Mf represents units derived from fluorinated monomers;
• Mh represents units derived from non-fluorinated monomers;
• Ma represents units having the formula:
• 27
• wherein R1, R2 and R3 each independently represents hydrogen, an alkyl group, an aryl group or halogen, Q3 represents an organic divalent linking group, T represents O or NR with R being hydrogen, an aryl or a C1-C4 alkyl group, and wherein each of Y4, Y5 and Y6 independently represents an alkyl group, an aryl group or a hydrolyzable group, with the proviso that at least one of Y4, Y5 and Y6 represents a hydrolyzable group;
• G represents a monovalent organic group comprising the residue of a chain transfer agent;
• n represents an integer of 1 to 100;
• m represents an integer of 0 to 100;
• r represents an integer of 1 to 100;
• and n+m+r is at least 2.

Fluorochemical oligomer having the formula:

• X-MfnMhmMar-G
• wherein X represents the residue of an initiator or hydrogen;
• Mf represents units derived from fluorinated monomers;
• Mh represents units derived from a non-fluorinated monomers;
• Ma represents units having a silyl group represented by the formula:
• 29
• wherein each of Y4, Y5 and Y6 independently represents an alkyl group, an aryl group or a hydrolyzable group, with the proviso that at least one of Y4, Y5 and Y6 represents a hydrolyzable group;
• G corresponds to the formula:
• 30
• wherein Q1 and Q5 each independently represents an organic divalent linking group, T2 represents O or NR with R being hydrogen, an aryl or a C1-C4 alkyl group, and Y1, Y2 and Y3 each independently represents an alkyl group, an aryl group or a hydrolyzable group with at least one of Y1, Y2 and Y3 representing a hydrolyzable group;
• n represents an integer of 1 to 100;
• m represents an integer of 0 to 100;
• r represents an integer of 0 to 100;
• and n+m+r is at least 2.