Polysiloxane filler treating agent and compositions prepared therewith

A composition comprising:

• a) a polyorganosiloxane;
• b) filler particles;
• and
• c) a filler treating agent of Formula I:
• where m is from 5 to 150;
• n is from 0.1 to 5;
• p is from 0 to 5;
• q is from 1 to 6;
• X is S or NR6;
• each R1 is independently C1-C6-alkyl, vinyl, phenyl, or benzyl;
• each R1′ is independently C1-C6-alkyl;
• R2 is:
• R2′ is:
• where R3 is H or methyl;
• each R4 is independently C1-C6-alkyl;
• a is an integer of 1 to 3;
• R5 is C1-C12-alkyl, R6 is H or C1-C6 alkyl, and the dashed line represents the point of attachment to X;
• wherein the polyorganosiloxane has degree of polymerization in the range of from 40 to 800.