Silane Modified Polymers With Improved Properties

A moisture curable composition comprising a physical blend of:

• a moisture curable, silane modified polymer of structure (I)
• B(-An-R—SiXYZ)I (I).
• wherein B is an organic backbone and B will not be a siloxane backbone,
• A is a divalent linking group linking the polymer backbone to the R1 group,
• I is an integer from 1 to 6,
• n is 0 or 1,
• R is a divalent C1-C12 hydrocarbon group that optionally comprises a heteroatom,
• at least one of X, Y and Z is a hydrolysable group;
• a moisture curable, silane functional additive that is the reaction product of a mixture comprising an isocyanotosilane and a polyol selected from a polyol having a linear ethylene oxide backbone and a functionality of 2 to 4, a polyol comprising at least one nitrogen atom in the backbone and a functionality equal or greater than 2 and combinations thereof, wherein the polyol is free of groups pendant from the backbone and propylene oxide;
• and
• a crosslinker;
• wherein cured reaction products of the moisture curable composition have greater strength and greater elongation compared to the moisture curable composition without the moisture curable, silane functional additive.