Branched organosilicon compound, method of preparing same, and copolymer formed therewith

A branched organosilicon compound having the following general formula:

• where each R1 is selected from R and —OSi(R4)3, where each R4 is selected from R, —OSi(R5)3, and —[OSiR2]mOSiR3, where 0≤m≤100;
• where each R5 is selected from R, —OSi(R6)3, and —[OSiR2]mOSiR3, where m is defined above;
• where each R6 is selected from R and —[OSiR2]mOSiR3, where m is defined above;
• with the proviso that at least one of R4, R5 and R6 is —[OSiR2]mOSiR3, where m is defined above;
• X is a divalent linking group;
• and
• Y is selected from one of formulas (I)-(III):
• where each R is an independently selected substituted or unsubstituted hydrocarbyl group;
• each D1 is an independently selected divalent hydrocarbon group;
• each subscript a is independently 0 or 1;
• each subscript b is independently 0 or 1;
• each subscript e is independently 1 or 2;
• each subscript f is independently 0 or 1, with the proviso that when f is 1, b is 1;
• subscript t is ≥0;
• subscript u is >0;
• 0≤n≤10;
• and R3 comprises a halogen atom, an acryloxy functional moiety, an alkoxysilyl functional moiety, or an epoxy functional moiety;
• and
• wherein at least one of the following provisos is true:
• a) two R1 are OSi(R4)3;
• or
• b) at least two R4 are —OSi(R5)3 or —[OSiR2]mOSiR3;
• or
• c) at least two R5 are —OSi(R6)3 or —[OSiR2]mOSiR3;
• or
• d) at least two R6 are —[OSiR2]mOSiR3.