Branched organosilicon compound, method of preparing same, and related compositions

A branched organosilicon compound having the following general formula:

• where each R1 is selected from R and —OSi(R4)3, with the proviso that at least one R1 is —OSi(R4)3;
• where each R4 is selected from R, —OSi(R5)3, and —[OSiR2]mOSiR3;
• where each R5 is selected from R, —OSi(R6)3, and —[OSiR2]mOSiR3;
• where each R6 is selected from R and —[OSiR2]mOSiR3;
• with the proviso that at least one of R4, R5 and R6 is —[OSiR2]mOSiR3;
• where each R is independently an unsubstituted hydrocarbyl group or a halogen-substituted hydrocarbyl group;
• and where 0≤m≤100;
• where X is a divalent linking group;
• where D is a divalent hydrocarbon group having from 2 to 18 carbon atoms;
• where each R2 is independently selected from substituted or unsubstituted hydrocarbyl groups and H;
• Z is O or N;
• where R7 is independently selected from substituted or unsubstituted hydrocarbyl groups and H in each moiety indicated by subscript a;
• and
• where subscript a is the valency of Z, subject to one of the following provisos:
• (i) wherein each R1 is —OSi(R4)3, and wherein at least one of R4 is —[OSiR2]mOSiR3, or
• (ii) wherein the branched organosilicon compound has the following general formula:
• where each R5, each R6, and each R is independently selected and defined above;
• X is defined above, D is defined above, R2 is defined above, Z is defined above, R7 is defined above;
• and subscript a is defined above.