A method of preparing an acrylate-functional branched organosilicon compound (compound) is provided, and comprises reacting (A) a branched organosilicon compound and (B) an acrylate compound in the presence of (C) a catalyst, wherein component (A) has the general formula XSi(R.sup.1).sub.3, where X comprises a halogen-functional moiety and each R.sup.1 is selected from R and OSi(R.sup.4).sub.3, with the proviso that at least one R.sup.1 is OSi(R.sup.4).sub.3; each R.sup.4 is selected from R, OSi(R.sup.5).sub.3, and [OSiR.sub.2].sub.mOSiR.sub.3; each R.sup.5 is selected from R, OSi(R.sup.6).sub.3, and [OSiR.sub.2].sub.mOSiR.sub.3; each R.sup.6 is selected from R and [OSiR.sub.2].sub.mOSiR.sub.3; each R is an independently selected hydrocarbyl group; and 0m100; with the proviso that at least one of R.sup.4, R.sup.5 and R.sup.6 is [OSiR.sub.2].sub.mOSiR.sub.3. The compound prepared by the method, a copolymer comprising the reaction product of the compound and a second compound, a method of forming the copolymer, and a composition comprising the copolymer are each also provided.

An organosilicon compound with amino-functional groups is prepared. A catalyzed reductive amination process for combining an aldehyde-functional organosilicon compound with an amine source and hydrogen produces the amino-functional organosilicon compound.

An isocyanate group-containing organosilicon compound shown by the following general formula (1), and having three or more R.sup.2 groups per molecule and a viscosity at 25 C. of 100 mm.sup.2/s or less. This provides an organosilicon compound which has three or more isocyanate groups per molecule, and which is suitable as a crosslinking agent, low in viscosity, and excellent in handleability. R.sup.1.sub.aR.sup.2.sub.bSiO.sub.(4ab)/2 (1), where each R.sup.1 is identical to or different from one another, represents a monovalent alkyl group having 1 to 10 carbon atoms, a fluorine-substituted alkyl group, a monovalent aryl group having 6 to 10 carbon atoms, or a monovalent aralkyl group having 7 to 10 carbon atoms, and has no aliphatic unsaturated group; and R.sup.2 represents an organic group shown by a formula CH.sub.2CH.sub.2Si(CH.sub.3).sub.2OSi(CH.sub.3).sub.2CH.sub.2CH.sub.2CH.sub.2NCO.

A branched organosilicon compound (compound) having the general formula (R1).sub.3SiXNR.sup.2-D-Z(R.sup.7).sub.a is provided. In the formula: each R.sup.1 is selected from R and OSi(R.sup.4).sub.3, with the proviso that at least one R.sup.1 is OSi(R.sup.4).sub.3; where each R.sup.4 is selected from R, OSi(R.sup.5).sub.3, and [OSiR.sub.2].sub.mOSiR.sub.3; where each R.sup.5 is selected from R, OSi(R.sup.6).sub.3, and [OSiR.sub.2].sub.mOSiR.sub.3; where each R.sup.6 is selected from R and [OSiR.sub.2].sub.mOSiR.sub.3; with the proviso that at least one of R.sup.4, R.sup.5 and R.sup.6 is [OSiR.sub.2].sub.mOSiR.sub.3; where each R is independently a substituted or unsubstituted hydrocarbyl group; and where 0m100; each of X and D is an independently selected divalent linking group; each R.sup.2 and R.sup.7 is an independently selected substituted or unsubstituted hydrocarbyl group or H; Z is O or N; and subscript a is the valency of Z. Also provided is a method of preparing the compound and a composition including the compound.