Branched polyglycols and branched polyether functional organopolysiloxanes and coatings containing same

A process for preparing a branched polyether functional organopolysiloxane comprising reacting;

• i) an organohydrogenpolysiloxane comprising a combination of guarternary siloxy groups and at least one mono-, di-, or tri-siloxy group containing Si—H, and
• ii) a branched polyglycol having an unsaturated group, via a hydrosilylation reaction;
• wherein the branched polyglycol having an unsaturated group has the formula:
• A-[(B)n(C)x(D)y(E)z],
• where,
• A is CH2═CH—CH2—O—,
• B is a branching agent derived from glycidol with n from 1 to 20,
• C, D, and E are each an ethylene oxide group, and x, y, and z are independently from 0 to 50 with the proviso that at least one of x, y or z is 1 to 50,
• wherein the polymer structure is either random or block wherein the organopolysiloxane has the average formula:
• (R2HSiO0.5)(SiO2)w(R2HSiO0.5),
• (R2HSiO0.5)(SiO2)w(R2SiO)x(R2HSiO0.5),
• (R3SiO0.5)(R2SiO)x(RHSiO)y(SiO2)w(R3SiO0.5),
• where R is a monovalent hydrocarbon, and
• w>0, x≧0, and y≧1.

A coating composition comprising:

• a) a non-fluorinated branched polyether functional organopolysiloxane comprising a combination of quarternary siloxy units and at least one siloxy unit of the formula RiR1SiO[3-i]/2
• wherein i is zero to 2
• R is a monovalent hydrocarbon group,
• R1 is a branched polyether group, having the formula:
• A-[(B)n(C)x(D)y(E)z],
• where,
• A is CH2═CH—CH2—O— attached to the polysiloxane via a hydrosilylation reaction,
• B is a branching agent derived from glycidol with n from 1 to 20, and
• C, D, and E are each an ethylene oxide group, and x, y, and z are independently from 0 to 50 with the proviso that at least one of x, y or z is 1 to 50;
• wherein the polymer structure is either random or block;
• and
• b) a binder wherein the organopolysiloxane has the average formula:
• (R2R1SiO0.5)(SiO2)w(R2R1SiO0.5),
• (R2R1SiO0.5)(SiO2)w(R2SiO)x(R2R1SiO0.5),
• (R3SiO0.5)(R2SiO)x(R1RSiO)y(SiO2)w(R3SiO0.5),
• where R is a monovalent hydrocarbon,
• R1 is a branched polyether group, and
• w>0, x≧0, and y≧1.