Branched polyglycols and branched polyether functional organopolysiloxanes and coatings containing same
View Patent ↗Branched polyglycols and branched polyether functional organopolysiloxanes are disclosed as is a process for making branched polyether functional organopolysiloxanes by reacting an organohydrogensiloxane and a branched polyglycol having an unsaturated group via a hydrosilylation reaction, as well as coating compositions containing branched polyether functional organopolysiloxanes and a binder are disclosed. Coatings resulting from these compositions were more hydrophilic and had improved dirt release properties as compared to coatings containing similar, but un-branched, polyether functional organopolysiloxanes.
1. A non-fluorinated branched polyether functional organopolysiloxane comprising a combination of quarternary siloxy units and at least one siloxy unit of the formula R i R 1 SiO [3-i]/2
wherein
R is a monovalent hydrocarbon group,
R 1 is a branched polyether group, having the formula A-[(B) n (C) x (D) y (E) z ], where:
A is CH 2 ═CH—CH 2 —O— attached to the polysiloxane via a hydrosilylation reaction,
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, and
i is zero to 2;
wherein the polymer structure of the branched polyether functional organopolysiloxane is either random or block wherein the organopolysiloxane has the average formula:
(R 2 R 1 SiO 0.5 )(SiO 2 ) w (R 2 R 1 SiO 0.5 ),
(R 2 R 1 SiO 0.5 )(SiO 2 ) w (R 2 SiO) x (R 2 R 1 SiO 0.5 ),
(R 3 SiO 0.5 )(R 2 SiO) x (R 1 RSiO) y (SiO 2 ) w (R 3 SiO 0.5 ),
where R is a monovalent hydrocarbon,
R 1 is a branched polyether group, and
w>0, X≧0 and y≧1.
2. 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 CH 2 ═CH—CH 2 —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:
(R 2 HSiO 0.5 )(SiO 2 ) w (R 2 HSiO 0.5 ),
(R 2 HSiO 0.5 )(SiO 2 ) w (R 2 SiO) x (R 2 HSiO 0.5 ),
(R 3 SiO 0.5 )(R 2 SiO) x (RHSiO) y (SiO 2 ) w (R 3 SiO 0.5 ),
where R is a monovalent hydrocarbon, and
w>0, x≧0, and y≧1.
3. A product prepared by the process of claim 2 .
4. 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 R i R 1 SiO [3-i]/2
wherein i is zero to 2
R is a monovalent hydrocarbon group,
R 1 is a branched polyether group, having the formula:
A-[(B) n (C) x (D) y (E) z ],
where,
A is CH 2 ═CH—CH 2 —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:
(R 2 R 1 SiO 0.5 )(SiO 2 ) w (R 2 R 1 SiO 0.5 ),
(R 2 R 1 SiO 0.5 )(SiO 2 ) w (R 2 SiO) x (R 2 R 1 SiO 0.5 ),
(R 3 SiO 0.5 )(R 2 SiO) x (R 1 RSiO) y (SiO 2 ) w (R 3 SiO 0.5 ),
where R is a monovalent hydrocarbon,
R 1 is a branched polyether group, and
w>0, x≧0, and y≧1.