Aldehyde functional siloxanes
View Patent ↗A process for preparing aldehyde functional organopolysiloxanes and the products prepared therefrom is disclosed. The process involves a hydrosilylation reaction between an aldehyde having a non -conjugated unsaturated group with a polyorganohydrogensiloxane.
1. A process for preparing an aldehyde functional organopolysiloxane comprising reacting;
A) a polyorganohydrogensiloxane, and
B) an aldehyde having a non-conjugated unsaturated group, via a hydrosilylation reaction.
2. The process of claim 1 wherein the polyorganohydrogensiloxane is selected from the group having an average formula of:
or a combination thereof, where m, p, and t >0, n and s ≧0, and R 1 is a hydrocarbon.
3. The process of claim 2 wherein R 1 is methyl.
4. The process of claim 1 wherein the aldehyde contains a terminal unsaturated hydrocarbon group.
5. The process of claim 4 wherein the terminal unsaturated hydrocarbon group is an allyl group.
6. The process of claim 1 wherein the aldehyde is 10-undecenal.
7. The product produced by the process according to claims 1 .
8. An organopolysiloxane comprising a siloxy unit of the formula R a 1 R 2 SiO (3-a)/2 wherein
R 1 is a monovalent hydrocarbon group,
R 2 is —(CH 2 ) 10 C(O)H or —(CH 2 ) 3 CH(CH 2 CH 3 )CHC(CH 2 CH 3 )C(O)H, and
a is zero to 2.
9. The organopolysiloxane of claim 8 wherein the organopolysiloxane has the average formula;
where m, p, and t>0, n and s≧0, R 1 is a hydrocarbon, and
R 2 is —(CH 2 ) 10 C(O)H or —(CH 2 ) 3 CH(CH 2 CH 3 )CHC(CH 2 CH 3 )C(O)H.