SILICONE RESIN-LINEAR COPOLYMER AND RELATED METHODS

1 . A silicone resin-linear copolymer comprising:

a resinous structure having the general formula (1)

(R 1 R 2 R 3 SiO 1/2 ) x (R 4 SiO 3/2 ) y   (1)

wherein each R 1 , R 2 , R 3 and R 4 is an independently selected substituted or unsubstituted hydrocarbyl group, with the proviso that in one molecular at least two of R 1 , R 2 , and R 3 are aryl groups; and x and y are each from >0 to <1 such that x+y=1; and

a linear structure having the general formula (2)

(R 5 R 6 SiO 2/2 )   (2)

wherein R 5 and R 6 are each independently selected substituted or unsubstituted hydrocarbyl groups;

wherein the resinous structure and the linear structure are bonded together in the silicone resin-linear copolymer via a siloxane bond.

2 . The silicone resin-linear copolymer of claim 1 , wherein the resinous structure has the formula (Ph 2 MeSiO 1/2 ) x (MeSiO 3/2 ) y , where x and y are defined above, Ph designates a phenyl group, and Me designates a methyl group.

3 . The silicone resin-linear copolymer of claim 1 , wherein the siloxane bond between the resinous structure and the linear structure involves a silicon atom of the (R 4 SiO 3/2 ) unit and a silicon atom of the linear structure.

4 . The silicone resin-linear copolymer of claim 1 , wherein the siloxane bond between the resinous structure and the linear structure is derived from an acetoxysilyl group.

5 . The silicone resin-linear copolymer of claim 1 , wherein the siloxane bond between the resinous structure and the linear structure is derived from dehydrogenation with a Lewis acid catalyst.

6 . A composition comprising:

(A) the silicone resin-linear co-polymer of claim 1 ; and

(B) a carrier fluid.

7 . The composition of claim 6 , wherein the (B) carrier fluid comprises (B1) a volatile fluid at 25° C.

8 . The composition of claim 6 , further defined as a cosmetic composition.

9 . A film-forming agent comprising the silicone resin-linear co-polymer of claim 1 .

10 . An adhesion promotor comprising the silicone resin-linear co-polymer of claim 1 .

11 . An encapsulant comprising the silicone resin-linear co-polymer of claim 1 .

12 . An electric device including a film formed from the silicone resin-linear co-polymer of claim 1 .

13 . A method of preparing a conformal coating on an electronic device, said method comprising:

applying a composition on the electronic device; and

forming the conformal coating on the electronic device;

wherein the composition is the composition of claim 6 .

14 . A method of preparing a silicone resin-linear copolymer, said method comprising:

reacting a linear organopolysiloxane having at least one silicon-bonded hydroxyl group and an acetoxysilane to give an acetoxysilylated organopolysiloxane; and

reacting the acetoxysilylated organopolysiloxane with a silicone resin having at least one silicon-bonded hydroxyl group to give the silicone resin-linear copolymer;

wherein the silicone resin-linear copolymer is that of claim 1 .

15 . A method of preparing a silicone resin-linear copolymer, said method comprising:

reacting a linear organopolysiloxane having at least one silicon-bonded hydrogen atom, hydroxyl group, or alkoxy group and a silicone resin having at least one silicon-bonded hydrogen atom, hydroxyl group, or alkoxy group in the presence of a Lewis acid catalyst;

with the proviso that when the linear organopolysiloxane includes the silicon-bonded hydrogen atom, the silicone resin includes a silicon-bonded hydroxyl group or alkoxy group, and when the linear organopolysiloxane includes the silicon-bonded hydroxyl group or alkoxy group, the silicone resin includes the silicon-bonded hydrogen atom;

wherein the silicone resin-linear copolymer is that of claim 1 .