Method of preparing alkyl functionalized polysiloxane

A method of preparing alkyl functionalized polysiloxane, comprising:

• I) in a first step, reacting a silane oligomer (A) with a hydroxyl-terminated polysiloxane (B) in the presence of a catalyst 1, wherein the silane oligomer (A) comprises cyclic oligomer(s) (A1) of Formula I:
• where R1 is independently at each occurrence C6-C18 alkyl,
• R2 is independently at each occurrence C1-C5 alkyl,
• m is a number between 3 and 20,
• wherein the silane oligomer (A) comprises more than 30 wt % of cyclic trimer and tetramer of Formula I, based on the total weight of the silane oligomer (A),
• the hydroxyl-terminated polysiloxane (B) is of Formula IV:
• where Ra is independently at each occurrence C1-C5 alkyl or phenyl, and
• p is a number between 3 and 150, and
• II) in a second step following the first step, reacting the product of step (I) with an endcapper in the presence of a catalyst 2 to give the alkyl functionalized polysiloxane, wherein catalyst 1 and catalyst 2 may be the same or different, and wherein step I is conducted in an inert atmosphere at a reduced pressure, wherein the reduced pressure is a pressure below 100 mbar.

A method of preparing alkyl functionalized polysiloxane, comprising:

• I) in a first step, reacting a silane oligomer (A) with a hydroxyl-terminated polysiloxane (B) in the presence of a catalyst 1, wherein the silane oligomer (A) comprises cyclic oligomer(s) (A1) of Formula I:
• where R1 is independently at each occurrence C6-C18 alkyl,
• R2 is independently at each occurrence C1-C5 alkyl,
• m is a number between 3 and 20,
• wherein the silane oligomer (A) comprises more than 30 wt % of cyclic trimer and tetramer of Formula I, based on the total weight of the silane oligomer (A),
• the hydroxyl-terminated polysiloxane (B) is of Formula IV:
• where Ra is independently at each occurrence C1-C5 alkyl or phenyl, and
• p is a number between 3 and 150, and
• II) in a second step following the first step, reacting the product of step (I) with an endcapper in the presence of a catalyst 2 to give the alkyl functionalized polysiloxane, wherein catalyst 1 and catalyst 2 may be the same or different, and wherein step I is conducted in an inert atmosphere at a reduced pressure, wherein each R1 independently is selected from the group consisting of decyl, dodecyl, tetradecyl, hexadecyl, and mixtures thereof.