C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 77/06 (2006.01) C08G 77/04 (2006.01) C08G 77/20 (2006.01)
Patent
CA 2081129
The present invention is a method for the preparation of a branched organopolysiloxane in which a polysiloxane with the formula SiO2 constitutes the branching center or branch origin and the terminal on only one side of the diorganopolysiloxane is bonded to the branch origin wherein this bonding is exactly to the branch origin. Specifically, the method for preparation of the branched polyorganosiloxane comprises the reaction of an alkali metal compound with a silanol-containing polysiloxane described by formula {SiO4/2}x{R1 2(OH)SiO1/2}y{R1 3SiO1/2}z{RO1/2}u, wherein each R1 is independently selected from a group consisting of C1-8 alkyls; haloalkyls, alkenyls, and aryls; R is selected from a group consisting of hydrogen atoms and C1-8 alkyls; 2 ~ x ~ 500; 2 ~ y + z + u~150; 2 ~ y; 0 ~ z; 0 ~ u ~ 15; 0.3 ~ (y + z + u)/x ~ 3; and 0 ~ u/(x + y + z) 0.1; by subsequent reaction with a cyclic organopolysiloxane described by formula {SiR2R3O}m, where R2 and R3 are defined as for R1 and 3 ~ m ~ 8; and finally by endcapping with triorganomonohalosilane or protic acid.
L'invention est une méthode pour la préparation d'un organopolysiloxane ramifié, où un polysiloxane de formule SiO2 constitue le centre ou l'origine de ramification, et où le groupe terminal sur l'un seulement des côtés du diorganopolysiloxane est lié à l'origine de ramification, la liaison se situant exactement au niveau de l'origine. La méthode de préparation du polyorganosiloxane ramifié comprend spécifiquement la réaction d'un composé de métal alcalin avec un polysiloxane renfermant le groupe silanol et décrit par la formule {SiO4/2}x{R1 2(OH)SiO1/2}y{R1 3SiO1/2}z{RO1/2}u, où chaque R1 est indépendamment un alkyle C1-8, un haloalkyle, un alcényle ou un aryle; R est un atome d'hydrogène ou un alkyle C1-8; 2 ~ x ~ 500; 2 ~ y + z + u~150; 2 ~ y; 0 ~ z; 0 ~ u ~ 15; 0.3 ~ (y + z + u)/x ~ 3; and 0 ~ u/(x + y + z) 0.1; il y a ensuite réaction avec un organopolysiloxane cyclique, décrit par la formule {SiR2R3O}m, où R2 et R3 correspondent à la définition donnée pour R1 et 3 ~ m ~ 8; enfin, il y a blocage aux extrémités avec le triorganomonohalosilane ou un acide protique.
Ogawa Takuya
Suzuki Toshio
Dow Corning Japan Limited
Gowling Lafleur Henderson Llp
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