Branched polysiloxanes and use of these
View Patent ↗Branched polysiloxanes of formula (I) M a1 M H a2 M Vi a3 D b1 D H b2 D Vi b3 T c1 T H c2 T Vi c3 Q d (I) wherein M=[R 2 R 1 2 SiO 1/2 ], M H =[R 1 2 HSiO 1/2 ], M Vi =[R 3 R 1 2 SiO 1/2 ], D=[R 1 2 SiO 2/2 ], D H =[R 1 HSiO 2/2 ], D Vi =[R 1 R 3 SiO 2/2 ], T=[R 4 SiO 3/2 ], T H =[HSiO 3/2 ], T Vi =[R 3 SiO 3/2 ], Q=[SiO 4/2 ], R 1 is mutually independently identical or different, linear or branched, saturated or unsaturated hydrocarbon moieties, R 2 is mutually independently the same as R 1 , an alkoxy moiety or a hydroxy group, R 3 is mutually independently identical or different, linear or branched, olefinically unsaturated hydrocarbon moieties, R 4 is mutually independently R 1 or identical or different linear, branched and/or cyclic, saturated or unsaturated hydrocarbon moieties comprising heteroatoms, a1=from 0 to 50, a2=from 1 to 50, a3=from 1 to 50, b1=from 10 to 5000, b2=from 0 to 30, b3=from 0 to 30, c1=from 0 to 50, c2=from 0 to 50 c3=from 0 to 50, d=from 0 to 50, with the proviso that the sum c1+c2+c3+d is greater than or equal to 1, are provided.
1. A polysiloxane of formula (I)
M a1 M H a2 M Vi a3 D b1 D H b2 D Vi b3 T c1 T H c2 T Vi c3 Q d (I)
wherein
M=[R 2 R 1 2 SiO 1/2 ],
M H =[R 1 2 HSiO 1/2 ],
M Vi =[R 3 R 1 2 SiO 1/2 ],
D=[R 1 2 SiO 2/2 ],
D H =[R 1 HSiO 2/2 ],
D Vi =[R 1 R 3 SiO 2/2 ],
T=[R 4 SiO 3/2 ],
T H =[HSiO 3/2 ],
T Vi =[R 3 SiO 3/2 ],
Q=[SiO 4/2 ],
R 1 is mutually independently identical or different, linear or branched, saturated or unsaturated hydrocarbon moieties,
R 2 is mutually independently the same as R 1 , an alkoxy moiety or a hydroxy group,
R 3 is mutually independently identical or different, linear or branched, olefinically unsaturated hydrocarbon moieties comprising terminal bonds,
R 4 is mutually independently R 1 or identical or different linear, branched and/or cyclic, saturated or unsaturated hydrocarbon moieties comprising heteroatoms,
a1=from 0 to 50,
a2=from 1 to 50,
a3=from 1 to 50,
b1=from 10 to 5000,
b2=from 0 to 30,
b3=from 0 to 30,
c1=from 0 to 50,
c2=from 0 to 50,
c3=from 0 to 50,
d=from 4 to 10.
2. A polysiloxane according to claim 1 , wherein c1=c2=c3=0.
3. A polysiloxane according to claim 1 , wherein a ratio of the sum of a2, b2 and c2 to the sum of a3, b3 and c3 is from 1:10 to 10:1.
4. A polysiloxane according to claim 1 , wherein b2=0, b3=0 and b1>c1+c2+c3+d.
5. A process for producing branched polysiloxanes having olefinically unsaturated groups and having SiH groups, comprising reacting
one or more silanes or siloxanes which have one or more SiH functions and which have no olefinically unsaturated hydrocarbon moieties,
one or more silanes or siloxanes which have one or more olefinically unsaturated hydrocarbon moieties, one or more Sill function-free siloxanes having no olefinically unsaturated hydrocarbon moieties,
one or more tetraalkoxysilanes, and/or
one or more trialkoxysilanes,
where all of the silanes used for each of said components have alkoxy groups, with addition of water and in the presence of at least one Brönstedt-acid catalyst, and wherein said branched polysiloxanes are of formula (I)
M a1 M H a2 M Vi a3 D b1 D H b2 D Vi b3 T c1 T H c2 T Vi c3 Q d (I)
wherein
M=[R 2 R 1 2 SiO 1/2 ],
M H =[R 1 2 HSiO 1/2 ],
M=[R 3 R 1 2 SiO 1/2 ],
D=[R 1 2 SiO 2/2 ],
D H =[R 1 HSiO 2/2 ],
D Vi =[R 1 R 3 SiO 2/2 ],
T=[R 4 SiO 3/2 ],
T H =[HSiO 3/2 ],
T Vi =[R 3 SiO 3/2 ],
Q=[SiO 4/2 ],
R 1 is mutually independently identical or different, linear or branched, saturated or unsaturated hydrocarbon moieties,
R 2 is mutually independently the same as R 1 , an alkoxy moiety or a hydroxy group,
R 3 is mutually independently identical or different, linear or branched, olefinically unsaturated hydrocarbon moieties comprising terminal bonds,
R 4 is mutually independently R 1 or identical or different linear, branched and/or cyclic, saturated or unsaturated hydrocarbon moieties comprising heteroatoms,
a1=from 0 to 50,
a2=from 1 to 50,
a3=from 1 to 50,
b1=from 10 to 5000,
b2=from 0 to 30,
b3=from 0 to 30,
c1=from 0 to 50,
c2=from 0 to 50,
c3=from 0 to 50,
d=from 4 to 10.
6. The process according to claim 5 , wherein said Brönstedt-acid catalyst comprises an acidic ion-exchanger resin which has sulphonic acid groups and which is solid at 25° C. and 1013 mbar.
7. A curable single-component silicone composition comprising at least a polysiloxane of formula (I)
M a1 M H a2 M Vi a3 D b1 D H b2 D Vi b3 T c1 T H c2 T Vi c3 Q d (I)
wherein
M=[R 2 R 1 2 SiO 1/2 ],
M H =[R 1 2 HSiO 1/2 ],
M Vi =[R 3 R 1 2 SiO 1/2 ],
D=[R 1 2 SiO 2/2 ],
D H =[R 1 HSiO 2/2 ],
D Vi =[R 1 R 3 SiO 2/2 ],
T=[R 4 SiO 3/2 ],
T H =[HSiO 3/2 ],
T Vi =[R 3 SiO 3/2 ],
Q=[SiO 4/2 ],
R 1 is mutually independently identical or different, linear or branched, saturated or unsaturated hydrocarbon moieties,
R 2 is mutually independently the same as R 1 , an alkoxy moiety or a hydroxy group,
R 3 is mutually independently identical or different, linear or branched, olefinically unsaturated hydrocarbon moieties comprising terminal bonds,
R 4 is mutually independently R 1 or identical or different linear, branched and/or cyclic, saturated or unsaturated hydrocarbon moieties comprising heteroatoms,
a1=from 0 to 50,
a2=from 1 to 50,
a3=from 1 to 50,
b1=from 10 to 5000,
b2=from 0 to 30,
b3=from 0 to 30,
c1=from 0 to 50,
c2=from 0 to 50,
c3=from 0 to 50,
d=from 4 to 10.
8. The silicone composition according to claim 7 , wherein c1=c2=c3=0.
9. The silicone composition according to claim 7 , wherein a ratio of the sum of a2, b2 and c2 to the sum of a3, b3 and c3 is from 1:10 to 10:1.
10. The silicone composition according to claim 7 , wherein b2=0, b3=0 and b1>c1+c2+c3+d.
11. The silicone composition according to claim 7 , further comprising additional constituents which adjust or affect chemical and/or physical properties.