Shaped organosiloxane polycondensates, processes for their...

C - Chemistry – Metallurgy – 08 – G

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C08G 77/22 (2006.01) B01J 20/26 (2006.01) B01J 32/00 (2006.01) C08G 77/42 (2006.01) C08G 77/48 (2006.01) C08G 77/54 (2006.01) C08G 77/58 (2006.01)

Patent

CA 2103653

The invention relates to shaped organosiloxane polycondensates in the form of macroscopic spherical particles with a diameter of 0.01 to 2.5 mm, a specific surface area of 0.01 to 1000 m2/g , a specific pore volume of 0.01 to 5.0 ml/g and a bulk density of 50 to 1000 g/l, consisting of units of the formula X - R1 (I) and/or the formula R2 - Y - R3 (II) and the formula (see fig. I) or (see fig. II) as well as optionally in addition of units of the formula (see fig. III) or (see fig. IV) or (see fig. V) wherein R1 to R3 are identical or different and represent a group of the general formula (see fig. VI) R4being bonded directly to the X or Y group and representing a linear or branched, fully saturated or unsaturated alkylene group, a cycloalkylene group, a phenylene group or a unit of the general formula Image or Image and M corresponding to a Si, Ti or Zr atom. Also described are a process for preparation and use.

Le présent brevet porte sur des polycondensats organosiloxaniques préformés sous forme de particules sphériques macroscopiques ayant un diamètre compris entre 0,01 et 2,5 mm, une surface spécifique variant de 0,01 à 1 000 m2/g, un volume des pores spécifique de 0,01 à 5,0 mL/g et une masse volumique apparente de 50 à 1 000 g/L, comprenant des unités de formule X - R1 (I) et/ou de formule R2 - Y - R3 (II) et de formule (voir figure I) ou (voir figure II) ainsi que des unités facultatives en plus des unités de la formule (voir figure III) ou (voir figure IV) ou (voir figure V) dans laquelle R1 à R3 sont identiques ou différents et représentent un groupe de formule générale R4 (voir figure VI) liés directement au groupe X ou Y et représentant un groupe alcalin linéaire ou ramifié, entièrement saturé ou insaturé, un groupe cycloalkylène, un groupe phénylène ou une unité de formule générale IMG ou IMG et M correspondant à un atome de Si, Ti ou Zr. Il comporte aussi la description du procédé d'obtention et des utilisations.

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