Shaped organosiloxane polycondensates, process for their preparation and use

US5466767A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Stefan Wieland · Offenbach, DE
• Peter Panster · Rodenbach, DE
• Horst Grethe · Hanau, DE

Key dates

• Filing date: Nov 15, 1994
• Grant date: Nov 14, 1995
• Expiry date: Nov 15, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/58
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Disclosed are 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 m.sup.2 /g, a specific pore volume of 0.01 to 5 ml/g, and a bulk density of 50 to 1000 g/l, consisting of units of the formula (I): EQU X--R.sup.1 (I) and/or the formula (II): EQU R.sup.2 --Y--R.sup.3 (II) and the formula (III): ##STR1## as well as optionally, in addition, units of the formula ##STR2## wherein R.sup.1 to R.sup.3 are identical or different and represent a group of the formula (V): ##STR3## R.sup.4 being 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 formula ##STR4## and M corresponding to a Si, Ti or Zr atom. Also disclosed are a process for preparation and use.