Abstract: A polymeric liquid material formed of molecular building blocks of core-shell type architecture, wherein each building block consists of a hyperbranched polysiloxane core and a functional siloxane shell peripherally attached thereto, the material comprising bridging oxygen moieties (Si—O—Si), hydrolysable alkoxy moieties (Si—O—R) and organofunctional moieties (R?—Si—) and (R1—S1-R2) and less than 0.5 mass percent hydroxy moieties (Si—OH). The core has a degree of polymerization DPcore in the range of 1.3 to 2.7, the shell is formed of R?-substituted siloxane moieties and has a degree of polymerization DPshell in the range of 0.3 to 2.5. At least 75 atomic percent of all Si atoms in the core are bonded exclusively to alkoxy or bridging oxygens, the remainder each being bonded to 3 oxygens and 1 carbon. The total Si to free hydrolysable alkoxy molar ratio in the material is 1:1.25 to 1:2.75, and the material has a viscosity in the range of 10-100,000 cP.

Abstract: A new class of liquid polysiloxane materials obtainable from cost-effective commodity precursors allow tailoring a plurality of (multi)—functional properties. The materials are classified in terms of their chemical identity, which comprises Q-type nonorganofunctional, T-type monoorganofunctional and optional D-type diorganofunctional moieties. The T-type organofunctional species within a polymeric MBB can be present in various preferred combinations defined by spatial, stereochemical and compositional factors. The corresponding method of production for the liquid polymeric polysiloxanes involves a scalable, non-hydrolytic acetic anhydride method either in a simple one-step format to create statistically distributed “core-only” hyperbranched poly-alkoxysiloxanes or as a two— or multistep process to create “core-shell” materials.

Abstract: A polymeric liquid material formed of molecular building blocks of core-shell type architecture, wherein each building block consists of a hyperbranched polysiloxane core and a functional siloxane shell peripherally attached thereto, the material comprising bridging oxygen moieties (Si—O—Si), hydrolysable alkoxy moieties (Si—O—R) and organofunctional moieties (R?—Si—) and (R1-S1-R2) and less than 0.5 mass percent hydroxy moieties (Si—OH). The core has a degree of polymerization DPcore in the range of 1.3 to 2.7, the shell is formed of R?-substituted siloxane moieties and has a degree of polymerization DPshell in the range of 0.3 to 2.5. At least 75 atomic percent of all Si atoms in the core are bonded exclusively to alkoxy or bridging oxygens, the remainder each being bonded to 3 oxygens and 1 carbon. The total Si to free hydrolysable alkoxy molar ratio in the material is 1:1.25 to 1:2.75, and the material has a viscosity in the range of 10-100,000 cP.

Abstract: The present invention relates to a process for producing an aerogel material based on amorphous silica, comprising the following steps: a) preparing a mixture comprising silica sol, alcohol, and a hydrophobizing agent activatable by acid catalysis; b1) adding a base to the mixture formed in step a) and mixing the resulting mixture; b2) gelation of the mixture comprising silica sol obtained in step b2), resulting in the formation of a silica gel, and optional aging of the gel; c) adding a hydrophobization catalyst to the silica gel formed in step b2) and optionally aged, in-situ formation or controlled release of a hydrophobization catalyst, and initiation of the catalyzed hydrophobization of the silica; d) removing the volatile constituents of the mixture formed in step c) by subcritical drying, resulting in the formation of the aerogel material, wherein at least steps b2) to d) are carried out in the same reactor.