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US 2003/0119156 A1Published application
Biosynthesis of cyclic siloxanes
OwnerNabil Yaqub Sakkabinventor
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Abstract
Processes for making siloxanes, more particularly biosynthetic processes for making cyclic siloxanes are provided by the present invention.
Claims29
A process for producing a polymeric silicone of defined length comprised of:
- a. a organosilane monomer;
- b. a condensation catalyst for said monomer;
- c. a porous substrate wherein the pore size is designed to fit only the polymeric silicones of the desired length and shorter;
- d. a reacting solvent system that solubilizes the desired organosilane monomer, and all polymeric silicones of a size smaller than the target polymeric silicone such that the target polymeric silicone and any larger species are insoluble in said reacting solvent;
- e. a process for recovering the target polymeric silicone.
2 more elements
A process for producing a polymeric silicone of defined length comprised of:
- a. the alpha subunit of the protein filament derived from the silica spicules of Tethya aurantia with a molecular weight of about 29 kDa;
- b. a porous Sodium/Aluminum Zeolite wherein the pore size is designed to fit only the polymeric silicones of the desired length and shorter;
- c. a silicone-based solvent system that solubilizes organosilane monomers, and all polymeric silicones of a size smaller than the target polysiloxane such that the target polymeric silicone and any larger species are insoluble in said silicone solvent;
- d. a process for recovering the target polymeric silicone.
1 more element
A process for making a siloxane, the process comprising the steps of
- a) providing a silane of the formula:
- RaSi-Lb
- wherein R is a hydrocarbon group;
- L is a leaving group;
- the sum of a and b is 4;
- b) reacting the silane with a condensation catalyst such that the leaving group is displaced from the silane and at least one —Si—O—Si— bond is formed in the product of the reaction;
- and
- c) optionally, recovering the product of the reaction from step b);
- d) optionally, cyclizing the product of the reaction from step b) to produce a cyclic siloxane.
6 more elements
Dependencies are inferred from the claim text.