Polycondensation of organic silicon compounds
AssigneeBASF SE
InventorThomas Friedrich
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Abstract
A process is described for the polycondensation of organic silicon compounds at from pH 6 to 8 in the presence of a lipase which is, where appropriate, immobilized on a carrier composed of polymer materials. Suitable organic silicon compounds capable of polycondensation are (RO)(R1O)(R2O)(R3O)Si, (RO)(R1O)(R2O)SiR3, (RO)(R1O)Si (R2)(R3) and (RO) SiR1R2R3, where R, R1, R2 and R3 are independently of one another C1- to C10-alkyl, C3- to C10-cycloalkyl, C4- to C20-alkylcycloalkyl, aryl, C6- to C16-alkylaryl, the alkyl groups being linear or branched. It is advantageous and possible to obtain the lipase on a large scale relatively simply by fermentation processes. Preference is given to employing lipases from Pseudomonas species.
Claims20
A process, comprising:
- polycondensing organic silicon compounds in a solution at a pH 6 to 8 in the presence of lipase enzyme as the sole polycondensation catalyst, thereby forming polycondensed organosilicon product.
A process for the polycondensation of organic silicon compounds in solution at a pH of 6 to 8 in the presence of an enzyme, wherein the enzyme is a lipase immobilized on a carrier and wherein the carrier material comprises at least one polymer selected from the group consisting of polypropylene, polystyrene and polyurethane foam.
A process, comprising:
- polycondensing an organic silicon compound in solution at a pH of 6 to 8 in the presence of a lipase enzyme which catalyzes the polycondensation of said organic silicon compound to oligosilicone, oligosilicate, polysilicone or polysilicate product.
Dependencies are inferred from the claim text.