Patent ID: 8586690
Filing Date: 2013-11-19
Classification: C07F,C08G

Abstract:
1. A siloxane monomer mixture obtainable by way of a process comprising the steps of a) ring opening polymerization of a cyclic monomer of the structure each R is the same or different and is selected from H, OH, a hydrocarbon group having from 1 to 18 carbon atoms, a substituted hydrocarbon group having from 1 to 18 carbon atoms or a hydrocarbonoxy group having up to 18 carbon atoms and n is an integer between 1 and 6, in the presence of an acidic or basic ring opening polymerisation catalyst to form a mixture of siloxane monomers and linear oligomers, the linear oligomers comprising macrosiloxanes having a molecular weight ranging from 20,000 to 45,000 g/mol; b) removing the linear oligomers prepared in step (a) optionally using a suitable solvent; and c) removing the solvent, when present.