Method of making a sealing composition

摘要

A process is claimed for the production of moisture-cured, heat-cured or addition-cured (2-component) sealing materials (I) based on silicone polymer, crosslinker and accelerator, together with filler and plasticiser as required. The process comprises (a) combining (a1) a mixture of 5-100 parts weight of paraffin oils with molecular weights of more than 180 with (a2) 100 parts weight alkylaromatic compound(s) and heating for 2-3 hours in a reactor at 5-10 bar and 280-300[deg]C, and (b) mixing the resulting product as plasticiser with the other components of (I) as above.