Quartz-containing silicone compositions which are low in cyclic compounds
AssigneeWacker Chemie AG
InventorAndreas Koellnberger
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Abstract
Generation of cyclic siloxanes in silicone compositions containing quartz flour as a filer is reduced by incorporating a basic substance into the composition prior to adding filler.
Claims7
A method for the production of a storage stable, quartz filler-containing, moisture-curable condensation-crosslinkable or peroxide-induced crosslinkable silicone composition containing at least one silicone component in which cyclic siloxane generation is to be reduced, comprising reducing cyclic siloxane generation by compounding 0.1-5 wt. % of a basic-reacting additive into at least a part of the silicone component, and then incorporating a quartz flour filler therein, wherein the wt. % of basic-reacting additive is based on the weight of the non-quartz ingredients of the at least one silicon component, the basic-reacting additive is selected from the group consisting of solid, particulate inorganic compounds which, measured as a saturated solution in deionized water, exhibit a pH of from 9-14, and wherein the composition, when cured, forms a solid non-foam elastomer.
Dependencies are inferred from the claim text.