Compounding filled silicone compositions
AssigneeGeneral Electric Company
InventorsNorberto Silvi, Mark Howard Giammattei
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Abstract
High levels of silica, processing fluid and high molecular weight silicone polymer are compounded into a homogeneous silica filled composition without forming a preconcentrate of fumed silica and polymer. A fumed silica is fed into a unitary continuous compounding apparatus at a first location prior to addition of the silicone polymer. The fumed silica is then compounded with the silicone polymer, which is fed into the compounding apparatus at a location down-stream in the compounding apparatus from the first location. The compounding apparatus can be a co-rotating, intermeshing double screw extruder.
Claims65
A process for compounding a filled silicone composition, comprising:
- mixing a filler with a processing fluid at a first location of a unitary continuous compounding apparatus to form a mixture of filler and processing fluid prior to addition of a silicone polymer, and
- mixing said mixture of filler and processing fluid with said silicone polymer at a location downstream from said first location in said unitary continuous compounding apparatus, wherein said processing fluid is different than said silicone polymer.
A process for compounding a filled silicone composition, comprising:
- mixing a filler with a processing fluid at a first location of a unitary continuous compounding apparatus prior to addition of a silicone polymer, and
- mixing said filler with said silicone polymer at a location downstream from said first location in said unitary continuous compounding apparatus, wherein said unitary compounding apparatus is a co-rotating, intermeshing double screw extruder.
Dependencies are inferred from the claim text.