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US 4,300,841 AGranted
Processing of silicone polymers
AssigneeTredair Industries, Inc.
InventorJames F. Richards
Life of this patent
Estimating the term…
Abstract
A method of mixing silicone rubber polymers with fillers and/or other additives without employing a kneading type action wherein the ingredients to be mixed are impacted with a high speed mixing blade for a first period of time in which the blade is operated at a tip speed of about 150 feet per second, until the ingredients are reduced to relatively small uniform particles and then operating the mixer blades at a speed of about 300 feet per second until sufficient viscosity of the material is reached.
Claims5
The method of compounding silicone polymers with fillers comprising:
- introducing the filler and random pieces of unreinforced silicone polymers into a mixing chamber;
- impacting the filler and silicone polymer with a high speed mixer blade at a first speed until the silicone polymer is reduced to relatively small and uniform particles;
- subsequently operating the mixer blade at a higher speed in the order of twice the lower speed to drive the filler into the silicone polymer without kneading of the material.
Dependencies are inferred from the claim text.