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US 5,770,141 AGranted
Process for the production of a filled reaction mixture
AssigneeBayer Aktiengesellschaft
InventorsKlaus Schulte, Heinrich Ersfeld, Karl Dieter Kreuer, Christian Wolfrum
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Abstract
A process is described for the production of a curable multi-component reaction mixture (and, in particular, a polyurethane), containing filler in which the reaction components are premixed and then mixed with the dry filler in a friction mixer having a conically shaped screw rotatable in a conical mixing chamber. The friction mixer is preferably operated under a fractional load at a low rotational speed.
Claims1
A process for the production of a curable multi-component reaction mixture containing fillers comprising:
- a) premixing the reaction components in a high pressure injection mixer,
- b) introducing the pre-mixed reaction components and dry filler into a friction mixer, said friction mixer having a conically shaped screw having a multiplicity of screw windings, said screw being rotatable in a conical mixing chamber with a gap formed between the wall of said chamber and the screw and operating under a fractional load, with said screw rotating at a speed of from 500 to 5,000 rpm, and wherein the ratio of the volume between the screw windings to the volume of said gap is from about 1:1 to about 5:1,
- c) introducing the mixture of step b) into a mold,
- d) stopping the supply of reaction components and filler once said mold is filled, and
- e) increasing the speed of said screw to 12,000 rpm or higher and bringing said screw into contact with the wall of said mixing chamber in order to clean said chamber.
2 more elements
Dependencies are inferred from the claim text.