Composite porous fillers, method of preparation and use
OwnerFrederic Malet, Yves Lermatinventors
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Abstract
The subject of the invention is a novel method of preparing a composite powder from a porous filler and a thermoplastic. The subject of the invention is also composite porous fillers, especially porous silicas, containing thermoplastics, and their use.
Claims19
A method of preparing a composite powder from a porous filler and a thermoplastic, comprising the steps of:
- a) supplying the porous filler and the thermoplastic, each being in the form of solid particles to form a dry blend;
- and
- b) stirring and heating the dry blend at a temperature ranging from 20° C. to 300° C., above the melting point of the thermoplastic in order to absorb the elastomer in at least part of the pore volume.
A composite powder comprising a porous silica having a pore volume which ranges from 0.5 to 5 ml/g, the absorptivity of which, measured according to the DIN ISO 787N standard, ranges from 100 to 400 ml/100 g, and the mean diameter of which lies in the range from 25 to 50 microns, the said porous silica containing a thermoplastic in at least part of the pore volume.
Dependencies are inferred from the claim text.