Polyvinyl chloride containing a filler
AssigneeKestrel Chemicals Limited
InventorsWilliam S. Underwood, Louis Bohm
Life of this patent
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Abstract
A solid resin composition comprises thermoplastic resin (for example polyvinyl chloride, especially unplasticized (PVC)) and, as a filler, a particulate amorphous silica that has been obtained by a process in which silica is reduced and the reduction product is oxidized in the vapor phase to form silica. A preferred silica is obtained as by-product in the production of silicon metal or ferrosilicon in a reduction furnace. The filler can be used at loadings as high as 250, preferably up to 150, parts per hundred parts of resin. Artifacts formed from the compositions, for example by extrusion or moulding, include pipes, conduits, gutters and soles for footwear.
Claims20
A solid resin composition suitable for forming into artifacts, characterised in that it contains a thermoplastic polyvinyl chloride resin and, as a filler, particulate amorphous silica, which silica is obtained by a process in which silica is reduced and the reduction product is oxidised in the vapour phase to form silica.
Dependencies are inferred from the claim text.