| 摘要 |
A composition comprises particles of polymer which can be formed into a continuous phase coherent body and more than 25% by wt. of particles of a filler, having at least one dimension less than one micron, which are present in the composition as individual non-agglomerated particles, are adhered to the polymer particles and are uniformly distributed throughout the composition. The polymer may be polyethylene (e.g. atactic or linear) or polypropylene (e.g. isotactic or atactic). The filler may be asbestos or diatomaceous earth. The composition may be formed by milling the polymer and filler particles in a rotary impact mill which is illustrated by 3 Figures (not shown). In an example asbestos and polypropylene were mixed with sufficient trichlorethylene to gel the polypropylene at 200 DEG F., the asbestos was dispersed in the gel and the trichlorethylene was the evaporated to leave a powder which was milled. The composition may be formed into an integral body by moulding, casting, extruding, drawing or rolling.
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