Synthetic roofing elements of the slate type and a method of manufacturing same
OwnerAndre T. Votteinventor
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Abstract
For obtaining a roofing element of the slate type, a synthetic material such as polyethylene, polypropylene or polyvinylchloride is mixed with a charge, such as chalk, kaolin, dolomite, talc, and with carbon black. The proportion by weight of synthetic material is between 30 and 60%, whereas that of the charge is between 20 and 60% and that of the carbon black is between 0.5 and 5%. The mixture is extruded and then calendered.
Claims6
A semi-rigid roofing element resembling slate, said element including integrally formed means for positioning the element in correct overlapping relationship to an underlying roofing element already in place, said element being composed of a synthetic material such as polyethylene, polypropylene or polyvinylchloride, with which is combined a charge of filler material such as chalk, kaolin, dolomite, talc or a similar material and carbon black, the proportion by weight of synthetic material being between 30 and 60%;
- that of the charge of filler material being between 30 and 60% and that of the carbon black being between 0.5 and 5.0%.
Dependencies are inferred from the claim text.