B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/904
B29C 67/20 (2006.01) B29C 33/38 (2006.01) B29C 33/40 (2006.01) B29C 33/56 (2006.01) B29C 41/00 (2006.01) B29C 41/08 (2006.01)
Patent
CA 1277818
ARTIFICIAL URETHANE ROCK AND METHOD FOR MOULDING ABSTRACT OF THE INVENTION A method for producing simulated rocks by spraying a high density polyurethane elastomer in a flexible mold. The method comprising reproducing a rock in molded form, not limited in size. A flexible mold is prepared by applying numerous coats of latex rubber upon the rock exterior in combination with a fabric embedded within the rubber latex layers. A supporting cradle for the latex mold is produced by spraying a low density urethane foam composition over the latex mold. The mold and cradle are stripped from the rock and are sprayed with a two component structural urethane system employing an isocyanate component and a polyol component with appropriate catalysts, fillers and additives. The structural urethane elastomer is built up to substantial thickness to provide a strong load bearing polyurethane molded rock simulating the original rock surface with curing taking place in a matter of seconds or minutes. After cooling, the molded urethane rock is removed and the mold may be reused for repeated molding operations.
559972
Barclay Edward M.
Jarboe Enos Dean
Jarboe Rodney D.
Futura Coatings Inc.
Osler Hoskin & Harcourt Llp
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