Precured coated particulate material
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United States of America Patent
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Sep 22, 1987
Grant Date -
N/A
app pub date -
May 23, 1986
filing date -
May 23, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to coated particulate matter wherein the particles are individually coated with a cured combination of phenolic/furan resin or furan resin to form a precured resin coating on a proppant such as sand, thereby substantially improving the chemical resistance of the proppant over one having a straight phenolic precured coating. Another embodiment of this invention involves the use of multiple resin coatings on the particulate matter to form a final layered coating containing the desired amount of cured resin. This multiple coating of particulate material results in a final coated product that has a smoother and more uniform surface than particulate material having its entire resin coating applied in a single operation.
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