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US 4,888,240 AGranted
High strength particulates
OwnerJohn W. Graham, A. Richard Sinclairinventors
Life of this patent
Estimating the term…
Abstract
A high strength self-consolidating particle comprised of a particulate substrate, a substantially cured inner resin coating and a fusible curable outer resin coating.
Claims19
A high strength free flowing self-consolidating particle comprising:
- a particulate substrate;
- an inner coating of a substantially cured resin covering said substrate said coating increasing the crush resistance of said substrate;
- and
- a non-tacky solid outer coating of heat fusible curable resin covering said inner coating.
1 more element
A high strength free flowing self-consolidating particle comprising:
- a particulate substrate suitable for use as a proppant;
- an inner coating of a substantially cured phenol-formaldehyde resin covering said substrate said coating increasing the crush resistance of said particulate substrate;
- and
- an non-tacky solid outer coating of a heat fusible, curable phenolformaldehyde novolac resin covering said inner coating and having sufficient unreacted hexamethylenetetramine incorporated therein to render said outer coating heat reactive.
1 more element
A high strength free flowing self-consolidating particle comprising:
- a particulate substrate suitable for use as a proppant selected from the group consisting of silica sand, glass, sintered bauxite and aluminum oxide;
- an inner coating of a substantially cured phenol-formaldehyde resin covering said substrate, said coating comprising from about 0.5 to about 5 weight percent, by weight of substrate of said particle, said coating increasing the crush resistance of said substrate;
- and
- a non-tacky solid outer coating of a heat fusible, curable phenolformaldehyde novolac resin covering said inner coating and having sufficient unreacted hexamethylenetetramine incorporated therein to render said outer coating heat reactive, said outer coating comprising from about 0.5 to about 5 weight percent by weight of substrate of said particles.
1 more element
A high strength free flowing self-consolidating particle comprising:
- a silica sand suitable for use as a proppant;
- an inner coating of a substantially cured phenol-formaldehyde resin covering said sand having an organo-functional silane coupling agent incorporated therein said coating comprising from about 0.5 to about 5 weight percent by weight of sand of said particles, said coating increasing the crush resistance of said sand;
- and
- a non-tacky outer coating of a heat fusible, curable phenolformaldehyde novolac resin covering said inner coating and having sufficient unreacted hexamethylenetetramine incorporated therein to render said outer coating heat reactive, said outer coating comprising from about 0.5 to about 5 weight percent by weight of sand of said particles.
1 more element
Dependencies are inferred from the claim text.