▎ 摘　　要

NOVELTY - Coated particle (100) comprises: a particulate substrate (10); a surface copolymer layer (20) surrounding the particulate substrate, where the surface copolymer layer comprises a copolymer of at least two monomers comprising styrene, methyl methacrylate, ethylene, propylene, butylene, imides, urethanes, sulfones, carbonates, and acrylamides; and a resin layer (30) surrounding the surface copolymer layer, where the resin layer comprises a cured resin. USE - The particle is useful in hydraulic fracturing composition for treating a subterranean formation (all claimed). ADVANTAGE - The particle utilizes surface copolymer layer and resin layer that increase roundness and/or sphericity of the particulate substrate and impart mechanical stability and greater crush strength to the particulate substrate. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (a) preparing a coated particle, comprising preparing a first mixture comprising at least one polymerizable material, an initiator, and optionally a solvent, contacting the first mixture to a particulate substrate to form a polymerization mixture, heating the polymerization mixture to cure the polymerizable material and form a polymer-coated particulate comprising the particulate substrate and a surface copolymer layer surrounding the particulate substrate, preparing a second mixture comprising the polymer-coated substrate, an uncured resin, and a solvent, adding a curing agent to the second mixture to cure the uncured resin and form the coated particle, where the coated particle comprises the particulate substrate, the surface copolymer layer surrounding the particulate substrate, and a resin layer surrounding the surface copolymer layer, the resin layer comprising a cured resin; (b) a hydraulic fracturing composition comprising a fluid medium and coated particles dispersed within the fluid medium; and (c) treating a subterranean formation, comprising contacting a subterranean formation with the hydraulic fracturing composition and propagating at least one subterranean fracture in the subterranean formation with the hydraulic fracturing fluid. DESCRIPTION OF DRAWING(S) - The figure shows a coated particle in which a particulate substrate is surrounded by a surface copolymer layer and in which the surface copolymer layer is surrounded by a resin layer. Particulate substrate (10) Surface copolymer layer (20) Resin layer (30) Coated particle (100)