Back to results
US 11,767,462 B2Granted
Polyvinyl alcohol-based particulate compositions
AssigneeKuraray Co., Ltd.
InventorsGhebrehiwet Ghebremeskel, Takuma Kaneshima, Keisuke Morikawa, Amanda Reneau
Life of this patent
Estimating the term…
Abstract
Disclosed are particulate compositions comprising particles of a blend of one or more polyvinyl alcohol polymers with one or more aliphatic polyester polymers, wherein such particulate compositions are useful, for example, as plugging agents for treatments applied to a subterranean formation traversed by the borehole of an oil or gas well.
Claims21
A particulate composition comprising particles including a blend comprising:
- (a) one or more polyvinyl alcohol polymers;
- (b) one or more aliphatic polyester polymers, wherein the one or more aliphatic polyester polymers comprise an aliphatic polyester polymer grafted with a hydrophilic monomer selected from the group consisting of methacrylates, ethylene glycols, allylic alcohols, acrylates, methacrylamides, pyrrolidones, vinyl alcohol, methacrylic acid, and acrylic acid, and
- (c) optionally one or more additives, wherein the blend comprises:
- (i) from about 5 wt % to about 95 wt % of the one or more polyvinyl alcohol polymers, and
- (ii) from about 5 wt % to about 95 wt % of the one or more aliphatic polyester polymers, based on the combined weight of the one or more polyvinyl alcohol polymers and the one or more aliphatic polyester polymers.
2 more elements
A particulate composition comprising particles including:
- a uniform blend comprising:
- (a) one or more polyvinyl alcohol polymers;
- (b) one or more aliphatic polyester polymers;
- and
- (c) optionally one or more additives;
- wherein the uniform blend comprises:
- (i) from about 5 wt % to about 95 wt % of the one or more polyvinyl alcohol polymers, and
- (ii) from about 5 wt % to about 95 wt % of the one or more aliphatic polyester polymers,
- based on the combined weight of the one or more polyvinyl alcohol polymers and the one or more aliphatic polyester polymers, and
- wherein the one or more polyvinyl alcohol polymers comprise a hydrolyzed copolymer of vinyl acetate and ethylene as comonomers, having an ethylene content of from about 0.1 mol % to about 15.0 mol % based on the total moles of comonomers.
7 more elements
Dependencies are inferred from the claim text.