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US 12,466,944 B2Granted
Core/shell type polymer microparticles, dispersion of particles, and method for producing said microparticles
AssigneeMaruzen Petrochemical Co., Ltd.
InventorsShinji Sugihara, Takao Nishiura, Kento Fujiura
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Abstract
Provided are core/shell type polymeric particles including a shell and a core, in which the particles can be produced by a method using neither a surfactant nor a high-molecular-weight azo initiator, exhibit satisfactory dispersibility in aqueous medium, and are useful as, for instance, a dispersant, a metal-protecting stabilizer, or a metal adsorbent. A core/shell type polymeric particle including a shell including a hydrophilic vinyl ether polymer (a) and a core including a hydrophobic polymer (b).
Claims6
A core/shell type polymeric particle, comprising
- a shell comprising a hydrophilic vinyl ether polymer (a);
- and
- a core comprising a hydrophobic polymer (b),
- wherein a monomer as a component of the hydrophobic polymer (b) is one or more of monomers selected from the group consisting of an olefin, an aromatic vinyl compound, (meth) acrylic acid, a (meth) acrylic acid derivative, (meth) acrylamide, a (meth) acrylamide derivative, and a vinyl ester of saturated aliphatic carboxylic acid,
- wherein the hydrophilic vinyl ether polymer (a) and the hydrophobic polymer (b) are each a linear polymer,
- wherein a terminal of the hydrophilic vinyl ether polymer (a) is chemically bonded to a terminal of the hydrophobic polymer (b),
- wherein the core/shell type polymeric particle has a mass ratio of the hydrophilic vinyl ether polymer (a) to the hydrophobic polymer (b) of 1:10 to 10:1,
- wherein the core/shell type polymeric particle has an average particle size of from 250 to 2000 nm, and
- wherein the core/shell type polymeric particle has a polydispersity index (PDI) of greater than 0.1.
6 more elements
Dependencies are inferred from the claim text.