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US-2020071443-A1 · Mar 5, 2020 · US
Core/shell type polymer microparticles, dispersion of particles, and method for producing said microparticles
US12466944B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12466944-B2 |
| Application number | US-201816976955-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 7, 2018 |
| Priority date | Mar 7, 2018 |
| Publication date | Nov 11, 2025 |
| Grant date | Nov 11, 2025 |
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Abstract
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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).
First claim
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The invention claimed is: 1 . 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. 2 . The particle according to claim 1 , wherein the shell is composed of the hydrophilic vinyl ether polymer (a) and the core is composed of the hydrophobic polymer (b). 3 . The particle according to claim 1 , wherein the hydrophilic vinyl ether polymer (a) is represented by the following formula (1): wherein R 1 represents a C 1-5 alkanediyl group, R 2 represents a hydrogen atom or a C 1-3 alkyl group, and n is an integer of 1 to 10. 4 . A core/shell type polymeric particle according to claim 1 , made by a method comprising subjecting a hydrophilic vinyl ether polymer and a hydrophobic monomer which is one or more of a monomer 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 to emulsion polymerization in an aqueous medium. 5 . A core/shell type polymeric particle according to claim 4 , wherein the hydrophilic vinyl ether polymer is represented by the following formula (1): wherein R 1 represents a C 1-5 alkanediyl group, R 2 represents a hydrogen atom or a C 1-3 alkyl group, and n is an integer of 1 to 10. 6 . The particle according to claim 1 , wherein the core/shell type polymeric particle has a polydispersity index (PDI) of 0.15 to 0.9.
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- What does patent US12466944B2 cover?
- 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 inclu…
- Who is the assignee on this patent?
- Maruzen Petrochem Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C08F2/22. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Nov 11 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).