Organic polymeric particles, paper coating compositions and methods
US10189958B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 2017 |
| Grant date | Jan 29, 2019 |
| Priority date | — |
| Expiry date | Oct 24, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2989
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of forming an organic polymeric particle, comprising (i) forming a core of an organic hydrophilic polymer with monomers that contains an acid group, a latent acid group, or a combination thereof; (ii) forming a shell that comprises an organic polymer with monomers that contains an acid group, a latent acid group, or a combination thereof to encapsulate the core, where the shell has an initial size; expanding the core to form a hollow porous structure from the shell, where the hollow porous structure has an expanded size larger than an initial size of the shell; and (iii) hydrolyzing the acid group, the latent acid group or the combination thereof of the hollow porous structure and the organic hydrophilic polymer to give the organic polymeric particle a void volume fraction of 40 percent to 85 percent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.