Expandable polymer particles
US11434357B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 15, 2019 |
| Grant date | Sep 6, 2022 |
| Priority date | — |
| Expiry date | Sep 5, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2433/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a composition comprising an aqueous dispersion of first polymer particles functionalized with structural units of t-butyl methacrylate or t-butyl acrylate, and imbibed with a catalyst of Structure (I), where R, R1, R2 and R3 are as defined herein, and a process for making the composition. The present invention also relates to an aqueous dispersion of core-shell polymer particles, wherein the first polymer particles are encapsulated in a shell having a high Tg. The imbibed first polymer particles and the core-shell polymer particles can be expanded in the dry state at significantly lower temperatures than reported in the prior art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.