Thermally expandable cellulose-based microspheres
US12338336B2 · kind B2 · utility
0Cited by
3References
20Claims
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Key dates
| Filing date | Nov 12, 2019 |
| Grant date | Jun 24, 2025 |
| Priority date | — |
| Expiry date | Jan 12, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2301/10
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The disclosure relates to thermally expandable microspheres comprising a polymeric shell surrounding a blowing agent-containing hollow core, the polymer shell comprising a carboxylate-functionalised cellulose having a glass transition temperature (Tg) of at least about 125° C. The disclosure also relates to a method for preparing such thermally expandable microspheres, comprising mixing an aqueous phase that optionally comprises an emulsifier with an organic phase that comprises an organic solvent, a blowing agent and a carboxylate-functionalised cellulose having a Tg of at about least 125° C., to form a microsphere dispersion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.