Thermally expandable microspheres prepared from bio-based monomers
US11208538B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 2018 |
| Grant date | Dec 28, 2021 |
| Priority date | — |
| Expiry date | Dec 24, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2335/02
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present disclosure provides thermally expandable microspheres at least partially prepared from bio-based monomers and a process of their manufacture. The microspheres include a thermoplastic polymer shell encapsulating a blowing agent. The thermoplastic polymer shell includes a copolymer of an itaconate dialkylester and at least one aliphatic or aromatic mono-ethylenically unsaturated comonomer. The itaconate dialkylester has the formula (1):where each of R1 and R2, separately from one another, is an alkyl group having 1-4 carbon atoms, and the copolymer includes 0-50 wt. % of vinyl aromatic comonomers, based on the total weight of the comonomers. The present disclosure further provides expanded microspheres usable in a variety of applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.