Process for the production of expanded material based on sulfone polymers
US11066532B2 · kind B2 · utility
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11Claims
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Inventors
Key dates
| Filing date | Jan 15, 2018 |
| Grant date | Jul 20, 2021 |
| Priority date | — |
| Expiry date | Mar 17, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2481/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for the production of expanded material based on sulfone polymers includes an extrusion step in an extruder of virgin sulfone polymer with the injection of at least one expanding agent and in the presence of at least one nucleating agent, and a recycling step of part of the expanded material, which provides a recycled product used as raw material fed to the extruder in combination with the virgin sulfone polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.