Process for treatment of an initial polyethylene-containing material to produce a polyethylene composition for injection molding
US12415297B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 1, 2023 |
| Grant date | Sep 16, 2025 |
| Priority date | — |
| Expiry date | Feb 1, 2043 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2323/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Process for treatment of an initial polyethylene-containing material to produce a polyethylene composition comprising providing a twin-screw extruder with thermal regulation devices; providing an initial polyethylene-containing material comprising at least 50 wt. % of polyethylene based on the total weight of the initial polyethylene-containing material; extruding the initial polyethylene-containing material to obtain a polyethylene composition; wherein extrusion is performed with a residence time of less than 20 min; and recovering a polyethylene composition; wherein extruding comprises a thermal treatment of the initial polyethylene-containing material at a temperature of at least 300° C. in one or more hot zones of the extruder by self-heating to have a maximum barrel temperature ranging from 300 to 460° C. in at least one hot zone of the extruder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.