Method for impregnation of a part made of plastic material
US10946414B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 29, 2016 |
| Grant date | Mar 16, 2021 |
| Priority date | — |
| Expiry date | Nov 23, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/54
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for core impregnation of a finished part made of plastic material with an additive, including: dissolving the additive in a liquid medium to form a solution; placing the plastic part at ambient pressure in a pressure enclosure; hermetically sealing the chamber; impregnating the plastic part with the solution by a fluid at supercritical or near supercritical conditions in the enclosure at a pressure between 3 MPa and 6 MPa, at a temperature between 25° C. and 65° C. for a duration between 1 minute and 15 minutes; releasing the pressure inside the enclosure so that the liquid medium diffuses outside the plastic part and to trap the additive inside the plastic part.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.