Process for recycling articles based on vinyl chloride polymers
US6172125A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 1999 |
| Grant date | Jan 9, 2001 |
| Priority date | — |
| Expiry date | Mar 18, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/62
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Process for recycling an article based on at least one vinyl chloride polymer, in which: PA1 (a) the article is shredded into fragments having an average dimension of 1 cm to 50 cm, should it exceed these dimensions; PA1 (b) the fragments of the article, which are substantially dry, are brought into contact with a substantially anhydrous solvent capable of dissolving the vinyl chloride polymer, forming an azeotrope with water; PA1 (c) the polymer dissolved in the solvent is precipitated by injecting steam in the solution thus obtained, which moreover leads to the stripping of the water-solvent azeotrope and so leaves behind a mixture essentially consisting of water and of solid polymer particles; PA1 (d) the polymer particles are recovered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.