Process for the continuous high temperature glycolytic cleavage of polyurethane plastics waste in screw machines
US4511680A · kind A · utility
10Cited by
13References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1983 |
| Grant date | Apr 16, 1985 |
| Priority date | — |
| Expiry date | Aug 24, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/62
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for the continuous glycolytic cleavage of polyurethane plastics waste in multi-shaft screw machines by the addition of optionally preheated diols, at a degradation temperature of 250.degree. C., while maintaining a pressure at least such that the polyurethane-diol mixture is in the liquid phase, by the discharge of the glycolysate mixture after short residence times of from 2 to 30 minutes in the reaction screw, and by rapid cooling of the glycolysate mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.