Method for recovering polyol from a polyurethane
US4044046A · kind A · utility
6Cited by
1References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1975 |
| Grant date | Aug 23, 1977 |
| Priority date | — |
| Expiry date | Jul 31, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/62
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for recovering polyol from a polyurethane comprises dissolving the polyurethane in a specific aliphatic diol and heating the dissolved polyurethane in the presence of a halogenated ester of phosphoric acid to recover the polyisocyanate used for the production of the polyurethane as a solid form and the polyol used for the production of the polyurethane together with the polyol having urethane bond formed by reaction with the aliphatic diol as a liquid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.