Liquid terephthalic ester polyols and polyisocyanurate foams therefrom
US4469824A · kind A · utility
39Cited by
14References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1983 |
| Grant date | Sep 4, 1984 |
| Priority date | — |
| Expiry date | Nov 18, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/902
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Terephthalic esters may be made to remain in a liquid form by reacting recycled or scrap polyethylene terephthalate (PET) with diethylene glycol and one or more oxyalkylene glycols and stripping out some of the ethylene glycol present. The mole ratio of glycols to scrap PET should also be greater than 1.2:1. This process keeps any diesters from separating out of the solution as solids. These liquid terephthalic esters are useful as polyol extenders in rigid polyurethane foams and as the sole polyol component in polyisocyanurate foams.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.