Liquid phase polyols which are alkylene oxide adducts of terephthalic esters from recycled polyethylene terephthalate
US4485196A · kind A · utility
31Cited by
4References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1983 |
| Grant date | Nov 27, 1984 |
| Priority date | — |
| Expiry date | Sep 26, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/62
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A mixture of aromatic polyester polyols useful in preparing rigid foams is described. The polyols are made by first reacting recycled polyethylene terephthalate (PET) scrap with an alkylene glycol to form a reaction product which is then reacted with an alkylene oxide, such as propylene oxide. The resultant mixture of aromatic polyester polyols is a homogeneous liquid which does not precipitate solids upon standing, as do some prior art PET-derived polyols.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.