Hydroxy-functional polyesters as thermoplastic barrier resins
US5171820A · kind A · utility
59Cited by
4References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 13, 1991 |
| Grant date | Dec 15, 1992 |
| Priority date | — |
| Expiry date | May 13, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/668
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyesters having improved barrier to oxygen are normally solid, thermoplastic methylol polyesters having backbone repeating units containing pendent hydroxyl and methylol moieties and divalent organic moieties such as m-phenylene, p-phenylene, and isopropylidene diphenylene. Such polyesters are prepared by reacting diglycidyl esters of aromatic diacids such as diglycidyl terephthalate or diglycidyl ethers of dihydric phenols with diacids such as isophthalic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.