Method for preparing polyester-polyepoxide compositions of high melt viscosity
US4933429A · kind A · utility
15Cited by
1References
20Claims
0Family size
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Key dates
| Filing date | Mar 13, 1989 |
| Grant date | Jun 12, 1990 |
| Priority date | — |
| Expiry date | Mar 13, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L63/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyesters, especially poly(ethylene terephthalate) and poly(butylene terephthalate), having a substantial proportion of free carboxylic acid groups are caused to react with polyepoxy compounds, especially poly(O- or N-epoxyalkyl-substituted) cyclic amides, imides and amidates and preferably triglycidyl isocyanurate, in the presence of various amines or salts as catalysts. The preferred catalysts are fatty acid salts such as sodium sterate. The products have very high melt viscosities and are useful in such operations as blow molding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.