Trisstannoxanes useful for polymerizing macrocyclic poly(alkylene dicarboxylate) oligomers
US5386037A · kind A · utility
33Cited by
5References
5Claims
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Key dates
| Filing date | Jun 20, 1994 |
| Grant date | Jan 31, 1995 |
| Priority date | — |
| Expiry date | Jun 20, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F7/2224
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Novel trisstannoxanes are prepared by the reaction of a dialkyltin oxide with a trihydroxy compound such as 1,1,1-tris(hydroxymethyl)propane. They may be employed as catalysts for the preparation of branched polyesters from macrocyclic polyester oligomers. They are less susceptible than previously known catalysts to the presence of acidic impurities in the oligomer compositions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.