Process for polymerization of tetrahydrofuran using acidic zeolite catalysts
US5466778A · kind A · utility
4Cited by
1References
1Claims
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Key dates
| Filing date | Oct 19, 1993 |
| Grant date | Nov 14, 1995 |
| Priority date | — |
| Expiry date | Oct 19, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/2657
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is an improved process for polymerization of tetrahydrofuran to prepare poly(tetrahydrofuran) products with a MW range of 200 to 5000 and a dispersity of <2, which comprises premixing a carboxylic anhydride, such as, for example acetic anhydride and a dealuminated Y-zeolite and subsequently adding tetrahydrofuran at a temperature below 100.degree. C., wherein the order of addition of reactants is critical and the yield is improved by premixing the acetic anhydride and zeolite and then adding tetrahydrofuran.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.