Composition and method for controlling polymerization rate of cyclic polycarbonate oligomer with encapsulated catalyst
US4755588A · kind A · utility
8Cited by
2References
11Claims
0Family size
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Key dates
| Filing date | Aug 22, 1986 |
| Grant date | Jul 5, 1988 |
| Priority date | — |
| Expiry date | Aug 22, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/30
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The polymerization rate of a cyclic polycarbonate oligomer composition to linear polycarbonates is controlled by encapsulating a polycarbonate formation catalyst in a thermoplastic polymer which is soluble or stably dispersible in said oligomer compositions at elevated temperatures; blending the encapsulated catalyst with the oligomer composition under non-polymerization conditions; and heating the blend to a temperature at which polymerization takes place. Among the polymers suitable for encapsulating the catalyst are polyetherimides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.