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US 6,291,630 B1Granted
Method for producing a liquid formulation of tetraphenylphosphonium phenolate
AssigneeBayer Aktiengesellschaft
InventorsAnnett König, Michael Prein
Life of this patent
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Abstract
A catalyst formulation that is liquid at room temperature and that comprise tetraphenylphosphonium phenolate and phenol is disclosed. The catalyst formulation is suitable as a transesterification catalyst and most especially in the preparation of thermoplastic solvent-free polycarbonates.
Claims4
Catalyst formulation which is liquid at room temperature, comprising 28 to 45 wt. % tetraphenylphosphonium phenolate and 72 to 55 wt. % phenol.
Dependencies are inferred from the claim text.