Process for making polycarbonates using ammonia or ammonia compounds as the catalysts
AssigneeThe Dow Chemical Company
InventorJoseph McClendon Baggett
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Abstract
Thermoplastic polycarbonates are prepared by interfacial polymerization wherein carbonyl halides, dihydric phenols and a catalytic amount of ammonia or an ammonium compound which liberates ammonia during the reaction are reacted. The polycarbonates thus prepared have chloroformate end groups and are useful as intermediates to be capped with various terminal groups in a know manner.
Claims6
A process for making thermoplastic aromatic polycarbonates which comprises reacting under interfacial polycarbonate-forming conditions
- 1. a carbonyl halide,
- 2. a dihydric phenol or mixtures of dihydric phenols, and
- 3. a catalytic amount of ammonia or an ammonium compound which liberates ammonia under the conditions of the reaction.
A process for making thermoplastic polycarbonates which comprises reacting under interfacial polycarbonate-forming conditions
- 1. a carbonyl halide,
- 2. a dihydric phenol or mixtures of dihydric phenols, and
- 3. a catalytic amount of a compound having one of the formulas
- A. nh.sub.3
- b. nh.sub.4 z or
- C. (nh.sub.4).sub.2 z.sub.1
- wherein Z is a monovalent inorganic anion and
- Z is a divalent inorganic anion.
Dependencies are inferred from the claim text.