Aromatic carbonates
AssigneeGeneral Electric Company
InventorJohn E. Hallgren
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Abstract
An aromatic carbonate process comprising contacting a phenol, carbon monoxide, a base, a Group VIIIB element selected from ruthenium, rhodium, palladium, osmium, iridium or platinum having an oxidation state of plus one. The resulting aromatic mono- and polycarbonates are useful in the preparation of polycarbonates or as polycarbonates, per se, respectively, which can be molded or formed into films, sheets, fibers, laminates or reinforced plastics by conventional techniques.
Claims23
An improved aromatic carbonate process wherein an aromatic carbonate is formed in the substantial absence of an aromatic salicylate which comprises contacting a phenol with carbon monoxide, a base, and a Group VIIIB element selected from ruthenium, rhodium, palladium, iridium, osmium or platinum having an oxidation state of plus one.
An improved aromatic polycarbonate process wherein an aromatic polycarbonate is formed in the substantial absence of an aromatic salicylate which comprises contacting an aromatic polyphenol with carbon monoxide in the presence of a base and a Group VIIIB metal selected from the class consisting of ruthenium, rhodium, palladium, osmium, iridium and platinum having an oxidation state of plus one.
An improved aromatic polycarbonate process wherein an aromatic polycarbonate is formed in the substantial absence of an aromatic salicylate which comprises contacting an aromatic bisphenol of the formula:
- ##STR10## where independently each R.sup.1 and R.sup.2 is hydrogen, C.sub.1-4 alkyl or phenyl and independently each R.sup.3 and R.sup.4 is hydrogen or C.sub.1-4 alkyl, with carbon monoxide in the presence of a base and a Group VIIIB metal selected from the class consisting of ruthenium, rhodium, palladium, osmium, iridium and platinum having an oxidation state of plus one.
An improved aromatic polycarbonate process wherein a polycarbonate is formed in substantial absence of an aromatic salicylate which comprises contacting an aromatic bisphenol of the formula:
- ##STR11## with carbon monoxide in the presence of a base and a Group VIIIB metal selected from the class consisting of ruthenium, rhodium, palladium, osmium, iridium and platinum having an oxidation state of plus one.
An improved aromatic monocarbonate process wherein an aromatic monocarbonate is formed in substantial absence of an aromatic salicylate which comprises contacting an aromatic phenol of the formula:
- R.sub.a (OH).sub.x,
- where R.sub.a represents an aromatic radical wherein the -OH radical is attached directly to an aromatic ring carbon atom and x is the number 1, with carbon monoxide, a base, and a Group VIIIB element selected from the class consisting of ruthenium, rhodium, palladium, osmium, iridium and platinum having an oxidation state of plus one.
An improved aromatic monocarbonate process wherein an aromatic monocarbonate is formed in substantial absence of an aromatic salicylate which comprises contacting a phenol of the formula:
- ##STR12## with carbon monoxide, a base, and a Group VIIIB element selected from the class consisting of ruthenium, rhodium, palladium, osmium, iridium and platinum having an oxidation state of plus one.
Dependencies are inferred from the claim text.