Preparation of poly(ester carbonate) by interfacial method
CA 1137691 A · Owner: Allied Corporation · Inventors: Debona, Bruce T.; Segal, Leon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Poly(ester carbonate) polymers are prepared by reaction of bifunctional phenolates in an aqueous phase with phosgene and with the acyl halide of a bifunctional carboxylic acid halide such as terephthaloyl chloride in an organic solvent such as dichloromethane. At least a portion of the phosgene is reacted with the phenolate before or during reaction of the acid chloride with the phenolate to avoid the formation of polyester blocks which have limited solubility in the organic solvent. After reaction is complete, or at any stage wherein oligomers are formed, the aqueous phase can be cleanly removed and easily separated from the organic phase and the organic, phase readily washed free of …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted December 14, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 14, 1999.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.