Aromatic polyester polycarbonates from polyols derived from recycled polyethylene terephthalate
AssigneeTexaco Inc.
InventorsErnest L. Yeakey, Michael Cuscurida
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Abstract
A novel class of aromatic polyester polycarbonates is described. The polycarbonates are made by reacting an alkylene carbonate with an aromatic polyester polyol over a polycarbonate formation catalyst such as potassium stannate. In turn, the polyol is made by esterifying a dibasic acid waste stream with an alkylene glycol to produce a polyester polyol which is subsequently used to transesterify recycled polyethylene terephthalate.
Claims8
An aromatic polyester polycarbonate of the structure ##STR6## where m and n independently are integers of from 1 to 5, r is an integer of from 1 to 5, X is hydrogen, methyl or ethyl and R is the residue of an aromatic polyester polyol of the structure ##STR7## where x is an integer of from 2 to 4.
An aromatic polyester polycarbonate made by the process comprising reacting an alkylene carbonate selected from the group consisting of ethylene carbonate, propylene carbonate and butylene carbonate with an aromatic polyester polyol in the presence of a polycarbonate formation catalyst selected from the group consisting of potassium stannate, potassium carbonate, barium oxide, zinc borate and calcium hydroxide, where the aromatic polyester polyol is made by the process of esterifying a dibasic acid waste stream with an alkylene glycol to produce a polyester polyol and transesterifying recycled polyethylene terephthalate with the polyester polyol from the previous step.
A polyurethane foam obtained by reacting in the presence of a blowing agent and a catalyst of polyurethane formation an organic polyisocyanate, a polyol and an organic polyester polycarbonate, where the polycarbonate is made by the process comprising
- reacting an alkylene carbonate selected from the group consisting of ethylene carbonate, propylene carbonate and butylene carbonate with an aromatic polyester polyol in the presence of a polycarbonate formation catalyst selected from the group consisting of potassium stannate, potassium carbonate, barium oxide, zinc borate and calcium hydroxide, where the aromatic polyester polyol is made by the process of esterifying a dibasic acid waste stream with an alkylene glycol to produce a polyester polyol and transesterifying recycled polyethylene terephthalate with the polyester polyol from the previous step.
Dependencies are inferred from the claim text.