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US 5,331,065 AGranted
Process for preparing high molecular weight polyethylene-terephthalate from recycled polyethyleneterephthalate
AssigneesEniricerche S.p.A., Enichem S.p.A.
InventorsRiccardo Po', Nicoletta Cardi, Luisa Fiocca, Antonio Gennaro, Giorgio Giannotta, Ernesto Occhiello
Life of this patent
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Abstract
Polyethyleneterephthalate (PET) originating from the sorted collection of solid urban refuse can be regraded and recycled as such or mixed with virgin PET if treated at high temperature with an oxazoline of general formula: ##STR1##
Claims10
A process for preparing high molecular weight PET from recycled PET, comprising:
- a) reacting the recycled PET at elevated temperature with at least one oxazoline of general formula:
- ##STR3## where R.sub.1, R.sub.2, R.sub.3 and R.sub.4, which can be the same or different, represent a hydrogen atom, a halogen, or an alkyl, cycloalkyl, aryl, alkylaryl, alkoxy or carboxyalkyl radical containing from 1 to 20 carbon atoms, and Z represents a trivalent linear, branched or cyclic aliphatic radical including from 1 to 16 carbon atoms or Z represents an aromatic or alkylaromatic radical containing from 6 to 20 carbon atoms;
- b) cooling the reaction product obtained to ambient temperature.
Dependencies are inferred from the claim text.