Method of recycling laminated molding

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 11/16 (2006.01)

Patent

CA 2546071

A method of recycling a laminated molding, comprising crushing a molding with laminate structure including a layer of main raw material resin, such as PET resin, and at least one layer of aliphatic polyester resin; storing the resultant fragments in a humidified atmosphere so that the water content of the aliphatic polyester resin (layer) is regulated to become 0.5 wt.% or higher; and thereafter washing the fragments with aqueous alkali to thereby remove the aliphatic polyester resin layer and recovering the main raw material resin layer. Thus, the induction period for the operation of aqueous alkali washing that is a main processing operation can be shortened with the result that the overall recovery operation can be streamlined.

L'invention porte sur un procédé de recyclage de produits moulés laminés comprenant une première couche principalement de résine, par exemple de PET, et au moins une couche de résine polyester aliphatique consistant: à les broyer; à les placer dans une atmosphère humide pour que la teneur en eau de la résine polyester aliphatique soit de 0,5 % ou plus; à les laver à l'alcali aqueux pour extraire la résine polyester aliphatique; et à récupérer la première couche de résine. On peut ainsi raccourcir le temps de lavage, principale opération du processus, tout en rationalisant le déroulement du processus de récupération.

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