Process for preparation of a multilayer flexible packaging material delaminatable by treatment in water
AssigneeSocieta' Azionaria Per L'industria Chimica Italiana S.A.P.I.C.I. S.P.A.
InventorsAttilio BORLENGHI, Matteo NERI MARI, Guglielmo CATEL
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Abstract
A process for preparation of a multilayer flexible packaging material that is selectively delaminated by treatment with water, wherein the method includes the following steps a) providing a polar polymer layer and a non-polar polymer layer; b) coating at least one of the layers, namely the one intended to be selectively recycled, with a polyvinyl alcohol (ethylene-vinyl alcohol) copolymer, partly crosslinkable with water-dispersible polyisocyanate; and c) bonding the coated layers obtained in step b) using a 2K polyurethane adhesive.
Claims14
A process for preparing a multilayer flexible packaging material that is selectively delaminated by treatment with water, said process including the following steps:
- a) providing a polar polymer layer and a non-polar polymer layer;
- b) coating at least one of said layers with a polyvinyl alcohol/ethylene vinyl alcohol copolymer;
- and
- c) bonding the coated layers obtained in step (b) with a 2K polyurethane adhesive.
Dependencies are inferred from the claim text.