Delamination resistant multilayer containers

摘要

The present invention provides a multilayer plastic bottle comprising layers of PET and a polyamide such as, for example, MXD6, that is free from occurrence of delamination upon dropping or upon exposure to impact. The present inventors have found that when forming a barrier layer containing an adhesion promoting agent according to the present invention, an impact energy applied to the barrier layer is well reduced and the resultant multilayer bottle is improved in interlaminar bonding strength and prevented from suffering from delamination upon dropping, etc.

主权项

1. A plastic container having a multilayer wall comprising:
at least one layer of a barrier resin comprising MXD6 polyamide adjacent to two layers of PET such that there is an interface between the MXD6 polyamide and each of the PET layers, wherein the at least one barrier resin also comprises an adhesion promoting agent blended with the MXD6 polyamide, wherein the adhesion promoting agent is at least one selected from either formula I or formula II: wherein: X is an MXD6 polyamide-compatible oligomeric or polymeric moiety selected from the group consisting of: a polycaprolactone modified phenoxy and a polyurethane; Y is a polyester-compatible oligomeric or polymeric moiety selected from the group consisting of: an aliphatic polyester and a co-polyester; n is an integer from 1 to 100; and m and p represent the mole fractions of the respective parts such that m+p=1, and wherein the adhesion promoting agent bonds the at least one layer of barrier resin with the PET layers across the interfaces.