Delamination-resistant multilayer container, preform, article and method of manufacture

Abstract

A plastic container, preform or article includes a multilayer wall having at least one layer of matrix resin, at least one layer of barrier resin, and an adhesion-promoting material blended with the barrier resin and/or the matrix resin to promote bonding between the barrier and matrix layers. The matrix resin preferably is an ester-containing resin, most preferably a polyester such as PET. The adhesion-promoting material includes an amine polymer, preferably an imine polymer having a plurality of available primary, secondary or tertiary amine groups. An alkylene imine polymer is preferred, particularly a polyethyleneimine polymer.

1 - 61 . (canceled) 
   
   
       62 . A multilayer article comprising a preform for blow molding a plastic container having a multilayer wall or a plastic container having a multilayer wall and, which article includes:
 at least one layer of matrix resin containing an ester containing polymer, at least one layer of barrier resin, and material blended with said barrier resin to promote adhesion between said barrier and matrix layers, said material including an amine polymer.   
   
   
       63 . The article of  claim 62 , wherein said ester containing polymer is polyester and said barrier resin is polyamide or EVOH. 
   
   
       64 . The article of  claim 62 , wherein said matrix resin is polyester resin. 
   
   
       65 . The article of  claim 64 , wherein said polyester resin is PET, PEN, a blend or copolymer of PET and PEN, or regrind that includes PET, PEN or blends or copolymers of PET and PEN. 
   
   
       66 . The article of  claim 62 , wherein the amine polymer is an imine polymer. 
   
   
       67 . The article of  claim 62 , wherein said amine polymer is an alkylene amine polymer. 
   
   
       68 . The article of  claim 67 , wherein said alkylene amine polymer is an alkylene imine polymer. 
   
   
       69 . The article of  claim 68 , wherein said alkylene imine polymer is a polyethyleneimine polymer. 
   
   
       70 . The article of  claim 62 , wherein said barrier resin is EVOH, polyamide, acrylonitrile copolymer, a blend of EVOH and polyamide, a blend of polyester and polyamide, a nanocomposite of EVOH or polyamide and clay, a blend of EVOH and an ionomer, acrylonitrile, a cyclic olefin copolymer, polyglycolic acid, polyvinylidine chloride, or blends thereof. 
   
   
       71 . The article of  claim 62 , wherein:
 the at least one layer of matrix resin comprises at least one layer of polyester resin selected from the group consisting of PET, PEN, blends or copolymers of PET and PEN, and regrind that consists essentially of PET, PEN, or blends or copolymer of PET and PEN,   the at least one layer of barrier resin is selected from the group consisting of EVOH, polyamide, acrylonitrile copolymers, blends of EVOH and polyamide, a blend of polyester and polyamide, nanocomposites of EVOH or polyamide and clay, blends of EVOH and an ionomer, acrylonitrile, cyclic olefin copolymers, polyglycolic acid, polyvinylidene chloride, and blends thereof, and   said material comprises a polyethyleneimine blended in said at least one layer of barrier resin to promote adhesion between said barrier and polyester layers.   
   
   
       72 . The article of  claim 62 , wherein the multilayer plastic article is a multilayer plastic container and the amine polymer is an alkylene amine polymer. 
   
   
       73 . A multilayer plastic article which is a preform for blow molding a plastic container having a multilayer wall or a blow-molded plastic container having a multilayer wall, the article including: a blend of a barrier resin and an adhesion-promoting material comprising an amine polymer, the blend forming layers alternating with layers of matrix resin comprising an ester-containing resin, and in which said amine polymer promotes adhesion between said barrier resin and matrix resin. 
   
   
       74 . The article of  claim 73 , wherein said matrix resin is a polyester resin. 
   
   
       75 . The article in  claim 74 , wherein said polyester resin is PET, PEN, a blend or copolymer of PET and PEN, or regrind that includes PET, PEN, or blends or copolymers of PET and PEN. 
   
   
       76 . The article of  claim 73 , wherein said barrier resin is EVOH, polyamide, acrylonitrile copolymer, a blend of EVOH and polyamide, a blend of polyester and polyamide, a nanocomposite of EVOH or polyamide and clay, a blend of EVOH and an ionomer, acrylonitrile, a cyclic olefin copolymer, polyglycolic acid, polyvinylidene chloride, or blends thereof. 
   
   
       77 . The article of  claim 73 , wherein said ester-containing resin is a polyester resin and said barrier resin is polyamide or EVOH. 
   
   
       78 . A packaging article having a wall, which includes:
 a blend of an alkylene imine polymer with a barrier resin; and   the blend being adjacent an ester-containing resin wherein said article resists migration of carbon dioxide through the wall of said article.   
   
   
       79 . The article of  claim 78 , wherein said barrier resin is selected from EVOH, polyamide, acrylonitrile copolymer, a blend of EVOH and polyamide, a blend of polyester and polyamide, a nanocomposite of EVOH or polyamide and clay, a blend of EVOH and an ionomer, acrylonitrile, a cyclic olefin copolymer, polyglycolic acid, polyvinylidene chloride, or blends thereof. 
   
   
       80 . The article of  claim 79 , wherein said wall is a multilayer wall having at least two plastic resin layers, and wherein said alkylene imine polymer is in one of said layers. 
   
   
       81 . The article of  claim 80 , wherein an other of said at least two plastic resin layers includes polyester resin. 
   
   
       82 . The article of  claim 78 , wherein said alkylene imine polymer is a polyethyleneimine polymer.