Delamination-resistant multilayer container, preform, article and method of manufacture
AssigneeGraham Packaging PET Technologies Inc.
InventorPhilip D. Bourgeois
Life of this patent
Estimating the term…
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.
Claims18
A method of making a multilayer plastic container that includes:
- (a) blending with a barrier resin, an adhesion-promoting material comprising alkylene imine polymer, and (b) forming a preform in which the blend formed in step (a) is in layers alternating with layers of polyester resin, and in which said alkylene imine polymer promotes adhesion between said barrier resin and said polyester resin.
A method of making 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 method including:
- (a) blending with a barrier resin, an adhesion-promoting material comprising an amine polymer, and (b) forming an article in which the blend formed in step (a) is in layers alternating with layers of matrix resin comprising an ester-containing resin, and in which said amine polymer promotes adhesion between said barrier rsin and said matrix resin, wherein said step (b) is carried out while at least one of said blend formed in said step (a) and said matrix resin is in melt phase, and wherein said amine polymer is an alkylene imine polymer.
A method of making 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 method including:
- (a) blending with a barrier resin, an adhesion-promoting material comprising an alkylene imine polymer, and (b) forming an article in which the blend formed in step (a) is in layers alternating with layers of matrix resin comprising an ester-containing resin, and in which said alkylene imine polymer promotes adhesion between said barrier resin and said matrix resin, wherein said ester-containing resin is a polyester resin and said barrier resin is polyamide or EVOH.
A method of making 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 method including:
- (a) blending with a barrier resin, an adhesion-promoting material comprising an alkylene imine polymer, and (b) forming an article in which the blend formed in step (a) is in layers alternating with layers of matrix resin comprising an ester-containing resin, and in which said alkylene imine polymer promotes adhesion between said barrier resin and said matrix resin, wherein said barrier resin is EVOH, polyamide, an 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.
A method of making an article, which includes:
- blending an alkylene imine polymer with a barrier resin;
- and
- positioning the blend adjacent an ester-containing resin to form said article that resists migration of carbon dioxide through a sidewall of said article.
Dependencies are inferred from the claim text.