International Paper Company

Ashok M Adur

Thomas Z Fu

Raymond A Volpe

Keith S Shih

Jongsoo Lee

Gerald A Marano

Prasad Shrikrishna Potnis

Charles J Davis

Henry L Mei

Wayne Chu

The specification discloses a layered composite containing a barrier layer comprising clay homogeneously dispersed in a continuous phase of polymeric material. The barrier layer is especially useful in the manufacture of liquid food containers. The clay/polymer barrier layer is formed by dispersing the clay in molten polymeric material to form a homogeneously dispersed clay in a continuous polymer phase. The barrier layer is then applied adjacent one surface of a paperboard component of the composite at a thickness ranging from about 1 to 30 microns. The paperboard may be coated or uncoated at the time the barrier layer is applied, and additional polymeric barrier layers and tie or adhesive layers may be used in combination with the barrier layer to provide reduced oxygen and water vapor transport through the composite. The method of preparing and applying the barrier layer to a paperboard substrate also significantly reduces process steps required to provide coated paperboard with improved barrier properties.

Clay-filled polymer barrier materials for food packaging applications

A wettable polypropylene composition comprising polypropylene and a hydrophilic, polar compound which includes functional sites selected from the group consisting of carboxyl, hydroxy, ether or ester moieties, wherein the polypropylene composition is wettable, having a contact angle less than or equal to 75.degree.. The hydrophilic polar compounds are selected from the group consisting of maleic anhydride-modified polypropylene (MAPP), acrylic acid modified polypropylene, ethylene acrylate modified polypropylene, polypropylene grafted with a sodium salt of an acrylic acid, polyethylene glycol (PEG), modified polyethylene glycol, polyvinyl alcohol (PVOH), polyvinyl formal (PVF); and monomer and dimer fatty acids having a carbon chain length in the range of 6 to 50, preferably 18 to 36. The compositions can further include the presence of an amorphous compound and surfactants.

Wettable polypropylene composition and related method of manufacture

A paperboard-based laminated structure for containers produced by co-extrusion coating or lamination of a polyethylene terephthalate layer as the product contact layer and a unique tie-layer on to paperboard, where the tie-layer is specifically ethylene-ethyl or butyl acrylate copolymer or terpolymer. This paperboard structure provides high temperature end-use performance required in dual-ovenable applications and cost savings.

Dual ovenable paperboard structures having unique adhesive tie materials

The specification discloses a polymer blend especially well-suited for coating paperboard substrates used in food packaging, particularly acidic or acid-generating foods such as fruit and vegetable juices. The blend contains an acid-activatable oxygen scavenger dispersed in a film-forming synthetic polymer such as an EVOH copolymer. When placed as a film or layer on the side of the substrate inside the container in contact with the food the blend is effective to reduce the oxygen in the container over time to a very low concentration, replacing the same with carbon dioxide, for an excellent preservative effect.

Oxygen-scavenging filled polymer blend for food packaging applications

A substrate coated with a liquid crystal polymer with an intervening tie layer. A second embodiment provides a surface layer disposed on the LCP layer, sandwiching the LCP layer between the surface layer and the substrate. Methods for constructing the above also is provided.

Multi-layer structure with heat stable high barrier polymer, method

A laminate structure for containers produced using an unique extrudable adhesive tie layer which incorporates an antioxidant material. The antioxidant additive provides for the necessary and superior high temperature end-uses and stability of containers made therefrom.

Enhanced ethylene methyl acrylate adhesive tie material for polyester

A laminate structure for containers produced using product contact materials including polyethylene isophthalate, poly(1,4-cyclohexanyl dimethylene terephthalate) and blends thereof. The unique paperboard structure provides cost savings and high temperature end-use performance required in dual-ovenable containers.

Polyester paperboard ovenable container

A foamable thermal insulating barrier coating produced from an aqueous acrylic based latex emulsion and an unencapsulated chemical blowing agent for coating paper and paperboard and especially suitable for coating one or both sides of cupstock to retain heat and to provide moisture and grease resistance.

Growing community of inventors

Ramsey, NJ, United States of America

Ashok M Adur