This invention relates to packaging applications. It generally relates to polyethylene or ethylene/α-olefin copolymer based co-extruded, multi-layer films or sheets—rigid or flexible—for thermoforming into shaped containers such as packaging containers. Inter alia, the films have improved barrier properties, toughness, and snapability. Particularly, the films of the present invention comprise one or more stacks of polypropylene layers, wherein at least one stack comprises nucleating agents. In one embodiment, the polypropylene layers in the stack are provided such that any two adjacent layers have different microstructures that provide a interface or interphase between the two layers with likely different microstructures and/or crystallinity. The overall polypropylene stack structure assists in disrupting the transport of oxygen, thereby providing a laminate or structure, for example a rigid film or sheet, with enhanced oxygen-barrier properties. The invention also relates a process for preparing shaped articles such as containers from such films, and to such shaped articles—rigid or flexible—both filled and unfilled.

A packaging material comprising a graphene-reinforced polymer matrix composite (G-PMC) is disclosed. The packaging material has improved barrier resistance to gas and liquid permeants. Also disclosed is a method of improving barrier resistance of a polymer to a permeant, the method comprising forming a graphene-reinforced polymer matrix composite within the polymer. The packaging material may be used for packaging food, drug, perfume, etc. and to make various containers.

A propylene polymer satisfying (a) below, a soft propylene copolymer satisfying (b) below, and a polyolefin containing a structural unit derived from an unsaturated carboxylic acid and/or a derivative thereof, wherein (a) a melting point is 100° C. or more, and (b) an MFR is in the range of 0.01 to 100 g/10 min, at least one of the following requirements (b-1) and (b-2) is satisfied: (b-1) a syndiotactic triad fraction s 60% or more, and (b-2) a structural unit derived from propylene is 55 to 90 mol % and a structural unit derived from at least one olefin having 2 to 20 carbon atoms (excluding propylene) is contained at 10 to 45 mol % (with provisos), and the relation between an intrinsic viscosity [η] (dL/g) and the MFR satisfies the relation: 1.50×MFR.sup.−0.20≤[η]≤2.65×MFR.sup.−0.20.

The breathable sheet of the present invention is comprised of a 4-methyl-1-pentene-based polymer or a resin composition containing the 4-methyl-1-pentene-based polymer as a main component. In addition, the breathable sheet of the present invention is preferably selected from the group consisting of a net, a mesh, a non-woven fabric, a woven fabric, and a perforated sheet.

The present invention is directed to a multimodal polyethylene copolymer comprising a first and a second copolymer of ethylene and at least two alpha-olefin comonomers. Such multimodal copolymers are highly suitable for conversion processes that require a high Draw Down Ratio, like the production of thin films. Such multimodal polyethylene copolymers provide a good impact strength in the sense of a high Dart drop impact strength (DDI) and good isotropy of the films produces thereof. The invention further presents final articles such as films made therefrom.

A method of forming a flexible packaging film includes providing a first web including a polymer sealant layer, the first web having a first major surface and a second major surface opposite the first major surface. A second web including a polymer outer layer is provided, the second web having a third major surface and a fourth major surface opposite the third major surface. An adhesive layer is applied to the second major surface and the first web is laminated to the third major surface. Prior to laminating the first web to the second web, one or more slits are formed in the second web.

A packaging article includes an outer, intermediate, and inner paper plies. A first adhesive layer is disposed between the inner and intermediate paper plies for gluing the inner paper ply to the intermediate paper ply. A second adhesive layer is disposed between the intermediate and outer paper plies for gluing the intermediate paper ply to the outer paper ply. The first and second adhesive layers overlap and are coaligned. The outer, intermediate, and inner paper plies are adjoined to form a multiwall structure, wherein the first adhesive layer and the second adhesive layer are coaligned with each other on the multiwall structure. The first adhesive layer comprises a first plurality of adhesive spots and the second adhesive layer comprises a second plurality of adhesive spots, wherein the adhesive spots of the first plurality of adhesive spots do not overlap with the adhesive spots of the second plurality of adhesive spots.

A gas barrier film formed of a cured product of a mixture including a polycarboxylic acid, a polyamine compound, and a polyvalent metal compound, in which in an infrared absorption spectrum of the gas barrier film, an area ratio of an amide bond represented by B/A is equal to or less than 0.380, an area ratio of a carboxylic acid represented by C/A is equal to or less than 0.150, and an area ratio of carboxylate represented by D/A is equal to or more than 0.520.

First, a composite preform 70 including a preform 10a and a plastic member 40a in close contact with the outer surface of the preform 10a is made by preparing the preform 10a made of plastic material and arranging the plastic member 40a to surround the outer surface of the preform 10a. Subsequently, the composite preform 70 is heated and inserted in a blow molding die 50 and undergoes blow molding in the blow molding die 50, by which the preform 10a and the plastic member 40a of the composite preform 70 are inflated integrally and a composite container 10A is obtained.

An ethylene-vinyl alcohol copolymer composition contains: (A) an ethylene-vinyl alcohol copolymer including two or more types of ethylene-vinyl alcohol copolymers having different ethylene structural unit contents; and (B) an iron compound; wherein the iron compound (B) is present in an amount of 0.01 to 5 ppm on a metal basis based on the weight of the ethylene-vinyl alcohol copolymer composition. The ethylene-vinyl alcohol copolymer composition is substantially free from coloration and excellent in heat stability.