Abstract:
Barrier films are prepared from a blend of two high density polyethylene blend components and a high performance organic nucleating agent. The two high density polyethylene blend components have substantially different melt indices. Large reductions in the moisture vapor transmission rate of the film are observed in the presence of the nucleating agent when the melt indices of the two blend components have a ratio of greater than 10/1. The resulting barrier films are suitable for the preparation of packaging for dry foods such as crackers and breakfast cereals.
Abstract:
The present invention discloses a semicrystalline polymer/graphene oxide composite film, comprising: a first semicrystalline-typed polymer, distributed in structural space of the composite film and having a porous structure; and graphene oxide, having a layered structure and distributed in the composite film wherein gas passage exist between adjacent layered structures, the first semicrystalline-typed polymer existing between part of adjacent layered structures forms into a second semicrystalline-typed polymer by further heat treatment after the first semicrystalline-typed polymer and graphene oxide are blended uniformly to be distributed in the composite film so as to fill and seal a portion of the porous structure to block gas from flowing to extend path length(s) of gas passage; wherein graphene oxide existing between the first semicrystalline-typed polymers induces formation of the second semicrystalline-typed polymer.
Abstract:
The present invention provides a packing sheet and PTP packing body, which do not include halogen materials such as chlorine and fluorine and have high water vapor barrier property. The packing sheet of the present invention includes at least a high-density polyethylene resin (A), petroleum resin (B), and amorphous polyolefin resin (C). Also, it is preferable that the weight blending ratio ((A+B)/C) of the total weight of the high-density polyethylene (A) and the petroleum resin (B) to the weight of the amorphous polyolefin (C) be 50/50 or more and 90/10 or less.
Abstract:
Disclosed herein are polyesters and articles made therefrom. The article comprising a substrate comprising a first surface and a second surface, the second surface in contact with an outside environment, wherein the substrate comprises a polymer comprising poly(trimethylene furandicarboxylate) (PTF), and wherein the polymer provides an improvement in gas barrier properties of the substrate as compared to a substrate comprising nascent polyethylene terephthalate) (PET).
Abstract:
Herein is disclosed an oxygen barrier composition comprising an oxygen barrier polymer and an oxygen scavenging polymer. Preferably, the oxygen barrier polymer is selected from polymers or copolymers of vinyl alcohol, polyesters, polymers or copolymers of vinylidene dichloride, polymers or copolymers of epoxies, polysulfones, polymers or copolymers of acrylonitrile, polymers or copolymers of isocyanates, or polyamides other than MXD6; and the oxygen scavenging polymer either comprises an ethylenic backbone and a cyclic olefinic pendant group of structure I, or a polyester group of structure II or structure III: wherein q1, q2, q3, q4, and r are independently selected from hydrogen, methyl, or ethyl; m is —(CH2)n—, wherein n is an integer from 0 to 4, inclusive; X is null or a linking group; and, when r is hydrogen, at least one of q1, q2, q3, and q4 is also hydrogen. The oxygen barrier composition can be formed into an oxygen barrier layer of a packaging article. Such layers and articles, and methods for making same, are also disclosed.
Abstract:
The present invention provides compositions useful as a barrier layer in, for example, packaging products. The compositions generally comprise a blend of (i) a polyester resin, preferably an aromatic polyester resin such as polyethylene terephthalate (PET) and (ii) a polyamide material (e.g., MXD6). The blend optionally may further comprise (iii) an oxygen scavenging material. The present invention also provides containers (e.g., containers formed by expansion of preforms) having a multilayered body-forming portion including: a core layer comprising the aforementioned blend; and inner and outer layers of a formable polymer composition. The present invention also provides methods of making such containers .
Abstract:
Herein is disclosed a blend of a neat oxygen scavenging polymer and a second polymer. The blend can be prepared by extrusion of a neat formulation of the oxygen scavenging polymer and the second polymer. Also disclosed are methods for preparing the neat formulation of the oxygen scavenging polymer, and packaging articles prepared from the blend. In addition, compositions comprising a branched oxygen scavenging polymer and a second polymer are disclosed, as well as packaging articles prepared from such compositions.
Abstract:
Polyolefin films having high oxygen transmission values are composed of blends of 75 to 92% isotactic polypropylene, 5 to 15% by weight low density polyethylene and 3 to 10% by weight of an olefin heteropolymer containing propylene and at least one other olefin 2 to 4 carbon atoms having a melting point less than that of polypropylene and a density ofr at least about 0.95 g/cc.
Abstract:
Disclosed are an oxygen barrier resin composition and products containing the resin. The resin composition comprises 20 to 80 wt % of an ethylene-vinyl alcohol copolymer, 5 to 79 wt % of an ethylene copolymer, and 1 to 30 wt % of a compatibilizer obtained between a random copolymer of ethylene-maleic anhydride-alkyl(meth)acrylate and a polyamide oligomer ranging, in molecular weight, from 1,000 to 5,000. The compatibilizer functions in such a way that the main chain of the polyamide penetrates into the ethylene-vinyl alcohol phase while the main chain of the ethylene-alkyl(meth)acrylate exists in the ethylene copolymer phase. The resin composition is superior in both melt-moldability and compatibility, providing films, sheets or bottles with superb appearance (transparency), mechanical strength and oxygen barrier.
Abstract:
Provided are a composition having excellent gas barrier property and low-temperature impact resistance, and a liner for high-pressure gas storage tanks containing the same. Particularly, provided are a composition, in which resin particles reinforcing low-temperature impact resistance are dispersed in a gas barrier resin, thereby having excellent gas barrier property and excellent impact resistance while being easily moldable, and a liner for high-pressure gas storage tanks.