A polyolefin-based resin film containing (a) 90 to 97 parts by weight of at least one polyolefin-based resin selected from a propylene-ethylene block copolymer and a propylene-α olefin random copolymer and (b) 3 to 10 parts by weight of an ethylene-propylene copolymer elastomer, wherein the propylene-α olefin random copolymer is present in an amount of 0 to 50% by weight relative to the total amount of the propylene-ethylene block copolymer and the propylene-α olefin random copolymer, and the polyolefin-based resin film has a thermal shrinkage ratio in a longitudinal direction of 3% or more and 20% or less, a thermal shrinkage ratio in a rectangular direction to a width direction of 1% or less, and a yield stress in the longitudinal direction of 150 MPa or more and 250 MPa or less.

The present invention describes easy-to-tear polymeric flexible packaging substrate i.e. polymeric film/laminate. The easy-to-tear flexible packaging film is obtained by providing a plurality of non-through micro-indentations on one or both surface of the film. The micro-indentations are located over the entire or partial surface area of the film. The easy-to-tear packaging laminate of the present invention is obtained by providing a plurality of non-through micro-indentations on at least one surface of at least one layer of the packaging laminate. The micro-indentations are located over the entire or partial surface area of the corresponding surfaces of the layers of the laminate. The micro-indentations may have a depth between 1˜70% of the thickness of the polymeric layer. The density of the micro-indentations on a particular surface may be from 10/cm.sup.2 to 10,000/cm.sup.2.

The invention discloses a continuous polyester fiber textile cloth that can be torn into pieces, processing equipment and a processing method. By ultrasonic hot-melting technology, the polyester fiber textile cloth is subjected to the high temperature generated by the high frequency generated by the action of a metal knife mold and an ultrasonic welding head, so that the thread of the loop layers and the base layer are melted in a line to form a thin line melting body that can be torn apart. The knife mold and the ultrasonic welding head are close to each other and resonate to generate heat. When they leave each other, the resonance disappears and the heat decreases, so as to realize the formation and temperature control of a linear high temperature zone.

The present invention provides coated films and packages formed from such films. In one aspect, a partially coated film comprises (a) a film having two outer surfaces, wherein a first outer surface is provided by a film layer that comprises from 70 to 100 percent by weight of a polyolefin having a density of 0.860 to 0.965 g/cm.sup.3; and (b) a coating on the first outer surface of the film comprising polyurethane, wherein the coating covers less than 25% of the surface area of the first outer surface of the film and wherein the coated portion of the film exhibits an Elmendorf tear in at least one of the machine direction or cross direction that is at least 20% less than the Elmendorf tear of the uncoated portion in the same direction, with the Elmendorf tear being measured in accordance with ASTM D1922.

The present invention provides a packaging material that allows for lesser adsorption of a medicinal component on the material, that can be processed into a packaging pouch without using an adhesive, and that has excellent tearability. Specifically, the present invention provides a packaging material including, on or above one or both surfaces of a substrate, a primer layer and a low-adsorption coating layer with a grammage of 0.5 to 20 g/m.sup.2 in this order, wherein the primer layer contains an acid-modified product of a block copolymer that contains a block A containing a structural unit derived from an aromatic vinyl compound, and a block B containing a structural unit derived from a conjugated diene compound and/or an acid-modified product of a hydrogenated product of the block copolymer; and the low-adsorption coating layer contains a cyclic polyolefin.

The present invention relates to a layered packaging film for fresh produce. The film provides a water vapour transmission rate of at least 30 g m.sup.−2 per day, and includes a polymer layer with a sealing temperature of 205° C. or less. The present invention also provides a comprising fresh produce enclosed by a packaging film, wherein the packaging film is sealed by an elongate seal extending along the underside of the package, and wherein the elongate seal has a sealing strength such that when the packaging film is lifted from the upper side of the fresh produce package the seal breaks permitting the packaging film to be removed from the fresh produce in a single lifting action.

Provided is a packaging bag in which the difficulty of tearing caused by temperature rising is resolved. The easy to open packaging bag for sealing a laminated film by heat sealing, wherein the laminated film includes an inner layer film, an intermediate layer film having an opening induction flaw formed thereon, and an outer layer film including a biaxially oriented film, and wherein a molecular orientation angle of the outer layer film is less than 49°. Also provided are a laminated film and a pouch having easy to open properties while maintaining excellent barrier properties. The laminated film is obtained by laminating (a) an outer layer film, (b) a barrier layer having an opening induction flaw, and (c) an inner layer film, and has a barrier ink covering the opening induction flaw in the barrier layer.

The present disclosure provides a process. The process includes (A) providing at least 6 film layers, each film layer being a pearlized biaxially oriented polypropylene; (B) applying a solvent-less adhesive at a coat weight of 2.0 g/m.sup.2 to 3.5 g/m.sup.2 between each film layer; and (C) forming a laminate, the laminate having a thickness of at least 300 μm. The solvent-less adhesive contains (i) a polyol component including at least one polyol selected from a polyester polyol, a polyether polyol, and combinations thereof; and (ii) an isocyanate component including an isocyanate prepolymer that is the reaction product of at least one isocyanate monomer and at least one polyol selected from a polyester polyol, a polyether polyol, and combinations thereof. The present disclosure also provides a laminate formed by said process.

Provided is an oxygen-absorbing packaging material which is used for adhesive patches or the like containing an easily oxidizable component and an oily component, and which has improved tearability, while maintaining good heat seal strength. The present invention relates to an easily tearable oxygen-absorbing packaging material which has a multilayer structure comprising an oxygen barrier layer, an oxygen absorption layer and a sealant film, and wherein: the sealant film is a multilayer resin film that comprises at least a core layer and an inner layer having heat sealability; and the core layer contains 20-40% by mass of a cyclic polyolefin resin and/or an acrylic resin and 60-80% by mass of a polyethylene terephthalate resin relative to the total mass of the core layer.

A gas-sensing pigment incorporated in a thin film indicator or tape that changes color upon exposure to hydrogen or hydrogen sulfide. The gas-sensing pigment is compounded together with a silicone polymer to produce a self-fusing silicone tape having a tensile strength of at least 700 psi, a tear resistance of at least 85 psi, and ultimate elongation of at least 300%. The gas-sending pigment includes chemochromic metal oxide particles of a tungsten oxide or a molybdenum oxide, and a catalyst having platinum, palladium, rhodium, nickel, or silver. The catalyst coating is applied to each metal oxide particle as nanoparticles of less than 30 nanometers in diameter, and the microparticles of chemochromic metal oxide material are less than 200 microns or 100 microns in diameter.