摘要:
A biaxially oriented heat sealable multilayer film structure, suited for use in high altitude applications, which comprises:(a) a core substrate having two surfaces, comprising i) a layer of homopolymer polyolefin and ii) a layer of block copolymer of ethylene and propylene having a MFR of 1 to 10, adjacent to at least one side of i);(b) a polymeric heat sealable layer on one surface of said core substrate, said heat sealable layer comprising a polymeric material selected from the group consisting of a terpolymer of ethylene, propylene and butene-1, a random copolymer of ethylene and propylene, a random copolymer of propylene and butene-1, and blends thereof; and optionally,(c) a high density polyethylene (HDPE) layer adjacent to the other surface of said core substrate (a).
摘要:
A sealable film comprises: (a) an inner layer comprising an olefin polymer; (b) a sealing layer; and (c) a separable layer positioned between the inner layer and the sealing layer, the separable layer comprising (1) ethylene-propylene block copolymer or (2) a blend of polyethylene and another olefin which is incompatible with the polyethylene, specifically either (i) polypropylene homopolymer or (ii) ethylene-propylene block copolymer. Methods of making the sealable film are described.
摘要:
A multi-layer film includes a base layer comprising a polyolefin and at least one additional layer comprising a metallocene-catalyzed syndiotactic polypropylene, wherein the base layer and the at least one additional layer comprising a metallocene-catalyzed syndiotactic polypropylene are not suitable for use as a heat sealable film. The multi-layer films of the present invention have improved metallizable surfaces and the metallized films exhibit excellent gas (e.g., oxygen and water vapor) barrier properties, as well as good pick off, optical properties (optical density, haze, and gloss), and coefficient of friction (COF).
摘要:
An oriented film structure of improved water vapor transmission rate is prepared from an extruded and stretched mixture of (1) high crystallinity polypropylene (HCPP) having intermolecular stereoregularity greater than 93% and (2) a moisture barrier improving amount of polyterpene resin.
摘要:
The present invention is directed to a biaxially oriented multi-layer film which comprises: (a) a core layer comprising a syndiotactic propylene homopolymer; and (b) at least one additional layer adjacent to the core layer comprising a polymer which is an ethylene or a propylene homopolymer, ethylene copolymer or terpolymer containing comonomers of propylene and/or butene-1. Optionally, there can be a skin layer applied to the exposed surface of the outer layer. The skin layer and/or the at least one additional layer is a polyolefin selected from the group consisting of isotactic polypropylene, polyethylene, ethylene-propylene random copolymer, ethylene-propylene block copolymer or ethylene-propylene-butene-1 terpolymer.
摘要:
A sealable film comprising a core layer comprising an olefin polymer wherein the core layer comprises the interior of the film; a separable layer exterior to the core layer, wherein the separable layer comprises a material or blend selected from the group consisting of impact copolymers; thermoplastic polyolefins; blends of impact copolymers and LLDPE's; blends of two or more incompatible polymers; and mixtures thereof; an optic improving layer exterior to the core layer and the separable layer, wherein the optic improving layer comprises a polymer having at least one of modulus, hardness, and/or beam strength being higher than the material of the separable layer; and a sealing layer exterior to the core layer, the separable layer, and the optic improving layer, wherein the sealing layer comprises a polymer.
摘要:
A uniaxially heat-shrinkable, biaxially oriented, multilayer film having a polypropylene-containing core layer comprising at least 70 wt. % of said multilayer film and optionally, at least one polyolefin-containing skin layer adjacent said core layer, is prepared by biaxially orienting a coextrudate and therefore orienting said coextrudate by stretching 10 to 40 % in the machine direction. The core layer contains isotactic polypropylene and a sufficient amount of syndiotactic polypropylene to inhibit uniaxial heat shrinkage at temperature below about 50.degree. C. The skin layer can be selected from the group consisting of polypropylene, ethylene-propylene copolymer, polyethylene, and ethylene-propylene-butylene terpolymer.
摘要:
The present invention is a high barrier multilayer film particularly suitable for packaging. The high barrier multilayer film is a film including (a) a core substrate layer having an isotactic polypropylene produced from Ziegler-Natta catalysts, and (b) an adjacent layer on at least one surface of the core substrate layer, wherein the adjacent layer (b) comprises an isotactic polypropylene produced from metallocene catalysts; or the high barrier multilayer film includes (a′) a core substrate layer having an isotactic polypropylene produced from metallocene catalysts, and (b′) an adjacent layer on at east one surface of the core substrate layer, wherein the adjacent layer (b′) comprises an isotactic polypropylene produced from Ziegler-Natta catalysts.
摘要:
The invention is directed to an oriented multi-layer film which comprises a voided layer and at least one non-voided layer on at least one surface of the voided layer. In one embodiment, the voided layer comprises a Ziegler-Natta or metallocene-catalyzed substantially isotactic propylene polymer in a polymer matrix with a cavitation initiator. In a second embodiment, the non-voided layer comprises a Ziegler-Natta or metallocene-catalyzed substantially isotactic polypropylene polymer. In a third embodiment, both the voided core layer and at least one non-voided layer comprise a metallocene-catalyzed substantially isotactic polypropylene polymer.
摘要:
A sealable film comprises: (a) an inner layer comprising an olefin polymer; (b) a sealing layer; and (c) a separable layer positioned between the inner layer and the sealing layer, the separable layer comprising (1) ethylene-propylene block copolymer or (2) a blend of polyethylene and another olefin which is incompatible with the polyethylene, specifically either (i) polypropylene homopolymer or (ii) ethylene-propylene block copolymer. Methods of making the sealable film are described.