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Multilayered sheet, process for prodn. thereof and use thereof
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A multi-layer film and outer layer technology, applied in chemical instruments and methods, layered products, thin material processing, etc.
Inactive Publication Date: 2004-08-11
KOBUSCH SENGEWALD
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Abstract
Description
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Problems solved by technology
However, this known multilayer film needs to be improved in terms of transparency, flexibility and adhesion between the layers forming the multilayer film, as well as the resulting peeling process, ie the layers will separate from each other
Method used
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Embodiment 1
[0059] Multilayer films based on polypropylene:
[0060] Outer layer:
[0061] DAPLEN KF 201 (available from PCD / Linz, is a polypropylene homopolymer)
[0062] Polypropylene homopolymer with a thickness of 15 μm
[0063] Connection layer:
[0064] CAWITON MED PR 3530 (available from WITTENBURG / Bussum-(Netherlands), a blend of polypropylene polymer, styrene-ethylene / butylene-styrene triblock copolymer and plasticizer)
[0065] Polypropylene composite with a thickness of 95 μm, consisting of
[0070] CAWITON MED PR 3663 (available from WITTENBURG / Bussum-(Netherlands), a blend of polypropylene polymer and styrene-ethylene / butylene-styrene triblock copolymer)
[0071] Polypropylene composite with a thickness of 40 μ, consisting of
[0072] a) Polypropylene homopolymer
[0073] b) SEBS as TPE-S
[0074] The total thickness of the multilayer films extruded in a wa...
Embodiment 2
[0077] Multilayer films based on polypropylene:
[0078] Outer layer:
[0079] DAPLEN KF 201 (available from PCD / Linz)
[0080] Polypropylene homopolymer with a thickness of 20 μm
[0081] Connection layer:
[0082] CAWITON MED PR 3530 (available from WITTENBURG / Bussum-(Netherlands))
[0083] Polypropylene composite with a thickness of 125 μm, consisting of
[0105] CAWITON MED PR 3663 (available from WITTENBURG / Bussum-(Netherlands))
[0106] Polypropylene composite with a thickness of 70 μm, consisting of
[0107] a) Polypropylene homopolymer
[0108] b) SEBS as TPE-S
[0109] The total thickness of the multilayer films extruded in a water bath was 250 μm.
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Abstract
The invention relates to a multilayered sheet with an outer polymer layer, a central polymer layer and a heat-sealable inner polymer layer. Said sheet has at least one connection layer consisting of a polypropylene compound and / or a blend of polypropylene homopolymer and / or copolymer, and at least one thermoplasticelastomer and / or polyisobutylene and an inner layer consisting of a polypropylene compound consisting of a polypropylene homopolymer and / or copolymer with at least one thermoplasticelastomer. The invention also relates to a process for producing said multilayered sheet during which at least two layers of the multilayered sheet are co-extruded, and also to the use of said sheet for the packaging of materials such as food or medical fluids or solutions such as saline, amino acid solutions, dialysis solutions, blood substitute solutions and blood.
Description
technical field [0001] The present invention relates to a multilayer film having a polymeric outer layer, a polymeric tie layer and a heat-sealable polymeric inner layer, a process for its production and its use. Background technique [0002] Such multilayer films, preferably heat-sealable multilayer films, have long been used for the production of liquid-tight, in particular water vapor-tight, bags. They are used especially for the primary packaging of liquid medicines and solution bags. Can also be used as a hydrophobic bag. In most cases, as long as they are liquid-tight they will suffice. [0003] In certain cases, especially when used as primary packaging for oxygen-sensitive materials, it may also be desirable to have corresponding gas barrier properties. This is the case, for example, when used as packaging for amino acid solutions or when the ingress or release of CO2 can lead to unfavorable pH changes or when oxygen ingress the substance oxidizes and thus changes...
Claims
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Application Information
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