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US 9,902,877 B2Granted
Separating film having a foamed structure
AssigneeInfiana Germany GmbH & Co. KG
InventorsHeinz Engelhard, Michael Fürst, Jürgen Panhans, Matthias Mauser
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Abstract
Separating film, comprising at least one layer(s) having a foamed structure of at least one thermoplastic polymer, at least one of the surfaces of the separating film being provided with a release layer (b) of at least one cured polysiloxane as an outer layer, the use thereof as a detachable protective and covering film, and roofing membrane provided with the separating film as a detachable protective and covering film.
Claims15
A release film comprising at least one layer (s) with a closed-cell foam structure of at least one thermoplastic polymer,
- where the closed-cell foam structure is formed of expanded, hollow thermoplastic microparticles, the expansion of which has been achieved by virtue of at least one volatile organic compound present in the cavity of the microparticles,
- where the diameter of the expanded, hollow thermoplastic microparticles is from 30 μm to 300 μm, and the average diameter of the expanded hollow thermoplastic microparticles is greater than the overall thickness of the release film, thereby providing the release film with a rough and uneven surface,
- where at least one of the surfaces of the release film is provided with a release layer (b) as external layer, formed of at least one crosslinked polysiloxane, and connected to said at least one layer (s) with an anchoring aid,
- where the melting point of the thermoplastic polymer of the layer (s) is lower than that of the thermoplastic polymer of which the hollow thermoplastic microparticles are formed.
1 more element
Dependencies are inferred from the claim text.