Film for construction and film combination
AssigneeEwald Dörken AG
InventorJörn Schröer
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Abstract
A film (1) for construction with at least one functional layer (2) and optionally at least one other layer, especially a carrier layer and/or reinforcing layer (3), the functional layer (2) having a water vapor diffusion resistance (sd value) that is dependent on the ambient humidity. The functional layer (2) has at least one material (4) that can be obtained from a renewable raw material, especially at least one polymer based on a renewable raw material.
Claims21
A film combination for construction, comprising at least one functional layer consisting of a biodegradable polymer selected from the group consisting of a biodegradable polyester, a biodegradable polyhydroxyalkanoate, a biodegradable polylactide, a biodegradable polyester urethane and a biodegradable polysaccharide, the functional layer having a water vapor diffusion resistance (sd value) that is dependent on ambient humidity, and at least one carrier or reinforcing layer, further comprising at least one additional layer that has a water vapor permeability that is less than the water vapor permeability of the functional layer.
The film combination as claimed in 1, wherein the functional layer has a water vapor permeability duration of at least 30% of the water vapor permeability in the new state of the functional layer for at least 5 years in use in construction.
The film combination as claimed in 1, wherein the functional layer has a water vapor permeability durability of at least 50% of the water vapor permeability in the new state of the functional layer for at least 20 years in use in construction.
Dependencies are inferred from the claim text.