# US 8,771,827 B2 · Film for construction and film combination > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,771,827 B2 - Document ID: US8771827B2 - Status: Granted - Kind: B2 - Application number: 12/679,392 - Filed: 2008-09-24 - Published: 2010-09-02 - Granted: 2014-07-08 - Earliest claimed: 2007-09-26 - Assignees: Ewald Dörken AG - Applicants: Jörn Schröer - Inventors: Jörn Schröer - Web page: https://patentgrep.com/patent/US8771827B2 ## CPC - E04B 7/00: Roofs; Roof construction with regard to insulation (structures for roofs as well as for floors E04B5/00; ceilings E04B9/00; greenhouses A01G9/14; large containers having floating covers B65D88/34; roof trusses, truss-like structures, joists E04C3/02; roof coverings E04D) - B32B 5/022: {Non-woven fabric} - B32B 27/06: as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)} - B32B 27/12: next to a fibrous or filamentary layer - B32B 27/36: comprising polyesters - E04B 1/665: {Sheets or foils impervious to water and water vapor} - B32B 2262/065: Lignocellulosic fibres, e.g. jute, sisal, hemp, flax, bamboo - B32B 2307/7163: Biodegradable - B32B 2307/724: Permeability to gases, adsorption - B32B 2419/00: Buildings or parts thereof - E04B 1/625: {Sheets or foils allowing passage of water vapor but impervious to liquid water; house wraps} - Y10T 428/24942: including components having same physical characteristic in differing degree - Y10T 428/249921: Web or sheet containing structurally defined element or component - Y10T 428/249953: Composite having voids in a component [e.g., porous, cellular, etc.] - Y10T 428/254: Polymeric or resinous material - Y10T 428/31504: Composite [nonstructural laminate] - Y10T 428/31551: Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.] - Y10T 428/31786: Of polyester [e.g., alkyd, etc.] - Y10T 428/31971: Of carbohydrate - Y10T 442/2213: Coating or impregnation is specified as weather proof, water vapor resistant, or moisture resistant - Y10T 442/60: Nonwoven fabric [i.e., nonwoven strand or fiber material] - E04B: GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS (border constructions of opening in walls, floors or ceilings E06B1/00; {electromagnetic shielding H05K9/0001}) - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The film combination according to claim 1, wherein the biodegradable polymer is disintegrateable upon aerobic composting after a composting interval of more than 12 weeks and at most 80 weeks to an extent that a maximum 10% of the original dry weight of the biodegradable polymer can be found in a screen fraction of the composted material greater than 2 mm. ### Claim 3 (depends on 2) The film combination as claimed in claim 2, wherein the composting interval is at most 60 weeks. ### Claim 4 (depends on 2) The film combination as claimed in claim 2, wherein the composting interval is at most 18 weeks. ### Claim 5 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. ### Claim 6 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. ### Claim 7 (depends on 1) The film combination as claimed in claim 1, wherein the functional layer has tearing force durability of at least 10 to 50 N/5 cm for at least 5 years of use in construction. ### Claim 8 (depends on 1) The film combination as claimed in claim 1, wherein the proportion of the biodegradable material in the functional layer is greater than 95% by weight. ### Claim 9 (depends on 1) The film combination as claimed in claim 1, wherein the functional layer has a minimum elongation of according to DIN EN 12311 that is greater than 5%. ### Claim 10 (depends on 1) The film combination as claimed in claim 1, wherein the functional layer has a minimum elongation of according to DIN EN 12311 that is greater than 100%. ### Claim 11 (depends on 10) The film combination as claimed in claim 10, wherein the functional layer has a maximum elongation according to DIN 12311 that is less than 1000%. ### Claim 12 (depends on 9) The film combination as claimed in claim 9, wherein the functional layer has a maximum elongation according to DIN 12311 that is less than 200%. ### Claim 13 (depends on 1) A The film combination as claimed in claim 1, wherein the functional layer has a water absorbance according to DIN 53714 at 50% relative humidity and saturation of 0.45 to 40%. ### Claim 14 (depends on 1) The film combination as claimed in claim 1, wherein the functional layer has a thickness of 1 to 1000 microns. ### Claim 15 (depends on 1) The film combination as claimed in claim 1, wherein the functional layer has a thickness of 5 to 100 microns. ### Claim 16 (depends on 1) The film combination as claimed in claim 1, wherein the functional layer has weight per unit area of 1 to 1000 g/m2. ### Claim 17 (depends on 1) The film combination as claimed in claim 1, wherein the functional layer has a tearing force of 10 to 1500 N/5 cm. ### Claim 18 (depends on 1) The film combination as claimed in claim 1, wherein the functional layer is watertight for a static water column of at least 10 cm. ### Claim 19 (depends on 1) The film combination as claimed in claim 1, wherein the functional layer is formed of several layers. ### Claim 20 (depends on 1) The film combination as claimed in claim 1, wherein the carrier or reinforcing layer is at least one of a textile layer, a fabric layer, and a nonwoven layer. ### Claim 21 (depends on 1) The film combination as claimed in claim 1, wherein the functional layer is bonded to the additional layer.