Support web for roofing membranes

• US 5,130,178 A
• Filed: 03/12/1991
• Issued: 07/14/1992
• Est. Priority Date: 03/14/1990
• Status: Expired due to Term

• Current Assignee: Johns Manville International, Inc. (Berkshire Hathaway Incorporated)
• Original Assignee: Hoechst Aktiengesellschaft (Sanofi )
• Inventors: Wagner, Hans, Schops, Michael, Kaulich, Franz, Zerfass, Karl-Christian, Weiter, Bertrand C.
• Primary Examiner(s): CANNON, JAMES
• Application Number:
  US07/667,888
• Time in Patent Office: 490 Days
• Field of Search: 156/62.4, 156/167, 156/181, 156/308.2, 428/198, 428/296, 428/297
• US Class Current: 428/198
• CPC Class Codes: D04H 3/011 Polyesters
• CPC Class Codes: D04H 3/14 with bonds between thermoplastic yarns or filaments produced by welding
• CPC Class Codes: D04H 3/153 Mixed yarns or filaments
• CPC Class Codes: D04H 3/16 with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion
• CPC Class Codes: D06N 5/00 Roofing materials comprising a fibrous web coated with bitumen or another polymer, e.g. pitch compositions of bituminous materials C08L95/00, roof covering E04D5/00, roofing underlays E04D12/002
• CPC Class Codes: Y10T 428/24355 Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
• CPC Class Codes: Y10T 428/24826 Spot bonds connect components
• CPC Class Codes: Y10T 442/681 Spun-bonded nonwoven fabric

Abstract

There is described a support web for roofing membranes which comprises a spunbonded made of polyester filaments. The spunbonded has a basis weight of from 50 to 100 g/m² coupled with a filament denier of from 1 to 8 dtex and has been consolidated with a fusible binder. This produces a high tear propagation resistance and nail pullout strength and also good dimensional stability at high temperatures. The spunbonded support web is therefore particularly suitable for bitumenized roofing membranes.

Claims

1. A support web for roofing membranes which comprises a spunbonded web of polyethylene terephthalate filaments, said spun-bonded web having a basis weight of from 50 to 100 g/m² coupled with a filament denier of from 1 to 8 dtex and having been consolidated with a fusible binder in the form of binder filaments.

2. The support web of claim 1, wherein the basis weight of the spunbonded web is from 70 to 90 g/m².

3. The support web of claim 1, wherein the filament denier of the spunbonded is from 2 to 5 dtex.

4. The support web of claim 1,

wherein the fusible binder, filaments comprise a polymer having a melting point which is lower than the melting point of the polyethylene terephthalate load-carrying filaments.

5. The support web of claim 4, wherein the melting point of the fusible binder filaments is 10°

C., preferably, 30°

C., below the melting point of the polyethylene terephthalate load-carrying filaments.

6. The support web of claim 4, wherein the fusible binder filaments comprise polybutylene terephthalate or a modified polyester having an appropriately reduced melting point.

7. The support web of claim 1,

wherein the content of binder filaments is from 5 to 25% by weight.

8. The support web of claim 4, wherein the content of binder filaments is from 10 to 15% by weight.

9. A roofing membrane comprising a support web as claimed in claim 1, wherein the support web has been impregnated or coated with bitumen.

10. A process for manufacturing the support web of claim 1 by combining a fusible binder fiber with the polyester filaments and consolidating the web by heat treatment.

11. The process of claim 10, wherein the consolidation is effected by means of a calender (preconsolidation) and subsequent further heat treatment.