Sheet-like structures capable of intumescence, their production

• US 5,258,216 A
• Filed: 02/25/1993
• Issued: 11/02/1993
• Est. Priority Date: 12/22/1990
• Status: Expired due to Fees

• Current Assignee: Bayer AG
• Original Assignee: Bayer AG
• Inventors: von Bonin, Wulf, von Gizycki, Ulrich
• Primary Examiner(s): Lesmes, George F.
• Assistant Examiner(s): SHELBORNE, KATHRYNE E
• Application Number:
  US08/023,461
• Time in Patent Office: 250 Days
• Field of Search: 428/102, 428/234, 428/240, 428/241, 428/242, 428/244, 428/298, 428/313.3, 428/313.7, 428/313.9, 523/179
• US Class Current: 428/102
• CPC Class Codes: B32B 5/30 one layer being formed of particles, e.g. chips, granules, powder
• CPC Class Codes: Y10T 428/24033 including stitching and discrete fastener[s], coating or bond
• CPC Class Codes: Y10T 428/249971 Preformed hollow element-containing
• CPC Class Codes: Y10T 428/249973 Mineral element
• CPC Class Codes: Y10T 428/249974 Metal- or silicon-containing element
• CPC Class Codes: Y10T 442/662 Needled

Abstract

New sheet-like structures which are capable of intumescence contain a layer of granular intumescence material between two textile sheet-like structures which are stitched or sewn to one another.

Claims

1. A flexible sheet-like structure comprising

a) a first textile sheet,

b) a layer of expandable graphite on said first sheet,

c) a second textile sheet on said layer of expandable graphite, and

d) stitching extending from said first to said second sheet, thereby locking the layer of expandable graphite into the structure.