Sheet material containing exfoliated vermiculite

• US 4,271,228 A
• Filed: 02/04/1980
• Issued: 06/02/1981
• Est. Priority Date: 02/04/1980
• Status: Expired due to Term

• Current Assignee: Hollingsworth & Vose Company
• Original Assignee: Hollingsworth & Vose Company
• Inventors: Foster, Richard P., Brodin, Gregory C.
• Primary Examiner(s): Robinson, Ellis P.
• Application Number:
  US06/117,986
• Time in Patent Office: 484 Days
• Field of Search: 428/288, 428/323, 428/324, 428/328, 428/325, 428/404, 428/258, 428/241, 428/920, 162/181 C, 277/235 B, 277/22, 277/166
• US Class Current: 442/322
• CPC Class Codes: C04B 14/204 expanded
• CPC Class Codes: C04B 16/06 fibrous
• CPC Class Codes: C04B 18/24 Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper , cork
• CPC Class Codes: C04B 26/02 Macromolecular compounds
• CPC Class Codes: F16J 15/065 fire resistant
• CPC Class Codes: F16J 15/102 characterised by material
• CPC Class Codes: F28F 3/10 Arrangements for sealing the margins
• CPC Class Codes: Y02W 30/91 Use of waste materials as fillers for mortars or concrete
• CPC Class Codes: Y10S 277/919 Seal including electrical feature
• CPC Class Codes: Y10S 277/936 Composite
• CPC Class Codes: Y10S 428/92 Fire or heat protection feature
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/251 Mica
• CPC Class Codes: Y10T 428/252 Glass or ceramic [i.e., fired or glazed clay, cement, etc.] [porcelain, quartz, etc.]
• CPC Class Codes: Y10T 428/256 Heavy metal or aluminum or compound thereof
• CPC Class Codes: Y10T 442/53 Including particulate material other than fiber

Abstract

Flexible sheet material adapted for use as heat resistant gaskets, heat insulation, eletrical insulation and support media in the form of a bonded fibrous web containing vermiculite, organic fibers and binder material.

Claims

1. A sheet material adapted for use as heat resistant gaskets, heat insulation, electrical insulation, and supporting media for dehumidifiers and heat exchangers, said material being in the form of a fibrous web comprising organic fiber, organic binder, and a blend of completely exfoliated vermiculite free from asphalt with another inorganic asbestos-free particulate filler, said blend having a particle size to pass a No. 80 screen, the amount of said fiber being from 1 to 30% by weight and the amount of said blend being from 70 to 99% by weight, the amount of binder being from 3 to 30% by weight, all based on the total weight of fiber and blend, and the amount of vermiculite being from 25 to 70% by weight of said blend, said sheet material having a density of 0.64 to 1.92 g per cc, a tensile strength of at least 500 psi, a compression of 7 to 50% and a recovery of 20 to 70% at 1000 psi, a sealability of 30 cc/hr maximum at 500 psi, and a stress relaxation of 50% maximum at 212°

F.

2. A sheet material as claimed in claim 1 in which the amount of vermiculite is from 25 to 35% by weight of said blend.

3. A sheet material as claimed in claims 1 or 2 in which the amount of said organic fiber is from 5 to 20% by weight and the amount of said binder is from 5 to 20% by weight.

4. A sheet material as claimed in claim 2 in which the amount of said organic fiber is from 5 to 20% by weight and the amount of said binder is from 5 to 20% by weight, said sheet material having a sealability from 5 cc/hr to 30 cc/hr at 500 psi, and a stress relaxation from 5 to 40%, suitable for use as a heat resistant gasket.

5. A sheet material as claimed in claim 4 having a crush resistance from 5 to 70%.