Compressible non-asbestos high-temperature sheet material usable for gaskets

• US 4,786,670 A
• Filed: 01/09/1987
• Issued: 11/22/1988
• Est. Priority Date: 01/09/1987
• Status: Expired due to Fees

• Current Assignee: Lydall Incorporated
• Original Assignee: Lydall Incorporated
• Inventors: Tracy, Douglas, Major, Frank W.
• Primary Examiner(s): Foelak, Morton
• Assistant Examiner(s): Nutter, Nathan M.
• Application Number:
  US07/001,704
• Time in Patent Office: 683 Days
• Field of Search: 524/34, 524/35, 524/401, 524/436, 524/443, 524/445, 524/448, 524/449, 524/492, 524/494, 277/235 B, 277/DIG. 6, 428/131, 428/171, 428/233, 428/241, 428/242, 428/243
• US Class Current: 524/34
• CPC Class Codes: C04B 12/04 Alkali metal or ammonium silicate cements ; Alkyl silicate cements; Silica sol cements; Soluble silicate cements alkali metal silicates per se, their preparation C01B33/32; ammonium silicates per se, their preparation C01C1/00
• CPC Class Codes: C04B 14/08 Diatomaceous earth
• CPC Class Codes: C04B 14/10 Clay sepiolite C04B14/042; grog C04B18/025
• CPC Class Codes: C04B 14/20 Mica; Vermiculite mechanical splitting B28D
• CPC Class Codes: C04B 14/42 Glass
• CPC Class Codes: C04B 14/46 Rock wool ; Ceramic or silicate fibres C04B14/40, C04B14/42 take precedence
• CPC Class Codes: C04B 16/0691 Polyamides; Polyaramides
• 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 2111/28 Fire resistance, i.e. materials resistant to accidental fires or high temperatures
• CPC Class Codes: C04B 24/26 obtained by reactions only involving carbon-to-carbon unsaturated bonds C04B24/243 takes precedence
• CPC Class Codes: C04B 30/02 containing fibrous materials
• CPC Class Codes: C04B 40/006 involving the elimination of excess water from the mixture
• CPC Class Codes: C08K 13/04 Ingredients characterised by their shape and organic or inorganic ingredients
• CPC Class Codes: C08K 7/04 inorganic
• CPC Class Codes: C08L 21/00 Compositions of unspecified rubbers
• CPC Class Codes: D04H 1/4209 Inorganic fibres
• CPC Class Codes: D04H 1/4218 Glass fibres
• CPC Class Codes: D04H 1/425 Cellulose series
• CPC Class Codes: D04H 1/4342 Aromatic polyamides
• CPC Class Codes: D04H 1/43835 Mixed fibres, e.g. at least two chemically different fibres or fibre blends
• CPC Class Codes: D21H 13/40 : vitreous, e.g. mineral wool, glass fibres
• CPC Class Codes: F16J 15/102 : characterised by material
• CPC Class Codes: Y02W 30/91 : Use of waste materials as fillers for mortars or concrete
• CPC Class Codes: Y10S 277/936 : Composite
• CPC Class Codes: Y10T 428/24273 : including aperture
• CPC Class Codes: Y10T 428/24603 : Fiber containing component
• CPC Class Codes: Y10T 442/697 : Containing at least two chemically different strand or fiber materials

Abstract

A non-asbestos compressible sheet material usable for high-temperature gaskets preferably containing 10-50% by weight of an inorganic fibrous material, 10-90% by weight of an inorganic filler material, 4-30% by weight of an organic elastomeric binder, 2-10% by weight of an inorganic silicate binder and 1.0-10% of an organic fibrous material. The sheet material of the present invention may be manufactured on standard paper-making machinery.

Claims

1. A compressible non-asbestos sheet material usable for high temperature gaskets, said material comprising:

inorganic fibrous material,

inorganic filler material,

organic fibrous material, and

a dual binder system, said dual binder system consisting of an organic binder material and an inorganic binder material.

2. The compressible non-asbestos high temperature gasket sheet material of claim 1 wherein said organic binder material is an organic elastomeric binder.

3. The compressible non-asbestos high temperature gasket sheet material of claim 1 wherein said inorganic binder material is selected from the group consisting of silicates and colloidal silica.

4. The compressible non-asbestos high temperature gasket sheet material of claim 3 wherein said inorganic binder material is sodium silicate.

5. The compressible non-asbestos high temperature gasket sheet material of claim 1 comprising:

10-50% by weight of inorganic fibrous material,

10-90% by weight of inorganic filler material,

4-30% by weight of an organic material binder,

2-10% by weight of an inorganic material binder,

1-10% by weight of organic fibrous material.

6. The compressible non-asbestos high temperature gasket sheet material of claim 1, wherein said inorganic fibrous material is selected from the group consisting of mineral wool, ceramic fiber, glass fiber and mixtures thereof.

7. The compressible non-asbestos high temperature gasket sheet material of claim 1, wherein said inorganic filler material is selected from the group consisting of diatomaceous earth, clay, mica, vermiculite, barytes, and mixtures thereof.

8. The compressible non-asbestos high temperature gasket sheet material of claim 1, wherein said elastomeric organic binder is selected from the group consisting of isoprene rubber, styrene-butadiene rubber, nitrile rubber, chloroprene rubber, silicone rubber, acrylic rubber, fluorinated resins and mixtures thereof.

9. The compressible non-asbestos high temperature gasket sheet material of claim 1, wherein said elastomeric organic binder is in latex form.

10. The compressible high temperature non-asbestos gasket sheet material of claim 1, wherein said organic fibrous material is selected from a group consisting of cellulosic fibers, synthetic fibers, and mixtures thereof.

11. The compressible high temperature non-asbestos gasket sheet material of claim 10, wherein said synthetic fibers are aramid fibers.

12. The compressible non-asbestos high temperature gasket sheet material of claim 1 comprising:

18-31% by weight of inorganic fibrous material,

27-50% by weight of inorganic filler material,

5-19% by weight of an organic material binder,

3-8% by weight of an inorganic material binder,

1.0-6.0% by weight of an organic fibrous material.