Flexible, asbestos-free gasket material

• US 4,529,663 A
• Filed: 04/19/1984
• Issued: 07/16/1985
• Est. Priority Date: 04/27/1983
• Status: Expired due to Term

• Current Assignee: T&N Materials Research Limited
• Original Assignee: T&N Materials Research Limited
• Inventors: Lancaster, Robert A., Hargreaves, Brian, McKenzie, Noel C.
• Primary Examiner(s): Schofer, Joseph L.
• Assistant Examiner(s): Teskin, Fred M.
• Application Number:
  US06/601,927
• Time in Patent Office: 453 Days
• Field of Search: 524/35, 524/538, 524/431, 524/443, 524/47, 524/445, 524/449, 524/456, 524/447, 524/492, 524/606, 106/DIG. 3, 106/DIG. 4, 106/204, 501/95, 428/237, 428/283, 428/454, 428/450, 428/463, 428/464, 277/227, 277/233, 277/234, 277/DIG. 6, 162/142, 162/164.1, 162/146, 162/181.6, 162/181.8
• US Class Current: 428/450
• CPC Class Codes: C09K 2003/1046 Water-absorbing materials
• CPC Class Codes: C09K 2200/0239 Oxides, hydroxides, carbonates
• CPC Class Codes: C09K 2200/0243 Silica-rich compounds, e.g. silicates, cement, glass
• CPC Class Codes: C09K 2200/0252 Clays
• CPC Class Codes: C09K 2200/0612 Butadiene-acrylonitrile rubber
• CPC Class Codes: C09K 2200/0695 Polyamide fibres
• CPC Class Codes: C09K 2200/0697 Cellulose fibres
• CPC Class Codes: C09K 3/1028 Fibres
• CPC Class Codes: D21H 13/26 Polyamides; Polyimides
• CPC Class Codes: D21H 13/40 vitreous, e.g. mineral wool, glass fibres
• CPC Class Codes: D21H 17/68 siliceous, e.g. clays
• CPC Class Codes: F16J 15/102 characterised by material
• CPC Class Codes: Y10S 277/936 Composite
• CPC Class Codes: Y10T 428/31699 Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31703 Next to cellulosic

Abstract

Non-asbestos flexible sheet material suitable for use in gaskets for the cylinder head of an internal combustion engine is made by dewatering on a water-permeable conveyor a layer of aqueous slurry and compressing and drying the dewatered layer, the aqueous slurry employed being one that contains the following ingredients in the following proportions by dry weight:

______________________________________                                    

ball clay 25-44% calcium silicate of high specific 15-40% surface area cellulose fibres 3-15% organic polymer binder 5-15% fibrillated poly (aromatic amide) 1-15% fibres ______________________________________

Claims

1. Non-asbestos flexible sheet material made by dewatering on a water-permeable conveyor a layer of aqueous slurry and compressing and drying the dewatered layer, and calendering the dried dewatered layer, the aqueous slurry employed being one that contains the following ingredients in the following proportions by dry weight:

space="preserve" listing-type="tabular">______________________________________ ball clay 25-44% calcium silicate of specific 15-40% surface area of at least 10 m.sup.2 /gram cellulose fibres 3-15% organic polymer binder 5-15% fibrillated poly(aromatic amide) fibres 1-15%. ______________________________________

2. Non-asbestos flexible sheet material according to claim 1, in which the slurry also contains 1-5% by dry weight of a wax.

3. Non-asbestos flexible sheet material according to claim 1, in which the slurry also contains 2-10% by dry weight of black iron oxide.

4. Non-asbestos flexible sheet material according to claim 1, in which the slurry also contains 1-8% by dry weight of a mineral wool.

5. Non-asbestos flexible sheet material according to claim 1, in which the slurry also contains 2-15% by dry weight of mica or chlorite.

6. A gasket comprising non-asbestos flexible sheet material according to claim 1, secured to a metal support.