Soft asbestos-free sealing material
US5437920A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1994 |
| Grant date | Aug 1, 1995 |
| Priority date | — |
| Expiry date | Jan 6, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/699
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention relates to sealing materials free from asbestos or other inorganic fibrous substances in the form of papers, paperboards, cardboards or plates. The gasket compositions preferably comprise a mixture of non-fibrillated organic fibers having an elongation at break of < 5% (up to 200.degree. C.) and fibrillated P polyaramide fibers as well as, powdered graphite and an elastomeric resin binder. A new and improved process for making non-woven, planar sealing materials free from asbestos or other inorganic fibrous substances, is also provided. The reinforcement-forming and sheet-forming organic fibers, binders and fillers are homogenized in a mixer and the mixture is subsequently treated with heat and pressure to form the non-woven webs. The new asbestos-free sealing gaskets and materials may be used for technical or industrial applications such as secondary automobile gaskets, cylinder head gaskets, for seals or gaskets used in the construction of chemical plants and power plants, and for seals or gaskets used in the construction of heating systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.