Gasket composition having expanded microspheres
AssigneeArmstrong World Industries, Inc.
InventorsCharles M. Lindeman, Ralph D. Andrew
Life of this patent
Estimating the term…
Abstract
A gasket is described which contains microspheres which expand inside the gasket sheet material after the gasket sheet is formed. Such gaskets are especially useful to provide a seal against fluid leaks at significantly lower pressures due to the presence of the microspheres. Some microspheres can expand during use.
Claims34
A gasket material comprising a wet-laid gasket sheet which has good sealability, good compressive strength and good compression/ recover;
- further providing that the wet-laid gasket sheet includes fiber, expanded polymeric microspheres and a binder, wherein the fibers and expanded microspheres are held by the binder, and wherein the said expanded microspheres inflated inside the wet-laid sheet after it was formed.
A gasket material comprising:
- a wet-laid gasket sheet which has good sealability, good compressive strength and good compression/recovery further providing that the wet-laid gasket sheet includes fiber;
- unexpanded, expandable polymeric microspheres;
- and a binder, wherein the fibers and microspheres are held by the binder, and wherein the said microspheres will expand in the presence of an effective amount of heat to give internal densification.
A gasket comprising a mixture which includes fiber, expanded polymeric microspheres, and a binder, wherein the mixture is a gasket sheet having good sealability, good compression/recovery, and good compressive strength further providing that the polymeric microspheres expanded, in the sheet to cause internal densification.
Dependencies are inferred from the claim text.