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AssigneeMinnesota Mining and Manufacturing Company
InventorWalton W. Welna
Estimating the term…
A flexible, fire-retardant, intumescent composition comprising: a) an intumescent material; b) an effective amount of a stabilizing agent; and c) an organic binder throughout which the intumescent material and stabilizing agent are dispersed, the elastomeric binder being at least partially crosslinked, wherein the stabilizing agent consists essentially of a compound selected from the group consisting of compounds within general formula I ##STR1## wherein R.sup.1 -R.sup.4 inclusive are independently selected from the group consisting of hydrogen and alkyl groups having from 1 to about 5 carbon atoms, with the provisos that: i) either both of R.sup.1 and R.sup.2, or both R.sup.3 and R.sup.4 are alkyl groups having from 1 to about 5 carbon atoms; and ii) the stabilizing agent has a melting point ranging from about 105.degree. C. to about 125.degree. C. The stabilizing agent is present in an amount sufficient to render the composite expansion and compression set properties of the composition after prolonged exposure to oxidative conditions substantially unchanged.
A flexible, fire-retardant, intumescent composition comprising:
A flexible, fire-retardant, intumescent composition comprising:
A method of increasing the useful life of a flexible, fire-retardant, intumescent composition comprised of an organic binder which is at least partially crosslinked, an intumescent material, and various optional ingredients, the method comprising formulating the composition with an effective amount of a stabilizing agent consisting essentially of one or more compounds selected from the group consisting of compounds within general formula I ##STR5## wherein R.sup.1 -R.sup.4 inclusive are independently selected from the group consisting of hydrogen and alkyl groups having from 1 to about 5 carbon atoms, with the provisos that:
Dependencies are inferred from the claim text.