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US 5,405,661 AGranted
Fire resistant panel
AssigneeThe Dow Chemical Company
InventorsPeter K. Kim, Peter E. Pierini, Ritchie A. Wessling
Life of this patent
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Abstract
A structural panel for a vehicle or building contains a substrate and a layer of flame resistant polybenzazole polymer. If the substrate is heat resistant, the panel can serve as a fire barrier. If the substrate is not heat resistant, the polybenzazole layer can still serve to delay ignition and contain any volatile gases and molten polymer that forms when the panel is subjected to heat.
Claims24
A structural panel for a vehicle or a building comprising:
- (1) a supporting structure in a size and shape that is suitable for use as a structural panel for a vehicle or building;
- and (2) a continuous layer of flame-resistent polybenzazole or polybenzothiazole polymer adhered to said supporting structure;
- wherein the polybenzazole or polybenzothiazole polymer contains AB-mer units, as represented by the formula:
- ##STR3## or AA/BB-mer units, as represented by the formula:
- ##STR4## or both, and each Z is independently an oxygen or a sulfur atom;
- each Ar represents an aromatic group;
- and each DM is independently a bond or a non-interfering divalent organic moiety.
4 more elements
A method to improve the flame-resistance of a polymer panel that is used in a vehicle or building, said method comprising the steps of:
- (1) applying to the panel a coating of dope that contains a flame-resistent polybenzoxazole or polybenzothiazole polymer and a solvent acid;
- (2) coagulating the polybenzoxazole or polybenzothiazole polymer by contact with a coagulant;
- and
- (3) washing the polybenzoxazole or polybenzothiazole polymer coating to remove a major portion of the solvent acid;
- wherein the polybenzazole or polybenzothiazole polymer contains AB-mer units, as represented by the formula:
- ##STR8## or AA/BB-mer units,as represented by the formula:
- ##STR9## or both, and each Z is independently an oxygen or a sulfur atom;
- each Ar represents an aromatic group;
- and each DM is independently a bond or a non-interfering divalent organic moiety.
6 more elements
Dependencies are inferred from the claim text.