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US 2008/0167412 A1Published application
Fire-Retardant Low-Density Epoxy Composition
Assignee3M Innovative Properties Company
InventorsSohaib Elgimiabi, Alain H. Lamon
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Assignee3M Innovative Properties Company
InventorsSohaib Elgimiabi, Alain H. Lamon
Estimating the term…
The present invention relates to a curable precursor of a fire-retardant, low-density and essentially halogen-free epoxy composition comprising (i) 10 to 70 weight percent of at least one organic epoxide compound with an epoxide functionality of at least one, (ii) 1 to 55 weight percent of at least one epoxide hardener, (iii) 5 to 50 weight percent of an essentially halogen-free fire-retardant system that includes a mixture of: (1) at least one compound selected from the group comprising alkaline earth metal hydroxides and aluminium group hydroxides, and (2) at least one phosphorous-containing material, (iv) 10 to 60 weight percent of a filler system capable of reducing the density of the precursor that includes a mixture of (1) at least one low-density inorganic filler having a density of between 0.1 to 0.5 g cm−3?, (2) at least one low-density organic filler having a density of between 0.01 to 0.30 g/cm−3? and being compressible.
Curable precursor of a fire-retardant, low-density and essentially halogen-free epoxy composition comprising
Precursor according to any of the preceding claims wherein the at least one inorganic filler (1) of the filler system is selected from a group comprising hollow inorganic microspheres.
Precursor according to any of the preceding claims wherein the at least one organic filler (2) of the filler system is selected from the group comprising pre-expanded polymeric microspheres.
Precursor according to any of the preceding claims wherein the at least organic epoxide with a functionality of at least one is selected from the group comprising alkylene oxides, alkenyl oxides, glycidyl esters, glycidyl ethers, epoxy novolacs, copolymers of acrylic acid esters of glycol and copolymerizable vinyl compounds and polyurethane polyepoxides.
Precursor according to any of the preceding claims wherein the at least one epoxide hardener is selected from the group comprising amines, acid anhydrides, boron complexes, guanidines, dicyandiamide.
Precursor according to any of the preceding claims wherein component (1) of the fire-retardant system comprises aluminium hydroxide.
Precursor according to any of the preceding claims wherein the phosphorous-containing material of component (2) of the fire-retardant system comprises encapsulated red phosphorous.
Precursor according to any of the preceding claims being extrudable at an extrusion rate of at least 60 g/min at 23° C. by using air driving SEMCO cartridge with a nozzle having an aperture of 5.6 mm under an air pressure of 5 bar.
Dependencies are inferred from the claim text.