Flame retardant polyolefin pallets and flame retardant master batch for their production
AssigneeRehrig Pacific Company
InventorsTrenton M. Overholt, Justin M. Smyers
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Abstract
Polyolefin-based pallets capable of passing standard pallet flammability tests are prepared by molding the pallet or one or more subassemblies thereof, of a polyolefin molding resin containing a flame retardant package containing magnesium hydroxide, and optionally alumina trihydrate, and zinc borate. The flame retardants may be supplied as a master batch at a concentration higher than that desired in the pallet or subassembly, in a polyolefin-compatible polymer, and result in pallets having a significantly lower heat release rate.
Claims15
A flame retardant injection molded polyolefin pallet which meets the flammability requirements of U.L. 2335, comprising one or more subassemblies, at least one flame retardant subassembly containing a pulverulent flame retardant package consisting essentially of from 8 to 35 weight percent of magnesium hydroxide based on the weight of said flame retardant subassembly, wherein when reinforcing fibers are present they consist of glass fibers.
A flame retardant polyolefin pallet comprising one or more subassemblies, at least one flame retardant subassembly consisting essentially of polyolefin(s), magnesium hydroxide in an amount of 8-25% based on the total weight of the flame retardant subassembly, optionally one or more inorganic fillers, optionally a reinforcement consisting of glass fibers, optionally one or more polymers other than polyolefins, and optionally further flame retardants.
Dependencies are inferred from the claim text.