Flame retardant polyolefin pallets and flame retardant master batch for their production
AssigneeRehig 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.
Claims19
A flame retardant molded polyolefin pallet comprising one or more subassemblies, at least one subassembly comprising a polyolefin containing a flame retardant package comprising as flame retardant components
- a) 8-35% magnesium hydroxide,
- b) optionally 0.1-10% trihydrate, and
- c) optionally, 0.1-10% zinc borate,
- wherein said percentages are based on the weight of polyolefin and the sum of flame retardant components a) to c).
A process for the manufacture of a flame retardant polyolefin pallet or subassembly thereof, comprising
- a) supplying a polyolefin molding resin
- b) supplying a flame retardant package comprising flame retardant components
- b)i) from 8-35% magnesium hydroxide;
- b)ii) optionally from 0.1-10% alumina trihydrate;
- and
- b)iii) optionally from 0.1-10% zinc borate;
- c) uniformly blending said polyolefin resin with the components b)i to b)iii of said flame retardant package to form a flame retardant-containing polyolefin molding resin;
- and
- d) molding a polyolefin pallet or subassembly thereof from said flame retardant-containing polyolefin molding resin.
Dependencies are inferred from the claim text.