Disposable, microwaveable containers having suitable food contact compatible olfactory properties and process for their manufacture
AssigneeFort James Corporation
InventorsRonald L. Cochran, II, Mark B. Littlejohn, Donald C. McCarthy, Cristian M. Neculescu, Robert Patterson, Anthony J. Swiontek
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Abstract
Low-odor microwaveable polypropylene/mica food contact articles are disclosed. The articles are prepared by low temperature processing and typically include odor-suppressing basic organic or inorganic compounds. Preferably, the articles are substantially free from C8 and C9 organic ketones associated with undesirable odors. Further improvements to the articles include crack-resistant embodiments with synergistic amounts of polyethylene and titanium dioxide.
Claims53
A microwaveable, disposable food container having food contact compatible olfactory properties formed from a melt-processed polyolefin/mica composition wherein said composition includes from about 40 to about 90 percent by weight of a polypropylene polymer and from about 10 to about 50 percent by weight mica as well as a basic organic compound or a basic inorganic compound and wherein said melt processed composition exhibits a relative aroma intensity index of less than about 1.6.
A microwaveable, disposable food contact container having food contact compatible olfactory properties formed of a melt-processed polyolefin/mica composition wherein said composition includes from about 40 to about 90 percent by weight of a polypropylene polymer and from about 10 to about 50 percent by weight mica and a basic organic or inorganic compound comprising the reaction product of an alkali metal or alkaline earth element with carbonates, phosphates, carboxylic acids as well as alkali metal and alkaline earth element oxides, hydroxides or silicates and basic metal oxides, including mixtures of silicone dioxide with one or more of the following oxides:
- magnesium oxide, calcium oxide, barium oxide, and mixtures thereof.
A microwaveable, disposable food container having food contact compatible olfactory properties formed from a melt-processed polyolefin/mica composition wherein said composition includes from about 40 to about 90 percent by weight of a polypropylene polymer and from about 10 to about 50 percent by weight mica and wherein said melt processed composition exhibits a relative aroma intensity index of less than about 1.6 and wherein said melt-processed polyolefin/mica composition contains less than about 3.5 ppm of extractable eight carbon and nine carbon alkyl ketones.
A microwaveable, disposable food container having food contact compatible olfactory properties formed from a melt-processed polyolefin/mica composition wherein said composition includes from about 40 to about 90 percent by weight of a polypropylene polymer and from about 10 to about 50 percent by weight mica and wherein said melt processed composition exhibits a relative aroma intensity index of less than about 1.6 and wherein said melt-processed polyolefin/mica composition has an abundance ratio of extractable 4-methyl-2-heptanone to 4-heptanone of less than about 0.5.
Dependencies are inferred from the claim text.