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AssigneeFort James Corporation
InventorsDonald C. McCarthy, Ronald L. Cochran II, Mark B. Littlejohn, Cristian M. Neculescu, Robert Patterson, Anthony J. Swiontek
Estimating the term…
Low-odor microwaveable mineral-filled polypropylene 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.
A method of preparing a microwaveable, mineral-filled polypropylene food contact article comprising:
The method according to claim 20, wherein said micronodular food contact surface exhibits a Parker Roughness Value of at least about 12 microns.
A microwaveable, mineral filled polypropylene food contact article formed from a sheet of a melt-compounded composition comprising from about 40 to about 90 percent by weight of a polypropylene polymer, from about 10 to about 50 percent by weight of a primary mineral filler and an effective odor-reducing amount of a basic organic or inorganic compound operative to impart an odor index of less that about 0.75 to said melt-compounded composition.
A low temperature process for preparing a polypropylene mineral filled melt-compounded composition comprising a basic odor suppressing agent, from about 40 to about 90 percent by weight of a polypropylene polymer and from about 10 to about 50 percent by weight of a mineral filler said melt-compounded composition exhibiting an odor index of less than about 0.75 said process comprising the sequential steps of:
A crack-resistant, food contact article having a wall thickness from about 10 to about about 80 mils consisting essentially of from about 40 to about 90 percent by weight of a polypropylene polymer, from about 10 to about 60 percent by weight of a mineral filler, from about 1 to about 15 percent by weight polyethylene, from about 0.1 to about 5 weight percent titanium dioxide and optionally including 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 silicon dioxide with one or more of the following oxides:
A method of preparing a microwaveable, mineral-filled polpropylene food contact article comprising:
A method of preparing a microwaveable, mineral-filled polypropylene food contact article comprising:
Dependencies are inferred from the claim text.