Acid reactable inorganic mineral fillers having improved compatibility with polyolefin resins
AssigneeThe Continental Group, Inc.
InventorStephen W. Cornell
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Abstract
Mineral fillers reactable with acids such as metal carbonates such as CaCO.sub.3 are rendered more compatible with polyolefin resins such as polyethylene by first reacting the filler with a long chain carboxylic acid to form a surface film of the acid. The acid reacted filler is contacted with a vinyl ester of the acid which is then polymerized in the presence of a free radical catalyst such as benzoyl peroxide to encapsulate the acid reacted filler in a coating of the polymerized ester.
Claims6
A food container formed from a polyolefin having intimately incorporated therein a coated filler prepared by the sequential steps of reacting an inorganic, acid reactable mineral filler with a long chain carboxylic acid having 8 to 22 carbon atoms to form an acid reacted filler surface,
- contacting the acid reacted filler with a vinyl ester of a long chain carboxylic acid having 8 to 22 carbon atoms and then
- polymerizing the vinyl ester to encapsulate the acid reacted filler with a polymerized coating of the vinyl ester.
Dependencies are inferred from the claim text.