Patent ID: 6727317
Filing Date: 2004-04-27
Classification: C08L

Abstract:
A clarified temperature-sensing polypropylene article exhibiting walls of preselected thicknesses and comprising at least one base polypropylene component, at least one clarifying agent, and at least one separate non-polypropylene polymeric additive mixed thoroughly therein, wherein said article is transparent, wherein said at least one polypropylene component exhibits a melting temperature of at least 140Â° C., wherein said at least one non-polypropylene polymeric additive exhibits a melting temperature in the range of from about 60Â° to about 100Â° C., and wherein said at least one separate non-polypropylene polymeric additive is present in an amount to effectuate an opaque appearance to said article upon exposure to temperatures above the melting temperature of said additive and below the melting temperature of said polypropylene component and to permit said article to return to a transparent appearance upon subsequent reduction of the temperature to which said opaque article is exposed to a temperature below the melting point of said non-polypropylene polymeric additive, wherein the effectuation of such an opaque appearance indicates exposure to a temperature above the melting point of said non-polypropylene polymeric additive.