Fiber-Containing Lid With High Polymer Mating Region

Abstract

A lid for a container having an upper rim bead, the lid having a fiber-containing body and a mating portion depending from the body that is configured to mate with the upper rim bead, wherein the mating portion has a higher weight percentage of a polymer than the body. The mating portion can include the polymer on a medial or lateral surface, and/or inside the mating portion, or the mating portion can be entirely made of polymer.

What is claimed is: 
     
         1 . A lid for a container having an upper rim bead, the lid comprising:
 a body comprising a first fibrous material; and   a mating portion depending from the body, the mating portion comprising a second fibrous material, and having a recess configured to mate with the upper rim bead;   wherein the mating portion has a higher weight percentage of a first polymer than the body.   
     
     
         2 . The lid of  claim 1 , wherein the mating portion comprises a medial layer of the first polymer, and a lateral layer of the second fibrous material. 
     
     
         3 . The lid of  claim 1 , wherein the first fibrous material of the body is continuous with the second fibrous material of the mating portion. 
     
     
         4 . The lid of  claim 1 , wherein the body has a layer of the first polymer. 
     
     
         5 . The lid of  claim 1 , wherein the mating portion has a second layer of the first polymer. 
     
     
         6 . The lid of  claim 5 , wherein the second layer comprises a second polymer that has a different chemical composition that the first layer. 
     
     
         7 . The lid of  claim 1 , wherein the body has a drinking hole, and a layer of a second polymer disposed about the drinking hole. 
     
     
         8 . The lid of  claim 7 , wherein the layer of the second polymer extends at least 5 mm around the drinking hole. 
     
     
         9 . The lid of  claim 7 , wherein the body has a raised portion disposed about a central depression, and the drinking hole is disposed in the raised portion. 
     
     
         10 . The lid of  claim 1 , wherein the lid has no more than 10 wt % of the first polymer. 
     
     
         11 . The lid of  claim 1 , wherein the lid has no more than 5 wt % of the first polymer. 
     
     
         12 . The lid of  claim 1 , wherein the lid has no more than 1 wt % of the first polymer. 
     
     
         13 . The lid of  claim 2 , wherein the medial layer is at least 0.1 mm thick. 
     
     
         14 . The lid of  claim 2 , wherein the medial layer is at least 0.3 mm thick. 
     
     
         15 . The lid of  claim 2 , wherein the mating portion flares outwardly to a bottom of the lid. 
     
     
         16 . The lid of  claim 1 , wherein the recess comprises an annular indentation having a depth of at least 1.5 mm. 
     
     
         17 . (canceled) 
     
     
         18 . The lid of  claim 1 , further comprising a second layer of the first polymer disposed within, or lateral to, the lateral layer of the second fibrous material. 
     
     
         19 . The lid of  claim 1 , wherein the first polymer comprises at least one of polyethylene and polydiketoenamine.