US2012267368A1PendingUtilityA1

Disposable lid having polymer composite of polyolefin and mineral filler

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Assignee: WU WEN PAOPriority: Apr 21, 2011Filed: Apr 18, 2012Published: Oct 25, 2012
Est. expiryApr 21, 2031(~4.7 yrs left)· nominal 20-yr term from priority
Inventors:Wen P. WuAlan H. Forbes
C08K 3/34C08L 23/12C08K 3/10C08K 3/26B65D 43/00C08K 2003/265
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PatentIndex Score
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Claims

Abstract

Disposable lid comprises a thermoformed sheet in the shape of a lid for a hot beverage container. The sheet comprises a polymer composite of a polyolefin and at least one mineral filler. The sheet has a thickness less than about 0.035 inches and a heat deflection temperature at least comparable to that of high impact polystyrene.

Claims

exact text as granted — not AI-modified
1 . A disposable lid comprising:
 a thermoformed sheet in the shape of a lid for a hot beverage container, the sheet comprising a polymer composite of a polyolefin and at least one mineral filler;   wherein the sheet has a thickness less than about 0.035 inches and a heat deflection temperature at least comparable to that of high impact polystyrene.   
     
     
         2 . The disposable lid of  claim 1 , wherein the heat deflection temperature is at least about that of high impact polystyrene. 
     
     
         3 . The disposable lid of  claim 1 , wherein the heat deflection temperature according to ASTM D648-06 Standard Test Method for Deflection Temperature of Plastics Under Flexural Load in the Edgewise Position (2006) is at least about 87° C. 
     
     
         4 . The disposable lid of  claim 1 , wherein the mineral filler includes a high aspect ratio mineral filler. 
     
     
         5 . The disposable lid of  claim 4 , wherein the mineral filler is selected from the group consisting of talc, mica, wollastonite, or combinations thereof. 
     
     
         6 . The disposable lid of  claim 4 , wherein the polymer composite comprises at least about 10% by weight of the mineral filler. 
     
     
         7 . The disposable lid of  claim 1 , wherein the mineral filler includes a low aspect ratio mineral filler. 
     
     
         8 . The disposable lid of  claim 7 , wherein the mineral filler includes calcium carbonate. 
     
     
         9 . The disposable lid of  claim 7 , wherein the polymer composite comprises at least about 20% by weight of the mineral filler. 
     
     
         10 . The disposable lid of  claim 1 , wherein the polyolefin is selected from the group consisting of polypropylene homopolymer, polypropylene impact copolymer, ethylene-propylene random copolymer, high density polyethylene, or combinations thereof. 
     
     
         11 . The disposable lid of  claim 1 , wherein the polyolefin includes polypropylene, the mineral filler includes a high aspect ratio mineral filler, and the polymer composite comprises at least about 10% by weight of the mineral filler. 
     
     
         12 . The disposable lid of  claim 1 , wherein the polyolefin includes polypropylene, the mineral filler includes a low aspect ratio mineral filler, and the polymer composite comprises at least about 20% by weight of the mineral filler. 
     
     
         13 . The disposable lid of  claim 1 , wherein the polyolefin includes high density polyethylene, the mineral filler includes a high aspect ratio mineral filler, and the polymer composite comprises at least about 20% by weight of the mineral filler. 
     
     
         14 . The disposable lid of  claim 1 , wherein the polyolefin includes high density polyethylene, the mineral filler includes a low aspect ratio mineral filler, and the polymer composite comprises at least about 40% by weight of the mineral filler. 
     
     
         15 . The disposable lid of  claim 1 , wherein the polyolefin includes polypropylene, the mineral filler includes a high aspect ratio mineral filler, and the polymer composite has a shrinkage comparable to that of high impact polystyrene. 
     
     
         16 . The disposable lid of  claim 15 , wherein the polymer composite has a shrinkage of about 0.5% to about 1.0% when measured according to the ASTM D955 standard (1996). 
     
     
         17 . The disposable lid of  claim 15 , wherein the polymer composite comprises about 20% to about 40% by weight of the mineral filler 
     
     
         18 . The disposable lid of  claim 1 , wherein the polyolefin includes high density polyethylene, the mineral filler includes a high aspect ratio mineral filler, and the polymer composite has a shrinkage comparable to that of polypropylene. 
     
     
         19 . The disposable lid of  claim 18 , wherein the polymer composite has a shrinkage of about 1.25% to about 1.75% when measured according to the ASTM D955 standard (1996). 
     
     
         20 . The disposable lid of  claim 18 , wherein the polymer composite comprises about 30% to about 50% by weight of the mineral filler. 
     
     
         21 . The disposable lid of  claim 1 , wherein the polymer composite consists essentially of the polyolefin and the at least one mineral filler. 
     
     
         22 . The disposable lid of  claim 1 , wherein the polymer composite further comprises additives selected from the group consisting of colorants, processing aids, and combinations thereof. 
     
     
         23 . The disposable lid of  claim 1 , wherein the hot beverage container is a coffee cup. 
     
     
         24 . The disposable lid of  claim 1 , wherein the polymer composite has a carbon footprint lower than high impact polystyrene. 
     
     
         25 . The disposable lid of  claim 1 , wherein the polymer composite has a greenhouse gas emission lower than high impact polystyrene.

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