Thermoformed food containers with enhanced rigidity

Details Thermoformed food containers with enhanced rigidity Thermoformed food containers with enhanced rigidity

2005-04-19

2005-04-19

Moy, Joseph Man-Fu (Department: 3727)

Electric heating

Microwave heating

Cookware

C219S730000, C428S328000

Reexamination Certificate

active

06881937

ABSTRACT:
A thermoformed disposable food container having a wall caliper of from about 10 to about 80 mils consisting essentially of from about 30 to about 80 percent by weight of a matrix polymer composition consisting predominantly of a polypropylene polymer and optionally including a polyethylene polymer, from about 10 to about 50 percent mica, from about 2.5 to about 25 percent calcium carbonate, and up to about 5 weight percent titanium dioxide, exhibits enhanced rigidity when the calcium carbonate has a mean particle size of less than about 8 microns. The extrudable compositions are likewise useful for film, sheet and injection molding applications.

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Database WPI, Section Ch, Week 198603, Derwent Publications Ltd., London, GB; AN 1986-016517; XP002246036 & JP 60 238341 A (Idemitsu Petrochem Co), Nov. 27, 1985 & Patent Abstracts of Japan, vol. 010, No. 107 (C-341), Apr. 22, 1986 & JP 60 238341 A.
Database WPI, Section Ch, Week 199332, Derwent Publications Ltd., London, GB; AN 1993-252899; XP002246037 & JP 05 170985 A (Sekisui Chem Ind Co Ltd), Jul. 9, 1993.

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