IP Library › Granted Patent US 7,482,053
Granted Patent B2
US 7,482,053 · App. 10/995,932 · Granted Jan 27, 2009

Thermoformed food containers with enhanced rigidity

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Quick Facts
Patent No.
US 7,482,053
App. No.
10/995,932
Granted
Jan 27, 2009
Kind
B2
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.

Claims (16)

1. An extrudable composition consisting:

a) from about 30 to about 80 percent by weight of a matrix polymer composition, wherein the matrix polymer composition comprises at least about 50% polypropylene polymer;

b) from about 10 to about 50 percent mica;

c) from about 2.5 to about 25 percent calcium carbonate having a mean particle size of less than about 8 microns;

d) up to about 5 weight percent titanium dioxide; and

e) optionally a polyethylene polymer.

2. The extrudable composition according to claim 1 , wherein the calcium carbonate has a mean particle size of about 6 microns or less.

3. The extrudable composition according to claim 1 , wherein the calcium carbonate has a mean particle size of about 5 microns or less.

4. The extrudable composition according to claim 1 , wherein the calcium carbonate has a mean particle size of about 3 microns or less.

5. The extrudable composition according to claim 1 , wherein the calcium carbonate has a mean particle size of about 2.5 microns or less.

6. The extrudable composition according to claim 1 , wherein the calcium carbonate has a mean particle size of about 1 micron or less.

7. The extrudable composition according to claim 1 , wherein the polyethylene polymer is present at from about 1 to about 15% by weight of the extrudable composition.

8. The extrudable composition according to claim 1 , wherein the polyethylene polymer is present at from about 2.5 to about 7.5% by weight of the extrudable composition.

9. The extrudable composition according to claim 7 , wherein the polyethylene is HDPE.

10. The extrudable composition according to claim 1 , wherein the titanium dioxide is present at from about 0.5 to about 4% by weight.

11. The extrudable composition according to claim 1 , further comprising wherein a molded article has a normalized SSI rigidity of greater than 11 g/g.

Assignments (4)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 23, 2018
From: DIXIE CONSUMER PRODUCTS LLC
To: GPCP IP HOLDINGS LLC
Reel/Frame 045117/0734 →
RELEASE OF SECURITY AGREEMENT Recorded May 16, 2013
From: CITICORP NORTH AMERICA, INC.
To: GEORGIA-PACIFIC LLC, DELAWARE LIMITED PARTNERSHIP; GEORGIA-PACIFIC CONSUMER PRODUCTS LP, DELAWARE LIMITED LIABILITY COMPANY; GEORGIA-PACIFIC CORRUGATED LLC, DELAWARE LIMITED LIABILITY COMPANY; DIXIE CONSUMER PRODUCTS LLC, DELAWARE LIMITED LIABILITY COMPANY; GEORGIA-PACIFIC GYPSUM LLC, DELAWARE LIMITED LIABILITY COMPANY; GEORGIA-PACIFIC CHEMICALS LLC, DELAWARE LIMITED LIABILITY COMPANY; GEORGIA-PACIFIC WOOD PRODUCTS LLC, DELAWARE LIMITED LIABILITY COMPANY; COLOR-BOX LLC, DELAWARE LIMITED LIABILITY COMPANY; GP CELLULOSE GMBH, ZUG, SWITZERLAND LIMITED LIABILITY COMPANY
Reel/Frame 030669/0958 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 13, 2007
From: FORT JAMES CORPORATION
To: DIXIE CONSUMER PRODUCTS LLC
Reel/Frame 018883/0749 →
SECURITY AGREEMENT Recorded Feb 23, 2006
From: ASHLEY, DREW & NORTHERN RAILWAY COMPANY; BROWN BOARD HOLDING, INC.; CP&P, INC.; COLOR-BOX, LLC; FORT JAMES CORPORATION; FORT JAMES MAINE, INC.; FORT JAMES OPERATING COMPANY; FORT JAMES GREEN BAY L.L.C.; PRIM COMPANY L.L.C.; KMHC, INCORPORATED; GEORGIA-PACIFIC FOREIGN HOLDINGS, INC.; GEORGIA-PACIFIC RESINS, INC.; GEORGIA-PACIFIC WEST, INC.; GEORGIA-PACIFIC FINANCE, LLC; GREAT NORTHERN NEKOOSA CORPORATION; LEAF RIVER FOREST PRODUCTS, INC.; NEKOOSA PACKAGING CORPORATION; MILLENNIUM PACKAGING SOLUTIONS, LLC; SOUTHWEST MILLWORK AND SPECIALTIES, INC.; WEST GEORGIA MANUFACTURING COMPANY; BLUE RAPIDS RAILWAY COMPANY; BRUNSWICK PULP LAND COMPANY, INC.; CECORR, INC.; ENCADRIA STAFFING SOLUTIONS, INC.; FORT JAMES INTERNATIONAL HOLDINGS, LTD.; GEORGIA-PACIFIC INVESTMENT, INC.; FORT JAMES CAMAS L.L.C.; FORT JAMES NORTHWEST L.L.C.; G-P GYPSUM CORPORATION; GEORGIA-PACIFIC CHILDCARE CENTER, LLC; GEORGIA-PACIFIC HOLDINGS, INC.; G-P OREGON, INC.; GEORGIA-PACIFIC ASIA, INC.; GLOSTER SOUTHERN RAILROAD COMPANY; GREAT SOUTHERN PAPER COMPANY; OLD PINE BELT RAILROAD COMPANY; NEKOOSA PAPERS INC.; TOMAHAWK LAND COMPANY; XRS, INC.; PHOENIX ATHLETIC CLUB, INC.; KOCH RENEWABLE RESOURCES, LLC; KOCH FOREST PRODUCTS HOLDING, LLC; KOCH WORLDWIDE INVESTMENTS, INC.; OLD AUGUSTA RAILROAD, LLC; BRUNSWICK CELLULOSE, INC.; LEAF RIVER CELLULOSE, LLC; KOCH CELLULOSE AMERICA MARKETING, LLC; KOCH CELLULOSE, LLC; BLUEYELLOW, LLC
To: CITICORP NORTH AMERICA, INC.
Reel/Frame 017626/0205 →