US 7,320,825 B2 | ||
Barrier coatings for oil and grease resistance | ||
Patrick Morabito, Matamoras, Pa. (US) | ||
Assigned to International Paper Company, Memphis, Tenn. (US) | ||
Filed on May 27, 2003, as Appl. No. 10/448,068. | ||
Prior Publication US 2004/0241475 A1, Dec. 02, 2004 | ||
Int. Cl. B32B 5/16 (2006.01) |
U.S. Cl. 428—402 [428/537.5; 428/507; 428/326; 428/328; 428/330; 427/391; 427/395] | 27 Claims |
1. A multi layer composite having oil and grease resistance comprising:
a) a paper or paperboard substrate,
b) a base coat on a surface of said substrate comprising a first polymer selected from the group consisting of film forming
natural and synthetic polymers in the substantial absence of a mineral pigment filler, and
c) a top coat on a surface of said base coat, said top coat comprising a continuous polymer phase comprising one or more film
forming synthetic polymers having dispersed therein a mixture of at least one platy mineral pigment and at least one non-platy
mineral pigment;
Said composite exhibits an oil and grease resistance equal to or less than about 4 as measured by “TAPPI-454 Turpentine Test
for Grease Resistance of Paper”, in which turpentine is replaced by Crisco Pure Vegetable Oil run at a temperature of 140°
F. for 24 hours at TAPPI conditions.
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