Sappi North America, Inc.

S.d. Warren Services Company

Alonzo K Osgood

Arbin Rajbanshi

Thomas A Waecker

Paige Allison Case Pomeroy

Douglas W Bousfield

John C Hassler

Phillip S Coleman

Oil and grease resistant paper products include a substrate and, on at least one side of the substrate, a continuous layer of a barrier coating, the barrier coating including a binder system and a pigment. The barrier coating, when applied to the substrate and dried to form a barrier layer, provides a continuous film of the binder system.

Oil/grease resistant paper products

Oil and grease resistant paper products are disclosed that include a substrate and, on at least one side of the substrate, a continuous layer of a barrier coating, the barrier coating comprising a binder system and a pigment. The barrier coating, when applied to the substrate and dried to form a barrier layer, has a Pigment Volume Concentration (PVC) that is below a Critical Pigment Volume Concentration (CPVC) of the barrier coating, providing a continuous three-dimensional film of the binder system. In some implementations the binder system comprising a latex and a natural binder and/or the paper product further includes a topcoat disposed on a side of the barrier coating opposite the substrate.

Devices and methods are provided to characterize local, small-scale variations in tack build-up, e.g., by measuring tack over areas smaller than 20 mm.sup.2, preferably over areas smaller than 1 mm.sup.2. These devices and methods measure the tack properties, e.g., tack build-up, of a coating over a very small area, allowing characterization of such small-scale variations. The invention also provides methods for using such characterization to predict back trap mottle (BTM).

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Portland, ME, United States of America

Alonzo K Osgood