Granted Patent B2

US 12,420,535 · App. 15/812,276 · Granted Sep 23, 2025

Inventors: Mark Parsons (Terre Haute, IN); Danny Nevins (Terre Haute, IN); Doug Brownfield (Mason, OH)

Assignee: AMPACET CORPORATION

B32B27/08B32B27/20B32B27/32C08K3/26C08L23/06B32B2250/02B32B2250/03B32B2323/043B32B2323/046C08K2003/265C08K2201/005

Abstract

Claims (15)

1. A synthetic paper including one or more resin layers formed from a composition comprising:

a high density polyethylene resin present in an amount of about 40 percent to about 60 percent by weight of the composition;

a particulate filler having a mean particle size of about 10 μm to about 30 μm; and

a cyclic olefin copolymer produced by copolymerization of ethylene with at least one cyclic olefin monomer, the at least one cyclic olefin monomer comprises at least one of: cyclopentadiene, a cyclopentadiene derivative, dicyclopentadiene, a dicyclopentadiene derivative, norbornene, dihydrodicyclopentadiene, phenyl norbornene, and tetracyclododecene, or a combination thereof,

wherein the synthetic paper has a dead fold angle of about 20° to about 30° and an Elmendorf tear strength of about 100 mN to about 1000 mN in a transverse direction.

2. The synthetic paper of claim 1 , wherein the particulate filler is present in the composition in an amount of 10% to 40% by weight of the composition.

3. The synthetic paper of claim 1 , wherein the particulate filler comprises calcium carbonate.

4. The synthetic paper of claim 1 , wherein the synthetic paper comprises at least two resin layers.

5. The synthetic paper of claim 4 , wherein the at least two resin layers comprise a first resin layer and a second resin layer, wherein a polyolefin resin in the first resin layer is different from a polyolefin resin in the second resin layer.

6. The synthetic paper of claim 1 , wherein the synthetic paper comprises at least three resin layers.

7. The synthetic paper of claim 1 , having a thickness of about 0.5 mils to about 4 mils.

8. The synthetic paper of claim 1 , wherein the cyclic olefin copolymer is present in an amount of about 2 percent to about 10 percent by weight of the composition.

9. The synthetic paper of claim 1 , wherein the synthetic paper has an Elmendorf tear strength of about 50 mN to about 750 mN in a machine direction.

10. The synthetic paper of claim 1 , wherein the synthetic paper has a moisture vapor transmission rate (MVTR) of less than 1 g/m 2 , as measured over a twenty-four-hour period at approximately 38° C. and approximately 90% relative humidity.

11. The synthetic paper of claim 1 , wherein the synthetic paper is 50% to 95% opaque.

Assignments (2)

Continuity (2)

References Cited (76)