Oil and grease resistant paperboard
A coated paperboard including a paperboard substrate having a first side and a second side, and a coating having one or more layers in contact with the first side of the paperboard substrate, the coating having a coat weight of at least 6.4 lbs per 3000 ft 2 and comprising binder and pigment and containing substantially no fluorochemical or wax, wherein the coated paperboard has a 3M Kit test value of at least 5, is at least 99% repulpable, and has no tendency toward blocking.
1. A coated paperboard comprising:
a paperboard substrate having a first side and a second side; and
a coating in contact with the first side of the paperboard substrate, the coating comprising binder and pigment, the coating containing substantially no fluorochemical or wax;
wherein the coated paperboard has a 3M kit test value of at least 5; and
wherein the coated paperboard is repulpable to the extent that after repulping the percentage accepts is at least 99%.
2. The coated paperboard of claim 1 , wherein the percentage accepts is at least 99.9%.
3. The coated paperboard of claim 1 , wherein the coating weight is at least 6.4 lbs per 3000 ft 2 .
4. The coated paperboard of claim 1 , wherein the coating weight is 6.4 to 10.7 lbs per 3000 ft 2 .
5. The coated paperboard of claim 1 , having no tendency toward blocking after being held for 24 hours at 50° C. at a pressure of 100 psi.
6. The coated paperboard of claim 1 , wherein the binder to pigment ratio in the coating is between 25 to 40 parts binder per 100 parts pigment, by weight.
7. The coated paperboard of claim 1 , wherein the binder to pigment ratio in the coating is between 30 to 35 parts binder per 100 parts pigment, by weight.
8. The coated paperboard of claim 1 , wherein the binder comprises at least one of styrene acrylate copolymer and styrene-butadiene copolymer.
9. The coated paperboard of claim 1 , wherein the pigment comprises at least one of a clay and calcium carbonate.
10. The coated paperboard of claim 1 , wherein the pigment comprises a No. 1 ultrafine kaolin clay.
11. The coated paperboard of claim 1 , wherein the pigment comprises a high aspect ratio platy clay.
12. The coated paperboard of claim 1 , wherein the pigment comprises at least one of a coarse ground calcium carbonate and a fine ground calcium carbonate.
13. The coated paperboard of claim 1 , wherein the binder comprises both styrene acrylate copolymer (SA) and styrene-butadiene copolymer (SBR).
14. The coated paperboard of claim 12 , wherein the binder comprises at least 20% SA and at least 35% SBR.
15. A coated paperboard comprising:
a paperboard substrate having a first side and a second side;
a coating in contact with the first side, the coating having a coat weight of at least 6.4 lbs per 3000 ft 2 and comprising binder and pigment, the coating containing substantially no fluorochemical or wax;
wherein the coated paperboard has a 3M Kit test value of at least 5, is at least 99% repulpable, and has no tendency toward blocking after being held for 24 hours at 50° C. at a pressure of 100 psi.
16. The coated paperboard of claim 15 , wherein the coating weight is 6.4 to 10.7 lbs per 3000 ft 2 .
17. A method of treating paperboard, the method comprising:
providing a paperboard substrate having a first side and a second side;
applying to the first side a coating comprising binder and pigment, and containing substantially no fluorochemical or wax;
wherein the resulting treated paperboard has a 3M Kit test value of at least 5, is at least 99% repulpable, and has no tendency toward blocking after being held for 24 hours at 50° C. at a pressure of 100 psi.
18. The method of claim 17 , wherein the coating is applied by a device selected from the group consisting of a blade coater, curtain coater, air knife coater, rod coater, film coater, short-dwell coater, spray coater, and metering film size press.
19. The method of claim 17 , wherein the coating is applied with a coat weight of at least 6.4 lbs per 3000 ft 2 .
20. The method of claim 17 , wherein the coating is applied with a coat weight from 6.4 to 10.7 lbs per 3000 ft 2 .