阅读说明：本技术 具有自然外观的防油、防脂和防潮的纸板 (Oil-, grease-and moisture-resistant paperboard with natural appearance ) 是由 逄杰斌 S.J.雷格尔 N.G.梅尔顿 T.克拉克 T.克鲁格 S.帕克 于 2018-04-26 设计创作，主要内容包括：本发明公开了具有自然外观的经涂布纸板,其包含基本不含有含氟化学品或蜡的防护涂层,表现出良好的防油性、防脂性和防潮性,并且不具有倾向于粘连的趋势。(coated paperboard with a natural appearance comprising a protective coating that is substantially free of fluorochemicals or waxes, exhibits good oil-, grease-, and moisture-repellency, and has no tendency to block.)

1. A coated paperboard comprising:

An unbleached paperboard substrate having a first side and a second side;

A first coating in contact with the first face, the first coating having about 6 to 14 lbs/3000 ft²And comprises a binder and a pigment, and is substantially free of fluorochemical or wax;

Wherein the coated paperboard provides barrier properties to at least one of oil, grease, and moisture; and is

wherein the coated paperboard has a natural appearance wherein the substrate fibers are substantially visible through the first coating layer.

2. The coated paperboard of claim 1, wherein the ratio of binder to pigment in the first coating layer is from 30 to 50 parts binder per 100 parts pigment by weight.

3. The coated paperboard of claim 2, wherein the ratio of binder to pigment in the first coating layer is from 35 to 45 parts binder per 100 parts pigment by weight.

4. The coated paperboard of claim 1, wherein the binder in the first coating comprises at least one of a styrene butadiene copolymer, a protein, a styrene acrylate copolymer, polyvinyl acetate, and a vinyl acrylic copolymer.

5. The coated paperboard of claim 1 further comprising a second coating applied over said first coating, said second coating having a total coat weight such that said first and second coatings are from about 10 to 20 lbs/3000 ft²And comprises a binder and a pigment, and is substantially free of fluorochemical or wax.

6. The coated paperboard of claim 5, wherein the ratio of binder to pigment in the second coating layer is from 30 to 50 parts binder per 100 parts pigment by weight.

7. the coated paperboard of claim 5, wherein the binder in the second coating comprises at least one of a styrene butadiene copolymer, a protein, a styrene acrylate copolymer, polyvinyl acetate, and a vinyl acrylic copolymer.

8. The coated paperboard of claim 1, wherein the 3M grease resistance test value is at least 4.

9. The coated paperboard of claim 5, wherein the 3M grease resistance test value is at least 10.

10. The coated paperboard of claim 1, wherein the coated paperboard has a 30-minute oil Cobb test result of at most 3 grams per square meter.

11. The coated paperboard of claim 10, wherein the coated paperboard has a 30-minute oil Cobb test result of at most 1 gram per square meter.

12. The coated paperboard of claim 1, wherein the coated paperboard has a water vapor transmission rate of less than 500 grams per square meter per day.

13. The coated paperboard of claim 12, wherein the coated paperboard has a water vapor transmission rate of less than 300 grams per square meter per day.

14. The coated paperboard of claim 12, wherein the coated paperboard has a water vapor transmission rate of less than 200 grams per square meter per day.

15. The coated paperboard of claim 1, which has no tendency to block after being held at 50 ℃ under a pressure of 100 psi for 24 hours.

16. The coated paperboard of claim 1, wherein the coated paperboard is repulpable to the extent that the percent accepts after repulping is at least 98%.

17. The coated paperboard of claim 1, wherein the pigment comprises at least one of clay and calcium carbonate.

18. The coated paperboard of claim 17, wherein the pigment comprises clay having a particle size of 90-100% < 2 microns.

19. The coated paperboard of claim 17, wherein the pigment comprises a platy clay having a high aspect ratio.

20. The coated paperboard of claim 17, wherein the pigment comprises ground calcium carbonate having a particle size of at least 60% < 2 microns.

21. a coated paperboard comprising:

An unbleached paperboard substrate having a first side and a second side;

A first coating in contact with the first face, the first coating having about 6 to 14 lbs/3000 ft²And comprises a binder and a pigment, and is substantially free of fluorochemical or wax;

wherein the coated paperboard provides barrier properties to at least one of oil, grease, and moisture; and is

Wherein the first side of the coated paperboard has L-a-ba color space value.

22. the coated paperboard of claim 21, wherein L is less than 62.

23. The coated paperboard of claim 21, wherein L is less than 60.

24. The coated paperboard of claim 21 further comprising a second coating applied over said first coating, said second coating having a total coat weight such that said first and second coatings are from about 10 to 20 lbs/3000 ft²And contains a binder and a pigment, and is essentiallyNo fluorochemical or wax is present.

25. A coated paperboard comprising:

An unbleached paperboard substrate having a first side and a second side;

A first coating in contact with the first face, the first coating having about 6 to 14 lbs/3000 ft²And comprises a binder and a pigment, and is substantially free of fluorochemical or wax;

Wherein the coated paperboard provides barrier properties to at least one of oil, grease, and moisture; and is

Wherein the first side of the coated paperboard has L-a-bA color space value.

26. the coated paperboard of claim 25 whereinbGreater than 9.5.

27. The coated paperboard of claim 25, further comprising a second coating applied over said first coating, said second coating having a total coat weight such that said first and second coatings are from about 10 to 20 lbs/3000 ft²And comprises a binder and a pigment, and is substantially free of fluorochemical or wax.

The invention belongs to the field of the following: the present disclosure relates to paperboard substrates that have oil-, grease-, and moisture-repellency properties while having a natural appearance while remaining highly repulpable, and do not have a tendency to block.

Background

Summary of The Invention

It is a general object of the present invention to provide oil, grease and moisture protection on unbleached paperboard by applying one or more layers of an aqueous coating that does not contain fluorochemicals or waxes. The coating may be applied on a paper machine or by an off-line coater. The paperboard coated according to the invention provides oil-, grease-and moisture-resistance, does not have any tendency to block, complies with safety and environmental regulations, has good repulpability, shows a natural appearance, and can be manufactured at low cost.

In one embodiment, a coated unbleached paperboard is disclosed, comprising an unbleached paperboard substrate having a first side and a second side; and a first coating in contact with the first face, the first coating having about 6 to 14 lbs/3000 ft²And comprises a binder and a pigment, the first coating being substantially free of fluorochemical orAnd (3) wax. The ratio of binder to pigment in the first coating layer may be 30 to 50 parts binder per 100 parts pigment by weight.

A second coating may be applied over the first coating, the second coating also being substantially free of fluorochemicals or waxes. The coated paperboard provides barrier properties to at least one of oil, grease, and moisture; and may be at least 98.5% repulpable.