Embodiments of the present disclosure are directed to coated substrates including a substrate having first and second major surfaces and a compostable coating disposed on at least one of the first and second major surfaces of the substrate. The substrate includes a cellulosic material. The compostable coating includes at least one compostable polymer and a dispersant and may disposed on the substrate at a coat weight less than about 20 grams per square meter. The coated substrate has a grease resistance ranging from about 4 to about 12 as measured in accordance with the TAPPI 559 kit test. In some embodiments, the compostable coating is formed from an aqueous dispersion of the compostable polymer and the dispersant.

Embodiments of the present disclosure are directed to coated substrates including a substrate having first and second major surfaces and a compostable coating disposed on at least one of the first and second major surfaces of the substrate. The substrate includes a cellulosic material. The compostable coating includes at least one compostable polymer and a dispersant and may disposed on the substrate at a coat weight less than about 20 grams per square meter. The coated substrate has a grease resistance ranging from about 4 to about 12 as measured in accordance with the TAPPI 559 kit test. In some embodiments, the compostable coating is formed from an aqueous dispersion of the compostable polymer and the dispersant.

The present invention provides water-based polymeric coatings, which are free of styrene, have enhanced bio-based content, excellent water resistance, grease resistances, and are heat sealable. The coatings are highly suitable for surface treatment of cellulose-based substrates and finished products made therefrom, for example disposable drinking cups.

The present invention provides water-based polymeric coatings, which are free of styrene, have enhanced bio-based content, excellent water resistance, grease resistances, and are heat sealable. The coatings are highly suitable for surface treatment of cellulose-based substrates and finished products made therefrom, for example disposable drinking cups.

The method of the present invention specifically comprising following steps: adding a chitosan to an acetic acid solution, heating and stirring until clear, to obtain an acidic chitosan solution; then adding a palm wax and heating a resulting mixture to 80-100 C. with a constant temperature and a high-speed stirring for emulsification for 5-15 minutes; after the emulsification is completed, an obtained emulsion is quickly cooled to a room temperature. The present invention uses a single-layer coating method to prepare waterproof and oil-proof food cardboard, simplifying operation and achieving good waterproof, oil-proof, and antibacterial effects with a lower coating amount, thereby reducing production costs. When a coating amount is 5-10 g/m.sup.2, a Cobb.sub.60 value can reach 5-9 g/m.sup.2, an oil resistance level can reach 11-12 levels, a water contact angle can reach over 130, and an antibacterial rate can reach over 90%.

The present disclosure is drawn to primer compositions, which can include a polyvinyl alcohol, a cationic salt, and water. The polyvinyl alcohol can be present in an amount of at least 8 wt % of all dry components of the primer composition. The cationic salt can be present in an amount of at least 15 wt % of all dry components of the primer composition. The polyvinyl alcohol and cationic salt together can make up at least 30 wt % of all dry components of the primer composition.

The present disclosure is drawn to primer compositions which can include a binder including polyvinyl alcohol, starch nanoparticles, and a polymer latex dispersion. The primer competitions can also include a wax, a cationic salt, and water.

The present disclosure is drawn to primer compositions which can include a binder including polyvinyl alcohol, starch nanoparticles, and a polymer latex dispersion. The primer competitions can also include a wax, a cationic salt, and water.

A wet coating composition useful for coating a cellulosic fiber-based substrate is provided. The composition includes two aqueous emulsions. The first emulsion includes an oxidized paraffin/polyethylene wax and the second emulsion includes an ethylene/acrylic acid copolymer wax, ethylene/acrylic amide copolymer wax, ethylene/acrylic acid/acrylic amide copolymer wax or a mixture thereof. The oxidized paraffin/polyethylene wax has a surface energy less than or equal to 25 mN/m being substantially dispersive energy. The wet coating composition when dried forms a coating having a surface energy ranging from 20 to 60 mN/m being the sum of dispersive and polar energies. A process for treating a cellulosic fiber-based substrate with the wet coating composition, a substrate coated and articles including the coated substrate are also described. The process involves a heating step to allow migration of the coating towards a core of the cellulosic fiber-based substrate.

A wet coating composition useful for coating a cellulosic fiber-based substrate is provided. The composition includes two aqueous emulsions. The first emulsion includes an oxidized paraffin/polyethylene wax and the second emulsion includes an ethylene/acrylic acid copolymer wax, ethylene/acrylic amide copolymer wax, ethylene/acrylic acid/acrylic amide copolymer wax or a mixture thereof. The oxidized paraffin/polyethylene wax has a surface energy less than or equal to 25 mN/m being substantially dispersive energy. The wet coating composition when dried forms a coating having a surface energy ranging from 20 to 60 mN/m being the sum of dispersive and polar energies. A process for treating a cellulosic fiber-based substrate with the wet coating composition, a substrate coated and articles including the coated substrate are also described. The process involves a heating step to allow migration of the coating towards a core of the cellulosic fiber-based substrate.