Billerud has been granted a patent for a coated paperboard featuring a specific pigment coating. This coating includes a mixture of calcium carbonate pigments and clay, combined with a binder, and adheres to defined particle size and weight ratios, enhancing the paperboard’s properties. GlobalData’s report on Billerud gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Billerud, Sustainable packaging paper coating was a key innovation area identified from patents. Billerud's grant share as of June 2024 was 61%. Grant share is based on the ratio of number of grants to total number of patents.
Coated paperboard with specific pigment and binder composition
The granted patent US12018436B2 describes a coated paperboard designed for various applications, particularly in packaging. The paperboard features a base board with a top side that is coated with a pigment mixture, which includes a specific combination of calcium carbonate (CaCO3) pigments and clay. The pigment mixture consists of 0-10% clay, 60-90% of a first CaCO3 pigment with a d50 of 0.60-0.80 µm, and 5-25% of a second CaCO3 pigment with a d50 between 0.53 and 0.73 µm. The binder used in the coating is either a styrene-butadiene or styrene-acrylate copolymer, with a defined dry weight ratio of pigment to binder ranging from 100:16 to 100:20. Additional features include a coat weight of 5-30 g/m² for the pigment coating and the potential for a pre-coating layer.
Further claims detail the composition and characteristics of the coated paperboard, including the use of ground calcium carbonate (GCC) for both pigments, the option for a reverse side coating, and the inclusion of a rheology modifier such as carboxymethyl cellulose (CMC) or an acrylic co-polymer. The patent also specifies the grammage of the base board, which can range from 120 to 300 g/m², and allows for variations in the clay type, with kaolin clay being a preferred option. The method of producing this coated paperboard involves applying the pigment coating composition to the base board, which may also include a pre-coating, and is suitable for creating packages for food or liquids.
To know more about GlobalData’s detailed insights on Billerud, buy the report here.
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