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.
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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.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
