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Issue 06/2021

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Highlights: Coating Films, Flexibles, Bags Basics: Cellulose based bioplastics

Coating Biopolymer

Coating Biopolymer coatings market preview The global biopolymer coatings market size was valued at USD 1.04 billion in 2020, is projected to hit around USD 1.79 billion by 2030 and is expected to grow at a compound annual growth rate (CAGR) of 5.4 % from 2021 to 2030. The reasons for this predicted growth are twofold, on the one hand, it is due to superior properties of coated materials and on the other, it is due to more environmental awareness. Biopolymer coating screate protective layers that shield the packaged product from exterior environmental conditions. These coatings prevent the transfer of unwanted moisture in food products as well as serve as oxygen and oil barrier. It is possible to incorporate antimicrobial agents with biopolymer coatings in order to create active paper packaging materials that offers an effective option for the protection of food items from microorganism infiltration. Hence, biopolymer coatings are a better substitute for synthetic paper and paperboard coatings. In addition, increasing global awareness for environmental pollution and the use of biodegradable products also propel the demand for the biopolymer coatings market. With the rising level of concern regarding environmental degradation, the use for biodegradable products and biopolymer coatings are estimated to flourish at a significant pace during the forecast timeframe. This also triggers the rate of research & development in the field of biopolymer coatings and bioplastics. This is amplified by increasing government support for the use of biodegradable plastics in various fields including packaging and coatings. Further, impending government regulations against the manufacturing of single-use plastics in key markets like China has compelled plastic manufacturers to ramp up their biodegradable plastic production. Apart from notable developments in the fields of bioplastics and biopolymer coatings, the market is still at its emerging phase and has a promising future growth opportunity. In order to curb the environmental pollution load, governments and plastic manufacturing companies are collaborating or partnering to move towards a more renewable future and a greener environment. Henceforth, the aforementioned factors are likely to support the market growth of biopolymer coatings remarkably in the upcoming years. At the link below interested readers find more information and can purchase a comprehensive report. AT 23 – 24 March • Hybrid Event Leading Event on Carbon Capture & Utilisation • Strategy & Policy • Green Hydrogen Production • Carbon Capture Technologies • Carbon Utilisation (Power-to-X): Fuels for Transport and Aviation, Building Blocks, Bulk and Fine Chemicals, Advanced Technologies / Artificial Photosynthesis • Innovation Award “Best CO2 Utilisation 2022“ Call for Innovation Submit your application Innovation Award Sponsor Innovation Award Co-Organiser Sponsor for the “Best CO2 Utilisation 2022” Organiser Contact Dominik Vogt Tel.: +49 2233 / 481449 12 bioplastics MAGAZINE [06/21] Vol. 16

Coating Biobased Binders for Coatings Approach or Reality? The world of coatings is a wide open field for the use of biobased materials. But what exactly are coatings? By definition a coating is one of the main manufacturing processes according to DIN 8580 [1]. Less formal in everyday language, we speak of a coating whenever a type of substrate is covered with another layer. This could be for example lacquer on metal, paint on the wall, stain on wood or even printing ink on paper or foil. Nearly all of these coatings have one thing in common: one of the main components is a resin used as the so called binder. They are known for example as polyesters, acrylic resins, polyurethanes, alkyd resins, epoxies and many more. In the past most of these binders were based solely on petrochemical components. Exemptions were the alkyds where the fatty acid content is biobased and resins based on gum rosin. Nowadays there are two approaches for the use of more renewable raw materials as building blocks for these coating binders: The mass-balance-approach and the use of real renewable, biobased raw materials. For details about the mass-balance-approach see [2] or bM issue 02/2021. The other approach is the use of real and directly biosourced building blocks which are now available in an industrial scale. These are not only the old-fashioned raw materials which have been in use for a long time, such as vegetable oils, glycerol, fatty acids or shellac, but also a growing number of new raw materials, especially polyols or carbon acids. They are derived for example from sugars, starch, natural oils, cellulose or lignin. [3, 4] A common, not so well-known building block with a high potential is gum rosin, which can be cropped from pine trees without the need for clear cutting the forests; thus helping to protect the environment from too much human disruption. By using smart ways of chemical synthesis, these natural based raw materials can be used to develop binders with the same performance as their fossil counterparts. A leading pioneer in the modification of gum rosin is the Robert Kraemer GmbH & Co. KG from Rastede, Germany. They started with the gum rosin business in the late 1920s. In the past 20 years, since the early 2000s, they developed from the classical rosin modifier to an innovative developer and producer for a wide range of biobased resins with a large R&D investment. [5] By creative chemical combination of gum rosin with other building blocks as described above, binders with up to 100 % biobased content can be designed for nearly every kind of coating Amongst classical binders for the lacquer and paints industries like rosin esters, alkyd resins or maleic modified rosin, as well as high performance resins like polyesters, urethanes or UV-curing binders are available. [6] They can also be used as combination partners to bring more green chemistry into formulations. As an example, biobased polyesters are used as pre-polymers for polyurethane dispersions; or special modified rosin resins are utilized in branching classical acrylic polymers to give them up to 50 % biobased content. These formerly 100 % fossil resins are now ready-made to bring significant amounts of renewable raw materials into coatings by these modifications. But the potential for biobased binders is even higher. In studies between the University of Technology Chemnitz and the company Robert Kraemer, resins derived from renewable raw-materials were found to be highperformance modifiers for bio-plastics such as poly-lactic acid (PLA). [7] Conclusion: Nowadays binders for a high content of renewable raw materials in coatings are already available on an industrial scale. Their performance is as good as their petrochemical counterparts’. Formulators and application technologists even have the choice between mass-balanced or directly sourced biobased materials. MT References: [1], access date 14th Nov 2021 [2] H. K.Jeswania, C. Krüger, A. Kicherer, F. Antony, A. Azapagica; Science of The Total Environment 2019, 687, 380-391 [3] Fachagentur Nachwachsende Rohstoffe e. V.; Marktanalyse Nachwachsende Rohstoffe, ISBN 978-3-942147-18-7, 2014 [4], access date 14th Nov 2021 [5], access date 14th Nov 2021 [6], access date 14th Nov 2021 [7] Fachagentur Nachwachsende Rohstoffe e. V.; Entwicklung neuartiger Modifikatoren auf Basis nachwachsender Rohstoffe für Compounds und Blends aus biobasierten Kunststoffen, final report 2019 bioplastics MAGAZINE [06/21] Vol. 16 13

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