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1 USE OF BIOBASED METHYLPHTHALIC ANHYDRIDE OR ACID (3-MPA) IN THE SYNTHESIS OF POLYESTER POLYOLS FOR POLYURETHANES AND IN THE SYNTHESIS OF SOLVENT-BASED ALKYDS COATINGS 5 Stefano Iannaconea, Roger Bloklanda, Monique Wekkinga, Sandra Corderí Gándarab, Ferry Oomenb, Jady de Rooij b, Han van Kasterenb Harry Scholtmeijerc Henk van den Haakd Joost van Dijke 10 a Relement, Auvergnedijk 2, 4612PZ Bergen op Zoom, The Netherlands b MNEXT, Lovensdijkstraat 63, 4818 AJ Breda, The Netherlands c Fontys, De Rondom 1, 5612 AP Eindhoven d Resinconsult, Vliegeniersweg 46, 2171PC Sassenheim, Zuid-Holland e PUROC, Lage Morsweg 19, 2332 XA Leiden 15 1. Summary The present paper examines whether it is possible to synthesize polyester polyols using biobased 3-methylphthalic anhydride or biobased 3-methylphthalic 20 acid (3-MPA) and classic glycols. These polyester polyols can be later used as precursors with isocyanates in the synthesis of polyurethanes. Synthesis of polyester polyols with fossil based phthalic anhydride (PA) is abundantly present in literature, for example in Chinese patent CN110698659 or European patent EP1237975, and these protocols were used as base reference to create the 25 tested protocol. The present paper further examines bio-MPA as performance booster for alkyd coatings. Unsaturated Polyester polyols synthesis 30 2. Introduction Relement has developed a partly bio-based alternative for PA called bio- MPA or 3-MPA, short for 3-methylphthalic anhydride, consisting of 56% renewable carbon measured by 14C. Bio-MPA will become fully bio-based as 2 soon as the second of its two principal raw materials becomes available as bio- based. Polyurethanes (PU) are extensively utilized in the coatings industry due to the...