I want to make my own iron-on labels and patches (small scale, for fun).

Does anyone know what the name of the adhesive is? All I can find when I search online are people wanting to sell me pre-made patches, not information about their composition.

I presume it’s some low melting point (<100degC) polymer. For all I know a wide variety of things might work (maybe even PETG 3d printer filament, which softens around 70degC, or hot glue shavings), but I’d like to see if I can at least find out the name of what’s commercially used.

EDIT: Solved, see https://aussie.zone/comment/4326482