ethylene + benzene -> styrene
best way to get benzene seems to be best acquired through severely steam cracked heavy fuel which doesn't seem too hard to come by, ethylene I already have production for I should probably hook it up to the ME system and polymerize it on demand
butadiene from lightly steam cracked naphtha which I'll be getting anyways if I make a distillation tower, so all's well there
styrene-butadiene rubber shouldn't be too hard to make, I just need to make a fuckign distillation tower