What it is and the problem it solves
PVC was commercially inert until Semon’s 1926 method made it flexible; it solved the problem of rigidity that had blocked prior commercialisation by Ostromislensky and Klatte.
How it works
Semon blended PVC with additives — starting with dibutyl phthalate — to disrupt its rigid polymer chains and introduce flexibility.
What works
The plasticization method works: it yielded elastic, non-adhesive vinyl; enabled commercial plasticizers; and produced Koroseal — a polymer whose consistency could be set deliberately.
What does not
It does not solve PVC’s thermal instability, chlorine emissions during combustion, or long-term plasticizer leaching — none of which the sources mention as addressed.
What it changes
It changes PVC from a brittle laboratory curiosity into a tunable industrial material — enabling Koroseal, a salt-coke-limestone-derived polymer adjustable in consistency.
Is it worth your time
Yes, if you work with polymers, materials procurement, or industrial design: it established the template for tuning synthetic plastics via additive chemistry.
