Biopolymers are an emerging application of castor oil and its derivatives. These biopolymers include castor based polyamides and castor based polyurethanes. (see also: Castor Oil Polyamide Biopolymer – Part I)
The world polyamide market size is over $25 billion.
Some prominent companies working on castor based polyamides and engineering plastics are:
| Company | Polyamide |
| Arkema | 6,11 |
| BASF | 6,10 |
| Du Pont | 6,10; 10,10 |
| DSM | 4,10 |
| EMS | 6,10; 10,10; 10T (PPA) |
| Evonik | 6,10 |