Can you tell us how to formulate printing inks for non-polar plastics such as polyolefins ?
Printing on non-polar plastics can always be a problem if the surface has not first made wettable, e.g. by corona treatment or at least by flame treatment.
Here's suggested formula - all figures are in percent by weight
| Nylon resins | 15 - 20 % |
| Organic pigment | 8 - 12 % |
| Ethanol | 10 - 20 % |
| Isopropanol | 15 - 45 % |
| Ethyl acetate | 10 - 15 % |
| Wax dispersion | 4 % |
| Resin, e/g. dehydrated castor oil alkyd | 35% |
| Pigment ( titanium dioxide or others ) | 25 - 30 % |
| Extender | 10 - 15 % |
| White spirit | 10 % |
| Methoxybutanol | 10 % |
| Drier, e.g. Calcim naphthenate | 1 % |
