Manufacture of plastics in primary forms

This sub-class includes: - Manufacture of plastics in primary forms: + polymers, including those of ethylene, propylene, styrene, vinyl chloride, vinyl acetate and acrylics, + polyamides, + phenolic and epoxide resins and polyurethanes, + alkyd and polyester resins and polyethers, + silicones, + ion-exchangers based on polymers.