ABS is most commonly polymerized through the process of emulsion (the mixture of multiple products that don’t typically combine into a single product). A well known example of an emulsified product is milk. ABS is also created, albeit less commonly, by a patented process known as continuous mass polymerization. Globally, the most common methodology to create ABS is the emulsion process.
It is important to note that because ABS is a thermoplastic material, it can be easily recycled as mentioned above. This means that a common way of producing ABS plastic is from other ABS plastic (i.e. making ABS from ABS).