Why are styrene acrylate copolymers used for toner?

I have been scratching my head lately, after learning that laser printer toners are often made from *styrene-acrylate* copolymers. As of yet, I have not found information on these polymers in reference texts or papers/research outside of the realm of xerography, electrophotography, and other printing technologies. **What properties make these polymers particularly interesting for toners, but completely uninteresting to other fields**? At risk of overreaching, I'm also curious how these copolymers came to be used in toner in the first place, given the lack of convenient information?


References: 


1. *Reactive Polymers Fundamentals and Applications*, chapter 20 "Toners"
2. *Production of carbon black acrylic composite as an electrophotographic toner using emulsion aggregation method:
Investigation the effect of agitation rate*, paper by Maryam
Ataeefard
3. *Production of black toner through emulsion aggregation of magnetite, carbon black, and styrene-acrylic co-polymer:
Investigation on the effect of variation in components*, paper by
Maryam Ataeefard
4. Various MSDS pages from toner and laser printer manufacturers


