Polymerisation of a UV-curing resin
Polymerizations expelling water, equally known as polycondensation (PET is a typical product), are a subset of polymerizations. The radical polymerization here is more likely to proceed differently with three reaction types running concurrently: initiation, propagation, and termination.

During the initiation, light splits the phenylketone into two fragments with one unpaired electron each. This is symbolized by the dot next to the oxygen atoms, denoting that these chemicals are radicals:


These radicals may react with one electron of the double bond of a neutral acrylate in the propagation reaction. Symbolized by blue is the newly formed single bond between the two reagents (first line).  Simultaneously, the other electron of the former double bond represents a new site where again a neutral acrylate may react (second line).  This growth of the polymer chain may continue again and again, or propagate (third line).


As soon as there are radicals formed, there may be a number of reactions where these carbon-centered radicals are consumed.  This cancels the further growth of the polymer chains.  Among these termination reactions, hydrogen-transfer / redox reactions as well as dimerizations are the most prominent ones.  Some which seem likely to occur are depicted below:



Structure
Your starting material consists of a starter, and a blend of bifunctional acrylates.  Thus the curation will yield polymer chains that are cross-linked with each other.  The illustration below (for a different material) symbolized this by the blue zig-zag lines:

(Konuray et al., Polymers 2018, 10, 178 doi 10.3390/polym10020178, open access)
Because you started with multiple different monomers, it would be an example of branched copolymers.