MULTIPLE-LEVEL POLYMER REGISTRATION IN THE DUPONT SCION DATABASE

The Chemical Abstracts Service Registry System (CASRS) has a relativel y unknown but very useful feature; with the exception of one situation , it has the capability of multiple-level source-based polymer registr ation, i.e., it will register a source-based polymer within a source-b ased polymer. The CASRS registers macromonomers in File Registry as si ngle-component substances. In contrast, macromonomers registered in th e DuPont SCION proprietary database by the CASRS are represented as mu lticomponent substances. Single-level CASRS registration of comb polym ers in SCION currently results in loss of identity of macromonomers as searchable components. Multilevel source-based registration provides a way to register multicomponent macromonomers as components of comb p olymers so that their registration numbers become part of comb polymer structure records.