Code of Federal Regulations Title 40. Protection of Environment § 40.721.650 11–Aminoundecanoic acid

(i) An intermediate in the manufacture of polymers in an enclosed process when it is expected that the 11–aminoundecanoic acid will be fully polymerized during the manufacturing process, or

(ii) A component in photoprocessing solutions.

(i) Enclosed process means a process that is designed and operated so that there is no intentional release of any substance present in the process. A process with fugitive, inadvertent, or emergency pressure relief releases remains an enclosed process so long as measures are taken to prevent worker exposure to and environmental contamination from the releases.

(ii) Internal subunit means a subunit that is covalently linked to at least two other subunits. Internal subunits of polymer molecules are chemically derived from monomer molecules that have formed covalent links between two or more other molecules.

(iii) Monomer means a chemical substance that has the capacity to form links between two or more other molecules.

(iv) Polymer means a chemical substance that consists of at least a simple weight majority of polymer molecules but consists of less than a simple weight majority of molecules with the same molecular weight. Collectively, such polymer molecules must be distributed over a range of molecular weights wherein differences in molecular weight are primarily attributable to differences in the number of internal subunits.

(v) Polymer molecule means a molecule which includes at least four covalently linked subunits, at least two of which are internal subunits.

(vi) Subunit means an atom or group of associated atoms chemically derived from corresponding reactants.