The name petroleum resins can refer to industrial materials whose identities are much less specific than those of a pure organic molecule. For CAS 64742-16-1, the European Chemicals Agency gives a process-based definition: a complex combination of predominantly hydrocarbon compounds obtained as a fraction of the extract from solvent extraction of residuum. The description emphasizes high molecular weight compounds with high carbon-to-hydrogen ratios. It does not define a single molecular formula or a unique repeating polymer unit.
This identity must be separated from a common commercial use of the same general name. Many adhesive-industry products called petroleum or hydrocarbon resins are made by polymerizing selected unsaturated feedstocks and are described as C5, C9 or mixed resins. That familiar account cannot automatically be transferred to every material registered under CAS 64742-16-1. The official definition here refers to a petroleum separation stream, so a product's manufacturing history and supplier documentation are essential to establishing what it actually contains.
The substance illustrates the purpose of a process-based identity. In a complex petroleum material, listing every constituent may be impractical, and the relative proportions can vary. The origin of the feed and the extraction and fractionation operations therefore help define the substance. A high carbon-to-hydrogen ratio describes an overall compositional characteristic, not proof that every constituent has one aromatic skeleton. Nor does the broad word resin establish a universal softening point, color or adhesive performance.
An ECHA registration dossier for this CAS describes the registered test material as a UVCB substance containing saturated aliphatic and aromatic hydrocarbons. UVCB denotes substances of unknown or variable composition, complex reaction products or biological materials. The identity is meaningful for registration and documentation, but it does not make all supplier grades experimentally interchangeable. A useful technical account must connect measured properties and any claimed application to the actual material tested. Public evidence reviewed here supports this identity-focused description; it does not justify assigning the standard C5/C9 tackifier story to the entire CAS entry.
References:
1. ECHA. Petroleum resins; EC 265-116-8; CAS 64742-16-1. Substance identity and EC Inventory description. https://echa.europa.eu/substance-information/-/substanceinfo/100.059.179
2. ECHA. Registration dossier 26961. Petroleum resins; CAS 64742-16-1. Test material identity and UVCB description. https://echa.europa.eu/registration-dossier/-/registered-dossier/26961/4/8
|
chemBlink Chemical Story