Technical PAPER Improve polyurethane surface coatings using oxazolidines and aldimines

摘要

This paper has an extensive introduction to isocyanate chemistry and commercial products. It introduces the various reactions of isocyanates with other chemicals, especially active hydrogen, containing products such as polyols and amines. It also includes explanations regarding the reasons for polyurethanes based on aromatic isocyanates tending to yellow on exposure to optical radiation, including Ultraviolet (UV) radiation, due to light-catalysed discolouration whereas in contrast aliphatic isocyanates generally do not suffer from such yellowing. The Incozol range of oxazolidines and aldimines produced by Incorez Ltd are introduced with further details regarding their applications in polyurethane chemistry as: 1. moisture scavengers 2. reactive diluents 3. latent curing agents