Preparation, characterization and selective reactions of novel [1,3]diazetidine-2,4-diones (uretdiones) — a new route to generate asymmetric substituted toluylenediisocyanate-derivatives
✍ Scribed by Nikolaus Risch; Ulrich Westerwelle; Jürgen Kiene; Ralf Keuper
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 33 KB
- Volume
- 341
- Category
- Article
- ISSN
- 1615-4150
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✦ Synopsis
Diisocyanates 1 are important building blocks in polymer chemistry [1]. In the manufacture of elastomers, plastics and coatings they react with polyhydroxylic components to give polyurethanes and with polyamines to give polyureas.
To meet the requirements for advanced materials it is necessary to look for new polymers with enhanced properties concerning optical permeability, viscoelasticity, defined structure etc. Special care is necessary in the handling of volatile isocyanates since their vapours are irritant. They are sensitizers at extremely low concentrations and need to be modified to guarantee a safe handling of these compounds. Hence, for industrial application they are often used in the form of blocked isocyanates. Blocked or masked isocyanates are the reaction products of the isocyanate group with low molecular weight alcohols, phenols, and some other compounds such as lactams; these reaction products decompose on