Premium
New low viscous polyisocyanates for VOC compliant systems
Author(s) -
Mundstock Holger,
Pires Raul,
Richter Frank,
Schmitz Jörg
Publication year - 2002
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200209)187:1<281::aid-masy281>3.0.co;2-h
Subject(s) - viscosity , polyurethane , materials science , aqueous solution , chemical engineering , monomer , intrinsic viscosity , polymer chemistry , polymer science , composite material , polymer , chemistry , organic chemistry , engineering
Abstract Since 1961, aliphatic polyisocyanates based on HDI‐biurets are used as light stable hardeners for 2‐K polyurethane coatings. The market introduction of the HDI‐isocyanurates or simply 'trimers' in the early 1980's was driven by their lower viscosity and their better monomer stability. The most recent development in HDI‐polyisocyanate research are the iminooxadiazinediones (asymmetric trimers). In this paper, a new product based on that technology with a very low viscosity (700 mPas@23°C) and a NCO‐functionality of more than 3 is presented. Because of its low viscosity, this hardener can be easily incorporated into aqueous systems and is the solution for high and full solids coatings as well.