Star oligomers for low VOC polyurethane coatings View Full Text


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Article Info

DATE

1998-03

AUTHORS

J Huybrechts, K Dusek

ABSTRACT

Hydroxyl functional star oligomers prepared by ring-opening polycondensation have a narrow molecular weight and composition distribution. Such oligomers give a solids/viscosity advantage over linear structures at the same molecular weight and can be used in low VOC two component polyurethane coatings. The solids/viscosity advantage is a combination of the highly branched structure and the narrow molecular weight distribution. Acrylic polyols formulated at the same molecular weight/polarity/average functionality and hydroxyl value give poorer drying properties. This difference can be explained by the fact that the free radical polymerisation technique leads to polymer compositions having a broad molecular weight and functionality distribution and high fractions of polymer with a low functionality. The potlife of acrylic polyols based formulations is adversely affected by the higher fractions of high molecular weight material and with a high average functionality. In low VOC polyurethane formulations star oligomers need to be formulated within a narrow range of compositions (TG, polarity), functionality and molecular weight to get an optimum balance of drying properties and potlife. More... »

PAGES

117-127

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02693852

DOI

http://dx.doi.org/10.1007/bf02693852

DIMENSIONS

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