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Authors
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Pavlova, E. ; Voit, B. ; Duskova-Smrchova, M. ; Dusek, K.
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Title
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Novel hyperbranched polymers for polyurethane coatings: Their preparation and crosslinking with polyisocyanates
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Date
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14.12.2004
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Number
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12807
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Abstract
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Novel hyperbranched polyesters (HBP) bearing hydroxyl groups, based on 4,4-bis-(4-hydroxyphenyl)pentatonic acid were synthesized by melt polycondensation at 230 °C under vacuum. The number-average molecular weights of products ranged between 2,000 and 3,000 g/mol. The average functionality was 9-11 hydroxyl groups per molecule. High-solids polyurethane coatings were prepared by cross-linking with trimer of hexamethylene diisocyanate. Model kinetic studies were performed with 4-ethylphenol. The half-life of reaction of HBP with triisocyanate (about 480 min at 25 °C) was approximately four times lower than that for 4-ethylphenol due to steric hindrance in the HBP structure. The glass transition temperature of cured coatings was about 120 °C. The surfaces of films were smooth and relatively polar. HBP proved to be suitable precursor for elevated temperature cured, two-component high-solids polyurethane coatings.<br /><br />New Developments in Coatings Technology<br />The 228th ACS National Meeting, in Philadelphia, PA, August 22-26, 2004
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Publisher
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Polymer Preprints
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Wikidata
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Citation
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Polymer Preprints 45 (2004) 217-218
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DOI
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http://oasys2.confex.com/acs/228nm/techprogram/P755996.HTM
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