New development of polyurethane dispersion derived from blocked aromatic diisocyanate

S. Subramani, Young Jun Park, Young Soo Lee, Jung Hyun Kim

Research output: Contribution to journalArticlepeer-review

84 Citations (Scopus)

Abstract

Making water dispersible/reducible blocked-isocyanates facilitates incorporation of blocked-isocyanates into an aqueous dispersion of co-reactant. Anionically modified methyl ethyl ketoxime (MEKO), ε-caprolactam (CL) and 3,5-dimethylpyrazole (DMP) blocked aromatic diisocyanates (toluene 2,4-diisocyanate, TDI and 4,4′-diphenylmethane diisocyanate, MDI) dispersible isocyanate adducts were prepared by introducing ionic pendant groups and characterized by FT-IR, gel permeation chromatography (GPC), differential scanning calorimeter (DSC) and thermo-gravimetric analyses (TGA) techniques. It was found that molecular weights of MDI-based polyisocyanates were higher. Thermal studies showed that the de-blocking temperature of the isocyanate adducts decreases in the order: ε-caprolactam > methyl ethyl ketoxime > DMP. Gelation test was conducted by using the isocyanate adducts with hydroxyl functional aqueous polyurethane dispersion. It was also found that the dispersions of blocked adducts are stable and compatible with polyurethane (polyether and polyester based) and acrylic dispersions.

Original languageEnglish
Pages (from-to)71-79
Number of pages9
JournalProgress in Organic Coatings
Volume48
Issue number1
DOIs
Publication statusPublished - 2003 Nov

Bibliographical note

Funding Information:
This research was supported by the Korea Institute of Science and Technology Evaluation and Planning (National Research Laboratory Program, Project No. M19911000044). The authors thank the Kolon Chemicals, South Korea, for partial financial assistance.

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Surfaces, Coatings and Films
  • Organic Chemistry
  • Materials Chemistry

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