Waterborne oil-modified polyurethane coatings via hybrid miniemulsion polymerization
✍ Scribed by J. W. Gooch; H. Dong; F. J. Schork
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 172 KB
- Volume
- 76
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
As part of a wider effort to develop a new class of waterborne coatings, hybrid miniemulsion polymerization was carried out with acrylic monomers (methyl methacrylate, butyl acrylate, and acrylic acid) in the presence of oil-modified polyurethane resin. Latexes with different ratios of resin to acrylic monomers were synthesized. The monomer emulsions prepared for hybrid miniemulsion polymerization showed excellent shelf-life stability (Ͼ5 months) and the polymerization was run free of coagulation. Solvent extraction indicated that the grafting efficiency of polyacrylics was greater than 29% for all the samples produced. A 13 C solution NMR spectrum showed that a substantial fraction of the original carbon double bonds (Ͼ61%) in oil-modified polyurethane remained after polymerization for film curing. Films obtained from the latexes presented good adhesion properties and fair hardness properties.