VOC-Free Waterborne Polyurethane Epoxide Resin and Crosslinker for Producing Tough and Flexible Coatings (RFT-154/154A)
Scientists at North Dakota State University have developed a polyfunctional waterborne Glycidyl Carbonate (GC) resin, comprising oligomers that provide polyurethane properties with epoxide reactivity. These compounds can be dispersed in water to form a dispersion containing no volatile organic solvent. The tough and flexible coatings produced using this material have high hardness and durability as well as high gloss. A particularly promising application is to use GC crosslinkers as a very minor ingredient in lubricious and other "fragile" coatings, where it provides substantially increased strength with minimal impact on other properties. A commercial advantage of this resin is not having isocyanate water reactions, or isocyanate toxicity concerns, but having controlled and safer reactions with amines or other reactive functionality.
- May be used as a resin or crosslinker
- Very small amounts dramatically increase hardness and durability without negatively impacting lubricity
- Excellent water resistance, solvent resistance, and flexibility
- Ambient cure temperature
- No VOCs
- Transparent, with no phase change or haziness
- High gloss
The technology is a waterborne, solvent-free glycidyl carbamate resin. These resins are produced by reaction of an isocyanate functional resin with glycidol, resulting in a GC product that includes urethane and epoxy functional groups. Aliphatic polyisocyanate is made water dispersible by additions of mPEG, and end capped with glycidol to produce glycidyl functionality that crosslinks. These may then be crosslinked by reaction with amines, or may self-crosslink at elevated temperature.
This technology is patented in the U.S. (issued US patents 7,776,956 and 9,676,895) and is available for licensing/partnering opportunities.
Supporting Patents and Publications that describe RFT-154 usefulness:
- U.S. Patent No. 9,714,361, "Oxirane (Ethylene Oxide) Polyurethane Coatings" (2017).
- U.S. Patent No. 9,623,157, “Modified hyaluronate hydrophilic compositions, coatings, and methods,” (2017).
- "Novel Water Dispersible Glycidyl Carbamate (GC) Resins and Waterborne Amine-Cured Coatings" J. Coat. Tech. Res., 6, 735-747 (2011),
- "Novel Water Loving Coatings (WLC) Lubricous and Durable Guidewires", Proceedings of the 2017 Design of Medical Devices Conference DMD2017-3434, (April 10 - 13, 2017), respectively and
- "Focal Middle Cerebral Artery Ischemia in Rats via Transfemoral Approach Using a Custom-Designed Microwire". J. Neurointerv Surg., 8 (6) pp. 608-614.
Henry Nowak, Technology Manager
NDSURF Tech Key: 154, RFT154
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