Abstract
Polyurethane is one of the most versatile polymeric materials and is found just about everywhere in modern life including coatings and adhesives in electronics and automobile interior. However, the conventional polyurethane is usually synthesized by a solvent-based process and causes serious environmental problems in use such as emission of volatile organic solvents. In recent years, environment-friendly polyurethane by a waterborne process has received great attention. Waterborne polyurethane adhesives (WPA) for automobile interior require high initial adhesion, heat-resistance, weatherability, and processability. However, it is difficult to satisfy processability during the coating process because of the heterogeneous system of waterborne polyurethane. Therefore, this study was focused on the improvement of processability by control of particle stability of WPA. The results showed that the particle stability of WPA was strongly affected by the nonionomer internal emulsifier.
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