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This invention describes a system for delivering fragrance in fabric care products. It uses tiny, positively charged, hydrophobic nanoparticles containing a fragrance, which are then encased within larger, moisture-sensitive microparticles. When added to laundry products, the charged nanoparticles help the fragrance stick better to fabrics, and the system can either release the scent slowly over time or provide a strong burst when ironed. The claims specifically focus on using certain quaternary ammonium salts or imidazolinium compounds to create the positive charge.
Why it matters: Filed before significant advancements in nanotechnology and polymer science made precise control over particle size, surface chemistry, and encapsulation more feasible and scalable. These developments could now enable more efficient and cost-effective manufacturing of such multi-component systems.
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