Bio-based antimicrobial coating CareCoatex™


PolyU has developed a patented core-shell nano-particle (CareCoatex™), an international award-winning bio-based antimicrobial coating for a wide range of applications. It is eco-friendly, bio-based and has long-lasting anti-bacterial and anti-viral properties, and is engineered with ultra-high rub resistance providing prolonged protection . This technology has been commercialised through PolyU academic-led start-up Grand Rise Technology Co., Ltd.

  • Bio-based antimicrobial coating CareCoatex™ 0
  • Bio-based antimicrobial coating CareCoatex™ 1
  • Bio-based antimicrobial coating CareCoatex™ 2
Technical name of innovation
Core-shell particle technology platform InnoCoatex™
Commercialisation opportunities
IP licensing, Collaboration for technology development in various application segments, Product distribution
Problem addressed

Grand Rise Technology Co., Ltd. focuses on the research and application of biopolymer materials, is committed to developing new material technology solutions that are more environmentally friendly, safer and sustainable for human body and environment. We had developed long-term antibacterial coatings suitable for different materials and harmless to human body and environment.

  • Our technology was revolutionary because we managed to combine two incompatible layers in one particle, so that the end product is amphiphilic – having both water- and oil-based components.
  • After the spray is applied, water evaporates and the oil-based cores would fuse together forming a durable coating.
Key impact
  • Bio-based antimicrobial coating, CareCoatex™ , a non-toxic and eco-friendly spray and wet wipes that kills 99% of common bacteria such as Staphylococcus aureus, and viruses like H1N1 and HCOV-229E (COVID-19). The coating offers not only contact killing, but also time-release action for as long as 6 months.
  • Besides high-touch surfaces like doorknobs, elevator buttons, and medical devices, it can be sprayed on fabric and clothing items, or even used in antiseptic wipes.
  • Gold Medal at the Special Edition 2021 Inventions Geneva Evaluation Days
  • China Functional Nanomaterials Best Investment Value Award 2021 First Prize at CHInano 2021 Conference & Expo.
  • Alibaba Entrepreneurs Fund/HSBC JUMPSTARTER 2022 Environmental Impact Award
  • Antimicrobial Coating
  • Antimicrobial Textiles
  • Antimicrobial Paper


  • US Patent: 8,993,065 B2
The Hong Kong Polytechnic University (PolyU)

With over 80 years of proud tradition and ranking among the world’s top 100 institutions, The Hong Kong Polytechnic University (PolyU) aspires to be a leading university with world-class research and education.

PolyU is a home for educating thinkers, discoverers, innovators and communicators in delivering positive impact. We are committed to nurturing tomorrow’s leaders today, through a holistic education that provides graduates unrivaled placements to thrive in communities, industries and businesses.