| 摘要 |
A face mask comprising a filter material being a fibrous substrate, especially non-woven polypropylene or polyester, having an acidic polymer, especially of the Carbopol or Gantrez type, deposited on the the fibres. The mask has an anti-viral activity against inhaled or exhaled air. A filter material suitable for such a mask, and a process for making it are also described.
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