Nova Patents
GB2464706A

Antibacterial composition

Abstract

An antibacterial composition comprises 0.5-2.5% ionic silver incorporated into a material suitable for lining a water tank, such as a polyurethane, epoxy resin, polysulphide or vitreous enamel. The composition may be applied as a 25-75 micron layer to the internal surfaces of the tank and may prevent growth of Legionella pneumophila. Silver ions may also be incorporated in an amount of 0.5-2.5% into nylon microfilaments. The microfilaments are preferably provided as loose coils, which may be retained within blocks intended for insertion into water tanks.

GB2464706A, drawing sheet 1
Sheet 1 of 3

Term

Projected expiry 22 October 2028.

  1. Priority and filed
  2. Published
  3. Today
  4. Projected expiry

3 claims: 3 independent, 0 dependent

  1. 1
    The ionic silver preparation is added to the above tank coating formulations as a powder or in solution depending on the chemical and physical nature of the formulation and mixed using attrition or surface deposition techniques. The concentration added, within the range 0.5 - 2.5% is dependent on the hardness of finish of the tank lining’ materials.
  2. 2
    Site Applied Tank Coatings:An ionic silver preparation is incorporated at concentrations between 0.5 and 2.5% into the base part of two part epoxy resins compliant with BS6920 and mixed and applied in accordance with standard procedures for epoxy resin applications.
  3. 3
    Antimicrobial Tank Inserts:Tank inserts are constructed of plastic mesh in rectangular blocks with a depth of 50 to 100mm allowing water to flow through and contain loose coils of nylon microfilaments incorporating an ionic silver preparation at concentrations between 0.5 and 2.5%. The ionic The dimensions of the rectangular blocks may be variable but conform to standard cold water storage tank dimensions in units which allow a good fit into tiie tanks. Drawing I. Showing the position of antimicrobial tank inserts in cold water storage tanks (not to scale) The ionic silver is incorporated into the nylon by premixing using standard mixing techniques prior to extrusion. The lengths of microfilament filling the inserts is dependent on the volume of the tank and maximum throughput .of water in order to obtain maximum contact between contaminants and the surface area of the microfilament. Drawing 2 Showing schematically the structure of the mesh tank insert (not to scale) Sediment settling on the bottom and adhering to the sides of the tank will be in maximum contact with the antimicrobial tank lining. Due to the position of the tank inserts, resting on the bottom of the cold water storage tanks, all settling sediment will make contact with the microfilaments during settling. As water flows through the tank disturbing the sediment multiple contacts will be made between the sediment and themicrofilaments. Combination of contact with the tank lining and the microfilament insert blocks will ensure sufficient contact time with the infective agents to significantly reduce the numbers of viable microorganisms.
Independent claims3