| 摘要 |
<p>Nano-scale coating for container closures, comprises a non-porous polymerised silicon oxide layer containing active antibacterial substance in the form of deacetylated chitosans and chitosan derivatives, halogenated phenols and/or quat. ammonium salts, other than mixtures containing up to 50 wt% chitosan, alkylated or acylated chitosan and/or crosslinked chitosan. A nanoscale coating for container closures made of cork and/or glass, with a thickness of 50-300 (preferably 120-250) nm and containing a non-porous inorganic polymerised SiO 2 layer, also contains 0.1-50 (preferably 1-20) wt% active antibacterial substance (I) in the form of cationic, anionic or non-ionic deacetylated chitosans and chitosan derivatives and/or phenols selected from halogenated dihydroxydiphenyl-methanes, -sulfides and uethers and/or substituted quat. ammonium salts of alkylated phosphorus acids. This does not include mixtures containing up to 50 wt% chitosan, alkylated or acylated chitosan and/or crosslinked chitosan. Independent claims are included for (1) a method (M1) for the production of container closure coatings (CCC) as above by making a sol-gel with nano-scale particles using a known method involving hydrolysis of a suitable precursor in water and then adding (I) as a solution or dispersion in a hydrophilic solvent (2) a method (M2) for applying a composition prepared as in M1 to glass and/or cork substrates by contacting the surface, especially by spray-coating, dip-coating, spin-coating, painting, pouring on, film-coating or beam spraying with at least one spray jet (3) container closures coated with CCC to form a barrier against substances from the atmosphere and/or substances which are in direct contact with the closure and/or contained in or released from the closure .</p> |
