Durable antistatic coating for polymethylmethacrylate
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorsVaclav Hadek, Robert B. Somoano, Alan Rembaum
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Abstract
A durable antistatic coating is achieved on polymethylmethacrylate plastic without affecting its optical clarity by applying to the surface of the plastic a low molecular weight solvent having a high electron affinity and a high dipole moment such as acentonitrile or nitromethane alone or in the presence of photopolymerizable monomer. The treated polymethylmethacrylate plastic can then dissipate most of the induced electrostatic charge and retains its optical clarity. The antistatic behavior persists after washing, rubbing and vacuum treatment.
Claims8
A method of providing a durable, optically clear, transparent, antistatic coating on the surface of a transparent solid polymethacrylate article comprising the steps of:
- applying to the surface of the article at a temperature of no more than 40.degree. C a low molecular weight, polar, organic solvent having high electron affinity selected from the group consisting of nitromethane or acetonitrile, to form an antistatic coating comprising a surface layer of said article having at least 0.05% by weight of said solvent retained therein;
- and
- drying said surface.
Dependencies are inferred from the claim text.