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Durable antistatic coating for polymethylmethacrylate
| Details |
Inventors: Hadek, Vaclav; Somoano, Robert B.; Rembaum, Alan;
Assignee: The United States of America as represented by the Administrator of the (Washington, DC)
Primary Examiner: Smith; Ronald H.
Assistant Examiner: Silverberg; S.
Attorney, Agent or Firm: Mott; Monte F., Grifka; Wilfred, Manning; John R.
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. |
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DETAILED DESCRIPTION What is claimed is: 1.
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.
2.
A method according to claim 1 in which the article is a solid polymeric methacrylate ester selected from methyl, ethyl, propyl, butyl, or mixtures thereof.
3.
A method according to claim 2 in which the solid polymeric ester is a polymethylmethacrylate.
4.
A method according to claim 1 in which the article contains at least 0.
1% by weight of the solvent.
5.
A method according to claim 1 in which the solvent is applied at room temperature.
6.
A method according to claim 5 in which the solvent is applied to the article by immersion of the article in the solvent.
7.
A method according to claim 1 in which the solvent is acetonitrile.
8.
An article produced according to the method of claim 1.
Description:
BACKGROUND OF THE INVENTION 1.
Field of the Invention The present invention relates to surface treatment of plastics and, more particularly, to the formation of a durable antistatic coating on the surface of acrylic resins such as polymethylmethacrylate.
2.
Description of the Prior Art A very desirable property is exhibited by solid acrylic polymers, such as crystal clarity, high impact strength, formability, and resistance to sunlight and weather in most chemicals has led to widespread use in military and civilian applications, especially since these polymers have become available in transparent, translucent and brightly colored forms.
Acrylic sheet is the standard transparent material for canopies, windows, instrument panels, searchlight and landing light covers on aircraft
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