Static dissipative composition

• US 4,895,886 A
• Filed: 11/09/1988
• Issued: 01/23/1990
• Est. Priority Date: 11/09/1988
• Status: Expired due to Fees

• Current Assignee: Armstrong World Industries Incorporated
• Original Assignee: Armstrong World Industries Incorporated
• Inventors: Musser, Deborah L., Felter, Richard E.
• Primary Examiner(s): Schofer, Joseph L.
• Assistant Examiner(s): Smith, Jefffrey T.
• Application Number:
  US07/269,056
• Time in Patent Office: 440 Days
• Field of Search: 524/156, 524/247, 524/913
• US Class Current: 524/247
• CPC Class Codes: C09D 7/80 Processes for incorporating ingredients
• CPC Class Codes: C09K 3/16 Anti-static materials
• CPC Class Codes: Y10S 524/913 Contains nitrogen nonreactant material

Abstract

A surface dissipative coating is provided of polymethylmethacrylate, choline methosulfate, long chain quaternary antistat, polyglycol monoethyl ether acetone, and fumed silica. A clear aqueous coating composition replaces polymethylmethacrylate with polyurethane. Surface resistivities of 10⁶ -10⁷ are obtained.

Claims

1. A method for preparing a non-aqueous antistatic coating composition to provide a composition that can be packaged as an aerosol spray, the said non-aqueous coating composition comprising (1) 1-1.5 parts of a choline antistat, (2) 1.6-2.4 parts of one or more long chain quarternary ammonium antistat, (3) 70-90 parts of a solvent vehicle, (4) a polymer binder, and (5) an inorganic particulate, with the parts by weight of (1)-(5) totalling to an amount in the range of from 87.1 to 123.9;

comprising the steps;

(a) dissolving the said choline antistat and the said long chain quarternary ammonium antistat in an alcohol to form a solution, and

(b) blending the solution formed in (a) and a mixture of an organic solvent, the said polymer binder dissolved in the organic solvent, and the said inorganic particulate, to form a storage stable composition wherein the 70-90 parts of the said solvent vehicle are provided by the alcohol and the organic solvent.

2. The method of claim 1 wherein the organic solvent is methyl ethyl ketone, methylisobutyl ketone and toluol and the alcohol is isopropanol.

3. The method of claim 1 wherein the inorganic prticulate is fumed silica.

4. The method of claim 1 wherein the inorganic particulate is fumed silica and TiO₂.

5. A method for preparing a non-aqueous antistatic coating composition which is an aerosol spray composition, the said non-aqueous coating composition comprising (1) 1-1.5 parts of a choline antistat, (2) 1.6-2.4 parts of one or more long chain quarternary ammonium antistat, (3) 70-90 parts of a solvent vehicle, (4) a polymer binder, and (5) an inorganic particulate, with the parts by weight of (1)-(5) totalling to an amount in the range of from 87.1 to 123.9;

comprising the steps;

(a) dissolving the said choline antistat and the said long chain quarternary ammonium antistat in an alcohol to form a solution,

(b) blending the solution formed in (a) and a mixture of an organic solvent, the said polymer binder dissolved in the organic solvent, and the said inorganic particulate, to form a storage stable composition wherein the 70-90 parts of the said solvent vehicle are provided by the alcohol and the organic solvent, and

(c) putting a propellant and the storage stable composition into an aerosol can to form the aerosol spray composition.

6. The method of claim 5 wherein the propellant in a non-photochemically active fluorocarbon.

7. The method of claim 5 wherein fumed silica and TiO₂ are used as the inorganic particulate.

8. The method of claim 5 wherein fumed silica is the inorganic particulate.

9. The method of claim 5 wherein the organic solvent is methyl ethyl ketone, methylisobutyl ketone and toluol and the alcohol is isopropanol.