Antistatic coating comprising tin-oxide-rich pigments and process and coated substrate
First Claim
1. An antistatic coating composition consisting essentially of a pigment portion dispersed in a binder portion, the binder portion containing a curable film-forming binder, the pigment portion containing tin oxide-rich electrically-conductive pigment blended with an electrical conductivity-enhancing proportion of hard impalpable, achromatic filler mineral, the proportion of said binder relative to the solids of said pigment portion being sufficiently high to provide a binder-continuous film when said composition is deposited and cured as a film on a substrate.
2 Assignments
0 Petitions
Accused Products
Abstract
An improved binder-continuous, curable composition is disclosed. It comprises a pigment portion dispersed in a curable film-forming fluent portion, the pigment portion containing a tin oxide-rich electrically-conductive pigment in a pigment blend comprising an electrical conductivity-enhancing proportion of hard impalpable, achromatic filler mineral. Also disclosed are: an improvement in process for involving the plural coating a surface of a substrate, the topcoating being antistatic and containing an opacifying pigment mixture comprising an electrically-conductive tin oxide-rich pigment; and the resulting coated article. The process comprises applying at least one undercoat to said surface, the uppermost undercoat exhibiting objectionable coloration and having electrical resistance when alone and cured that is at least as low as that of said antistatic topcoating when alone and cured, applying said opacifying antistatic coating as the topcoat, and curing the said uppermost undercoat and said topcoating.
-
Citations
36 Claims
- 1. An antistatic coating composition consisting essentially of a pigment portion dispersed in a binder portion, the binder portion containing a curable film-forming binder, the pigment portion containing tin oxide-rich electrically-conductive pigment blended with an electrical conductivity-enhancing proportion of hard impalpable, achromatic filler mineral, the proportion of said binder relative to the solids of said pigment portion being sufficiently high to provide a binder-continuous film when said composition is deposited and cured as a film on a substrate.
-
8. An antistatic coating composition consisting essentially of a binder portion in which a pigment portion is dispersed,
the binder portion including a curable film-forming binder in sufficient amount for providing a binder-continuous film when the composition is deposited and cured on a substrate, the pigment portion comprising a mixture of antimony oxide-doped, tin oxide-rich electrically-conductive pigment and an electrical conductivity-aiding proportion of tabular alumina, there being a sufficient amount of said mixture in the composition for imparting to a resulting applied and cured film of said composition a resistance between about 2.5× - 104 and 109 ohms.
- View Dependent Claims (9, 10, 11)
-
12. In a process for coating a surface of a substrate with a curable film-forming, binder-continuous antistatic coating having an electrically-conductive tin oxide-rich pigment as a fraction of its pigment blend, said blend rendering the antistatic coating when cured substantially opaque, the improvement which comprises:
-
applying to said surface at least one curable undercoat, the uppermost undercoat exhibits an undesired coloration and electrical resistance when cured that is at least as low as that of said antistatic coating; applying said antistatic coating as a topcoat over said uppermost undercoat; and curing said uppermost undercoat and said topcoat in place. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
- 23. A substrate having a surface coated with a cured, binder-continuous film of antistatic coating as a topcoat that has an electrically conductive, tin oxide-rich pigment as a fraction of its pigment blend, said blend rendering the cured coating substantially opaque the coated surface being characterized by having at least one cured undercoat beneath said antistatic topcoat coating, the uppermost of said undercoats exhibiting undesired coloration and electrical resistance that is at least as low as that of said antistatic topcoat coating.
-
34. In a process for coating a surface of a substrate with a curable film-forming, binder-continuous antistatic coating having an electrically-conductive tin oxide-rich pigment as a fraction of its pigment blend, the improvement comprising:
-
applying to said surface at least one curable undercoat that has electrical resistance when cured that is at least as low as that of said antistatic coating when cured; applying said antistatic coating as a topcoat over said uppermost undercoat; and curing said uppermost undercoat and said topcoat in place. - View Dependent Claims (35)
-
-
36. An antistatic floor coating composition consisting essentially of a tin oxide-rich electrically conductive pigment and electrical conductivity enhancing particles of hard, impalpable, achromatic filler selected from the group consisting of tabular alumina, corundum, quartz, garnet, spinel or mixture thereof, said pigment and filler particles being dispersed in a curable film-forming binder.
Specification