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US 5,344,751 AGranted
Antistatic coatings
AssigneeMinnesota Mining and Manufacturing Company
InventorRobert L. Carlson
Life of this patent
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Abstract
A coating of a mixture of sodium metasilicate together with a silica sol and a silane coupling agent provides antistatic protection when overcoated with a gelatin containing photographic construction.
Claims19
A method for providing an antistatic protection layer onto a substrate comprising:
- a) preparing a coating composition in an aqueous medium of a colloidal silica, alkali metal metasilicate, and a coupling agent for said colloidal silica, said coating composition containing a colloidal silica to alkali metal metasilicate ration of 0.5/1 to 8.5/1 by weight;
- b) applying said composition to said substrate;
- and
- c) drying said composition to form an antistaic protection layer having a thickness of from 25 to 1000 nm.
1 more element
Dependencies are inferred from the claim text.