Antistatic powder coating compositions and their use
AssigneeE. I. Du Pont de Nemours and Company
InventorsPeter Gottschling, Zbigniew Stachyra, Maria Strid
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Abstract
This invention relates to a powder coating composition comprising a mixture of conventional, possibly coloured, non-conductive thermosetting powder coating compositions with highly conductive thermosetting powder coating compositions so as to produce a coating having an electrical surface resistance of less than 1010 Ω (ohm), preferably of less than 108 Ω (ohm), and to the substrates coated therewith. This invention also relates to using a mixture of non-conductive and conductive powder coating compositions to produce a coated surface having an electrical surface resistance sufficiently low to possess antistatic properties.
Claims17
A powder coating composition comprising a mixture of
- at least one conductive thermosetting powder coating composition comprising at least one conductive filler selected from carbon black, and
- at least one non-conductive thermosetting powder coating composition comprising a non-black color;
- wherein the weight ratio of the at least one conductive thermosetting powder coating composition to the at least one non-conductive thermosetting powder coating composition is between 2.5 to 95 and 95 to 2.5;
- wherein said powder coating composition produces a coating having an electrical resistance of less than 1010 ohm.
A light colored powder coating composition comprising a mixture of
- at least one conductive thermosetting powder coating composition comprising at least one conductive light colored inorganic pigment selected from metal oxides, non-metal oxides, conductively coated barium sulphate, conductively coated potassium titanate, doped tin dioxide, doped zinc oxide, metal oxide coated mica platelets, and mixtures thereof;
- and
- at least one non-conductive thermosetting powder coating composition;
- wherein the weight ratio of the at least one conductive thermosetting powder coating composition to the at least one non-conductive thermosetting powder coating composition is between 2.5 to 95 and 95 to 2.5;
- wherein said powder coating composition produces a light-colored coating having an electrical resistance of less than 1010 ohm.
A process for preparing a powder coating composition comprising mixing at least one conductive thermosetting powder coating composition comprising at least one conductive filler selected from carbon black with at least one non-conductive thermosetting powder coating composition comprising a non-black color;
- wherein the weight ratio of the at least one conductive thermosetting powder coating composition to the at least one non-conductive thermosetting powder coating composition is between 2.5 to 95 and 95 to 2.5.
Dependencies are inferred from the claim text.