Coating powders having enhanced electrostatic chargeability
AssigneeAlpha Coating Technologies, LLC
InventorJeno Muthiah
Life of this patent
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Abstract
Inert nitrogen-containing compounds, such as melamine, urea, dicyandiamide, and benzoguanamine and derivatives of such compounds are added to thermosetting resin powder coatings to enhance the electrostatic charge of the powders. Such enhancement improves coating processes for non-conductive and conductive substrates.
Claims47
A coating powder consisting essentially of an inert nitrogen-containing compound which is a member selected from the group consisting of melamine, urea, benzoguanamine, derivatives of melamine, derivatives of urea, and derivatives of benzoguanamine, said compound being present in an effective amount to enhance the electrostatic chargeability of said coating powder, balance essentially a thermosetting resin polymer.
A coating powder consisting essentially of about 5 to about 20 parts by weight, based upon 100 parts by weight of thermosetting epoxy resin polymer of melamine, balance essentially a thermosetting epoxy resin capable of curing at a temperature below about 300° F.
A process for coating a non-conductive substrate comprising:
- a) Providing a coating powder consisting essentially of an inert nitrogen-containing compound which is a member selected from the group consisting of melamine, urea, benzoguanamine, derivatives of melamine, derivatives of urea, and derivatives of benzoguanamine, said compound being present in an effective amount to enhance the electrostatic chargeability of said coating powder, balance essentially a thermosetting resin polymer;
- b) Applying an electrostatic charge to said coating powder;
- c) Contacting a non-conductive substrate with said electrostatically charged powder to form a powder coating on said substrate;
- and
- d) Curing said powder to form a cured coating on said substrate.
A powder coated article comprising a non-conductive substrate coated with a cured coating powder consisting essentially of an inert nitrogen-containing compound which is a member selected from the group consisting of melamine, urea, benzoguanamine, derivatives of melamine, derivatives of urea, and derivatives of benzoguanamine, said compound being present in an effective amount to enhance the electrostatic chargeability of said coating powder, balance essentially a thermosetting resin polymer.
A powder coated article comprising a non-conductive substrate coated with a cured coating powder consisting essentially of about 1 to 30 parts by weight, based upon 100 parts by weight of thermosetting epoxy resin polymer, of melamine, balance essentially a thermosetting epoxy resin polymer capable of curing at a temperature below about 300° F.
A coating powder consisting essentially of dicyandiamide in inert form, said dicyandiamide being present in an effective amount to enhance the electrostatic chargeability of said coating powder, balance essentially a thermosetting resin polymer which is a member selected from the group epoxies which do not contain a curing agent which catalyzes a curing reaction between said epoxies and dicyandiamide, saturated polyesters, polyester-epoxy hybrids, unsaturated polyesters containing a surface curing initiator, acrylics, epoxy functional acrylics, and admixtures thereof
A process for coating a non-conductive substrate, comprising
- a) Providing a coating powder consisting essentially of dicyandiamide in inert form, said dicyandiamide being present in an effective amount to enhance the electrostatic chargeability of said coating powder, balance essentially a thermosetting resin polymer which is a member selected from the group epoxies which do not contain a curing agent which catalyzes a curing reaction between said epoxies and dicyandiamide, saturated polyesters, polyester-epoxy hybrids, unsaturated polyesters containing a surface curing initiator, acrylics, epoxy functional acrylics, and admixtures thereof;
- b) Applying an electrostatic charge to said coating powder;
- c) Contacting a non-conductive substrate with said electrostatically charged powder to form a powder coating on said substrate;
- and
- d) Curing said powder to form a cured coating on said substrate.
A powder coated article comprising a non-conductive substrate coated with a cured coating powder consisting essentially of dicyandiamide in inert form, said dicyandiamide being present in an effective amount to enhance the electrostatic chargeability of said coating powder, balance essentially a thermosetting resin polymer which is a member selected from the group epoxies which do not contain a curing agent which catalyzes a curing reaction between said epoxies and dicyandiamide, saturated polyesters, polyester-epoxy hybrids, unsaturated polyesters containing a surface curing initiator, acrylics, epoxy functional acrylics, and admixtures thereof.
A process for coating a conductive substrate comprising:
- a) Providing a coating powder consisting essentially of an inert nitrogen-containing compound which is a member selected from the group consisting of melamine, urea, benzoguanamine, derivatives of melamine, derivatives of urea, and derivatives of benzoguanamine, said compound being present in an effective amount to enhance the electrostatic chargeability of said coating powder, balance essentially a thermosetting resin polymer;
- b) Applying an electrostatic charge to said coating powder;
- c) Contacting a conductive substrate with said electrostatically charged powder to form a powder coating on said substrate;
- and
- d) Curing said powder to form a cured coating on said substrate.
A process for coating a conductive substrate comprising:
- a) Providing a coating powder consisting essentially of a metal, said compound being present in an effective amount to enhance the electrostatic chargeability of said coating powder, balance essentially a thermosetting resin polymer;
- b) Applying an electrostatic charge to said coating powder;
- c) Contacting a conductive substrate with said electrostatically charged powder to form a powder coating on said substrate;
- and
- d) Curing said powder to form a cured coating on said substrate.
A powder coated article comprising a conductive substrate coated with a cured coating powder consisting essentially of an inert nitrogen-containing compound which is a member selected from the group consisting of melamine, urea, benzoguanamine, derivatives of melamine, derivatives of urea, and derivatives of benzoguanamine, said compound being present in an effective amount to enhance the electrostatic chargeability of said coating powder, balance essentially a thermosetting resin polymer.
A process for coating a conductive substrate, comprising
- a) Providing a coating powder consisting essentially of dicyandiamide in inert form, said dicyandiamide being present in an effective amount to enhance the electrostatic chargeability of said coating powder, balance essentially a thermosetting resin polymer which is a member selected from the group epoxies which do not contain a curing agent which catalyzes a curing reaction between said epoxies and dicyandiamide, saturated polyesters, polyester-epoxy hybrids, unsaturated polyesters containing a surface curing initiator, acrylics, epoxy functional acrylics, and admixtures thereof,
- b) Applying an electrostatic charge to said coating powder;
- c) Contacting a conductive substrate with said electrostatically charged powder to form a powder coating on said substrate;
- and
- d) Curing said powder to form a cured coating on said substrate.
A powder coated article comprising a conductive substrate coated with a cured coating powder consisting essentially of dicyandiamide in inert form, said dicyandiamide being present in an effective amount to enhance the electrostatic chargeability of said coating powder, balance essentially a thermosetting resin polymer which is a member selected from the group epoxies which do not contain a curing agent which catalyzes a curing reaction between said epoxies and dicyandiamide, saturated polyesters, polyester-epoxy hybrids, unsaturated polyesters containing a surface curing initiator, acrylics, epoxy functional acrylics, and admixtures thereof.
Dependencies are inferred from the claim text.