Powder coating compositions
AssigneeCourtaulds Coatings (Holdings) Limited
InventorsJohn Ring, Stephen Paul Cassidy, Andrew George Cordiner, Andrew Robert Morgan, Timothy Marc Handyside, John David Sinclair-Day
Life of this patent
Estimating the term…
Abstract
A powder coating composition, suitable for providing a coating having certain appearance or performance attributes, which includes composite particles that are agglomerates of individual particulate components fused or bonded together into composite particles such that the composite particles are air-fluidizable and can be applied to a substrate by electrostatic spray without causing the individual particles in the composite particles to break down under the mechanical and/or electrostatic forces associated with their application to a substrate.
Claims20
A powder coating composition for providing a coating having certain appearance or performance attributes, which comprises composite particles that are agglomerates of individual particle components that have been fused or bonded together into composite particles which are air-fluidisable and do not break down under the mechanical and/or electrostatic forces encountered during their application to the substrate, wherein said individual particulate components, present as discrete particles within the composites, comprise a first, solid, film-forming particulate component and one or more additional, solid, particulate components that differ from said first particulate component, each particle of said first component comprising a solid polymeric binder system at least a portion of which is a film-forming resin in an amount sufficient to impart film-forming properties to the composition, the particles of said additional component(s) containing at least one substance that provides, together with said first, film-forming, component, said certain appearance or performance attribute to said coating when processed into a coating with said first component, the identities, particle sizes and proportions of the components in the composition being selected such that, when the composition is applied to a substrate and heated to form a continuous coating, a film having the certain appearance or performance attribute is formed, with the proviso that, if the additional particulate component is a metallic or lustre appearance component and said first particulate component is fluidisable, the powder coating composition also contains as discrete particles within the composites at least a non-film-forming particulate performance component or a film-forming particulate appearance or performance component that is immiscible with said first film-forming component.
A powder coating composition for providing a coating having certain appearance or performance attributes, which comprises composite particles that are agglomerates of individual particulate components that have been fused or bonded together into composite particles which are air-fluidisable and do not break down under the mechanical and/or electrostatic forces encountered during their application to the substrate, wherein said individual particulate components comprise a first, solid, film-forming component and one or more additional, solid, components that differ from said first component, each particle of said first component comprising a solid polymeric binder system at least a portion of which is a film-forming resin in an amount sufficient to impart film-forming properties to the composition, the particles of said additional component(s) containing at least one substance that provides, together with said first, film-forming, component, said certain appearance or performance attribute to said coating when processed into a coating with said first component, the identities, particle sizes and proportions of the components in the composition being selected such that, when the composition is applied to a substrate and heated to form a continuous coating, a film having the certain appearance or performance attribute is formed, wherein said additional component(s) is (are) selected from the group consisting of (i) film-forming components that differ in composition and/or in particle size from said first film-forming component, (ii) non-film-forming additives selected from the group consisting of impact-resistance additives, friction-reducing additives, reinforcement fillers, microcapsules, abrasive materials, catalysts, fungicides, enzymes, intumescent pigments, and thermochromic pigments, tribocharging additives, and corona-charging additives, and (iii) non-film-forming additives selected from the group consisting of colouring pigments, roughening agents, conventional gloss-reducing agents, and fillers/extenders.
Dependencies are inferred from the claim text.