Precipitation process for making polyvinylidene fluoride powder coatings and coatings made by the process
AssigneeSolvay Solexis S.p.A.
InventorsShiow-Ching Lin, Michelle Kelly, Bradley Kent
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Abstract
A process for making pigmented PVDF-based powder coatings by coagulation and powder based coatings made by the process. The process involves blending a PVDF latex and a water reducible acrylic polymer and pigment dispersion, adding coagulant to precipitate solid PVDF and pigment associated by ionic interaction with acrylic polymer binder, separating solids and drying the precipitate. Also, methods for coating substrates with the powder coating and coated substrates.
Claims27
A process for making a powder coating composition comprising the steps of blending a PVDF latex and a water reducible acrylic polymer phase having a water reducible acrylic polymer with ionic species and a pigment, adding coagulant to form a precipitate, separating the precipitate from water and drying the precipitate.
A powder coating composition comprising PVDF and a pigment dispersed in an acrylic polymer binder wherein the pigment and acrylic polymer associate by ionic interaction.
A method for coating a substrate comprising
- a) providing a substrate and a powder coating composition comprising PVDF and a pigment dispersed in an acrylic polymer binder wherein the pigment and acrylic polymer associate by ionic interaction,
- b) applying the powder coating composition to the substrate and
- c) heating the coated substrate to a temperature of about 200° C. to about 280° C.
Dependencies are inferred from the claim text.