Repair of plastic substrates utilizing powder coating compositions
AssigneeGenCorp Inc.
InventorsBurr L. Leach, David Hawkins
Life of this patent
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Abstract
A process for repairing surface defects in plastic articles, especially plastic articles formed from fiber reinforced thermosetting resins, includes the steps of applying a powder coating composition to a defective area on the surface of a plastic article, curing the applied powder coating composition through the application of heat, and removing excess cured powder coating composition from the area of the defect to conform the area of the defect to the proper contours of the plastic article. The process can be utilized for repairing surface defects such as porosity, scratches, gouges and sand-through areas of cured thermoset substrates such as automotive body panels formed from sheet or bulk molding compounds.
Claims18
A process for repairing a surface defect in a plastic article molded in a mold cavity, comprising:
- applying a thermosettable powder coating composition to an area of a plastic article, which area includes a surface defect,
- curing the applied powder coating composition through the application of heat,
- and removing excess cured powder coating composition from said area to which said powder coating composition was applied and cured to conform said area to the shape of the mold cavity used to form the molded plastic article.
A process for repairing a surface defect in a plastic article formed from a fiber reinforced thermosetting resin, comprising:
- smoothing an area of a plastic article, which area includes a surface defect, to remove rough and jagged features,
- preheating said area which includes a surface defect to a temperature above the cure temperature of a subsequently applied powder coating composition,
- applying a thermosettable powder coating composition to the heated area which includes a surface defect,
- curing the applied powder composition by applying heat to maintain the powder coating composition at temperature and for a period of time sufficient to cause curing of the applied powder coating composition,
- allowing the cured powder coating composition to cool to about room temperature, and
- removing excess cured powder coating composition from the area to which said powder coating was applied and cured to conform the area of the defect to the shape of the mold cavity used to form the molded plastic article.
A process for repairing a surface defect in a plastic article molded in a mold cavity, comprising:
- smoothing an area of the plastic article, which area includes a surface defect, to remove rough and jagged features,
- preheating said area to a temperature above the cure temperature of a subsequently applied powder coating composition,
- applying a thermosettable powder coating composition to said preheated area,
- curing said applied powder coating composition through the application of heat,
- and removing excess cured powder coating composition from said area to which said powder coating composition was applied and cured to conform said area to the shape of the mold cavity used to form the molded plastic article.
Dependencies are inferred from the claim text.