Method of touching up surface-blemished matt-finished surface grained colored molded plastic parts

Abstract

Surface finish blemishes in "color coded" surface grained parts injection molded from colored plastic can be removed by spraying the blemished surface area of the part with a sprayable mixture comprised of (a) a substantially non-yellowing, solvent-soluble generally transparent, binder resin in the amount of about 2-10%, (b) a finely divided flatting pigment which is generally transparent when suspended in said resin, the amount of said pigment being about 0.4-1%, and (c) about 90-95% of a volatile solvent medium effective to dissolve said resin without destroying the surface grain of the part when sprayed thereon, thereby to cover the blemished area with at least one coating of a transparent, matt-surfaced solid film of flatting pigment dispersed in said resin which coating blends substantially completely uniformly with the original matt finish of said part. Where the part is molded of a plastic which is solvent-resistant such as polyethylene or polypropylene, a chlorinated polyolefin resin is added in the amount of about 0.2-2% and sufficient to promote adhesion to said surface, such polyolefin resin being compatible with said binder resin and soluble in said solvent medium at least prior to evaporation of the latter.

Dependencies are inferred from the claim text.