Ppg Industries Ohio, Inc.

John C Reising

Richard S Tansey

Gregory J McCollum

Lan Deng

Paul W Bradley

Travis Owen Bush

Angela K Staufer

Ronald J Isger

Victor A Monroy

Stacie L Toothman

A powder coating composition can include: a polyester polymer comprising carboxylic acid functional groups; a crosslinker reactive with the carboxylic acid functional groups of the polyester polymer; and a thermoplastic fluoropolymer unreactive with the polyester polymer and crosslinker. The powder coating composition is substantially free of an isocyanate functional crosslinker.

Powder coating compositions and coatings formed therefrom

Composite coated metal and/or polymer substrates are provided having a powder basecoat thereon formed from at least one film-forming material comprising a thermosettable polyester and a curing agent; at least one reaction product of at least one cyclic carboxylic acid anhydride, at least one alkene and at least one reactant selected from the group consisting of primary amines, aliphatic polyamines, primary amino alcohols, alcohols, isocyanates and mixtures thereof, the copolymer having a number average molecular weight ranging from about 1,000 to about 20,000; and at least one flow control agent; and a topcoat deposited from a liquid or powder slurry topcoating composition applied over the basecoat to form a composite coating providing good adhesion and chip and cratering resistance.

Metal and polymer substrates having a powder basecoat and liquid topcoat

A process for applying a two-tone color effect coating to a substrate including applying an accent powder basecoating composition including film-forming material; reaction product as described herein; flow control agent; and first color effect additive, to a first predetermined portion of a surface of a substrate; at least partially curing the accent basecoating; applying a main liquid or powder basecoating composition having a different color effect additive to a second predetermined portion of the substrate, such that a portion of the accent basecoat is not contacted by the main basecoating composition; at least partially curing the main basecoating composition; applying a topcoating composition over the accent basecoat and main basecoat and curing the resulting composite coating, such that the first portion of the substrate has a different color effect than the second portion of the substrate to provide a two-tone color effect coated substrate.

Two-tone color effect coating process

A method of forming a composite coating is provided including (a) applying a first powder base coating to a substrate; and (b) either (1) applying a second powder base coating comprising flake or platelet effect pigment and heating the first and second base coats to substantially level the second base coat and allow migration of the effect pigment to a surface region thereof but not sufficient to cause the second base coat to cure; and (2) applying a top coating and substantially curing the resultant composite coating; or alternatively, (3) heating the first base coat to form a generally continuous film; (4) applying the second powder base coating comprising the effect pigment and heating the second base coat to substantially level the second base coat and allow migration of the effect pigment to a surface region thereof; and (5) applying the top coating and substantially curing the resultant composite coating.

Methods of forming composite coatings

A method of coating metallic substrates with weldable primer and at least one powder coating is provided by the present invention. The base powder coating contains flake pigments that align parallel to the surface when the powder coating is heated. Optionally, a clear top coating is applied over the base powder coating. Substrates coated by the method of coating are also provided. The method of coating allows substrates coated with weldable primer to be assembled into assemblies or finished parts by welding, and then to be coated with the powder basecoat and clear coat. The parts prepared have striking visual effects and performance comparable to conventional automotive parts but are prepared more efficiently and economically.

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North Ridgeville, OH, United States of America

John C Reising