lyte, a reactor electrolyte, and a catholytefor conversion of salts of ferrous ions andstannous ions in an acidic solution intoinsoluble hydroxides and separating theferrous ions from the stannous ions andreturning the stannous ions to the acidicsolution.

Spot-Resistant GlossEnhancement of AutodeposltlonCoatingu.s. Patent 5,786,030. July 28, 1998B.M. Ahmed et al., assignors to Henkel Corp.,Plymouth Meeting, Pa.

A process for producing a glossy coatingon a metal substrate by autodepositioncomprising contacting a wet autodepositedcoating on the metal substrate with anaqueous liquid composition; maintainingthe contact established for a sufficient timeto transfer some iron cations from the wetautodeposited coating into the aqueous liq•uid composition; and thereafter separatingthe wet autodeposited coating from the vol•ume of aqueous liquid composition.

Basecoat Compositionu.s. Patent 5,786,033. July 28, 1998A. Gast et al., assignors to BASF Lacke +FarbenAG, Muenster-Hi/trup, Germany

A method of forming multilayer paintfilms on a substrate comprising applying abasecoat composition, which is aqueousand contains pigment; applying a transpar•ent topcoat over the basecoat; and bakingthe basecoat and the topcoat at the sametime; wherein the basecoat compositioncomprises an aqueous polyurethane resin.

Method for Painting MetalPlatesu.s. Patent 5,786,037. July 28, 1998E. Vergani, Camate (Milano), Italy

A method of painting a metallic piece inthe form of a metal plate or section com•prising pretreating so as to cause a powderpaint to adhere to the surface; distributing afIrst layer of a powder paint on the surface;inserting into an oven to melt the fIrst layerof powder paint; maintaining in the oven ata preset temperature for a fIrst time periodsufficient for the powder to begin polymer•ization; immediately after the beginning ofpolymerization removing from the ovenand thereby cooling the surface to stoppolymerization; depositing a second layerof a meltable polymerizable powder paintover at least part of the fIrst layer; andthereafter heating with fIrst and second lay•ers of the powder paint to a fInal tempera•ture and maintaining for a second timeperiod effective and sufficient for completepolymerization of the fIrst and second lay•ers of the powder paint.

Abrasive Nonwoven Webu.s. Patent 5,786,065. July 28, 1998V.R. Annis et al., assignors to The Dexter Corp.,Windsor Locks, Conn.

A single-phase, absorbent, abrasive non•woven fIbrous web material containingnodulated fIber remnant particles of a ther•moplastic composition, substantially allparticles within the web being nodulatedthroughout the thickness of the webwhereby none have retained a physical fI•ber form and appearance.

Matte Powder CoatingCompositionu.s. Patent 5,786,419. July 28, 1998H-U. Meier-Westhues et al., assignors to Bayer AG,Leverkusen, Germany

A powder coating composition for theproduction of matte coatings comprising ahydroxyl group-containing component; anaddition polymerization compound, whichis based on aliphatic and/or cycloaliphaticdiisocyanates, contains uretdione groupsand optionally free isocyanate groups; acomponent, which contains carboxyland/or carboxylic acid anhydride groups;and a component, which contains groupsreactive with carboxyl and/or carboxylicacid anhydride groups.

Thermosetting Powder CoatingCompositionu.s. Patent 5,786,430. July 28, 1998A. Kaplan et al., assignors to EMS-Inventa AG,ZOrich, Switzerland

A thermosetting powder coating composi•tion comprising at least one glycidic ether•containing copolyester, which is amorphous,semicrystalline, or a mixture of amorphousand semicrystalline copolyesters; a curingagent selected from the group consisting of atleast one aliphatic polybasic acid, cy•cloaliphatic polybasic acid, anhydride of thealiphatic polybasis acid, anhydride of the cy•cloaliphatic polybasic acid, polyol-modilledanhydride of a polybasic acid, amorphous orsemicrystalline carboxyl functional copolyes•ter resin, carboxyl-functional acrylate resin,and a mixture thereof; optionally, at least oneof a fIller, a pigment, another additive, or amixture thereof.

Anodic Coating Defects'- Their Causes and Curesby A. w: Brace

168 pages $150.00

1bis book provides guidelines and examples for troubleshooting defects in anodic coatings. Chapterone outlines an approach to identifying a defect. Each of the remaining 12 chapters covers one groupof defects, such as those arising in the etching process described in Chapter 4. Here one frnds a photoand description of each defect (for instance, frne pitting) with a remedy for curing it; a simple andstraightforward approach to problem-solving.

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METAL FINISHING. DECEMBER 1998 79