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weight of a polyester compound; a polyol; and a curing agent mixture.

UV-CURABLE POWDER COATINGS U.S. Patent 6,136,882. Oct. 24, 2000 A.T. Daly et al., assignors to Morton International Inc., Chicago

A nonhazing UV-curable powder coating composition, which com- prises a film-forming particulate blend of an unsatura ted base res- in; an unsa tu r a t ed crosslinker

Electrodeposition: The Materials Science

of Coatings and Substrates byJ. W. Dini 367 pages $105.00

The first comprehensive book on materials science and its relationship to electrodeposi- tion and other coating technologies. Topics covered include hydrogen embri~tlement, adhesion, .diffusion, porosky, stress addi- tives, corrosion, and wear.

Send Orders to: METAL FINISHING

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Metals/Ions

He lent Chr ium

Impurities

ResearchiConsu Ration

DR. KATE LUK

kkt@rti.org ~,,

Research Triangle Institute ~ Research Triangle Park, NC www. r t i .o rg

Circle 034 on reader card or go to www.thru.to/webconnect

resin copolymerizable with the base resin; and a photoinitiator, wherein the composition further comprises a recrystallization or haze inhibitor.

CATIONIC ELECTROCOATING COMPOSIT ION U.S. Patent 6,136,895. Oct. 24, 2000 T. Koyama et al., assignors to Nippon Paint Co. Ltd., Osaka-fu, Japan

Circle 033 on reader card or go to www.thru.to/webconnect

A cationic electrocoating composi- tion comprising an acrylic resin functioning as a leveling agent; a base resin; and a cross-linking agent.

ROTARY SURFACE TREATMENT TOOL U.S. Patent 6,138,317. Oct. 31, 2000 D.S. Holmes and D.C. Rocker, assignors to 3M Innovative Properties Co., St. Paul, Minn.

A rotary brush comprising a gen- erally planar base having a drive side for a t tachment to a rotational driver and a bristle side, the base defining an axis of rotation; and a plurality of individual bristles ex- tending from the bristle side.

DIFFERENTIAL DOWNDRAFT CONTROL FOR A PAINT SPRAYBOOTH U.S. Patent 6,139,421. Oct. 31, 2000 E.H. Tong and Y.N. Liu, assignors to Ford Global Technologies Inc., Dearborn, Mich.

A paint spray cell and air plenum assemble compr i s ing a pa in t spray cell having a perforate air inlet wall occupying at least a substantial portion of one side of the cell and having at least one electrostatic paint sprayer to di- rect charged spray particles along a desired path into a ~ receptive target; a plenum having an undi- vided air supply and an outlet joined to said cell inlet to admit said air uniformly there through; and variable density filter media at said plenum outlet to create differential velocity flows through said inlet wall tha t affect paint particles differently in different locations to both optimize paint transfer efficiency to said target and reduce paint particle adher- ence to objects other than the tar- get.

8 0 Metal Finishing