ing composition to a substrate, and apply- ing a second thermosetting aqueous coating composition to the uncured coating surface of the first aqueous coating composition wherein the first aqueous coating composi- tion contains a base resin with a neutraliza- tion value of 20 to 30 KOH mg/g and the second aqueous coating composition con- tains a base resin with a neutralization value higher by 10 to 20 KOH mg/g than the base resin of the first aqueous coating composition.

Method of Replenishing Electroless Gold Plating Baths u.s. Patent 5,635,253. June 3, 1997 D.F. Canaperi et al., assignors to IBM Corp., Yorktown Heights, N. Y

A method of replenishing a cyanide- based electroless gold plating bath com- prising providing a cyanide-based electro- less gold plating bath having a source of gold including cyanide, a stabilizer, and pH adjuster, which maintains the pH of the bath between 11 and 14; depositing gold on a substrate using the bath, thereby remov- ing gold from the bath; providing a replen- ishing solution including a gold halide and

an alkali hydroxide, which reacts with the cyanide to form a gold halide-hydroxide complex including the cyanide, said re- plenishing solution having a pH between 8 and 14; determining the amount of gold removed from the bath; and adding a suf- ficient amount of the replenishing solution to the bath to replace the gold removed from the bath during the depositing step without increasing the free cyanide concen- tration level in the bath above the initial level in the bath.

Coating Resistant to Environmental Etch U.S. Patent 5,635,302. June 3, 1997 A.M. Budde et al., a,~signor',i', to BASF Corp., Southfield, Mich.

A coated article comprising a substrate having a cured coating thereon, wherein 75 to 100% of the polymer consists of residues of a sterically hindered monomer and an ethylenically unsaturated comonomer hav- ing a functional site for crosslinking during curing in amounts sufficient to produce a coating exhibiting enhanced environmental etch resistance; and fi.lrther wherein any

sterically hindered vinyl monomer residue is present in an amount of from 0 to 67%.

Powder Coating Composition U.S. Patent 5,635,548. June 3, 1997 K.J. Kittle and P.F. Rushman, assignors to Courtaulds Coatings (Holdings) Ltd., United Kingdom

A powder coating composition, which comprises at least one film forming poly- meric material and has dry-blended there- with two or more additives selected from the group consisting of solid, particulate, inorganic, water-insoluble materials, which may be ceramic or mineral materials and/or may be oxides, mixed oxides, hydrated ox- ides, hydroxides, oxide-hydroxides, or oxysalts of metals and metalloids, at least 95% by volume of the powder coating composition having a particle size not ex- ceeding 50 microns.

Aqueous Acrylic Paint u.s. Patent 5,635,549. June 3, 1997 J-F D'Allest et al., assignors to Rhone-Poulenc Chimie, Courbevoie Cedex, France

A vehicle for an aqueous emulsion/dis- persion acrylic paint, comprising 96 to

Pumps and Filter Systems

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114 METAL FINISHING • FEBRUARY 1998

99.9% by weight, relative to the solids content thereof, of an aqueous dispersion of acrylic polymer latex, and 0.1 to 4% by weight, also relative to the solids content thereof, of an aqueous emulsion of an aro- matic epoxy resin, which comprises a non- ionic surface-active agent, said aqueous dispersion further comprising 1 to 25% by weight, relative to the weight of the dry epoxy resin, of a reactive diluent.

Coil Coating Composition U.S. Patent 5,635,555. June 3, 1997 P. Vranken and/~ Pigeolet, assignors to Fina Research S.A., Seneffe, Belgium

A primer coating composition having excellent cut-side corrosion resistance es- sentially consisting of a binder system con- sisting essentially of a linear polyester res- in; a cross linking agent selected from the group consisting of block polyisocyantes, melamine, and urea-formaldehyde adducts, and a suitable cross linking catalyst; at least one anticorrosive chromate pigment, the amount of pigment being at least 50% of all pigments in the composition, and the pig- ment volume concentration being 90 to 99% of the critical pigment volume con- centration; and at least one solvent.

M u l t i c o a t C o a t i n g U.S. Patent 5,635,564. June 3, 1997 S. Wieditz et al., assignors to BASF Lacke Farben AG, Muenster-Hiltrup, Germany

A process for the preparation of a mul- ticoat protective and/or decorative coating on a substrate surface comprising applying a pigmented aqueous coating composition, which comprises a water-thinnable emul- sion polymer, as basecoat composition; ap- plying a suitable clear topcoat composition to the basecoat obtained in this manner; and baking the basecoat and the topcoat together.

Topcoating Composition U.S. Patent 5,635,572. June 3 1997 K. Ohnishi et al., assignors to Kansai Paint Co. Ltd., AmagashL Japan

A topcoating composition prepared by mixing a condensate of an organosilicate.

Primer Composition U.S. Patent 5,635,578. June 3, 1997 M. Arai et aL, assignors to Shin.Etsu Chemical Co. Ltd., Tokyo

A primer composition consisting essen- tially of an organosilicon compound having

a fluorine containing organic group and having a hydrogen silyl group at both of the terminals of the molecule and a platinum group metal catalyst.

Electrostatic Spray Device U.S. Patent 5,636,796. June 10, 1997 K. Buschor, assignor to Gema Volstatic AG, St. Gallen, Switzerland

An electrostatic spray device for coating an article comprising a machine arm hav- ing a first hollow interior space defined therein, and being movable with respect to an article to be coated; a carrier releasably mounted upon the machine arm, and hav- ing a second hollow interior space defined therein; a plurality of gun barrels, releas- ably mounted upon the said carrier, wherein each gun barrel has a third hollow interior space respectively defined therein, and forming with the carrier a respective plurality of spray guns; a plurality of elec- trodes respectively disposed within the plu- rality of gun barrels; a plurality of coating material supply lines for respectively sup- plying coating material to each one of the plurality of gun barrels; a plurality of corn-

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