carbonate groups, wherein the la- tent primary amine functionality is obtained by reacting a cyclic anhydride and a amine compound comprising two primary amine groups and one secondary amine

group.

PROCESS FOR IMPROVING PAINT ADHESION

U.S. Patent 5,961,809. Oct. 5,1999 W.A. Roland and A. Nowak, assignors to Henkel, Duesseldorf; Germany

A process for improving the adhe- sion of subsequently applied paint to an anodized metal surface after thin-layer anodization comprising contacting with an aqueous solu- tion of 200 to 2,000 ppm of a ho- mopolymer ro copolymer of at least one of acrylic acid,

methacrylic acid, esters of acrylic acid, and esters of methacrylic acid and 5 to 50 ppm of hydroflu- oric acid, anions thereof, or both hydrofluoric acid and anions thereof; or contacting with 200 to 3,000 ppm in total of at least one of unneutralized hexafluoroti- tanic acid and hexafluorozirconic acid; and ammonium salts of at least one of hexafluorotitanic acid and hexafluorozirconic acid.

PAINT MASK

U.S. Patent 5,962,072. Oct. 5, 1999 A.J. Yerman, Toms River, NJ

A paint mask for protecting an area from paint, which is being applied to an adjacent or nearby area, comprising a suction cup

formed of an elastic, substantially gas-impermeable material, the suction cup having a concave in- ner surface.

METHOD FOR ELECTROPLATING POLVPHTHALAMlDE AKTICLES

U.S. Patent 5,962,073. Oct. 5, 1999 R.J. Timmer, assignor to Lacks Industries Inc., Grand Rapids, Mich.

A process for metal plating an ar- ticle of an elastomeric material dispersed in a polyphthalamide comprising etching with a solu- tion of trivalent chromium ions, hexavalent chromium ions, and sulfuric acid, said trivalent chro- mium ions being present in an amount of 6.5 to 7.5 oz/gal at 140 to 165°F; rinsing at a temperature below 100°F; neutralizing to re-

ATURES: c output less than 1 %

residual AC ripple urrent limiter : once

set will not rise even temperature of bath rose. '. :"

A Rust proof shell made ""' from Acrylic plastic.

A Individual voltage/ ampere adjust; 0.1 unit.

A DUO Input : 120/ 240 vAC A Table space miser :

RD645 - 8" x 10" RD660 - 16" x 9"

5a

. Selectable constant voltage and constant current mode.

l Independent calibration of

current and voltage mode.

. DC output less than 1% residue AC ripple.

-- Rosedale New York 718-481-8711 Fax 718-481-9859

Circle 048 on reader information card

The Electrodeposition of Tin and Its Alloys

by M. Jordan 409 pages $130.00

This is the definitive book on every conceiv- able aspect of the electrodeposition (and elec- troless deposition) of tin and its alloys. All bath types are discussed in detail. Analysis of baths and testing of deposits using both sim- ple methods and more advanced instrumental techniques are covered. National, internation- al, military, and other standards and specifica- tions are also included.

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110 Metal Finishing