Aluminum Company of America

Alcoa Inc.

Gary A Nitowski

Larry F Wieserman

Karl Wefers

Joseph D Guthrie

Jean Ann Skiles

Daniel L Serafin

Robert E Bombalski

David S Bennett

Sallie L Blake

Clinton Zediak

Edward S Martin

James M Marinelli

Sherri F McCleary

John T Siemon

Joseph P Harenski

John V Costrini

Daniel C Johnson

A printing plate for computer-to plate lithography having a laser-ablatable member supported by a substrate. At least one portion of the laser-ablatable member is formed form an acrylic polymer containing laser-sensitive particles. The laser-sensitive particles absorb imaging radiation and cause the portion of the laser-ablatable member containing the laser sensitive particles and any overlying layers to be ablated.

Printing Plate

Printing plate

Adhesive bonding process for aluminum alloy bodies including hypophosphorous acid anodizing

An aluminum alloy sheet, plate, casting or extrusion having a surface layer containing magnesium oxide and aluminum oxide is cleaned with an acidic solution. The cleaned component has an aluminum oxide layer that is pretreated with a phosphorus-containing organic acid to form a functionalized layer. A layer of polymeric adhesive is applied to the functionalized layer, and the adhesive layer is joined to a metal support structure to form a vehicle assembly.

Acid pretreatment for adhesive bonding of vehicle assemblies

Aluminum alloy sheet is provided with a primer layer comprising a reaction product of aluminum oxide or hydroxide and a vinylphosphonic acid-acrylic acid copolymer, coated with a polymer coating composition containing polyvinyl chloride or an epoxy. The polymer coated aluminum alloy sheet is shaped into container bodies for food containers or container end panels for aluminum food and beverage containers.

Copolymer primer for aluminum alloy food and beverage containers

Aluminum alloy sheet coated with an organophosphonic or organophosphinic acid is joined to an adjacent metal member by means of a polymeric adhesive, preferably an epoxy adhesive. The coated sheet may be worked into a desired configuration after coating. Assemblies made in accordance with the invention are useful as vehicle parts, including automotive body parts.

Coating aluminum alloy sheet to promote adhesive bonding for vehicle

A laminate suitable for vehicular applications includes at least two sheets of aluminum alloy and an adhesive layer between the sheets bonding them together. An oxide layer on surfaces of the sheets is treated with a phosphorous acid electrolyte, so that a coordination number of four predominates for the aluminum-oxygen-phosphorous bond. Equivalent bonding strengths in the laminates are obtained in substantially less time with phosphorous acid treatment compared with phosphoric acid treatment.

Adhesively bonded aluminum

A twice-anodized aluminum substrate is anodized sequentially in first and second aqueous electrolytes. In the first, the substrate is conventionally anodized to produce (i) a porous anodic oxide layer having open pores and a passivation layer thereunder. The substrate, now singly-coated, is then anodized in the second electrolyte of an aqueous solution of an organophosphorus compound which generates a residue which is chemisorbed and covalently bonded to the substrate to form (ii) a monomolecular essentially continuous monolayer on the outer surface of (i), and at the same time, the second anodizing step produces (iii) a barrier layer of non-porous aluminum oxide under (i). The thickness of this barrier layer can be increased as a function of the voltage used while maintaining the thickness of (i) substantially constant, and (ii) protects (i) from dissolution. Depending upon the choice of the organophosphorus compound, a hydrophobic, or chemically resistant surface may be produced; or, a surface which provides a leaving group to be reacted with an appropriate organic coating to be applied after the triplex layer is formed.

Twice-anodized aluminum article having an organo-phosphorus monolayer

Disclosed is a food or beverage container or container panel comprised of an aluminum alloy body having an integral bottom and wall. An intermediate layer comprised of an aluminum oxide or aluminum hydroxide layer is bonded to the aluminum alloy body and a functionalized layer of an organo phosphonate, organo phosphinate or phosphate ester is bonded to the oxide or hydroxide layer. A polymer layer is bonded to the functionalized layer. The functionalized layer is comprised of the reaction product of phosphonic or phosphinic acid and/or phosphonic acid ester, for example.

Food or beverage container or container panel

Disclosed is a method of producing a functionalized layer and an aluminum hydroxide layer on an aluminum substrate, the aluminum hydroxide layer located between the substrate and the functionalized layer. The method comprises the steps of subjecting an aluminum substrate to a hydrothermal treatment in an aqueous solution having a pH in the range of 2 to 14 to form a layer of aluminum hydroxide on said substrate and thereafter treating said aluminum substrate with a phosphorus-containing acid selected from phosphinic and phosphonic acid to form a functionalized layer on said aluminum hydroxide layer, the functionalized layer comprised of the reaction product of said acid and the layer of aluminum hydroxide.

Phosphonic/phosphinic acid bonded to aluminum hydroxide layer

Disclosed is a process for anodically oxidizing aluminum alloy surfaces as a pretreatment for structural adhesive bonds or laminates. The process is comprised of anodically oxidizing aluminum and its alloys in phosphorous acid containing electrolyte to form a porous film comprised of Al, O and P. This film provides a very effective substrate for adhesively bonding aluminum articles and laminates.

Process for making an adhesively bonded aluminum article

A process is disclosed for treating the surface of a valve metal such as aluminum to form a two layer protective coating thereon using an anodizing bath consisting essentially of an aqueous solution having a concentration ranging from about 0.001 molar to a saturated solution of a monomeric phosphorus- containing compound selected from the class consisting of a 1-30 carbon water soluble phosphonic acid, a 1-30 carbon water soluble phosphinic acid, and mixtures thereof. The valve metal surface is anodized in the anodizing bath while maintaining a voltage selected from a range of from about 1 to about 400 volts until the current density falls to a level indicative of the fact that a nonporous valve oxide layer has been formed on the valve metal surface and a reaction product from the monomeric phosphonic/phosphinic acid compound is chemically bonded to the oxide layer.

Anodic phosphonic/phosphinic acid duplex coating on valve metal surface

Method of making a food or beverage container

A process is disclosed for treating the surface of a valve metal such as aluminum to form a two layer protective coating thereon using an anodizing bath consisting essentially of an aqueous solution having a concentration ranging from about 0.001 molar to a saturated solution of a phosphorus-containing compound selected from the class consisting of a phosphorus acid ester and salts thereof. A non-porous barrier valve metal oxide layer is formed on a surface of the valve metal, and a functionalized layer comprised of a phosphate ester is formed on the oxide layer. The functionalized layer protects the oxide layer against chemical attack by the electrolyte during anodizing

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Natrona, PA, United States of America

Gary A Nitowski