Method of preparing polymer surfaces for subsequent plating ther

Details Method of preparing polymer surfaces for subsequent plating ther Method of preparing polymer surfaces for subsequent plating ther

1991-08-12

1993-01-19

Lusignan, Michael

Stock material or miscellaneous articles

Composite

Of polycarbonate

156635, 156651, 156668, 205167, 427307, 428458, 428460, 428462, B32B 2736

Patent

active

051806398

ABSTRACT:
Method of modifying an aromatic polymer surface to improve adhesion of a metal layer thereon and to the articles produced therefrom. The surface of the aromatic polymer such as polycarbonate, is nitrated by a contact with a nitrating solution such as a mixture of nitric and sulfuric acid and then hydroxylated by a contact with a hydroxylating solution such as ammonium hydroxide. The hydroxlyated surface is thus chemically modified to become hydrophilic. The chemically modified surface is electrolessly plated with a primary metal layer. A secondary metal layer is then electrolessly or electrolytically applied on top of the primary metal layer until a metal layer of a desired thickness is attained.
The present invention further discloses articles such as an EMI shielded enclosure or a printed circuit board having metal layers as an EMI shield or a conductive metal trace pattern respectively.

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patent: 4775557 (1988-10-01), Bastenbeck et al.
patent: 4941940 (1990-07-01), Patel et al.
patent: 4959121 (1990-09-01), Dumas et al.
Crivello, J., Nitrations and Oxidations with Inorganic Nitrate Salts in Trifluoroacetic Anhydride 1981, pp. 3056-3060, J. Org. Chem., 46.
Rantell, A., The Influence of Surface Chemistry on the Adhesion of Copper Deposited on Plastic Substrates, 1969, pp. 197-202, Transactions of the Instituter of Metal Finishing, vol. 47.

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