Method for treating polyetherimide substrates and articles obtained therefrom
First Claim
1. A method for modifying the surface of a polyethermide substrate to improve its adhesion characteristics for electrolessly deposited metal without the use of an adhesion promoter which consists essentially of(A) treating the polyetherimide surface with a degreasing agent,(B) modifying the degreased polyetherimide surface with concentrated sulfuric acid.(C) treating the modified polyetherimide surface with an aqueous base to provide a pH of 14 or above,(D) oxidizing the resulting polyetherimide surface of (C) with alkali metal permanganate resulting in the production of a manganese oxide residue, and(E) effecting the removal of the manganese oxide residue from the polyetherimide surface by treating the polyetherimide surface with a reducing agent.
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Abstract
The method is provided for treating the surface of a polyetherimide substrate to improve its adhesion characteristics for electrolessly deposited metal, such as copper. There is employed a series of surface treatments including the initial immersion of the polyetherimide substrate in sulfuric acid, contact with aqueous base, such as potassium hydroxide, followed by oxidation with an alkali metal permanganate such as potassium permanganate, and surface treatment with a reducing agent, such as a hydroxylamine salt. Polyetherimide metal composites are also provided.
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Citations
11 Claims
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1. A method for modifying the surface of a polyethermide substrate to improve its adhesion characteristics for electrolessly deposited metal without the use of an adhesion promoter which consists essentially of
(A) treating the polyetherimide surface with a degreasing agent, (B) modifying the degreased polyetherimide surface with concentrated sulfuric acid. (C) treating the modified polyetherimide surface with an aqueous base to provide a pH of 14 or above, (D) oxidizing the resulting polyetherimide surface of (C) with alkali metal permanganate resulting in the production of a manganese oxide residue, and (E) effecting the removal of the manganese oxide residue from the polyetherimide surface by treating the polyetherimide surface with a reducing agent.
Specification