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US4444836A Expired / Lapsed US ⏱️ 0.0 years remaining

Metal plated polyamide articles

Assignee: Honeywell International Inc
•
Filing: 1982-09-20
•
Granted: 1984-04-24
•
Expires: 2002-09-20
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Abstract

Abstract Disclosed is an improved process for preparing metal plated thermoplastic compositions by electroless metal deposition and subsequent electrolytic plating. This process comprises the sequence of etching a filled thermoplastic resin substrate with dilute acid solution, treating with a sensitizer such as a tin salt, activating with a noble metal salt solution, electroless metal deposition using an electroless copper or nickel plating solution, and electrolytic plating with a metal selected from the group consisting of copper, nickel, chromium, or combinations thereof. The improvement is in the use of a wollastonite filler having an average particle size of less than about 3.5 microns, wherein 95 numerical percent of the particles are smaller than 10 microns in the longest dimension. The resulting electroplated articles exhibit a mirror-like finish and a peel strength of at least about 3 lbs./in. Also disclosed is a nylon-6 plating composition useful in the process containing the above-described wollastonite filler and an organosilane coupling agent.

Inventors

  • 👤 Ghazi M. A. Khattab

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 23:53
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/28; C23C18/30; C23C18/2006; C23C18/2046; C23C18/2073; C23C18/2086; C23C18/285; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; H05K1/0353; H05K1/0373; H05K3/00; H05K3/10; H05K3/18; H05K3/181; H05K3/38; H05K3/381; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/258; Y10T428/259; Y10T428/31504; Y10T428/31678; Y10T428/31681

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 91 words
An article of manufacture comprising: a substrate having a surface, the substrate comprising a polyamide resin and about 5 to 60 weight percent, of a wollastonite filler, based on the total weight of the resin and filler, the wollastonite filler component which will not degrate thermal plastic resin and which is susceptible to attack by dilute acid solutions, there being minute anchors at or near the surface of the substrate, the anchors being 1-30 microns deep; and a continuous layer of electrolessly platable metal adjacent to the surface of the substrate.
Claim 2
Dependent Claim 91 words
An article of manufacture comprising: a substrate having a surface, the substrate comprising a polyamide resin and about 5 to 60 weight percent, of a wollastonite filler, based on the total weight of the resin and filler, the wollastonite filler component which will not degrate thermal plastic resin and which is susceptible to attack by dilute acid solutions, there being minute anchors at or near the surface of the substrate, the anchors being 1-30 microns deep; and a continuous layer of electrolessly platable metal adjacent to the surface of the substrate.
Claim 3
Dependent Claim 19 words
The article as recited in claim 1 further comprising a layer of electro plateable metal adjacent electrolessly plateable layer.
Claim 4
Dependent Claim 17 words
The article as recited in claim 1 or 2 wherein the surface of the substrate is activated.
Claim 5
Dependent Claim 15 words
The article as recited in claim 1 wherein the minute anchors are 2-25 microns deep.
Claim 6
Dependent Claim 18 words
The article as recited in claims 1 or 2 wherein the filler is treated with a coupling agent.
Claim 7
Dependent Claim 35 words
The article as recited in claim 5 wherein the wollastonite has an average particle size below about 3.5 microns and 95 numerical percent of the particles are below about 10 microns and their longest dimension.
Claim 8
Dependent Claim 25 words
The article as recited in claims 1 or 2 wherein the electrolessly plateable metal is selected from the group consisting of copper; nickel; and cobalt.
Claim 9
Dependent Claim 27 words
The article as recited in claim 1 wherein the electro plateable metal is selected from the group consisting essentially of copper, nickel, chromium, and a combination thereof.
Claim 10
Dependent Claim 38 words
The article as recited in claim 1 wherein the layer of electro plateable metal has a mirror like finish and a peal strength of at least three pounds per linear inch up to 10 pounds per linear inch.
Claim 11
Dependent Claim 27 words
The article as recited in claim 9 wherein the peal strength is from about six pounds per linear inch up to about 10 pounds per linear inch.

References Cited (Backward Citations)

US3419517A Cited
US3466232A Cited
US3833534A Cited
US3868017A Cited
US3830777A Cited
US4160049A Cited
US4349421A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1987-04-24 1987-10-24 1988-04-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1991-04-24 1991-10-24 1992-04-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1995-04-24 1995-10-24 1996-04-24 $7700.00 Window Closed / Lapsed

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