US4851081A
Expired / Lapsed
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Process for preparing conductive plastic articles
Assignee: Hoechst Celanese Chemical Co
•
Filing: 1988-06-30
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Granted: 1989-07-25
•
Expires: 2008-06-30
Abstract
Abstract Conductive plastic articles are prepared by forming plastic pellets, etching the pellets in an etching bath, treating the pellets with a palladium-tin catalyst solution and an acidic accelerator, coating the pellets with metal, and heating the coated pellets.
Inventors
- 👤 Alex Forschirm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:54
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/06; H01B1/20; H01B1/22; C; C08; C08J; C08J3/00; C08J3/20; C08J3/22; C08J3/226; C23; C23C; C23C18/00; C23C18/16; C23C18/1601; C23C18/1633; C23C18/1635; C23C18/1689; C23C18/1692; C23C18/18; C23C18/20; C23C18/2006; C23C18/2046; C23C18/2073; C23C18/208; C23C18/28; C23C18/285; C23C18/30; B; B65; B65G; B65G2207/00; B65G2207/10
Claims Analysis
Total Claims: 50
Claim 1
Independent Claim
42 words
A process for preparing a conductive plastic article which comprises the steps of: (1) preparing plastic pellets; (2) etching the pellets in an etching bath; (3) coating the pellets with metal; (4) heating the coated plastic pellets to form a conductive article.
Claim 2
Dependent Claim
42 words
A process for preparing a conductive plastic article which comprises the steps of: (1) preparing plastic pellets; (2) etching the pellets in an etching bath; (3) coating the pellets with metal; (4) heating the coated plastic pellets to form a conductive article.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the plastic is a platable grade thermoplastic engineering resin.
Claim 4
Dependent Claim
10 words
The process of claim 1 wherein the plastic is polyacetal.
Claim 5
Dependent Claim
51 words
The process of claim 3 wherein the etching bath is comprised of about 15 to about 50 percent by volume sulfuric acid, about 5 to about 20 percent by volume concentrated hydrochloric acid and about 30 to about 80 percent by volume water based upon the total volume of the bath.
Claim 6
Dependent Claim
41 words
The process of claim 3 wherein the etching bath is comprised of about 35 percent by volume sulfuric acid, 15 percent by volume concentrated hydrochloric acid, and about 50 percent by volume water, based upon the total volume of the bath.
Claim 7
Dependent Claim
29 words
The process of claim 1 wherein the pellets are kept in the etching bath for a period of time in the range of about 5 to about 30 minutes.
Claim 8
Dependent Claim
15 words
The process of claim 6 wherein the time is about 15 to about 20 minutes.
Claim 9
Dependent Claim
23 words
The process of claim 1 wherein the temperature of the bath is in the range of about 60° F. to about 90° F.
Claim 10
Dependent Claim
23 words
The process of claim 8 wherein the temperature of the bath is in the range of about 70° F. to about 80° F.
Claim 11
Dependent Claim
34 words
The process of claim 3 wherein the pellets contain about 1/2 to about 10 percent by weight calcium carbonate based upon the total weight of the polyacetal resin and calcium carbonate in the pellets.
Claim 12
Dependent Claim
34 words
The process of claim 10 wherein the pellets contain about 1 to about 5 percent by weight calcium carbonate based upon the total weight of the polyacetal resin and calcium carbonate in the pellets.
Claim 13
Dependent Claim
63 words
The process of claim 1 wherein after being etched and before being coated the pellets are treated with a palladium-tin catalyst solution by immersing the pellets in a solution containing about 1.2 to about 2.5 grams of palladium chloride, about 80 to about 150 grams of stannous chloride and about 280 to about 360 milliliters of concentrated hydrochloric acid per liter of solvent.
Claim 14
Dependent Claim
44 words
The process of claim 12 wherein the palladium-tin catalyst solution contains about 1.5 to about 2.0 grams of palladium chloride, about 90 to about 110 grams of stannous chloride and about 280 to about 300 milliliters of concentrated hydrochloric acid per liter of solvent.
Claim 15
Dependent Claim
10 words
The process of claim 12 wherein the solvent is water.
Claim 16
Dependent Claim
10 words
The process of claim 13 wherein the solvent is water.
Claim 17
Dependent Claim
28 words
The process of claim 12 wherein the pellets are immersed in the solution for a period of time in the range of about 1 to about 5 minutes.
Claim 18
Dependent Claim
19 words
The process of claim 16 wherein the time is in the range of about 2 to about 3 minutes.
Claim 19
Dependent Claim
22 words
The process of claim 12 wherein the pellets are treated with an acidic accelerator prior to being coated with a metal coating.
Claim 20
Dependent Claim
12 words
The process of claim 18 wherein the acidic accelerator is hydrochloric acid.
Claim 21
Dependent Claim
11 words
The process of claim 1 wherein the pellets are electrolessly coated.
Claim 22
Dependent Claim
15 words
The process of claim 1 wherein the pellets are coated with silver, nickel, or copper.
Claim 23
Dependent Claim
18 words
The process of claim 20 wherein the pellets are coated by immersing them in an electroless nickel-phosphorous bath.
Claim 24
Dependent Claim
18 words
The process of claim 20 wherein the pellets are coated by immersing them in an electroless copper bath.
Claim 25
Dependent Claim
32 words
The process of claim 1 wherein the coated pellets are comprised of about 10 to about 50 percent by weight metal based upon the total weight of the plastic pellets and metal.
Claim 26
Dependent Claim
33 words
The process of claim 1 wherein the metal coated pellets are comprised of about 15 to about 25 percent by weight metal based upon the total weight of the plastic pellets and metal.
Claim 27
Dependent Claim
29 words
The process of claim 1 wherein the conductive article contains about 1/2 to about 40 percent by weight metal based upon the total weight of the metal containing article.
Claim 28
Dependent Claim
101 words
A process for preparing a conductive polyacetal article which comprises the steps of: (1) preparing polyacetal pellets; (2) etching the pellets in an etching bath comprised of about 15 to about 50 percent by volume sulfuric acid, about 5 to about 20 percent by volume concentrated hydrochloric acid, and about 30 to about 80 percent by volume water based upon the total volume of the bath; (3) treating the pellets with a palladium-tin catalyst solution; (4) treating the pellets with an acidic accelerator; (5) coating the pellets with metal; and (6) heating the coated pellets to form a conductive polyacetal article.
Claim 29
Dependent Claim
101 words
A process for preparing a conductive polyacetal article which comprises the steps of: (1) preparing polyacetal pellets; (2) etching the pellets in an etching bath comprised of about 15 to about 50 percent by volume sulfuric acid, about 5 to about 20 percent by volume concentrated hydrochloric acid, and about 30 to about 80 percent by volume water based upon the total volume of the bath; (3) treating the pellets with a palladium-tin catalyst solution; (4) treating the pellets with an acidic accelerator; (5) coating the pellets with metal; and (6) heating the coated pellets to form a conductive polyacetal article.
Claim 30
Dependent Claim
42 words
The process of claim 27 wherein the etching bath is comprised of about 35 percent by volume sulfuric acid, about 15 percent by volume concentrated hydrochloric acid, and about 50 percent by volume water based upon the total volume of the bath.
Claim 31
Dependent Claim
29 words
The process of claim 27 wherein the pellets are kept in the etching bath for a period of time in the range of about 5 to about 30 minutes.
Claim 32
Dependent Claim
15 words
The process of claim 29 wherein the time is about 15 to about 20 minutes.
Claim 33
Dependent Claim
22 words
The process of claim 27 wherein the temperature of the bath is the range of about 60° F. to about 90° F.
Claim 34
Dependent Claim
23 words
The process of claim 27 wherein the temperature of the bath is in the range of about 70° F. to about 80° F.
Claim 35
Dependent Claim
33 words
The process of claim 27 wherein the pellets contain about 1/2 to about 10 percent by weight calcium carbonate based upon the total weight of polyacetal resin and calcium carbonate in the pellets.
Claim 36
Dependent Claim
34 words
The process of claim 27 wherein the pellets contain about 1 to about 5 percent by weight calcium carbonate based upon the total weight of the polyacetal resin and calcium carbonate in the pellets.
Claim 37
Dependent Claim
56 words
The process of claim 27 wherein the pellets are treated with a palladium-tin catalyst solution by immersing the pellets in a solution containing about 1.2 to about 2.5 grams of palladium chloride, about 80 to about 150 grams of stannous chloride and about 280 to about 360 milliliters of concentrated hydrochloric acid per liter of solvent.
Claim 38
Dependent Claim
44 words
The process of claim 35 wherein the palladium-tin catalyst solution contains about 1.5 to about 2.0 grams of paladium chloride, about 90 to about 110 grams of stannous chloride and about 280 to about 300 milliliters of concentrated hydrochloric acid per liter of solvent.
Claim 39
Dependent Claim
10 words
The process of claim 35 wherein the solvent is water.
Claim 40
Dependent Claim
10 words
The process of claim 36 wherein the solvent is water.
Claim 41
Dependent Claim
28 words
The process of claim 35 wherein the pellets are immersed in the solution for a period of time in the range of about 1 to about 5 minutes.
Claim 42
Dependent Claim
19 words
The process of claim 35 wherein the time is in the range of about 2 to about 3 minutes.
Claim 43
Dependent Claim
12 words
The process of claim 27 wherein the acidic accelerator is hydrochloric acid.
Claim 44
Dependent Claim
15 words
The process of claim 27 wherein the pellets are coated with silver, nickel or copper.
Claim 45
Dependent Claim
11 words
The process of claim 27 wherein the pellets are electrolessly coated.
Claim 46
Dependent Claim
18 words
The process of claim 43 wherein the pellets are coated by immersing them in an electroless nickel-phosphorous bath.
Claim 47
Dependent Claim
18 words
The process of claim 43 wherein the pellets are coated by immersing them in an electroless copper bath.
Claim 48
Dependent Claim
31 words
The process of claim 27 wherein the pellets are comprised of about 10 to about 50 percent by weight metal based upon the total weight of the polyacetal pellets and metal.
Claim 49
Dependent Claim
31 words
The process of claim 27 wherein the pellets are comprised of about 15 to about 25 percent by weight metal based upon the total weight of the polyacetal pellets and metal.
Claim 50
Dependent Claim
28 words
The process of claim 27 wherein the conductive article contains about 1/2 to about 40 percent by weight metal based upon the total weight of the conductive article.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |