US4131698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pretreatment of polyvinyl chloride plastics for electroless deposition
Assignee: RCA Corp
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Filing: 1977-12-16
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Granted: 1978-12-26
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Expires: 1997-12-16
Abstract
Abstract A process for pretreating polyvinyl chloride plastics to form adherent non-grainy conformal metal coatings by electroless deposition comprising immersing the polyvinyl chloride plastic in a solution comprising at least about 10 grams of alkali metal hydroxide dissolved in a solution consisting of about 5% to about 30% by volume of a water-soluble mono-, di-, or polyhydric alcohol and about 70% to about 95% by volume of water. The immersion time is variable from about 5 minutes in ultrasonically agitated, mildly heated solutions to about 6 to about 8 hours in non-agitated, unheated solutions. After pretreatment, the polyvinyl chloride plastic is treated by standard electroless plating procedures known in the art.
Inventors
- 👤 Cheryl A. Deckert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:09
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/22
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
74 words
A process for pretreating a polyvinyl chloride plastic prior to electroless metal deposition which comprises immersing the polyvinyl chloride plastic in a solution consisting of an alkali metal hydroxide in a concentration from about 10 grams to about 400 grams per liter of solution, wherein said solution comprises about 5% to about 30% by volume of a water soluble mono-, di-, or polyhydric alcohol and about 70% to about 95% by volume of water.
Claim 2
Dependent Claim
74 words
A process for pretreating a polyvinyl chloride plastic prior to electroless metal deposition which comprises immersing the polyvinyl chloride plastic in a solution consisting of an alkali metal hydroxide in a concentration from about 10 grams to about 400 grams per liter of solution, wherein said solution comprises about 5% to about 30% by volume of a water soluble mono-, di-, or polyhydric alcohol and about 70% to about 95% by volume of water.
Claim 3
Dependent Claim
25 words
The process according to claim 1 wherein said alkali metal hydroxide is selected from the group consisting of lithium hydroxide, sodium hydroxide, and potassium hydroxide.
Claim 4
Dependent Claim
30 words
The process according to claim 1 wherein said mono-, di-, or polyhydric alcohol is selected from the group consisting of methanol, ethanol, 1,4-butanediol isopropanol, ethylene glycol, propylene glycol, and glycerin.
Claim 5
Dependent Claim
13 words
The process according to claim 1 wherein the pretreatment solution is agitated ultrasonically.
Claim 6
Dependent Claim
22 words
The process according to claim 4 wherein said pretreatment solution is heated to a temperature of about 35 to about 40° C.
Claim 7
Dependent Claim
36 words
The process according to claim 5 wherein the solution comprises about 200 grams of KOH per liter of solution, wherein said solution comprises about 20% by volume of methanol and about 80% by volume of water.
Claim 8
Dependent Claim
70 words
A process for pretreating a polyvinyl chloride plastic prior to electroless metal deposition comprising immersing said plastic into a solution comprising about 10 to about 400 grams of potassium hydroxide per liter of solution, wherein said solution comprises about 10% to about 25% by volume of an alcohol selected from the group consisting of methanol, ethanol, or mixtures thereof, and from about 75% to about 90% by volume of water.
Claim 9
Dependent Claim
70 words
A process for pretreating a polyvinyl chloride plastic prior to electroless metal deposition comprising immersing said plastic into a solution comprising about 10 to about 400 grams of potassium hydroxide per liter of solution, wherein said solution comprises about 10% to about 25% by volume of an alcohol selected from the group consisting of methanol, ethanol, or mixtures thereof, and from about 75% to about 90% by volume of water.
Claim 10
Dependent Claim
22 words
The process according to claim 7 wherein from about 100 to about 400 grams of KOH per liter of solution are present.
Claim 11
Dependent Claim
105 words
In a process for the electroless deposition of metals on a polyvinyl chloride plastic comprising the steps of sequentially immersing the plastic in a catalyst solution, an acceleration solution and an electroless metal plating solution wherein the improvement comprises immersing said plastic in a solution consisting of about 10 to about 400 grams of an alkali metal hydroxide per liter of solution, wherein said solution comprises about 5% to about 30% by volume of a water soluble mono-, di-, or polyhydric alcohol, and about 70% to about 95% by volume of water, and rinsing said plastic in water prior to immersion in the catalyst solution.
Claim 12
Dependent Claim
105 words
In a process for the electroless deposition of metals on a polyvinyl chloride plastic comprising the steps of sequentially immersing the plastic in a catalyst solution, an acceleration solution and an electroless metal plating solution wherein the improvement comprises immersing said plastic in a solution consisting of about 10 to about 400 grams of an alkali metal hydroxide per liter of solution, wherein said solution comprises about 5% to about 30% by volume of a water soluble mono-, di-, or polyhydric alcohol, and about 70% to about 95% by volume of water, and rinsing said plastic in water prior to immersion in the catalyst solution.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |