Patent US3947539A successfully refreshed from Google Patents.
US3947539A
Expired / Lapsed
US
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Method for cold forming plastic article
Assignee: Dow Chemical Co
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Filing: 1972-07-10
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Granted: 1976-03-30
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Expires: 1992-07-10
Abstract
Abstract Plastic substrate in the form of sheet, disk, or plate is advantageously converted to a shaped article by first surface sulfonating the plastic substrate and thereafter cold forming the plastic substrate to the desired shape. Surface sulfonation of the plastic substrate prior to cold forming eliminates the need for lubricating the plastic substrate or surfaces of the cold forming apparatus.
Inventors
- 👤 Eckel R. Lane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:04
CPC Classifications
B; B29; B29C; B29C59/00; B29C67/00; B29C67/0029; B29C51/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
79 words
In a process for cold forming a substrate of a sulfonateable polymer which can be cold formed wherein the substrate is positioned in a cold forming apparatus and formed into the desired shaped article at temperature below the heat-plastification point of the polymer; the improvement which comprises surface sulfonating the substrate of thermoplastic organic polymer to a degree sufficient to render the substrate surface water-wettable and subsequently cold forming the substrate to desired shape in the absence of lubricant.
Claim 2
Dependent Claim
79 words
In a process for cold forming a substrate of a sulfonateable polymer which can be cold formed wherein the substrate is positioned in a cold forming apparatus and formed into the desired shaped article at temperature below the heat-plastification point of the polymer; the improvement which comprises surface sulfonating the substrate of thermoplastic organic polymer to a degree sufficient to render the substrate surface water-wettable and subsequently cold forming the substrate to desired shape in the absence of lubricant.
Claim 3
Dependent Claim
11 words
The improvement of claim 1 wherein the polymer is predominantly hydrocarbon.
Claim 4
Dependent Claim
12 words
The improvement of claim 2 wherein the polymer is a styrene polymer.
Claim 5
Dependent Claim
12 words
The improvement of claim 1 wherein the surface sulfonated substrate is neutralized.
Claim 6
Dependent Claim
18 words
The improvement of claim 4 wherein neutralization is effected by contacting the surface sulfonated substrate with gaseous ammonia.
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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |