US3957940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wrinkle free extrusion coating of heat fusible foam sheet
Assignee: Standard Oil Co
•
Filing: 1974-05-31
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Granted: 1976-05-18
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Expires: 1994-05-31
Abstract
Abstract In a process for extrusion coating of both sides of a foamed polystyrene sheet with a rubber modified polystyrene the specific improvement of crushing the coated foam sheet such that it will rebound to only 30 to 70 percent of its original thickness results in a product of improved processing characteristics. This crushed sheet can be thermally formed into a wrinkle free china-like surface useful in making insulated dishes, trays, food containers and the like.
Inventors
- 👤 John C. Schubert
- 👤 Edward C. Le Duc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:00
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/20; B05; B05C; B05C9/00; B05C9/04; B05D; B05D1/00; B05D1/26; B05D1/265; B29C48/00; B05D2201/00; B05D2252/00; B05D2252/02; B05D2252/10; B29C48/03; B29C48/07; B29C48/08; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043; Y10T156/1044; Y10T156/1048; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24992
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
160 words
A process for coating two sides of a heat fusible foam sheet with a resinous polymeric material compatibly heat fusible with said heat fusible sheet comprising: (1) melting the resinous polymeric material; (2) extruding the resinous polymeric material through at least one flat film die sequentially onto the first and then the second side of the heat fusible foam sheet wherein the contacted heat fusible foam sheet and said resinous polymeric material are crushed simultaneously with the second side being coated such that it rebounds to only 40 to 60 percent of its original thickness whereby a coated sheet is produced which does not give rise to wrinkles, cracks, or other surface blemishes when said coated sheet is passed around rollers that give rise to a change in direction of travel of said coated sheet of more than 90° and the ratio of the arc diameter of said roll to thickness of said coated sheet is as low as 100.
Claim 2
Dependent Claim
160 words
A process for coating two sides of a heat fusible foam sheet with a resinous polymeric material compatibly heat fusible with said heat fusible sheet comprising: (1) melting the resinous polymeric material; (2) extruding the resinous polymeric material through at least one flat film die sequentially onto the first and then the second side of the heat fusible foam sheet wherein the contacted heat fusible foam sheet and said resinous polymeric material are crushed simultaneously with the second side being coated such that it rebounds to only 40 to 60 percent of its original thickness whereby a coated sheet is produced which does not give rise to wrinkles, cracks, or other surface blemishes when said coated sheet is passed around rollers that give rise to a change in direction of travel of said coated sheet of more than 90° and the ratio of the arc diameter of said roll to thickness of said coated sheet is as low as 100.
Claim 3
Dependent Claim
21 words
A process of claim 1 wherein the resinous polymeric material is acrylonitrile-butadiene-styrene, acrylonitrile-styrene, polyvinylchloride, polystyrene, styrene-maleic anhydride or rubber modified polystyrene.
Claim 4
Dependent Claim
17 words
A process of claim 1 wherein the heat fusible foam sheet is polystyrene, styrene copolymers or polyvinylchloride.
Claim 5
Dependent Claim
20 words
The process of claim 1 wherein the heat fusible foam sheet is polyethylene and the resinous polymeric material is polyethylene.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein the heat fusible foam sheet is polypropylene and the resinous polymeric material is polypropylene.
Claim 7
Dependent Claim
22 words
The process of claim 1 wherein the heat fusible foam sheet is polystyrene and the resinous polymeric material is rubber modified polystyrene.
Claim 8
Dependent Claim
18 words
The process of claim 6 wherein the coated foamed sheet is crushed by a pair of chill rollers.
Claim 9
Dependent Claim
33 words
The process of claim 6 wherein said crushed sheet is not damaged when subjected to a reverse wrap over a roll at a ratio of arc diameter to thickness as low as 100.
Claim 10
Dependent Claim
28 words
A process of claim 1 wherein said heat fusible foam sheet is a foamed polystyrene sheet coated on both sides with a film of rubber modified impact polystyrene.
Claim 11
Dependent Claim
128 words
A process for coating two sides of a heat fusible foam sheet with a resinous polymeric material compatibly heat fusible with said heat fusible sheet comprising the steps: (1) melting the resinous polymeric material; (2) extruding the resinous polymeric material through at least one flat film die sequentially onto the first then the second side of the heat fusible foam sheet; (3) crushing the coated foamed sheet simultaneously with said second side being such that it rebounds to only 40 to 60 percent of its original thickness; (4) continuously passing said crushed sheet over at least one roll with a reverse wrap at a ratio of arc diameter to thickness as low as 100; (5) recovering an undamaged crushed sheet capable of being thermoformed into a finished article.
Claim 12
Dependent Claim
128 words
A process for coating two sides of a heat fusible foam sheet with a resinous polymeric material compatibly heat fusible with said heat fusible sheet comprising the steps: (1) melting the resinous polymeric material; (2) extruding the resinous polymeric material through at least one flat film die sequentially onto the first then the second side of the heat fusible foam sheet; (3) crushing the coated foamed sheet simultaneously with said second side being such that it rebounds to only 40 to 60 percent of its original thickness; (4) continuously passing said crushed sheet over at least one roll with a reverse wrap at a ratio of arc diameter to thickness as low as 100; (5) recovering an undamaged crushed sheet capable of being thermoformed into a finished article.
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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) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |