US4239822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propylene/polystyrene composition and method for coating
Assignee: Rexam Beverage Can Co
•
Filing: 1979-06-22
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Granted: 1980-12-16
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Expires: 1999-06-22
Abstract
Abstract Melt extrudable polypropylene-polystyrene compositions are provided which are particularly suitable for use in extrusion coating. Substrates coated with such compositions as well as methods of producing such coated substrates are also provided.
Inventors
- 👤 Theodore L. McGee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:50
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/10; D21H19/14; D21H19/20; D21H19/22; B; B05; B05D; B05D1/00; B05D1/26; B05D1/265; B05D7/00; B05D7/02; C; C09; C09D; C09D123/00; C09D123/02; C09D123/10; C09D123/12; C09D125/00; C09D125/02; C09D125/04; C09D125/06; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
116 words
A process of coating a substrate with an extruded film of a polymer blend comprising: providing a blend of polystyrene and a polypropylene having a melt flow rate, as determined by ASTM-1238-G, within the range of about 30 to about 40 grams per ten minutes, the ratio of polypropylene to polystyrene in the blend being within the range of about 5:1 to 2:1; extruding said polymer blend without substantial degradation at a melt temperature of about 475° F. to about 575° F. to contact said substrate; passing said coated substrate to contact a chill roll maintained at a temperature of about 120°-200° F. to form an adhered layer of said extruded polymer blend on said substrate.
Claim 2
Dependent Claim
116 words
A process of coating a substrate with an extruded film of a polymer blend comprising: providing a blend of polystyrene and a polypropylene having a melt flow rate, as determined by ASTM-1238-G, within the range of about 30 to about 40 grams per ten minutes, the ratio of polypropylene to polystyrene in the blend being within the range of about 5:1 to 2:1; extruding said polymer blend without substantial degradation at a melt temperature of about 475° F. to about 575° F. to contact said substrate; passing said coated substrate to contact a chill roll maintained at a temperature of about 120°-200° F. to form an adhered layer of said extruded polymer blend on said substrate.
Claim 3
Dependent Claim
31 words
A process as claimed in claim 1 wherein said extrudate exits a 30 mil die and is drawn down to a thickness within the range of about 0.3 to 1 mil.
Claim 4
Dependent Claim
39 words
A process as claimed in claim 2 wherein said polymer blend comprises from about 50 to 70% by weight of polypropylene, from about 10 to 30% by weight of polystyrene and up to 10% by weight of a pigment.
Claim 5
Dependent Claim
45 words
A process as claimed in claim 2 wherein said polymer blend comprises from about 50% to 70% by weight polypropylene, from about 10 to 30% by weight polystyrene and from about 5 to 30% by weight of a concentrate of pigment in a polyethylene carrier.
Claim 6
Dependent Claim
10 words
The process of claim 1 wherein said substrate is paperboard.
References Cited (Backward Citations)
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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) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |