Patent US4237190A successfully refreshed from Google Patents.
US4237190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propylene/polystyrene composition and substrates coated with such compositions
Assignee: Rexam Beverage Can Co
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Filing: 1979-06-22
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Granted: 1980-12-02
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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
2026-10-30 22:27
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/10; B05; B05D; B05D1/00; B05D1/26; B05D1/265; B32B27/18; B32B27/20; B32B27/30; B32B27/302; B32B27/32; B32B37/00; B32B37/14; B32B37/15; B32B37/153; C; C09; C09D; C09D123/00; C09D123/02; C09D123/10; C09D123/12; D; D21; D21H; D21H19/00; D21H19/36; D21H19/44; D21H19/56; D21H19/58; B32B2270/00; B32B2323/00; B32B2323/10; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1303; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31902
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
117 words
A substrate coated with a film of an extruded coating composition comprising a polymer 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 , said coated substrate being obtained by extruding said polymer blend at a melt temperature of about 475° F. to about 575° F. onto said substrate and contacting said coated substrate with a chill roll maintained at a temperature of about 120° F. to 200° F. to effect adhesion and solidification of said extrudate on said substrate.
Claim 2
Dependent Claim
117 words
A substrate coated with a film of an extruded coating composition comprising a polymer 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 , said coated substrate being obtained by extruding said polymer blend at a melt temperature of about 475° F. to about 575° F. onto said substrate and contacting said coated substrate with a chill roll maintained at a temperature of about 120° F. to 200° F. to effect adhesion and solidification of said extrudate on said substrate.
Claim 3
Dependent Claim
16 words
A coated substrate as defined in claim 1 in which said polymer blend comprises a pigment.
Claim 4
Dependent Claim
14 words
A coated substrate as defined in claim 1 in which the substrate is paperboard.
Claim 5
Dependent Claim
40 words
A coated paperboard substrate as defined in claim 3 in which said polymer blend comprises from about 50% to 70% by weight polypropylene, from about 10% to 30% by weight polystyrene and up to about 10% of an inorganic pigment.
Claim 6
Dependent Claim
19 words
A coated paperboard substrate as defined in claim 4 in which said pigment is titanium dioxide or carbon black.
Claim 7
Dependent Claim
49 words
A coated paperboard substrate as defined in claim 3 in which said polymer blend comprises from about 50% to 70% by weight of 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 8
Dependent Claim
25 words
A coated paperboard substrate as defined in claim 3 in which said coating thickness is within the range of about 0.3 to about 1.0 mil.
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) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |