US4183845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melt extrudable polypropylene-polystyrene composition and method
Assignee: Rexam Beverage Can Co
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Filing: 1977-09-26
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Granted: 1980-01-15
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Expires: 1997-09-26
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 09:33
CPC Classifications
C; C09; C09D; C09D123/00; C09D123/02; C09D123/10; C09D123/12; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
83 words
A melt extrudable coating composition comprising a blend of polystyrene with a polypropylene compatible therewith and having a melt flow rate, as determined by ASTM-D1238-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, the polymers of the blend being suitable for extrusion coating at melt temperatures in the range of about 475° F. to about 575° F. without substantial degradation.
Claim 2
Dependent Claim
83 words
A melt extrudable coating composition comprising a blend of polystyrene with a polypropylene compatible therewith and having a melt flow rate, as determined by ASTM-D1238-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, the polymers of the blend being suitable for extrusion coating at melt temperatures in the range of about 475° F. to about 575° F. without substantial degradation.
Claim 3
Dependent Claim
22 words
A melt extrudable coating composition as described in claim 1 in which the polystyrene has a molecular weight at least about 200,000.
Claim 4
Dependent Claim
37 words
A melt extrudable coating composition as described in claim 1 in which the polypropylene has a molecular weight in the range of at least about 100,000 to about 150,000 and a melt flow rate of about 30.
Claim 5
Dependent Claim
17 words
A melt extrudable coating composition as described in claim 1 wherein said composition additionally comprises a pigment.
Claim 6
Dependent Claim
97 words
A melt extrudable composition comprising a blend of polystyrene with a polypropylene having a melt flow rate, as determined by ASTM-D1238-G, within the range of about 30 to about 40 grams per ten minutes, the polymers of the blend being suitable for extrusion coating at melt temperatures in the range of about 475° F. to about 575° without substantial degradation, said composition comprising from about 50 to 70% by weight of polypropylene, about 10 to 30% by weight of polystyrene, and about 5 to 30% by weight of a concentrate of a pigment in a polyethylene carrier.
Claim 7
Dependent Claim
97 words
A melt extrudable composition comprising a blend of polystyrene with a polypropylene having a melt flow rate, as determined by ASTM-D1238-G, within the range of about 30 to about 40 grams per ten minutes, the polymers of the blend being suitable for extrusion coating at melt temperatures in the range of about 475° F. to about 575° without substantial degradation, said composition comprising from about 50 to 70% by weight of polypropylene, about 10 to 30% by weight of polystyrene, and about 5 to 30% by weight of a concentrate of a pigment in a polyethylene carrier.
Claim 8
Dependent Claim
15 words
A melt extrudable coating as described in claim 5 wherein said pigment is titanium dioxide.
Claim 9
Dependent Claim
24 words
A melt extrudable coating composition as described in claim 1 wherein said composition includes an anti-oxidant added to the polystyrene to inhibit thermal degradation.
Claim 10
Dependent Claim
91 words
A melt extrudable coating composition suitable for extrusion coating at melt temperatures of about 475° F. to 525° F. without substantial degradation comprising a blend of from about 10 to 30% by weight of crystal polystyrene having a molecular weight of about 250,000 to 325,000, from about 50 to 70% by weight of a polypropylene having a melt flow rate, as determined by ASTM-D-1238-G, of about 30 grams per ten minutes and from about 5 to 30% by weight of a pigment concentrate comprising titanium dioxide dispersed in a polyethylene carrier.
Claim 11
Dependent Claim
91 words
A melt extrudable coating composition suitable for extrusion coating at melt temperatures of about 475° F. to 525° F. without substantial degradation comprising a blend of from about 10 to 30% by weight of crystal polystyrene having a molecular weight of about 250,000 to 325,000, from about 50 to 70% by weight of a polypropylene having a melt flow rate, as determined by ASTM-D-1238-G, of about 30 grams per ten minutes and from about 5 to 30% by weight of a pigment concentrate comprising titanium dioxide dispersed in a polyethylene carrier.
Claim 12
Dependent Claim
23 words
A melt extrudable coating composition as described in claim 1 wherein said composition comprises up to 10% by weight of an inorganic pigment.
Claim 13
Dependent Claim
19 words
A melt extrudable coating composition as described in claim 9 wherein said pigment is titanium dioxide or carbon black.
Claim 14
Dependent Claim
22 words
A melt extrudable coating composition according to claim 5, and characterized in that said polystyrene has a molecular weight greater than 200,000.
Claim 15
Dependent Claim
40 words
A melt extrudable coating composition according to claim 5, and characterized in that said polypropylene has a molecular weight in the range of about 100,000 to about 150,000 and a melt flow rate of about 30 grams per ten minutes.
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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) | 1983-01-14 | 1983-07-16 | 1984-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-14 | 1987-07-16 | 1988-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-14 | 1991-07-16 | 1992-01-15 | $7700.00 | Window Closed / Lapsed |