Patent US3666005A successfully refreshed from Google Patents.
Patent US3887640A successfully refreshed from Google Patents.
US3887640A
Expired / Lapsed
US
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Extrusion coating composition containing ethylenepropylene block copolymer and polyethylene having a MIR of at least 50
Assignee: Eastman Kodak Co
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Filing: 1972-08-15
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Granted: 1975-06-03
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Expires: 1992-08-15
Abstract
Abstract Extrusion coating compositions providing coatings having an improved balance of properties including heat resistance, greaseproofness, hardness, scuff resistance, good impact strength, pinhole resistance, and improved heat sealing characteristics are disclosed. These coatings contain propylene containing crystalline block copolymer and polyethylene having a MIR greater than 50.
Inventors
- 👤 Juan C Diaz
- 👤 Ray Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:09
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/10; D21H19/14; D21H19/20; D21H19/22; C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/10; C08L53/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
94 words
AN EXTRUSION COATING COMPOSITION CAPABLE OF PROVIDING EXTRUSION COATINGS OF LESS THAN 0.6 MIL THICKNESS CHARACTERIZED BY GOOD HARDNESS, SCUFF RESISTANCE, IMPACT STRENGTH, PINHOLE RESISTANCE AND HEAT SEALING PROPERTIES CONSISTING OF A POLYMER BLEND CONSISTING ESSENTIALLY OF 40 TO 99 PERCENT, BY WEIGHT OF AN ETHYLENE/PROPYLENE BLOCK POLYMER CONTAINING AT LEAST 80 WEIGHT PERCENT POLYMERIZED PROPYLENE HAVINF A FLOW RATE OF ABOUT 15 DG/MNUTE TO 100 DG/MINUTE AS DETERMINED BY ASTM D-1238-62T AND 1 TO 60 PERCENT, BY WEIGHT, OF POLYETHYLENE HAVING A MIR OF AT LEAST 50 AND A DENSITY GREATER THAN 0.912.
Claim 2
Dependent Claim
94 words
AN EXTRUSION COATING COMPOSITION CAPABLE OF PROVIDING EXTRUSION COATINGS OF LESS THAN 0.6 MIL THICKNESS CHARACTERIZED BY GOOD HARDNESS, SCUFF RESISTANCE, IMPACT STRENGTH, PINHOLE RESISTANCE AND HEAT SEALING PROPERTIES CONSISTING OF A POLYMER BLEND CONSISTING ESSENTIALLY OF 40 TO 99 PERCENT, BY WEIGHT OF AN ETHYLENE/PROPYLENE BLOCK POLYMER CONTAINING AT LEAST 80 WEIGHT PERCENT POLYMERIZED PROPYLENE HAVINF A FLOW RATE OF ABOUT 15 DG/MNUTE TO 100 DG/MINUTE AS DETERMINED BY ASTM D-1238-62T AND 1 TO 60 PERCENT, BY WEIGHT, OF POLYETHYLENE HAVING A MIR OF AT LEAST 50 AND A DENSITY GREATER THAN 0.912.
Claim 3
Dependent Claim
94 words
An extrusion coating composition capable of providing extrusion coatings of less than 0.6 mil thickness characterized by good hardness, scuff resistance, impact strength, pinhole resistance and heat sealing properties consisting of a polymer blend consisting essentially of 40 to 99 percent, by weight, of an ethylene/propylene block copolymer containing at least 80 weight percent polymerized propylene having a flow rate of about 15 dg/minute to 100 dg/minute as determined by ASTM D-1238-62T and 1 to 60 percent, by weight, of polyethylene having a MIR of at least 50 and a density greater than 0.912.
Claim 4
Dependent Claim
94 words
An extrusion coating composition capable of providing extrusion coatings of less than 0.6 mil thickness characterized by good hardness, scuff resistance, impact strength, pinhole resistance and heat sealing properties consisting of a polymer blend consisting essentially of 40 to 99 percent, by weight, of an ethylene/propylene block copolymer containing at least 80 weight percent polymerized propylene having a flow rate of about 15 dg/minute to 100 dg/minute as determined by ASTM D-1238-62T and 1 to 60 percent, by weight, of polyethylene having a MIR of at least 50 and a density greater than 0.912.
Claim 5
Dependent Claim
24 words
An extrusion coating composition according to claim 1 wherein said ethylene/propylene block copolymer has a flow rate of about 20 dg/minute to 100 dg/minute.
Claim 6
Dependent Claim
24 words
An extrusion coating composition according to claim 2 wherein said ethylene/propylene block copolymer has a flow rate of about 25 dg/minute to 100 dg/minute.
Claim 7
Dependent Claim
67 words
An extrusion coating composition according to claim 1 consisting of a polymer blend consisting essentially of 75 to 97.5 percent, by weight, of an ethylene/propylene block copolymer containing at least 80 percent polymerized propylene having a flow rate of about 15 dg/minute to 100 dg/minute and 2.5 to 25 percent, by weight, of polyethylene having a MIR of at Least 50 and a density greater than 0.912.
Claim 8
Dependent Claim
24 words
An extrusion coating composition according to claim 4 wherein said ethylene/propylene block copolymer has a flow rate of about 20 dg/minute to 100 dg/minute.
Claim 9
Dependent Claim
24 words
An extrusion coating composition according to claim 5 wherein said ethylene/propylene block copolymer has a flow rate of about 25 dg/minute to 100 dg/minute.
Claim 10
Dependent Claim
65 words
An extrusion coating composition according to claim 2 consisting of a polymer blend consisting essentially of about 90 percent, by weight, of an ethylene/propylene block copolymer containing at least 80 percent polymerized propylene having a flow rate of about 15 dg/minute to 100 dg/minute and about 10 percent, by weight, of polyethylene having a MIR of at least 50 and a density greater than 0.912.
Claim 11
Dependent Claim
24 words
An extrusion coating composition according to claim 7 wherein said ethylene/propylene block copolymer has a flow rate of about 20 dg/minute to 100 dg/minute.
Claim 12
Dependent Claim
24 words
An extrusion coating composition according to claim 8 wherein said ethylene/propylene block copolymer has a flow rate of about 25 dg/minute to 100 dg/minute.
References Cited (Backward Citations)
US3328486A
Cited
US3358053A
Cited
US3487128A
Cited
US3517086A
Cited
US3529037A
Cited
US3700753A
Cited
US3647922A
Cited
US3660530A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |