US4359553A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene extrusion coating compositions
Assignee: Eastman Chemical Co
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Filing: 1981-09-14
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Granted: 1982-11-16
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Expires: 2001-09-14
Abstract
Abstract This invention relates to novel low density polyethylene containing blends useful as extrusion coating compositions which provide coatings having good coatability and a broad heat seal range. These coated substrates then can be used in fabricating bags and other packaging applications. These coatings contain a blend of low density polyethylene and a degraded crystalline polypropylene or propylene containing copolymer.
Inventors
- 👤 Ray Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:43
CPC Classifications
C; C09; C09J; C09J123/00; C09J123/02; C09J123/04; C09J123/06; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/04
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
108 words
An extrusion coating composition having a melt index of 2 to 20 dg/min. at 190° C. which provides coatings on substrates having broad heat seal range comprising a blend of: (1) about 5 to 30 percent, by weight, of at least one degraded crystalline polypropylene or ethylene/propylene copolymer containing less than 5 weight percent ethylene, having a melt flow rate of 5 to 55 dg/min. at 230° C., and (2) about 95 to 70 percent, by weight, of at least one polyethylene having a density of 0.916 to 0.920, a melt index at 190° C. of 10 to 20, and a melt index recovery of greater than 50.
Claim 2
Dependent Claim
108 words
An extrusion coating composition having a melt index of 2 to 20 dg/min. at 190° C. which provides coatings on substrates having broad heat seal range comprising a blend of: (1) about 5 to 30 percent, by weight, of at least one degraded crystalline polypropylene or ethylene/propylene copolymer containing less than 5 weight percent ethylene, having a melt flow rate of 5 to 55 dg/min. at 230° C., and (2) about 95 to 70 percent, by weight, of at least one polyethylene having a density of 0.916 to 0.920, a melt index at 190° C. of 10 to 20, and a melt index recovery of greater than 50.
Claim 3
Dependent Claim
18 words
An extrusion coating composition according to claim 1 wherein said degraded crystalline propylene containing copolymer is crystalline polypropylene.
Claim 4
Dependent Claim
23 words
An extrusion coating composition according to claim 2 wherein said degraded crystalline polypropylene has a melt flow rate of 34 at 230° C.
Claim 5
Dependent Claim
34 words
An extrusion coating composition according to claim 2 wherein said low density polyethylene has a melt index of 13 dg/min. at 190° C., a density of 0.917 g/cc, and a 70 melt index recovery.
Claim 6
Dependent Claim
23 words
An extrusion coating composition according to claim 5 wherein said degraded ethylene/propylene copolymer has a melt flow rate of 30 at 230° C.
Claim 7
Dependent Claim
34 words
An extrusion coating composition according to claim 5 wherein said low density polyethylene has a melt index of 13 dg/min. at 190° C., a density of 0.917 g/cc, and a 70 melt index recovery.
Claim 8
Dependent Claim
121 words
An extrusion coating composition having a melt index of 2 to 20 dg/min. at 190° C. which provides coatings of less than 1 mil which have heat seal strengths of at least 10 pounds per linear inch comprising a blend of: (1) about 10 to 20 percent, by weight, of at least one degraded crystalline polypropylene or ethylene/propylene copolymer containing less than 5 weight percent ethylene, having a melt flow rate of 5 to 55 dg/min. at 230° C., and (2) about 90 to 80 percent, by weight, of at least one polyethylene having a density of about 0.916 to about 0.920, a melt index at 190° C. of 10 to 20, and a melt index recovery of greater than 50.
Claim 9
Dependent Claim
121 words
An extrusion coating composition having a melt index of 2 to 20 dg/min. at 190° C. which provides coatings of less than 1 mil which have heat seal strengths of at least 10 pounds per linear inch comprising a blend of: (1) about 10 to 20 percent, by weight, of at least one degraded crystalline polypropylene or ethylene/propylene copolymer containing less than 5 weight percent ethylene, having a melt flow rate of 5 to 55 dg/min. at 230° C., and (2) about 90 to 80 percent, by weight, of at least one polyethylene having a density of about 0.916 to about 0.920, a melt index at 190° C. of 10 to 20, and a melt index recovery of greater than 50.
Claim 10
Dependent Claim
18 words
An extrusion coating composition according to claim 7 wherein said degraded crystalline propylene containing copolymer is crystalline polypropylene.
Claim 11
Dependent Claim
23 words
An extrusion coating composition according to claim 8 wherein said degraded crystalline polypropylene has a melt flow rate of 34 at 230° C.
Claim 12
Dependent Claim
34 words
An extrusion coating composition according to claim 8 wherein said low density polyethylene has a melt index of 13 dg/min. at 190° C., a density of 0.917 g/cc, and a 70 melt index recovery.
Claim 13
Dependent Claim
24 words
An extrusion coating composition according to claim 5 wherein said degraded crystalline polypropylene copolymer has a melt flow rate of 30 at 230° C.
Claim 14
Dependent Claim
34 words
An extrusion coating composition according to claim 5 wherein said low density polyethylene has a melt index of 13 dg/min. at 190° C., a density of 0.917 g/cc, and a 70 melt index recovery.
Claim 15
Dependent Claim
106 words
An extrusion coating composition having a melt index of 12 dg/min. at 190° C. which provides coatings of less than 1 mil which have heat seal strengths of at least 10 pounds per linear inch comprising a blend of: (1) about 10 percent, by weight, of at least one degraded crystalline polypropylene or ethylene/propylene copolymer containing less than 5 weight percent ethylene, having a melt flow rate of 35 dg/min. at 230° C., and (2) about 90 percent, by weight, of at least one polyethylene having a density of about 0.917, a melt index at 190° C. of 13, and a melt index recovery of 70.
Claim 16
Dependent Claim
106 words
An extrusion coating composition having a melt index of 12 dg/min. at 190° C. which provides coatings of less than 1 mil which have heat seal strengths of at least 10 pounds per linear inch comprising a blend of: (1) about 10 percent, by weight, of at least one degraded crystalline polypropylene or ethylene/propylene copolymer containing less than 5 weight percent ethylene, having a melt flow rate of 35 dg/min. at 230° C., and (2) about 90 percent, by weight, of at least one polyethylene having a density of about 0.917, a melt index at 190° C. of 13, and a melt index recovery of 70.
Claim 17
Dependent Claim
18 words
An extrusion coating composition according to claim 1 wherein said degraded crystalline propylene containing copolymer is crystalline polypropylene.
Claim 18
Dependent Claim
23 words
An extrusion coating composition according to claim 2 wherein said degraded crystalline polypropylene has a melt flow rate of 34 at 230° C.
Claim 19
Dependent Claim
34 words
An extrusion coating composition according to claim 2 wherein said low density polyethylene has a melt index of 13 dg/min. at 190° C., a density of 0.917 g/cc, and a 70 melt index recovery.
Claim 20
Dependent Claim
23 words
An extrusion coating composition according to claim 5 wherein said degraded crystalline polypropylene has a melt flow rate of 30 at 230° C.
Claim 21
Dependent Claim
34 words
An extrusion coating composition according to claim 5 wherein said low density polyethylene has a melt index of 13 dg/min. at 190° C., a density of 0.917 g/cc, and a 70 melt index recovery.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-15 | 1986-05-17 | 1986-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-15 | 1990-05-17 | 1990-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-15 | 1994-05-17 | 1994-11-16 | $7700.00 | Window Closed / Lapsed |