US4427833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene extrusion coating compositions
Assignee: Eastman Chemical Co
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Filing: 1982-03-19
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Granted: 1984-01-24
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Expires: 2002-03-19
Abstract
Abstract This invention relates to low density polyethylene extrusion coating compositions which provide coatings having good coatability and a broad heat seal range. The coated substrates can be used in fabricating bags and other packaging applications. These unique extrusion coatings are provided by a low density polyethylene having a density of 0.916 to 0.926, a melt index of 0.1 to 2.0 and a swell ratio of less than 1.5.
Inventors
- 👤 Ray Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:31
CPC Classifications
C; C09; C09J; C09J123/00; C09J123/02; C09J123/04; C09J123/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
63 words
An extrusion coating composition capable of providing a coating having a thickness of about 0.0254 mm or less at coating speeds of at least 4 meters per second consisting essentially of a polyethylene component comprising low density polyethylene having a density of 0.916 to 0.926, a melt index at 190° C. of 0.1 to 2.0, and a swell ratio of less than 1.50.
Claim 2
Dependent Claim
63 words
An extrusion coating composition capable of providing a coating having a thickness of about 0.0254 mm or less at coating speeds of at least 4 meters per second consisting essentially of a polyethylene component comprising low density polyethylene having a density of 0.916 to 0.926, a melt index at 190° C. of 0.1 to 2.0, and a swell ratio of less than 1.50.
Claim 3
Dependent Claim
24 words
An extrusion coating composition according to claim 1 wherein said low density polyethylene has a melt index at 190° C. of 1.4 to 1.7.
Claim 4
Dependent Claim
21 words
An extrusion coating composition according to claim 2 wherein said low density polyethylene also has a swell ratio of about 1.4.
Claim 5
Dependent Claim
56 words
An extrusion coating composition capable of providing a thickness of about 0.0254 mm or less at coating speeds of about 7 meters per second consisting essentially of a polyethylene component comprising low density polyethylene having a density of about 0.921, a melt index at 190° C. of about 1.7 and a swell ratio of about 1.42.
Claim 6
Dependent Claim
56 words
An extrusion coating composition capable of providing a thickness of about 0.0254 mm or less at coating speeds of about 7 meters per second consisting essentially of a polyethylene component comprising low density polyethylene having a density of about 0.921, a melt index at 190° C. of about 1.7 and a swell ratio of about 1.42.
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) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |