Ethylene copolymer blend for liquid packaging film
Abstract
Abstract A PLASTIC FILM HAVING AN IMPROVED MELT STRENGTH THAT ASSISTS IN EFFECTING RELIABLE HEAT SEALS, PARTICULARLY WHEN THE FILM IS USED IN A MAKE-AND-FILL PROCESS FOR PACKAGING LIQUIDS, SUCH AS MILK. THE FILM IS PREPARED FROM A BLEND OF (A) 90-50 WEIGHT PERCENT OF A RANDOM COPOLYMER OF ETHYLENE AND AN OLEFINIC UNSATURATED MONOMER WHEREIN THE OLEFINIC UNSATURATED MONOMER IS PRESENT IN THE AMOUNT OF ABOUT 2-10 WEIGHT PERCENT OF THE COPOLYMER AND THE COPOLYMER HAS A MELT INDEX OF ABOUT .2 TO 1.0 AND A MELTING POINT OF 95-110*C., AND (B) 10-50 WEIGHT PERCENT OF A LINEAR COPOLYMER OF ETHYLENE AND A OLEFINIC UNSATURATED MONOMER SAID LINEAR COPOLYMER HAVING A DENSITY OF ABOUT .93 TO .96 AND A MELT INDEX OF ABOUT .3 TO 2.5. OPTIONALLY, THIS FILM CAN BE COATED WITH A VINYLIDENE CHLORIDE COPOLYMER COMPOSITION OR LAMINATE TO OTHER FILMS FORMING A COMPOSITE FILM STRUCTURE.
Inventors
- 👤 Arthur Wray Britton
- 👤 George Wilson Luckey
- 👤 Glenn William Mansell
- 👤 John Douglas Snyder
Bibliographic Details
Claims Analysis
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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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |