US4438176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic coated films with anti-static properties
Assignee: Mobil Oil AS
•
Filing: 1983-01-12
•
Granted: 1984-03-20
•
Expires: 2003-01-12
Abstract
Abstract The present invention relates to thermoplastic films such as polypropylene and more particularly to bi-axially oriented polypropylene which are characterized by having excellent anti-static properties and good resistance to the transmission of oxygen and moisture vapor. These properties are achieved by the application of a thin primer layer containing poly (ethylenimine) to corona discharge treated oriented polypropylene film followed by the application of an aqueous dispersion of a vinylidene chloride multipolymer containing a water soluble polyol such as a low molecular weight glycol or a poly (ethylene oxide) adduct of a nonpolar molecule.
Inventors
- 👤 Robert H. Steiner
- 👤 Robert E. Touhsaent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:53
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/042; C09; C09D; C09D127/00; C09D127/02; C09D127/04; C09D127/08; C08J7/043; C08J7/044; C08J7/048; C08J7/052; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12; C08J2427/00; C08J2427/02; C08J2427/04; C08J2427/08; C08J2479/00; C08J2479/04; Y; Y10; Y10S; Y10S260/00; Y10S260/15; Y10S260/21; Y10S428/00; Y10S428/922; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
68 words
A multi-layer thermoplastic film of improved anti-static characteristics consisting essentially of a film substrate consisting essentially of polypropylene having coated on at least one surface thereof a primer coating consisting essentially of poly(ethylene-imine), said primer coating having a topcoating thereon comprising a vinylidene chloride polymer in admixture with an anti-static proportion of a low molecular weight glycol, said vinylidene chloride top coating retaining its inherent heat seal characteristics.
Claim 2
Dependent Claim
68 words
A multi-layer thermoplastic film of improved anti-static characteristics consisting essentially of a film substrate consisting essentially of polypropylene having coated on at least one surface thereof a primer coating consisting essentially of poly(ethylene-imine), said primer coating having a topcoating thereon comprising a vinylidene chloride polymer in admixture with an anti-static proportion of a low molecular weight glycol, said vinylidene chloride top coating retaining its inherent heat seal characteristics.
Claim 3
Dependent Claim
14 words
The film of claim 1 wherein said low molecular weight glycol is propylene glycol.
References Cited (Backward Citations)
US2702257A
Cited
US2772172A
Cited
US2828237A
Cited
US3033707A
Cited
US4048428A
Cited
US3230135A
Cited
US3570748A
Cited
US3652713A
Cited
US3926551A
Cited
US4115334A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |