Method of preparing polymer coated-wax impregnated cellulosic stock
Abstract
Abstract Porous cellulosic stock can be coated with a thermoplastic polymer coating while being impregnated with a wax by this invention. A dispersion of polymer particles in molten wax is applied to cellulosic stock at a temperature below the melting point of the polymer. This treated cellulosic stock is then heated to a temperature above the melting point of the polymer and subjected to pressure. The resulting laminated product is polymer coated-wax impregnated cellulosic stock. The polymer used must be substantially insoluble in the molten wax at a temperature below the melting point of the polymer and must be fusible below a temperature which would degrade the stock. This product has utility as a packaging material comprising a high water vapor barrier coupled with a tough, scuff-resistant, nonblocking surface.
Inventors
- 👤 I Duling
- 👤 J Merges
Bibliographic Details
Claims Analysis
Total Claims: 8References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |