Polyvinylchloride modified by a graft copolymer of vinyl chloride onto polypentenamer
Abstract
Abstract There are disclosed new, high-impact resistant compositions based on polyvinylchloride and comprising graft copolymers of vinyl monomers and certain rubbery polyalkenamers having a narrow molecular weight distribution. Unexpectedly, the graft copolymers function to improve the mechanical properties, more particularly the impact resistance, of the compositions, as compared to polyvinylchloride, per se. That polyvinylchloride tends to be brittle and to have relatively low impact resistance is well known. In the past, it has been attempted to overcome the brittleness of polyvinylchloride, and its relatively low impact resistance by incorporating various plasticizers with it. A problem has been the tendency of the plasticizers to ''''bleed,'''' a result of a basic incompatibility of the polyvinylchloride and the plasticizers available.
Inventors
- 👤 A Pagliari
- 👤 F Severini
- 👤 A Valvassori
Bibliographic Details
Claims Analysis
Total Claims: 3References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |