High-modulus polycarbonate compositions
Abstract
Abstract This application discloses improved thermoplastic compositions particularly polycarbonates or polyesters prepared from aromatic dihydroxy compounds, which compositions have been modified with certain stiffening agents, which increase, for example, modulus, tensile strength and hardness, while lowering elongation. The stiffening agents are polar compounds which contain at least one atom selected from the group consisting of halogen, oxygen, nitrogen, and sulfur and wherein said polar compound contains at least two nonbridged rings, each ring containing from four to eight atoms, and wherein said rings are either carbocyclic rings or heterocyclic rings, and wherein said polar compound has in at least 65 percent of the length of its molecule one dimension less than about 5.5 Angstrom units, and wherein said polar compound has a glass transition temperature greater than -50* C.
Inventors
- 👤 John R Caldwell
- 👤 Winston J Jackson Jr
Bibliographic Details
Claims Analysis
Total Claims: 11References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
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