Thermally hardenable compositions
Abstract
Abstract A THERMOSETTING COMPOSITION IS DISCLOSED WHICH IS CAPABLE OF PROVIDING MOLDED PRODUCTS HAVING HIGH HARDNESS AND HIGH SOFTENING POINT WHICH COMPRISES: (A) 25-84.5 PARTS BY WEIGHT OF PETROLEUM-CRACKED PITCH OBTAINED BY SUBJECTING PETROLEUM OR A PETROLEUM PRODUCT TO THERMOCRACKING AT A TEMPERATURE OF 700* C., OR HIGHER AND SEPARATING THE LIGHTER FRACTIONS AND CONSTITUENTS HAVING A LOW DISTILLATION POINT THAN 400*C., FROM THE CRACKED RESIDUAL MIXTURE, (B) 10-40 PARTS BY WEIGHT OF A RUBBER HAVING UNSATURATED DOUBLE BONDS, (C) 5-30 PARTS BY WEIGHT OF SULFUR, AND (D) 0.5-5 PARTS BY WEIGHT OF A VULCANIZATION ACCELERATOR, SAID PITCH HAVING A HYDROGEN TO CARBON ATOMIC RATIO OF LESS THAN 1.0 AND THE TOTAL PARTS BY WEIGHT OF ALL CONSTITUENTS AMOUNTING TO APPROXIMATELY 100.
Inventors
- 👤 S Nishita
- 👤 T Hotta
- 👤 R Takabe
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |