Collagen matrix waterproofing with chromium complexes containing radicals of long chain hydrocarbons and fluorinated hydrocarbons and product so produced
Abstract
Abstract A PROCESS FOR IMPROVING THE DYNAMIC WATER RESISTANCE OF A POROUS COLLAGEN FIBER MATRIX TREATED WITH A CHROMIUM COMPLEX CAPABLE OF IMPARTING WATER REPELLENCY THERETO WHICH COMPRISES TREATING SAID MATRIX AFTER TANNING AND WHILE WATER WETTED WITH AN AQUEOUS FLOAT LIQUOR CONTAINING A LOW MOLECULAR WEIGHT URETHANE ADDUCT OF AN ORGANIC ISOCYANATE AND AN ALCOHOL, SAID ADDUCT HAVING A MELTING POINT BELOW ABOUT 200*C., A MOLECULAR WEIGHT BELOW ABOUT 10,000, AND AT LEAST 0.5 URETHANE GROUPS PER 1000 MOLECULAR WEIGHT OF ADDUCT, THE WEIGHT RATIO OF SAID URETHANE ADDUCT TO SAID CHROMIUM COMPLEX BEING FROM 1/9 TO 9/1 AND THE COMBINED WEIGHT OF SAID URETHANE ADDUCT AND SAID CHROMIUM COMPLEX BEING FROM 1.5 TO 5 PERCENT BASED ON THE DRY WEIGHT OF SAID COLLAGEN FIBER.
Inventors
- 👤 Peter D Detomaso
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |