Stabilized polyurethane elastomers
Abstract
Abstract POLYURETHANE ELASTOMERS ARE MADE RESISTANT TO DISCOLORATION ON EXPOSURE TO ATMOSPHERIC FUMES AS WELL AS ULTRAVIOLET RADIATION BY THE INCORPORATION OF A SUBSTITUTED PHENOL AND AN ORGANIC PHOSPHITE, TYPICAL SUBSTITUTED PHENOLS HAVE THE FORMULA: (2-(CH3-),4-(HO-),5-R2-PHENYL)2-CH-R1 AND ((3-R3,4-(HO-),5-R4-PHENYL)-(CH2)2-COO-CH2)4-C WHERE R1 IS HYDROGEN OR ALKYL (C1-C8); R2 IS ALKYL (C4-C8); AND R3 AND R4 ARE ALKYL (C1-C8). TYPICAL ORGANIC PHOSPHITES HAVE THE FORMULAS: 3-(R''-X-),9-(R"-X-)-2,4,8,10-TETRAOXA-3,9-DIPHOSPHASPIRO- (5.5)UNDECANE AND -(O-(3,9-2,4,8,10-TETRAOXA-3,9-DIPHOSPHASPIRO(5.5) UNDECANYLENE)-O-Q)X- WHERE R'' AND R" ARE ALKYL (C6-C18); X IS OXYGEN OR SULFUR; Q IS A HYDROGENATED BISPHENOL A RESIDUE; AND X IS SUFFICIENT TO PROVIDE A MOLECULAR WEIGHT OF AT LEAST 1,000.
Inventors
- 👤 Ignazio Salvatore Megna
- 👤 Frank Aloysius Vincen Sullivan
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |