| US 7,608,568 B2 | ||
| Tetraaromatic diamine compounds as antioxidants | ||
| Qinggao Ma, Naugatuck, Conn. (US) | ||
| Assigned to Chemtura Corporation, Middlebury, Conn. (US) | ||
| Filed on Feb. 13, 2007, as Appl. No. 11/706,116. | ||
| Claims priority of provisional application 60/802975, filed on May 24, 2006. | ||
| Prior Publication US 2007/0272894 A1, Nov. 29, 2007 | ||
| Int. Cl. C10L 1/22 (2006.01); C10M 133/00 (2006.01) | ||
| U.S. Cl. 508—546 [508/549] | 22 Claims |
1. A tetraaromatic diamine compound having the general formula:
 b, c and d independently are integers from 0-5,
R1 and R2 together with the carbon atoms to which they are bonded are joined together to form a saturated or partially saturated C3 to about C30 ring,
R3, R4, R5 and R6 are independently hydrogen, a straight or branched C1-C30 alkyl or alkylene group optionally substituted with one or more substituents, a substituted or unsubstituted C3-C12 cycloalkyl, a substituted or unsubstituted C5-C25 aryl, a substituted or unsubstituted C6-C25 arylalkyl, a straight or branched C1-C30 alkoxy group optionally substituted with one or more substituents.
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