Disclosed herein is a composition comprising: A) a lubricant; and
B) a mixture of antioxidants, wherein said mixture is prepared by the partial condensation of an alkylated diphenylamine with an aldehyde or ketone in the presence of an acidic catalyst to yield at least one acridan of the general formula:
wherein:
R
1
, R
2
, R
3
, and R
4
are independently selected from the group consisting of hydrogen, C
3
to C
32
alkyl, and C
3
to C
32
alkenyl, provided that at least one of R
1
, R
2
, R
3
, and R
4
is not hydrogen, and R
5
and R
6
are independently selected from the group consisting of C
1
to C
20
hydrocarbyl and hydrogen; wherein, at the termination of said condensation, residual alkylated diphenylamine is not separated from the acridan product.
本文公开的组合物包括A) 润滑剂;和
B)
抗氧化剂混合物,其中所述混合物是在酸性催化剂存在下,通过烷基化
二苯胺与醛或酮的部分缩合生成至少一种通式
吖啶而制备的:
其中
R
1
, R
2
, R
3
和 R
4
分别独立地选自氢、C
3
至 C
32
烷基和 C
3
至 C
32
烯基,条件是 R
1
, R
2
, R
3
和 R
4
不是氢,且 R
5
和 R
6
独立选自 C
1
至 C
20
烃基和氢组成的组;其中,在所述缩合结束时,残留的烷基化
二苯胺没有从
吖啶化产物中分离出来。