申请人:BASF SE
公开号:US20210025070A1
公开(公告)日:2021-01-28
An aqueous composition comprising (a) metal ions comprising tin ions and silver ions and (b) at least one complexing agent of formula (C1) R
1
—X
1
—S—X
21
[D
1
-X
22
—]
n
—S—X
3
—R
2
, (C2) R
1
—X
1
—S—X
31
-D
2
-[X
32
—S—]
n
X
3
—R
2
, (C3) R
3
—X
1
—S—X
41
-[D
3
—X
42
—]
n
S—X
3
—R
4
wherein X
1
, X
3
are independently selected from a linear or branched C
1
-C
12
alkanediyl, which may be unsubstituted or substituted by OH; X
21
, X
22
are independently selected from X
1
, which may be further substituted by —X
5
—COOR
12
, —X
5
—SO
2
—O—R
12
, a C
2
to C
6
polyoxyalkylene group of formula —(O—CH
2
—CHR
11
)
z
—OH, or a combination thereof, and —X
1
—NH—CO—X
6
—CO—NH—X
1
—; X
31
, X
32
are independently selected from a chemical bond and X
1
; X
41
, X
42
are independently selected from X
1
; X
5
is a linear or branched Ci to C10 alkyl; X
6
is selected from X
1
and a divalent 5 or 6 membered aromatic group; R
1
, R
2
are independently selected from a monovalent 5 or 6 membered aromatic N-heterocyclic group comprising one N atom or two N atoms which are separated by at least one C atom, and its derivatives received by N-alkylation with a C
1
-C
6
-alkyl group, which may be substituted by —COOR
12
or —SO
2
—O—R
12
, and which aromatic N-heterocyclic group may optionally further comprise, under the proviso that X21 is substituted by at least one OH, one S atom; R
3
, R
4
are independently selected from a monovalent 5 or 6 membered aliphatic N-heterocyclic group comprising one N atom and one O atom; D
1
is independently selected from S, O and NR
10−
; D
2
is (a) a divalent 5 or 6 membered aliphatic heterocyclic ring system comprising 1 or 2 S atoms, or (b) a 5 or 6 membered aromatic heterocyclic ring system comprising at least two N atoms and optionally one or two S atoms; D
3
is independently selected from S and NR
10−
; n is an integer of from 0 to 5; z is an integer from 1 to 50; R
10
is selected from H and a linear or branched C
1
-C
12
alkyl; R
11
is selected from H and a linear or branched C
1
to C
6
alkyl; and R
12
is selected from R10 and a cation.