Claims
- 1. A fluoran colour former mixture comprising at least
- (a) a fluoran component of the formula ##STR8## in which R.sub.1 is hydrogen or methyl,
- R.sub.2 is halogen, methyl or ethyl,
- X.sub.1 is C.sub.1 -C.sub.4 -alkyl, cyclohexyl, phenyl or tolyl,
- X.sub.2 is C.sub.1 -C.sub.4 -alkyl, or --NX.sub.1 X.sub.2 is pyrrolidino, and
- X.sub.3 and X.sub.4 are each C.sub.7 -C.sub.9 -phenylalkyl or chlorine- or methyl-ringsubstituted benzyl, and
- (b) a fluoran component of the formula ##STR9## in which R.sub.4 is hydrogen, halogen or methyl,
- Y.sub.1 is C.sub.1 -C.sub.4 -alkyl, cyclohexykl, phenyl or tolyl,
- Y.sub.2 is C.sub.1 -C.sub.4 -alkyl, or
- --NY.sub.1 Y.sub.2 is pyrrolidino, and
- Y.sub.3 and Y.sub.4 are each C.sub.7 -C.sub.9 -phenylalkyl or chlorine- or methyl-ringsubstituted benzyl,
- wherein the weight ratio of (a):(b) is 1:3 to 1:2.
- 2. A colour former mixture according to claim 1, wherein component (a) is 2-dibenzylamino-3-methyl-6-diethylaminofluoran and component (b) is 2-dibenzylamino-6-diethylaminofluoran.
- 3. A colour former mixture according to claim 1 wherein the components (a) and (b) are present in the amorphous state.
- 4. A microencapsulated colour former mixture solution which contains at least one fluoran compound of the formula (1) and one fluoran compound of the formula (2) according to claim 1.
Priority Claims (2)
Number |
Date |
Country |
Kind |
4313/86 |
Oct 1986 |
CHX |
|
158/87 |
Jan 1987 |
CHX |
|
Parent Case Info
This application is a continuation of now abandoned application, Ser. No. 07/113,839 filed on Oct. 26, 1987 now aband.
US Referenced Citations (9)
Foreign Referenced Citations (6)
Number |
Date |
Country |
0098728 |
May 1984 |
EPX |
3300229 |
Jul 1983 |
DEX |
1546851 |
Oct 1968 |
FRX |
2230632 |
Dec 1974 |
FRX |
1297598 |
Apr 1972 |
GBX |
2115943 |
Sep 1983 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Patent Abstract of Japan 7,24 (M-189) 1169 (1983). |
Continuations (1)
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Number |
Date |
Country |
Parent |
113839 |
Oct 1987 |
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