Claims
- 1. A colored water immiscible organic liquid having dissolved therein a disazo colorant corresponding to the formula ##STR23## in which R.sub.1 is H, CF.sub.3, or alkyl having from 1 to 4 carbon atoms, R.sub.2 is H or alkyl having from 1 to 4 carbon atoms, R.sub.3 and R.sub.4 are each H, OCH.sub.3, OC.sub.2 H.sub.5 or CH.sub.3 and R.sub.5, R.sub.6 and R.sub.7 are each H or alkyl having 1 to 12 carbon atoms, at least one of said R.sub.5, R.sub.6 and R.sub.7 being alkyl, said disazo colorant being highly resistant to removal from said organic liquid by the commonly used adsorbents such as carbon black, charcoal, clay and silica.
- 2. The colored water immiscible organic liquid of Claim 1 wherein R.sub.1 is CF.sub.3, R.sub.2 is H, R.sub.3 is OCH.sub.3, R.sub.4 is CH.sub.3, R.sub.5 is C.sub.7 H.sub.15, R.sub.6 is C.sub.12 H.sub.25, and R.sub.7 is H.
- 3. A colored water immiscible organic liquid having dissolved therein a disazo colorant comprising a mixture of compounds having the formula ##STR24## where R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each H or CH.sub.3, said disazo colorant being highly resistant to removal from said organic liquid by the commonly used adsorbents such as carbon black, charcoal, clay and silica.
Parent Case Info
This is a division of application Ser. No. 313,591, filed Dec. 8, 1972, now U.S. Pat. No. 3,862,120, patented Jan. 21, 1975.
US Referenced Citations (8)
Divisions (1)
|
Number |
Date |
Country |
Parent |
313591 |
Dec 1972 |
|