Claims
- 1. A method for the fluorescent whitening of cotton in a discontinuous process comprising contacting the cotton, in an aqueous acidic bath, with one or more compounds having the formula ##STR20## in which M is hydrogen, sodium, potassium, calcium, magnesium, ammonium, mono-, di-, tri- or tetra-C.sub.1 -C.sub.4 alkylammonium, mono-, di- or tri-C.sub.1 -C.sub.4 hydroxyalkylammonium or ammonium that is di- or tri-substituted by a mixture of C.sub.1 -C.sub.4 alkyl and C.sub.1 -C.sub.4 hydroxyalkyl groups; R.sub.1 is a group having the formula: ##STR21## in which M has its previous significance and n is 1 or 2; and R.sub.2 is O--C.sub.1 -C.sub.12 alkyl or N(R.sub.3)(R.sub.4) in which R.sub.3 and R.sub.4, independently, are hydrogen, C.sub.1 -C.sub.12 alkyl or C.sub.1 -C.sub.4 hydroxyalkyl, or R.sub.3 and R.sub.4, together with the nitrogen atom, form a pyrrolidine, piperidine or morpholine group.
- 2. A method according to claim 1 in which the aqueous bath has a pH value of 6 or less.
- 3. A method according to claim 2 in which the aqueous bath has a pH value in the range of from4to 6.
- 4. A method according to claim 1 in which the compound of formula (1) is used together with a minor proportion of one or more adjuvants selected from emulsifiers, perfumes, colouring dyes, opacifiers, bactericides, nonionic surfactants, anti-gelling agents and corrosion inhibitors.
- 5. A method according to claim 1 which is conducted in the temperature range of from 20.degree.to 140.degree. C.
- 6. A method according to claim 1 which is conducted using an exhaust or foulard technique.
- 7. A method according to claim 1 which is combined with a textile treatment or finishing method.
- 8. A method according to claim 1 in which the compound of formula (1) is used in admixture with a minor amount of an assistant or extender.
- 9. A method according to claim 8 in which the assistant or extender is anhydrous sodium sulfate, sodium sulfate decahydrate, sodium chloride, sodium carbonate, an alkali metal phosphate or an alkali metal silicate such as sodium silicate.
- 10. A method according to claim 9 in which the alkali metal phosphate is sodium or potassium orthophosphate, sodium or potassium pyrophosphate or sodium or potassium tripolyphosphate.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9418958 |
Sep 1994 |
GBX |
|
Parent Case Info
This is a divisional of application Ser. No. 08/530,975 filed on Sep. 20, 1995 now U.S. Pat. No. 5,656,760.
US Referenced Citations (3)
Divisions (1)
|
Number |
Date |
Country |
Parent |
530975 |
Sep 1995 |
|