IL33754A

IL33754A - Process for the optical brightening of fibrous materials made from polyacrylonitrile

Info

Publication number: IL33754A
Application number: IL33754A
Authority: IL
Original assignee: Hoechst Ag
Priority date: 1969-01-30
Filing date: 1970-01-21
Publication date: 1973-01-30
Also published as: AT299877B; PL80451B1; YU20970A; DE1904424A1; CH114570A4; YU34723B; ES376024A1; FR2029718A1; NL7000762A; SE364319B; FI48589C; GB1288545A; BE745278A; FI48589B; DE1904424B2; FR2029718B1; IL33754A0; DE1904424C3; BR7016461D0; US3690947A

Description

Process for the optical brightening of fibroua materials ~"' ma from polyacrylonitrile '?·»ηο,*3ΐ,?^ 17Κ'»'7ΤΡΡ ap »a?o nmri 7to IPOBIK npnarft ι»7πη Process for the optical brightening of fibrous materials made from polyacrylonitrile _J (HOE 69/F 02 ) ' · The present invention provides a process for the optical brightening of. fibrous materials made from polyacrylonitrile. _ Prom Belgian Patent No. 670 l6l it is known to use as optical brighteners pyrazoline compounds corresponding to the general formula I in which R stands for an aryl radical that may be substituted, more especially a phenyl radical, preferably p-chlorophenyl, Y stands for an oxygen or sulfur atom and represents an alkyl, aralkyl or phenyl radical, optionally substituted by hydroxy, alkoxy-, Ν,Ν-dialkylamino, quaternary trialkylammonium, carb-oxy or esterified carboxy groups.

. According, to Example 7 of the cited Patent Specification also fibrous materials of polyacrylonitrile may be brightened therewith, However, it appeared that the brightening effect obtainable with the compounds of the said type under the conditions stated in that Patent can still be improved.

Now, it has been found that fibrous materials made from polyacrylonitrile or polymers containing at least 85 of polyacrylonitrile can be optically brightened in a particularly advantageous manner, when they are impregnated with an optical in which A is a lower, optionally branched, alkylene' radical, R1 is a lower alkyl group, R≥ each represent a lower alkyl group which together with the nitrogen atom may form a saturated heterocyclic ring, X stands for a colorless anion and n is 1 or.2, and the impregnated fabric is adjusted to a liquor content of about 5 to 120 , referred to the weight of the good, and heated, subsequently, for about two seconds to about 30 minutes to a temperature from about 100 to about 150°C. The heating is, preferably, achieved, with steam of about 100 to about l 0°C. It may also be advantageous to dry the impregnated fibrous material before heating or, preferably, steaming it. The described treatment is advantageously performed continuously.

The brightening effect achieved in said manner can still be enhanced when a non-ionic nitrogen containing fatty acid oxethylate and/or a quaternary condensation product of a fatty acid is added to the brightening liquor. The additives mentioned provide, when used in conjunction with the above-identified optical brightenersj a degree of whiteness of exceptional brilliance. Moreover, they exert a brightening and softening effect on the fibre which, for example, results in. an essential , , with the optical brightener and, optionally, the said additives, to an intermediary drying at about 50 to about 150°C. The thus dried fabric is, subsequently, printed and then heated in The compounds of formula III show a greenish-blue fluorescence and are thus able, when: applied in mixture with the compounds of formula II, to compensate the reddish tint thereof. They are advantageously added in an amount . of about 0.05 to about by weight, preferably about 0.5 to about 3 by weight, referred to compound II. hydroxy-ethyl-sulfone, subsequent: / transformation of the ls hydroxyethyl group via the sulfuric acid ester into the vinyl-sulfone group and addition thereto, of a correspondingly substituted alcohol.

The concentrations of optical brightener employed in the instant process are within the usual range. They can be easily determined b anyone skilled in the art by simple preliminary tests. As a guide-line the threshold values of about 0.1 to about 50 g of optical brightener /l of impregnation liquor may serve. Advantageously, the concentration of the brightener in the impregnation liquor and the liquor content are adjusted such to yield a concentration of brightener on the good of about O.O5 to about 5 by weight.

The following Examples serve to illustrate the invention. The parts and percentages are by weight unless otherwise stated. E x a m p l e 1 A sliver consisting of at least 85 "of polyacrylonitrile was treated with a bleaching liquor containing as the optical brightener 1 g/l of the compound of formula IV.

The pH of the solution was adjusted to 3 by means of oxalic acid. Furthermore, 1.5 g of a condensation product of stearic acid and of; an addition product of 4 mols of ethylene oxide on ammonia and 1 g/l of a quaternated condensation product of di- sliver was squeezed off between cylinders until its moisture content was about 100 % and treated for three ' minutes with saturated steam of 100°C in an appropriate steamer. The thus brightened fabric showed an excellent degree of whiteness which was substantially superior to that. of the untreated fabric and distinctly higher than obtained by the process des-■ cribed in Example 7 of Belgian Patent Specification No. 670,l6l . E x a m p l e 2 A liquor containing 1.5 g/l of the optical brightener of the fo and 2 g/l of a condensation product of stearic acid and the. addition product of K mols of ethylene oxide on 1 mol of ammonia was sprayed onto a tow containing at least 85 of polyacrylonitrile. The pH of the liquor was adjusted to 3*5 by means of oxalic acid. For the spraying such amount of liquor was employed as was necessary for achieving a moisture content of 100,$. Said fabric was, subsequently} treated for 10 seconds with steam of 104°C. After that treatment,' the tow showed an excellent degree of whiteness.

E x a m p l e 3 · A fabric^ consisting of at least 85 of polyacrylonitrile was impregnated with a liquor containing 2 g/l of an optical CI VI S0„ · CH„ « CI1„ · 0 · CH · C!L · N · CH .

Cll . and 1 g/l of a quaternated condensation product of diethylene-triamine and stearic acid. The pH of the treating liquor' was adjusted to 2 and the liquor, thereupon, thickened by adding g/l of a commercial starch ether. The fabric was squeezed off to a moisture content of 80 ^between rollers and dried for two minutes at l 0°C.

Then it was ptinted in · known manner with disperse dyestuffs and steamed for 20 minutes at 103°C. The mprinted areas of the fabric showed an excellent degree of whiteness.

E x a m p l e 4 A knit fabric consisting of at least 85 of polyacrylo-nitrile was impregnated with a liquor containing 5 g/l of an optical brightener of the formula VII " and 0. I The pH of the solution was adjusted to 2 by means of sulfuric acid Furthermore, 2 g/l of a quaternated condensation product of diethylene triamine and stearic acid were added to the padding liquor. The knit fabric was after its impregnation with the said solution, squeezed off between rollers until its moisture content was about 100 % and treated for > seconds with saturated steam of about 120°C in an appropriate steamer. The thus brightened fabric showed an excellent degree of whiteness, substantially superior to that of the untreated good. )

Claims

HOE 69/ΙΌ2 (Fw 5984) What .we claim is: ·

1. ) A process for the optical "brightening of fibrous materials of polymers containing at least 8 of acrylonitrile , which comprises' impregnating said material with a liquor containing a brightener of the general formula in which A stands for an alkylene group of 2 to 4 carbon atoms, 1 2 R and each stand for ah alkyl group of 1 to 4 carbon atoms 2 or t/o radicals R together with the nitrogen atom form a sat- urated heterocyclic ring, X stands for a colorless anion and n stands for 1 or 2, adjusting the liquor content to 5 to 120$ by .weight, referred to the -good, and heating the -material for 2 seconds to 30 minutes to 100 to 150°C.

2. ) The process as claimed in claim 1 , wherein the concentration of the brightener in the impregnation liquor is 0.1 to 50 g/l.

3. ) The process as claimed in claim 1 and 2, wherein the adjusting of the liquor content is accomodated to . the concentration of the brightener in the impregnation liquor to yield a concentration of the brightener on the good of 0.05 to $ by weight, referred to the good.'.

4. ) The process as claimed in claims 1 to 3, wherein heating is achieved with steam.

5. ) The process as claimed in claims 1 to 4, wherein the impreg- nated material is dried before heating.

6. ). The process as claimed in claims 1 to 5, wherein the treatment is performed continuously.

7. ) The process as claimed in claims 1 to 6, wherein the impregnation liquor is adjusted to a pH of 2 to 4.

8. ) The /process as claimed in claims 1 to 7, wherein the impregnation liquor contains a nonionic condensation product of a fatty acid and oxethylated ammonia.

9. ) The process as claimed in claims 1 to 8, wherein the impregnation liquor contains. quaternary condensation product of a fatty acid and a.', low-molecular aliphatic polyamine.

10. ) The process as claimed in claims 1 to 9, wherein the impregnation liquor contains a thickener for textile printing inks.

11. ) impregla in which A stands for an alkylene group of 2 to 4 carbon atoms, R1 and R2 each stand for an alkyl group of 1 to 4 carbon atoms or two radicals R 2 together with the nitrogen atom form a saturated heterocyclic ring, X stands for a colorless anion and n stands for 1 or 2.

12. ) The process as claimed in claim 11, wherein 0.05 to 10 by weight, referred to the brightener, of said compound is used.

13. ) Any process conducted substantially as described herein j¾r in the Examples . 1 ) 'Fibrous materials of polymers containing at least 85