Dyeing process

Abstract

Abstract 539,673. Dyeing polymerization products. HILL, F., RADLEY, J. A., WOOLER, A. M., and IMPERIAL CHEMICAL INDUSTRIES. Ltd. March 18, 1940, No. 4999. [Classes 2 (iii) and 15 (ii)] Sheets, rods, tubes and other articles of polymerized methyl methacrylate are dyed in strong shades fast to light by applying thereto an aqueous dispersion or solution, containing n-butanol, of one or more of the following dyestuffs, viz., the 1-methylamino-, 1-amino-4-hydroxy- and 1-amino-2-methylderivatives of anthraquinone, 2 : 4-dinitro-4<SP>1</SP>- hydroxydiphenylamine, 2-methoxy-4-nitro-4<SP>1</SP>- diethylaminoazobenzene, the oxazine dyestuff obtained by condensing nitroso-3-diethylaminoanisole (1 mol.) with 3-diethylaminophenol (1 mol.), 2-hydroxy-5-methylazobenzene-4<SP>1</SP>-#- hydroxyethoxy sulphuric acid ester, p-dodecylaniline# 1-(2<SP>1</SP> : 5<SP>1</SP>-dichloro-4<SP>1</SP>-sulpho) phenyl-3- methyl-5-pyrazolone, 2-p-azobenzeneazo-1- naphthol-4-sulphonic acid, 4-o-sulphoanilino- 2<SP>1</SP>-hydroxy-4<SP>1</SP>-methylazobenzene esterified with p-toluenesulphonyl chloride, disulphonated 1 : 5-di-p-toluidinoanthraquinone, the monosulphonated derivatives of 1 : 4-di-p-toluidinoanthraquinone and of 1-amino-2-bromo-4-ptoluidinoanthraquinone, di-(N-p-sulphobenzyl- N - ethyl - p<SP>1</SP> aminophenyl) - phenylcarbinol and 1-amino-2-sulpho-4-anilinoanthraquinone. In examples of the dyeing of sheets of polymerized methyl methacrylate, the sheet is placed (1) for 30 minutes in an aqueous solution at 75‹ C. containing 1-amino-2-sulpho-4-anilinoanthraquinone, sodium oleyl sulphate, sodium sulphate, sodium chloride, acetic acid and n-butanol to obtain a deep blue dyeing, (2) for 20 minutes in an aqueous liquor at 75‹ C. containing 1-methylaminoanthraquinone dispersed with the sodium salt of the condensation product from #-naphthalenesulphonic acid (2 mols.) and formaldehyde (1 mol.), sodium oleyl sulphate, sodium sulphate, sodium chloride and n-butanol to obtain a deep red dyeing; if the dyestuff is replaced by a mixture of the 1-amino-4-hydroxy- and 1-amino-2-methyl-derivatives of anthraquinone, the dyeing is scarlet, (3) for 30 minutes in an aqueous solution at 70‹ C. containing 2-hydroxy-5- methylazobenzene - 4<SP>1</SP> - # - hydroxyethoxy sulphuric acid ester, sodium chloride and n-butanol to obtain a deep yellow dyeing, (4) for 30 minutes in an aqueous solution at 70‹ C. containing the above oxazine dyestuff, sodium chloride and n-butanol to obtain a deep blue dyeing, (5) for 20 minutes in an aqueous solution at 60‹ C. containing di-sulphonated 1 : 5- di-p-toluidinoanthraquinone, 1-amino-2-sulpho- 4-anilinoanthraquinone, 2-hydroxy-5-methylazobenzene-4<SP>1</SP>-#-hydroxyethoxy sulphuric acid ester, sodium oleyl sulphate, sodium chloride, acetic acid, ethyleneglycol monoethyl ether and n-butanol to obtain a neutral grey dyeing, (6) for 30 minutes in an aqueous solution at 75‹ C. containing 1-amino-2-sulpho-4-anilinoanthraquinone, sodium oleyl sulphate, sodium chloride, sodium bisulphite and n-butanol to obtain a deep blue dyeing. Specification 427,194 is referred to.

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