Translation of "Brightening agent" in German

The flourescent brightening agent used is the Na salt of distyrylbiphenyldisulfonic acid.

A particularly preferred example of such a brightening agent is vanillin.

In addition, polyether is preferably additionally employed as brightening agent and methanesulfonic acid and its salts as leveling agent.

The amount of the novel fluorescent brightening agent to be used according to the invention, based on the weight of the material to be subjected to fluorescent brightening, can vary within wide limits.

The invention eliminates yellowing by pre-treating said silk fabrics with a liquid or solid impregnating agent, dissolved or dispersed in water, then drying the fabric, and adding before, during or after the pre-treating an optical brightening agent of the type normally used for polyester.

Polyester fabric is padded at room temperature with an aqueous dispersion which contains, per liter, 0.5 g of a fluorescent brightening agent consisting of 91.2% of the compound of the formula (3) and 7.7% of the compound of the formula (4) and also 1 g of an adduct of about 8 mols of ethylene oxide and 1 mol of p-tert.-octylphenol.

EXAMPLE 5 Washing agents A', B' and C' are prepared in accordance with Example 3, except that 0.1 g of a fluorescent brightening agent is added to each of the three washing agents.

The opaque polyvinyl chloride film thus obtained has a substantially higher whiteness than a film which does not contain the fluorescent brightening agent.

Instead the complex heteropoly acid solution was divided into two parts and used to precipitate individual solutions of the primary cationic dye and the brightening agent.

Optical Brightening agent FB-351 is packed per 25kg in cardboard box or drum after being packed in plastic bag first.

Preferably, the at least one brightening agent is dissolved in at least one substance in the substantially water-insoluble phase C) or in the entire phase C).

A particularly preferred dye system is a fluorescent mixture of an azomethine or a napthalimide, in each case with a brightening agent based on coumarin or stilbene.

The process of claim 1, wherein the brightening agent is employed in the form of an aqueous emulsion.

Optical Brightening agent DMS is packed per 25kg in cardboard box or drum after being packed in plastic bag first.

Optical Brightening agent CXT is packed per 25kg in cardboard box or drum after being packed in plastic bag first.

In certain cases, the fluorescent brightening agents are made fully effective by an after-treatment.

The sizing agents are also advantageously compatible with fluorescent brightening agents.

The distyrylbenzenes are fluorescent brightening agents for organic materials.

The distyrylbiphenyls are fluorescent brightening agents for organic materials.

Furthermore, the developer baths can contain a conventional antifogging agent, complexing agents, wetting agents, optical brightening agents and others.

Mononitrotoluenes are important intermediates for preparing optical brighteners, plant protection agents, and pharmaceutical products.

Mononitrotoluenes are important intermediates for preparing optical brighteners, crop protection agents and pharmaceutical products.

Fluoric chromes, fiuogenes, phosphors and optical brightening agents can also be used as fluorescence colorants.

The development baths can also contain customary antifogging agents, complexing agents, wetting agents, fluorescent brightening agents and the like.

Antioxidants, lubricating agents, antistatic agents, optical brighteners, coloring agents and separating agents are conventionally used and added as auxiliary materials.

Examples of such compounds are grain-refining agents, wetting agents, brighteners, complexing agents and inhibitors.

All organic compounds, decomposition products and also the acting brighteners and wetting agents are oxidized.

The electrolyte preferably further comprises brighteners, levelling agents and wetting agents as organic additives.

According to these Patent Specifications, asymmetrically substituted fluorescent brightening agents of this type hitherto had to be prepared by a co-condensation reaction, in which a bis-phosphonium compound was reacted with a mixture of two different aldehydes.

Surprisingly, it is now possible with the aid of a novel process, in which the compounds, according to the invention, of the formula (1) are formed as intermediates and which is also a subject of the invention, to synthesise the said asymmetrically substituted fluorescent brightening agents selectively and without the formation of symmetrical by-products, and thus in good yields.

If, in formula (22), the biphenylene radical is replaced by a phenylene radical, this results in fluorescent brightening agents of the formula (21) which contain a phenylene radical in place of the biphenylene radical and which are also preferred.

According to these Patent Specifications, asymmetrically substituted fluorescent brightening agents of this type hitherto had to be prepared by a co-condensaton reaction, in which a bis-phosphonium compound was reacted with a mixture of two different aldehydes.

In addition, the dispersion or solution can contain auxiliaries, such as dispersing agents, for example condensation products of fatty alcohols or alkylphenols having 10 to 18 carbon atoms, which contain 15 to 25 moles of ethylene oxide, or condensation products of alkylmonoamines or polyamines having 16 to 18 carbon atoms, which contain at least 10 moles of ethylene oxide, organic acids, such as formic acid, oxalic acid or acetic acid, detergents, swelling agents, such as dichlorobenzenes or trichlorobenzenes, wetting agents, such as sulfosuccinic acid alkyl esters, bleaching agents, such as sodium chlorite, peroxides or hydrosulfites, and also, if appropriate, brightening agents of the same or other classes, such as, for example, stilbene derivatives having an affinity for cellulose.