Products and services. Shreenath Chemicals

OPTICAL WHITENING AGENT

Thu, 15 Dec 2011 13:59:19 +0200

Optical brighteners, optical brightening agents (OBAs), fluorescent brightening agents (FBAs) or fluorescent whitening agents (FWAs) are dyes that absorb light in theultraviolet and violet region (usually 340-370 nm) of the electromagnetic spectrum, and re-emit light in the blue region (typically 420-470 nm). Fluorescent activity is a short term or rapid emission response, unlike phosphorescence, which is a delayed emission. These additives are often used to enhance the appearance of color of fabric and paper, causing a "whitening" effect, making materials look less yellow by increasing the overall amount of blue light reflected.

SOLVANT DYES

Thu, 15 Dec 2011 13:58:31 +0200

A solvent dyeis adyesoluble inorganic solvents. It is usually used as a solution in an organic solvent.[1] Solvent dyes are used to color organic solvents, hydrocarbon fuels, waxes, lubricants, plastics, and other hydrocarbon-based nonpolar materials. Fuel dyes are one use of solvent dyes. Their molecules are typically nonpolar or little polar, and they do not undergo ionization. They are insoluble in water. They form a colloidal solution in solvents.They have poor (basic dyes) to good (metal complex based) light fastness. Solvent dyes are used for gold imitation (and other transparent metallic effects) of metallized polyester films. Also used in marking inks, inkjet inks, glass coloration, and so on. Names of solvent dyes are often generic, of the scheme "solvent ", e.g. Solvent Red 24, Solvent Red 26, Solvent Red 164, Solvent Yellow 124, Solvent Blue 35, etc. Red and yellow solvent dyes are often azo dyes, green and blue ones tend to be anthraquinone dyes

VAT DYES

Thu, 15 Dec 2011 13:57:45 +0200

The process "vat dyeing" refers to dyeing in a bucket or vat. It can be performed whenever a liquid, even shade over the entire garment is desired. Almost any dye can be used, includingfiber reactive dyes, direct dyes, and acid dyes. One alternative to vat dyeing is direct dye application, such as the process used for tie dyeing. "Vat dyes" are a special class of dyes that work with a special chemistry. Cotton, wool, and other fibers can be all dyed with vat dyes. Note that not all vat dyeing is done with vat dyes. Most vat dyes are less suitable than fiber reactive dyes for the home dyers, as they are difficult to work with; they require a reducing agent to solubilize them. The dye is soluble only in its reduced (oxygen-free) form. The fiber is immersed repeatedly in this oxygen-free dyebath, then exposed to the air, whereupon the water-soluble reduced form changes color as oxygen turns it to the water-insoluble form. Indigo is an example of this dye class; it changes from yellow, in the dyebath, to green and then blue as the air hits it.

DISPERSE DYES

Thu, 15 Dec 2011 13:56:45 +0200

Adyeis acoloredsubstance that has anaffinityto thesubstrateto which it is being applied. The dye is generally applied in anaqueous solution, and requires amordantto improve the fastness of the dye on the fiber. Both dyes and pigments appear to be colored because they absorb some wavelengths of light more than others. In contrast with a dye, a pigment generally is insoluble, and has no affinity for the substrate. Some dyes can be precipitated with an inert salt to produce a lake pigment, and based on the salt used they could be aluminum lake, calcium lake or barium lake pigments. Dyed flax fibers have been found in the Republic of Georgia dated back in a prehistoric cave to 36,000 BP.[1][2]Archaeologicalevidence shows that, particularly in India and Phoenicia, dyeing has been widely carried out for over 5000 years. The dyes were obtained from animal, vegetable or mineral origin, with no or very little processing. By far the greatest source of dyes has been from the plant kingdom, notably roots, berries, bark, leaves and wood, but only a few have ever been used on a commercial scale.

REACTIVE DYES

Thu, 15 Dec 2011 13:55:53 +0200

In a reactive dye a chromophore contains a substituent that is activated and allowed to directly react to the surface of the substrate. Reactive dyes have good fastness properties owing to the bonding that occurs during dyeing. Reactive dyes are most commonly used in dyeing of cellulose like cotton or flax, but also wool is dyeable with reactive dyes.

RHODAMINE

Thu, 15 Dec 2011 13:54:19 +0200

Rhodamine is a family of related chemical compounds,fluoronedyes. Examples areRhodamine 6GandRhodamine B. They are used as adyeand as adye lasergain medium.[1][2]They are often used as atracer dyewithin water to determine the rate and direction of flow and transport. Rhodamine dyesfluoresceand can thus be detected easily and inexpensively with instruments calledfluorometers. Rhodamine dyes are used extensively in biotechnology applications such asfluorescence microscopy,flow cytometry,fluorescence correlation spectroscopyandELISA. Rhodamine dyes are generally toxic, and are soluble in water, methanol and ethanol.

RESIST SALT

Thu, 15 Dec 2011 13:53:05 +0200

Synonyms : Meta Nitrobenzene Sulphonic Acid, Sodium Salt Sodium meta Nitrobenzene Sulphonate. Empirical Formula : C6H4NSO5Na CAS no. : 127-68-4 Purity : 96 Minimum Molecular Weight : 225 gm/mol. Appearance : Off-White Powder or Granules Insoluble : < 0.1 % Basis of sale : On as is basis Packing : 25Kgs. / 50Kgs. HDPE woven bags with PE liner Applications : Intermediate for dyes Oxidising agent for electroplating Auxiliary for printing fabrics

METANILIC ACID

Thu, 15 Dec 2011 13:51:56 +0200

We offer for our clients a premier quality metanilic acid, which is vastly used as a optical brightening agent for the longevity of dyes. These are precisely formulated at our vendor's premises and have sulfonic group at position 2. Further, these acids are widely used in the synthesis of sulfa drugs & exporting, owing to sulphonic group at position.