Optical Brighteners

Brighteners, Optical


(also optical bleaches), colorless or slightly colored organic compounds that absorb ultraviolet rays of wavelengths between 300 and 400 millimicrons (mμ). They subsequently convert the ultraviolet rays into blue or violet light in the 400–500 mμ range, which compensates for an insufficiency of blue rays in the light that is reflected from the brightened material. Optical brighteners are used with many materials, including cotton, synthetic fibers, paper, wool, raw silk, leather, fur, and plastics. This process imparts a high degree of brightness to colorless materials and brightness and contrast to colored articles.

Most of the optical brighteners that are used with cellulose materials are stilbene-triazine derivatives of the general structural formula

where Rʹ and Rʺ are such groupings as NHR, NR2, NHC2H4-OH, N(C2H4OH)2, NHAr, OCH3, NHC6H4SO3Na, NH2, and OH (R being any alkyl radical and Ar being any aryl radical).

Optical brighteners are used during various stages in the preparation and processing of natural and synthetic materials. Optical brightening and dyeing are similar processes, especially the brightening and direct dyeing of cellulose materials. However, considerably less optical brightener than dye is needed to produce the desired effect. Optical brighteners that are insoluble in water may be used either in highly dispersed form or in solution with organic solvents.

References in periodicals archive ?
Simultaneously measure M0, M1 and M2 in a single pass to account for optical brighteners so photographers can quickly predict how colors printed on optically brightened substrates will look under different lighting conditions.
In response to high demand, BASF invested in an extension of the manufacturing facility for optical brighteners in Monthey as recently as 2017.
A: Detergent bar is still the most economical way to wash your clothes, so to drive innovation in the category, Wellmade launched the first 2-in-1 fabric conditioner bar (pink side) and whitening bar with optical brighteners (white) on the other side.
[USPRwire, Mon Apr 22 2019] A new report titled " Optical Brighteners Market Key Insights and Booming Factor Supporting Growth till 2026 " has been included in the enormous research repository of Market Research Reports Search Engine (MRRSE) that compiles various facets of the Optical Brighteners market at a global level portraying a holistic analysis of the marketplace along with intelligence on key participants.
Green cleaning Don't use harsh cleaning products, and avoid artificial fragrance, parabens, chlorine, optical brighteners, phthalates, triclosan and SLS (sodium lauryl sulphate), said green guru Janey Lee Grace (imperfectlynatural.com).
Avoid harsh cleaning products and steer clear of artificial fragrance, parabens, chlorine, optical brighteners, phthalates, triclosan and SLS (sodium lauryl sulphate), says green guru Janey Lee Grace (imperfectly natural.com).
The cleansers and softeners are vegan, not tested on animals and dermatologist tested, and free of dyes, optical brighteners, gluten added parabens and alcohol.
| Neutral 0% is a premium range of laundry detergents designed for people with allergies and sensitive skin, with 0% perfumes, 0% colourants and 0% optical brighteners. Visit neutralsensitiveskin.com
Standard Cyclops sensors are available for detecting: in vivo Chlorophyll, Crude Oil, Refined Fuels, CDOM/FDOM (dissolved organic material), Blue/Green Algae, Fluorescein Dye, Rhodamine Dye, PTSA Dye, Optical Brighteners, Tryptophan, and Turbidity.
Dreft purtouch has a formula that is free of dyes, chlorine, phosphates, ethanolamine and optical brighteners, and is made with 100-percent renewable wind power electricity at a zero manufacturing waste to landfill site.